BMP stores image data completely uncompressed, while WebP was built by Google specifically to deliver smaller files for the web, supporting both lossy and lossless compression in one format. Converting a batch of BMP files to WebP can shrink file sizes dramatically — WebP's lossless mode alone typically produces a much smaller file than BMP's raw storage, while still preserving the image exactly.
WebP also supports a full alpha channel, which BMP doesn't offer in its standard form, making WebP a more capable target if your workflow benefits from transparency going forward.
- Install Turbo Batch Image Converter Pro on your Windows PC.
- Open the app and select Batch Mode for multiple files, or Individual Mode for a single BMP.
- Drag your BMP file or folder into the app window, enabling recursive folder scanning if needed.
- Set the "From" format to BMP and the "To" format to WebP.
- Choose lossless mode to preserve exact quality, or lossy mode for smaller files.
- Click Convert. WebP files are written to the output folder, fully offline.
- 100% offline — your images are never uploaded anywhere
- Bulk conversion of entire folders, including sub-folders, in one click
- Choice of lossless or lossy output depending on your quality needs
- Dramatic file size reduction compared to uncompressed BMP
- Multi-core processing for fast handling of large batches
- Option to delete original BMP files automatically after conversion
If you only need straightforward format conversion without RAW or HEIC support, Turbo Batch Image Converter Lite covers this exact BMP-to-WebP conversion in a lighter, more focused app.
Should I use lossless or lossy WebP for my BMP files?
Lossless WebP preserves the exact image data, similar to PNG, while still typically reducing file size compared to BMP, and lossy mode shrinks files much further if some quality tradeoff is acceptable.
How much smaller will my files be after converting?
Significantly smaller in most cases, since BMP stores data completely uncompressed while WebP applies genuine compression even in its lossless mode.
Can I convert an entire folder of BMP files to WebP at once?
Yes, Batch Mode handles entire folders, including nested sub-folders, and scales conversion speed across multiple CPU cores.
Ready to convert your images offline, in bulk, with full privacy?