Turbo Batch Image Converter Pro

The "From" dropdown groups these into 22 input format families (for example JPEG covers both .jpg and .jpeg, HEIC covers .heic and .heif, and TIFF covers .tif and .tiff). Selecting the RAW family unlocks all 47 camera formats listed below.

Turbo Batch Image Converter Pro reads RAW files from every major camera brand and demosaics them into full-color images before saving to your chosen output format — no separate RAW editor required. This covers common types like CR2, CR3, NEF, ARW and DNG alongside less common professional and cinema formats.

The app opens on a single window split into two panels. The left panel holds every setting that controls how files are converted — scan mode, input and output format, resizing, delete-original, and the thread count. The right panel controls what gets converted — the Batch/Individual toggle, the source folder or file, the live progress dashboard, and the action buttons. You set the options on the left, point the app at your files on the right, and press Convert. There is no project setup, no queue file to save, and no account to create.

Batch Mode Workflow

Individual Mode Workflow

Flip the prominent toggle in the top-right of the app from BATCH MODE to INDIVIDUAL MODE when you only need to convert one file. In this mode the "From" selector is disabled because the input format is detected automatically from the file you choose. Select a single image by browsing to it, pick your output format, set any resize or quality options, and click Convert. It's the fastest path for a one-off conversion — no folder scanning, no queue, just one file in and one file out. Because single-file work completes almost instantly, the Pause and Cancel buttons are disabled in this mode.

A dedicated Settings window gives each output format its own quality or compression control, so you are never forced into a single global quality slider. Set your preferences once and they apply to every file in the batch. The controls below are exactly what the app exposes.

Resizing runs in the same pass as conversion — there is no separate step. Enable Resize, type a target width and height (each up to 8,000 px), and choose one of three modes. High-quality Lanczos resampling is used throughout for crisp results, and an overall ceiling of 64 megapixels protects memory on extreme dimensions.

Getting a picture into a new container is only half the job. What happens to the embedded camera data, and how the resulting files are named, matters just as much when you are moving thousands of items at once.

With twenty-one destination types on offer, the practical question is which one fits the job. Here is a plain-language guide to the ones people reach for most, based on what each is genuinely good at.

Choosing an output format is the single decision that most affects your file sizes, your image quality, and whether the results open cleanly on the other end. The sections below explain what actually separates these formats, so the choice you make in the To dropdown is a deliberate one rather than a guess.

Lossy and Lossless: The Fundamental Split

Every format in the app falls into one of two families. Lossless formats — PNG, TIFF with LZW or ZIP, BMP, TGA, and the Netpbm family — reconstruct the original pixels exactly. Nothing is discarded, so you can convert between them repeatedly without any accumulated degradation. The trade-off is size: a lossless photograph is routinely five to ten times larger than a lossy version that most people cannot visually distinguish from it.

Lossy formats — JPEG, WebP at default settings, AVIF, and HEIC — achieve their compression by discarding image information the human eye is least sensitive to. The saving is dramatic, but the loss is permanent. This matters most when you re-encode: converting a JPEG to another JPEG applies a second round of loss on top of the first. Where you expect a file to be edited and re-saved several times, keep the working copy lossless and produce the lossy version only as the final export.

Two formats sit in both camps. WebP has a dedicated Lossless checkbox in the Settings window, and JPEG 2000 becomes fully lossless when you set its quality slider to zero. Both are useful when you want modern compression without committing to permanent loss.

Transparency and Color Depth

If any part of your image needs to be see-through, the format must carry an alpha channel. PNG, WebP, AVIF, TIFF, ICO, TGA, DDS and PSD all do. JPEG does not, and this is the most common surprise in bulk conversion work: convert a folder of transparent PNG logos to JPEG and every transparent region will be filled with a solid background. Nothing is broken, but the result is rarely what was intended. When transparency matters, target PNG for maximum compatibility or WebP when file size is also a concern.

