Question 1

What does the File Splitter do?

Accepted Answer

It splits any file into smaller parts by part size (KB/MB/GB) or by number of parts. Parts are named with HJSplit-compatible extension (.001, .002, .003, ...) so they can be rejoined by any HJSplit-compatible tool. A checksum manifest (CRC32 + SHA-256 per part) is generated for integrity verification on rejoin.

Question 2

What is HJSplit format?

Accepted Answer

HJSplit is a popular cross-platform file-splitter. It names parts by appending a sequential 3-digit extension (.001 for part 1, .002 for part 2, etc.). The UnQTools File Merger rejoins these parts natively, and so does the original HJSplit app, 7-Zip, and many others.

Question 3

How does checksum verification work?

Accepted Answer

For each part, the splitter computes a CRC32 (8-char hex) and a SHA-256 (64-char hex). These are written to a .sha256 manifest file alongside the parts. The File Merger reads this manifest on rejoin and verifies each part's integrity before merging.

Question 4

What extra features does this tool have?

Accepted Answer

10 extras: (1) Drag-drop file. (2) Progress bar during splitting. (3) CRC32 checksum per part. (4) SHA-256 manifest file. (5) Stats (total size, parts count, part size). (6) Custom naming template. (7) Merge instructions display. (8) Preview first bytes of each part. (9) History (localStorage — last 10 splits). (10) Shareable URL with settings.

Question 5

Is my file uploaded anywhere?

Accepted Answer

No. All splitting runs in your browser using ArrayBuffer slicing. Your file never leaves your device.

Question 6

What's the maximum file size?

Accepted Answer

There's no hard limit, but files larger than 500MB may exhaust browser memory. For larger files, use a native HJSplit tool.

File Splitter

How to use