Turbo Large Data Splitter

Turbo Large Data Splitter is a Windows tool built to split CSV into multiple files, split Excel files into multiple files, and merge them back together again, all without the row limits and memory problems that come with opening huge files in Excel or a spreadsheet app. It can split CSV, TSV, TXT, XLSX, XLS, JSON, XML, and SQL dump files, converting formats while splitting, for example turning one giant CSV file into several smaller XLSX files.

Every file is read and written in a single streaming pass, so multi-gigabyte and 100 GB+ files are supported as long as there's enough free disk space for the output. The exception is legacy .xls, read whole into memory, which is fine because .xls itself caps at 65,536 rows. Eight input formats and six output formats work together, with conversion built into the same pass as the split.

Seven split methods cover the ways large data actually needs dividing: Number of Rows for a fixed count up to 1,000,000 per file, File Size for a target MB, Column Value for one file per distinct value, Date Column for day, month, or year grouping, Alphabet Ranges bucketing into A-F, G-L, M-R, S-Z, 0-9, and Other, Duplicate Values splitting rows into duplicate and first-seen files, and Unique Values keeping only the first occurrence of each row.

An 'Advanced CSV / TSV / TXT Settings' section covers delimiter, encoding, header handling, sort, filter, dedupe, and XML record tag, all configurable before Preview and Start Split. Preview reports row count, columns, and an estimate of output files; the status bar then shows live progress, speed, and an ETA as the job runs. XLSX workbooks with multiple sheets show a sheet selector automatically.

A checkpoint written to the output folder lets an interrupted job resume by running the identical job again, CSV, TSV, TXT, and SQL resume by byte offset, XLSX, JSON, and XML resume by row count. Output can be left uncompressed, zipped or gzipped per part, or bundled into one archive, sped up by a parallel-workers slider. The Merge tab handles the reverse direction: merge CSV files into one file, merge CSV files into an Excel workbook, or merge XLSX files into one workbook.

License activation verifies your email and key once against Gumroad, then caches locally so the app works entirely offline afterward. There's no upload step, no cloud service, no file-size limit, and no waiting queue, keeping large or sensitive data files fully under your control throughout processing. Delimiter and encoding both default to Auto for relevant formats and are detected directly from the file itself, so you only need to touch them in the rare case detection gets something wrong, an unusual delimiter or a legacy encoding, for example. This makes the tool equally useful for data analysts working with irregular exports, developers automating a recurring pipeline step, e-commerce teams distributing catalog data by category, and anyone else who regularly runs into the practical limits of opening a large data file directly in a spreadsheet program.

1. Install Turbo Large Data Splitter on your Windows PC.
2. Activate your license once, with a brief internet connection.
3. On the Split tab, add your file by browsing, dragging, or Recent Files.
4. Choose input and output format, and your output folder.
5. Select one of the seven split methods and its setting.
6. Adjust advanced settings for delimiter, encoding, sort, filter, or dedupe if needed.
7. Run Preview, then click Start Split and monitor live speed and ETA.
8. Use the Merge tab afterward if you need to combine files back together.
9. Adjust the parallel worker slider if compressing many output parts.
10. Check the status bar for the final row count and file count summary.

• Eight input formats: CSV, TSV, TXT, XLSX, XLS, JSON, XML, SQL dumps
• Six output formats with conversion built into the same pass
• Seven split methods: rows, size, column value, date, alphabet, duplicates, unique
• Streaming engine handles multi-GB and 100 GB+ files
• Sheet selector for multi-sheet XLSX, checkpoint-based resume
• Merge tab combines files back into one, including Excel workbooks
• Runs fully offline after license activation, one-time purchase
• One-time purchase for Windows, with Gumroad license activation
• Compression options: uncompressed, per-part ZIP/gzip, or a single bundled archive
• Works with files on local drives, external drives, and network shares