Color depth is the second constraint. Most everyday formats store eight bits per channel, giving 256 levels of red, green and blue. GIF goes further down, holding a palette of at most 256 total colors — which is why the GIF Max Colors setting exists, and why photographic content converted to GIF can show visible banding. At the opposite end, EXR and HDR store floating-point values well beyond the 0–255 range, preserving highlight and shadow detail that an eight-bit format would clip away permanently.

The Modern Formats: WebP, AVIF and HEIC

These three represent the current generation of image compression, and all three are supported as both input and output. WebP is the safe modern choice: it typically produces files 25–35% smaller than an equivalent-quality JPEG, and it is supported by every current browser. For a website migration, WebP is usually the right target because compatibility is no longer a practical concern.

AVIF compresses harder still, often beating WebP by a further 20% at matched visual quality, and it handles gradients and flat color noticeably better. The cost is encoding time: AVIF is computationally expensive, which is why a large AVIF batch takes meaningfully longer than the same batch targeted at WebP. Where you are converting an asset library once and serving it many times, that one-off cost is usually worth paying.

HEIC is the format Apple devices produce by default, and it is where most iPhone photo libraries now live. As an output format it is efficient and high quality, with the quality slider defaulting to 90 rather than 80 because HEIC's multi-pass HEVC encoding rewards the extra headroom. As an input format it is what most users of this app reach for first, because HEIC files still do not open reliably across older Windows software, Android devices, or many web upload forms.

RAW Is Not an Image Format

This distinction trips up a lot of people, and it explains why RAW conversion behaves differently from everything else in the app. A RAW file is not a picture — it is an unprocessed dump of what the camera's sensor recorded, stored in a manufacturer-specific container. Before it can become a viewable image, the sensor data must be demosaiced: an algorithm reconstructs full color for every pixel from a sensor grid where each photosite recorded only one color channel.

That reconstruction is expensive, and it is the reason a RAW batch runs slower than a JPEG batch of the same file count. It is also why the app supports 47 separate RAW formats rather than one: CR2, CR3, NEF, ARW, DNG, RAF, ORF, RW2 and the rest are genuinely different container designs from different manufacturers, each needing its own handling. Selecting the RAW family in the From dropdown unlocks all 47 at once, so a folder containing files from several different camera bodies converts in one pass.

Specialist and Archival Formats

TIFF remains the archival standard for scanned documents and print handoff, with four compression choices exposed in Settings. LZW and ZIP are both lossless and interchangeable in practice; ZIP tends to win on photographic content while LZW is more widely supported by older software. JPEG compression inside a TIFF container shrinks files considerably at the cost of the lossless guarantee, and None produces very large but maximally compatible files.

PSD, TGA and DDS serve design and game pipelines. TGA is a straightforward uncompressed format with an optional Run-Length Encoding pass that shrinks flat-color artwork without any quality loss, which makes it a good fit for sprite sheets and UI elements. DDS is the texture container real-time engines expect. ICO is a special case: rather than storing one image, the app builds a proper multi-resolution pyramid packing 256, 128, 64, 48, 32 and 16-pixel versions into a single file, capped so it never upscales beyond your source dimensions.

The Netpbm family — PPM, PGM and PBM — alongside legacy WBMP and PCX, exists for scientific tooling, embedded systems and programming contexts where a trivially parseable file matters more than efficiency. They are rarely a first choice, but when a downstream tool demands one, having it in the same batch pipeline as everything else saves a conversion detour.

The Settings window exposes a separate control for each output format rather than one global slider, which means the defaults are sensible but rarely optimal for a specific job. Understanding what the numbers represent takes the guesswork out of tuning them.

What the JPEG Quality Number Actually Means

The JPEG slider runs from 1 to 100 and defaults to 80. It is not a percentage of retained quality — it is an index into the encoder's quantization tables, and the relationship between the number and the resulting file size is steeply non-linear. Moving from 80 to 90 can add 60% to file size for a difference most viewers will never notice on a screen. Moving from 80 down to 60 often halves the file size while remaining perfectly acceptable for web thumbnails and email attachments.

In practice, three settings cover almost everything. Use 90–95 for print work, client deliverables and archival exports where the file will not be re-encoded. Use 75–85 for general web and sharing use, which is where the default of 80 sits. Use 55–70 for thumbnails, previews and contact sheets where size dominates. Values above 95 rarely justify their size, and values below 45 begin showing visible blocking artifacts around high-contrast edges.

PNG Compression Is a Time Dial, Not a Quality Dial

The PNG slider runs from 0 to 9 and defaults to 3. This is the single most misread control in any image tool, so it is worth being explicit: PNG output is lossless at every level. A level 0 PNG and a level 9 PNG contain identical pixels. The slider trades encoding time for file size, nothing else. Level 9 typically produces files only 5–15% smaller than level 3 while taking substantially longer per file — a trade that matters a great deal when you are processing fifty thousand images. The default of 3 is deliberately chosen as the point where the curve flattens.

Setting Quality for the Modern Formats

WebP and AVIF both default to 80, and both behave more forgivingly than JPEG at the low end — a WebP at quality 60 generally looks better than a JPEG at quality 60, because the underlying compression handles fine detail more gracefully. If you are migrating a website and want an aggressive size reduction, WebP at 70–75 is a defensible starting point that would look noticeably worse in JPEG.

HEIC defaults to 90 for a reason worth understanding. Its multi-pass HEVC encoding is efficient enough that even at 90 the files remain compact, so there is little to gain by lowering it and real quality to lose. JPEG 2000 inverts the usual convention entirely: setting its slider to 0 produces fully lossless output, while values from 1 to 100 apply increasing lossy compression. Reading that control as "higher is better" produces exactly the opposite of what you intended.

Settings Apply to the Whole Batch

Whatever you configure in the Settings window applies uniformly to every file in the run. This is a deliberate design choice — consistency across a batch is almost always what you want, and it is what makes the results predictable. If a single job genuinely needs two different quality levels, the practical approach is to run it twice against different output folders rather than trying to vary settings mid-run.

Freeing an iPhone Photo Dump

A folder full of HEIC snaps from a phone will not open everywhere. Point the tool at that folder, choose JPG as the destination, set quality to taste, and run it. Thousands of pictures come out in a universally readable form, with shooting metadata intact, ready to hand off or upload. It is the simplest way to convert images to JPG format straight from an iPhone export folder.

Delivering a Camera Shoot

A card of NEF or CR3 captures needs to become client-ready proofs. Select the RAW family as the source, JPG as the target, optionally cap the long edge with Fit resizing, and let the multi-core engine work through the demosaic-and-encode pipeline. A visible caution appears for the heaviest pairings so you can plan the run.

Modernizing a Website's Assets

Legacy PNGs and JPGs weigh a site down. Sweep an assets tree, target WebP or AVIF, and mirror the sub-folder layout into a fresh output directory. You get lighter, faster-loading pictures without disturbing the originals, and the folder structure lines up for a clean deploy.

Producing Icons and Textures

A single source graphic can become a multi-resolution ICO for an application, or a DDS texture for a game engine, in one pass. Because sizing is capped to the source, you never upscale beyond what the artwork actually contains.

A Minimize To Tray button tucks the app into the Windows system tray so a long batch can keep running quietly in the background while you work on other things. The tray icon lets you restore the window or quit the app, keeping large overnight or multi-hour conversions out of your way without interrupting them. Combined with Pause and Resume, this makes it easy to fit big jobs around the rest of your day.

• Safe Multi-Threaded Architecture - Designed for concurrent processing. Each file task runs independently, preventing conflicts during high-speed batch operations.
• File Integrity Protection - Prevents output corruption during simultaneous multi-file conversions.
• Safe Delete to Recycle Bin - Original files are moved to the Recycle Bin rather than permanently deleted (optional).
• Conversion Continuity - A single failed file does not stop the entire batch. Skipped files are reported in the dashboard.
• Pause / Resume Safety - Jobs can be paused and resumed at any point without restarting the entire queue.
• Stable Under Heavy Loads - Continues operating reliably during extended high-volume sessions without performance degradation.
• Ideal for Sensitive Environments - Corporate offices, legal firms, medical records teams, and air-gapped networks.
• Privacy First - No image uploads · No remote scanning · No cloud transfer · No third-party access.

Short walkthroughs recorded on a standard Windows desktop, showing the interface and a full batch run at real speed rather than a sped-up capture.

The Threads slider runs from 1 to 128 and defaults to your CPU's core count. For most users that default is the right answer and needs no attention. The guidance below is for the cases where it is worth overriding — very large jobs, very heavy format pairings, or a machine you need to keep usable while a batch runs.

Your hardware	Suggested setting	Why
Dual-core laptop	2 to 4 workers	Beyond a small multiple of your core count, workers compete for the same CPU time and total throughput stops improving.
4 to 8 core desktop	Auto-Scale, or core count	The default is well matched here. This is the configuration most users have, and it needs no tuning.
12 to 32 core workstation	Core count, up to 2× for light formats	Light pairings such as JPEG to PNG spend time waiting on disk, so extra workers keep the CPU fed.
Any machine, RAW input	Core count or lower	Demosaicing is CPU-bound and memory-hungry. More workers means more full-resolution images held in RAM at once.
Any machine, still in use	Half your core count	Leaves headroom so the rest of Windows stays responsive while the batch runs in the background.

Why More Workers Is Not Always Faster

Conversion throughput is limited by whichever resource saturates first, and that is not always the CPU. On a fast NVMe drive with light format pairings, the processor is the bottleneck and raising the worker count helps. On a mechanical drive, or across a network share, the storage saturates long before the CPU does — and adding workers at that point simply produces more competing read requests, which on a spinning disk can make the run measurably slower rather than faster.

Memory is the other ceiling. Each active worker holds a decoded, full-resolution image in RAM while it works. Forty-megapixel RAW files decode to several hundred megabytes each, so a high worker count on a memory-constrained machine can push the system into swapping, which costs far more time than the parallelism gains. This is precisely why the app automatically reduces the effective worker count for RAW to HEIC and RAW to AVIF, where both the decode and the encode side are simultaneously expensive.

Reading the Dashboard to Find Your Ceiling

The live dashboard refreshes roughly four times a second and reports conversion speed in files per second. That figure is the practical tool for tuning: run a few hundred files at your core count, note the steady-state speed, then try again with the slider raised. If the speed does not improve, you have found the ceiling for that combination of hardware, source format and target format, and further increases only add memory pressure. Because the setting is per-run rather than permanent, experimenting costs nothing.

Turbo Batch Image Converter Pro is a fully local desktop application. All image conversion, resizing, and compression tasks are completed on your own computer. No files are uploaded, scanned remotely, or shared with third parties. It is a trusted offline image converter for personal, commercial, and enterprise use.

• Does not log, analyze, track, or store your image data
• No integration with third-party analytics, advertising trackers, or background telemetry
• Internet is used only for license validation — the request contains no personal data, file names, or image content
• Ideal for photographers, businesses, designers, medical institutions, and enterprise teams
• Complete confidentiality for personal, professional, and commercial workflows

Operating System	Windows 10 (64-bit)
Processor	Dual-core 64-bit CPU
Memory	2 GB RAM
Storage	500 MB free disk space

Operating System	Windows 10 or later (64-bit)
Processor	4 or more CPU cores
Memory	8 GB RAM or more
Storage Type	SSD recommended for best batch performance
Free Disk Space	2 GB or more

App Name	Turbo Batch Image Converter Pro
Version	6.2
Platform	Windows (64-bit)
Category	Image Tools
Output Formats	21 raster formats
Input Formats	22 format families, including 47 RAW camera types
Max Parallel Workers	128
Max Resize Dimension	8,000 px (64 MP ceiling)
Processing	100% offline / local
License Management	Gumroad

Turbo Batch Image Converter Pro is a conventional Windows desktop application, distributed as a standard installer and licensed with a one-time purchase through Gumroad. There is no subscription, no account to maintain, and no ongoing connection requirement.

Getting Set Up

1. Complete the purchase. Checkout runs through Gumroad, which issues your license key and a download link immediately. The key is also emailed to you, so keep that message for future reference — it is what you will need if you ever move to a new machine.
2. Run the installer. The installer is a standard signed Windows package. Because it is an independent software product rather than a Microsoft Store listing, Windows SmartScreen may show a warning on first launch; choose More info and then Run anyway to proceed.
3. Activate with your key. On first launch the app asks for your license key. This is the one moment an internet connection is required: the key is verified once against Gumroad's licensing service. The request carries no file names, no image data and no personal information beyond the key itself.
4. Work offline from then on. Once verified, the activation is cached locally. Every subsequent launch and every conversion runs entirely on your machine with no network access, which is what makes the app viable on isolated and air-gapped systems.

What the License Covers

The purchase is a perpetual license for the version you buy, at a one-time price of $29.99. There is no per-file cap, no monthly conversion allowance and no batch-size limit — the constraints on a run are your own disk space and memory, not a commercial quota. Because processing is entirely local, output produced with the app carries no watermark and no attribution requirement, and is yours to use commercially.

If you are unsure whether Pro is the right tier, the comparison table further down this page sets it against Turbo Batch Image Converter Lite and Turbo RAW Image Converter. Step-by-step activation instructions for every TurboSoft application are available on the activation guide, and licensing questions can be raised through support.

Most problems in batch conversion work come down to a handful of recurring causes. The scenarios below cover what users encounter most often, along with what is actually happening underneath.

Every pairing below is supported directly, with no intermediate step and no separate plug-in. Select the source type in the From dropdown and the destination type in the To dropdown, and the matching decoder and encoder are loaded automatically.

Browse all image conversion guides →

JPG	→	PNG, AVIF, HEIC, BMP, TIFF, SVG, GIF, WEBP, ICO, PSD, TGA, DDS, JPEG2000, EXR, HDR, WBMP, PCX, PPM, PGM, PBM
JPEG	→	PNG, AVIF, HEIC, BMP, TIFF, SVG, GIF, WEBP, ICO, PSD, TGA, DDS, JPEG2000, EXR, HDR, WBMP, PCX, PPM, PGM, PBM
PNG	→	JPG, AVIF, HEIC, BMP, TIFF, SVG, GIF, WEBP, ICO, PSD, TGA, DDS, JPEG2000, EXR, HDR, WBMP, PCX, PPM, PGM, PBM
HEIC	→	JPG, PNG, AVIF, BMP, TIFF, SVG, GIF, WEBP, ICO, PSD, TGA, DDS, JPEG2000, EXR, HDR, WBMP, PCX, PPM, PGM, PBM
HEIF	→	JPG, PNG, AVIF, BMP, TIFF, SVG, GIF, WEBP, ICO, PSD, TGA, DDS, JPEG2000, EXR, HDR, WBMP, PCX, PPM, PGM, PBM
RAW	→	JPG, PNG, AVIF, HEIC, BMP, TIFF, SVG, GIF, WEBP, ICO, PSD, TGA, DDS, JPEG2000, EXR, HDR, WBMP, PCX, PPM, PGM, PBM
AVIF	→	JPG, PNG, HEIC, BMP, TIFF, SVG, GIF, WEBP, ICO, PSD, TGA, DDS, JPEG2000, EXR, HDR, WBMP, PCX, PPM, PGM, PBM
BMP	→	JPG, PNG, AVIF, HEIC, TIFF, SVG, GIF, WEBP, ICO, PSD, TGA, DDS, JPEG2000, EXR, HDR, WBMP, PCX, PPM, PGM, PBM
TIFF	→	JPG, PNG, AVIF, HEIC, BMP, SVG, GIF, WEBP, ICO, PSD, TGA, DDS, JPEG2000, EXR, HDR, WBMP, PCX, PPM, PGM, PBM
TIF	→	JPG, PNG, AVIF, HEIC, BMP, SVG, GIF, WEBP, ICO, PSD, TGA, DDS, JPEG2000, EXR, HDR, WBMP, PCX, PPM, PGM, PBM
GIF	→	JPG, PNG, AVIF, HEIC, BMP, TIFF, SVG, WEBP, ICO, PSD, TGA, DDS, JPEG2000, EXR, HDR, WBMP, PCX, PPM, PGM, PBM
WEBP	→	JPG, PNG, AVIF, HEIC, BMP, TIFF, SVG, GIF, ICO, PSD, TGA, DDS, JPEG2000, EXR, HDR, WBMP, PCX, PPM, PGM, PBM
ICO	→	JPG, PNG, AVIF, HEIC, BMP, TIFF, SVG, GIF, WEBP, PSD, TGA, DDS, JPEG2000, EXR, HDR, WBMP, PCX, PPM, PGM, PBM
PSD	→	JPG, PNG, AVIF, HEIC, BMP, TIFF, SVG, GIF, WEBP, ICO, TGA, DDS, JPEG2000, EXR, HDR, WBMP, PCX, PPM, PGM, PBM
TGA	→	JPG, PNG, AVIF, HEIC, BMP, TIFF, SVG, GIF, WEBP, ICO, PSD, DDS, JPEG2000, EXR, HDR, WBMP, PCX, PPM, PGM, PBM
JPEG2000	→	JPG, PNG, AVIF, HEIC, BMP, TIFF, SVG, GIF, WEBP, ICO, PSD, TGA, DDS, EXR, HDR, WBMP, PCX, PPM, PGM, PBM
EXR	→	JPG, PNG, AVIF, HEIC, BMP, TIFF, SVG, GIF, WEBP, ICO, PSD, TGA, DDS, JPEG2000, HDR, WBMP, PCX, PPM, PGM, PBM
HDR	→	JPG, PNG, AVIF, HEIC, BMP, TIFF, SVG, GIF, WEBP, ICO, PSD, TGA, DDS, JPEG2000, EXR, WBMP, PCX, PPM, PGM, PBM
DDS	→	JPG, JPEG, PNG, AVIF, HEIC, HEIF, BMP, TIFF, TIF, SVG, GIF, WEBP, ICO, PSD, TGA, JPEG2000, EXR, HDR, WBMP, PCX, PPM, PGM, PBM
WBMP	→	JPG, JPEG, PNG, AVIF, HEIC, HEIF, BMP, TIFF, TIF, SVG, GIF, WEBP, ICO, PSD, TGA, DDS, JPEG2000, EXR, HDR, PCX, PPM, PGM, PBM
PCX	→	JPG, JPEG, PNG, AVIF, HEIC, HEIF, BMP, TIFF, TIF, SVG, GIF, WEBP, ICO, PSD, TGA, DDS, JPEG2000, EXR, HDR, WBMP, PPM, PGM, PBM
PPM	→	JPG, JPEG, PNG, AVIF, HEIC, HEIF, BMP, TIFF, TIF, SVG, GIF, WEBP, ICO, PSD, TGA, DDS, JPEG2000, EXR, HDR, WBMP, PCX, PGM, PBM
PGM	→	JPG, JPEG, PNG, AVIF, HEIC, HEIF, BMP, TIFF, TIF, SVG, GIF, WEBP, ICO, PSD, TGA, DDS, JPEG2000, EXR, HDR, WBMP, PCX, PPM, PBM
PBM	→	JPG, JPEG, PNG, AVIF, HEIC, HEIF, BMP, TIFF, TIF, SVG, GIF, WEBP, ICO, PSD, TGA, DDS, JPEG2000, EXR, HDR, WBMP, PCX, PPM, PGM

This is a professional-grade desktop tool for photographers, agencies, e-commerce teams, content creators, and anyone who values keeping their pictures on their own machine. Every job runs locally — no uploads, no cloud services, no size ceilings, and no waiting in a queue. On Windows 11 and Windows 10 it reads every mainstream picture type plus 47 RAW camera formats, so it comfortably handles jobs like turning a Canon or Nikon shoot into deliverable JPGs, moving a website's assets to WebP, or flattening an iPhone HEIC export into something universally shareable. A multi-threaded core with up to 128 parallel workers keeps large runs fast, while Fit, Fill, and Stretch modes with dimensions up to 8,000 px let you reshape pictures in the same pass. It all ships as one lightweight install — no plugins, companion utilities, or web services required.

Looking for something simpler? Check out Turbo Batch Image Converter Lite, which covers the most common formats — JPEG, PNG, WEBP, GIF, BMP, TIFF, SVG, and ICO. If you only need RAW conversion, Turbo RAW Image Converter takes RAW camera files as input and converts them to those same everyday formats at high speed. And for cleaning up filenames in bulk, there's the Batch File Renaming Tool, also from TurboSoft.

It is worth being honest about the alternatives. You can absolutely reshape pictures one at a time in an editor, or lean on a web page that promises the same result. Both work for a handful of items. Neither holds up once the count climbs.

Situation	Manual editor / online page	This desktop engine
Reshaping 5,000 photos	Open, export, repeat — hours of clicking	One folder, one target, one run
Sensitive material	A web page means uploading your files	Stays entirely on your own hardware
RAW captures	Often unsupported or needs extra software	47 camera types decoded natively
Resize plus reshape	Two separate steps in most tools	Both in a single pass
Nested folders	Handle each directory yourself	Recursive sweep, layout preserved
Interrupting a job	Start over if you stop	Pause and resume the queue
Cost over time	Subscriptions or per-file limits online	A single purchase, used offline

The manual route also invites small, compounding mistakes — a wrong export setting here, an accidental overwrite there. A repeatable, settings-driven run removes that variability, which is the real reason large jobs belong in an automated pipeline rather than a mouse-driven one.

Image conversion carries a fair amount of jargon, and much of it appears in the app's own interface. These are the terms worth knowing, defined in the sense they are used here.

Alpha channel

An extra channel stored alongside red, green and blue that records how transparent each pixel is. Formats carrying alpha include PNG, WebP, AVIF, TIFF, ICO, TGA, DDS and PSD. JPEG does not, which is why transparency is filled with a solid color when converting to it.

Aspect ratio

The proportional relationship between an image's width and its height. Fit mode preserves it, Fill mode preserves it and crops the overflow, and Stretch mode overrides it to hit exact dimensions.

Batch mode

The operating mode in which a whole folder, or a whole folder tree, is processed in one run with a single set of settings applied to every file. Its counterpart is Individual mode, which converts one selected file.

Chroma subsampling

A JPEG compression technique that stores color information at lower resolution than brightness, exploiting the eye's greater sensitivity to luminance. The app's JPEG encoder uses full-quality subsampling, which keeps color edges cleaner than the more aggressive default many tools apply.

Demosaicing

The reconstruction step that turns raw sensor data into a full-color image. Each photosite on a camera sensor records only one color, so the other two must be interpolated from neighbors. This is the computationally expensive stage that makes RAW conversion slower than converting an already-rendered image.

ETA

The estimated time remaining shown on the dashboard, calculated dynamically from throughput observed so far rather than from a fixed per-file assumption. It becomes more accurate as a run progresses and the average settles.

EXIF

The metadata block cameras and phones embed in image files, recording capture date, camera model, lens, exposure settings and often GPS coordinates. For output containers that support it, the original EXIF block is copied into the result so this information survives conversion.

Fit, Fill and Stretch

The three resize modes. Fit scales the image to sit entirely inside your target box without cropping or distortion. Fill scales it to cover the box completely and center-crops the overflow, producing exact dimensions. Stretch forces exact dimensions by distorting the aspect ratio.

Lanczos resampling

The resampling algorithm used when resizing. It weighs a wider neighborhood of surrounding pixels than simpler methods, which preserves fine detail and edge sharpness noticeably better when scaling images down — the direction most batch resizing goes.

Lossless

Compression that reconstructs the original pixels exactly. PNG, BMP, TIFF with LZW or ZIP, and WebP with the Lossless option enabled all qualify. Repeated conversion between lossless formats causes no cumulative degradation.

Lossy

Compression that permanently discards image information to achieve much smaller files. JPEG, HEIC, AVIF and default-setting WebP are lossy. Each re-encode applies fresh loss, so lossy files should be produced once as a final export rather than used as a working format.

LZW

Lempel–Ziv–Welch, a lossless compression scheme and the default choice for TIFF output. Widely supported by older software, which makes it the safe option for archives that must remain readable for a long time.

Megapixel ceiling

The 64-megapixel cap the app applies to resize targets. It prevents an accidentally extreme width and height combination from allocating enough memory to destabilize the system.

Parallel worker

One independent conversion task running at the same time as others. Each worker loads, optionally resizes and saves a single image without sharing image data with any other worker, which is what makes parallel operation safe. The count is adjustable from 1 to 128.

Quantization

The step in lossy compression where precise values are rounded into coarser buckets. Quality sliders effectively control how aggressive that rounding is, which is why the relationship between a quality number and the resulting file size is steeply non-linear rather than proportional.

RAW

Unprocessed sensor data in a manufacturer-specific container rather than a finished image. Because each manufacturer designs its own, the app supports 47 distinct RAW formats including CR2, CR3, NEF, ARW, DNG, RAF, ORF and RW2.

Recursive scan

Sub-folder Mode's behavior of walking every directory beneath the folder you select, at any depth. When output is sent to a separate destination, the original nested structure is recreated there.

RGBE

The 32-bit encoding used by Radiance HDR files, storing a shared exponent alongside red, green and blue to represent a far wider range of brightness than an eight-bit format can. HDR output is always written this way, so it needs no quality setting.

RLE

Run-Length Encoding, a lossless scheme that stores repeated identical pixels as a count rather than individually. Available as an option for TGA output, where it shrinks flat-color artwork and game textures considerably while leaving photographic content largely unchanged.

Thread pool

The managed set of workers across which queued files are dispatched. Sizing it is what the Threads slider controls, and Auto-Scale Workers sets it from your processor's core count automatically.

Throughput

The rate at which files complete, reported live on the dashboard in files per second. It is the practical measure for tuning worker count, since it reflects real behavior on your hardware rather than theoretical capacity.

TurboSoft offers three image converters. Pro is the complete tool with the widest format range, per-format quality settings, and RAW support. Lite keeps things simple with the everyday formats, and Turbo RAW Image Converter is focused purely on turning RAW camera files into common formats.

Capability	Pro	Lite	RAW
Everyday formats (JPEG, PNG, WebP, GIF, BMP, TIFF, SVG, ICO)	Yes	Yes	Output only
Modern formats (HEIC, AVIF)	Yes	Limited	Output
Professional formats (PSD, TGA, DDS, JPEG 2000, EXR, HDR, WBMP, PCX, PPM, PGM, PBM)	Yes	No	No
47 RAW camera formats as input	Yes	No	Yes
Batch and recursive sub-folder conversion	Yes	Yes	Yes
Fit / Fill / Stretch resizing	Yes	Yes	Yes
Per-format quality and compression settings	Yes	Basic	Basic
Up to 128 parallel workers	Yes	Yes	Yes
100% offline processing	Yes	Yes	Yes

Choose Pro if you work with RAW files, professional or HDR formats, or want fine control over every output. Choose Lite for quick everyday conversions, or the RAW converter if RAW-to-common-format is all you need. Feature availability in Lite and RAW is summarized here for guidance; see each product page for its exact format list.

Answers to the questions we are asked most often about Turbo Batch Image Converter Pro, grouped by topic. If something is not covered here, the full FAQ and support page go into more detail.

Formats and Conversions

Batch Processing and Performance

Resizing and Output Quality

Files, Folders and Metadata

Privacy and Offline Use

System Requirements, Install and Licensing