File Splitter
Split a large file into smaller numbered parts — set the chunk size and download each piece. It all runs in your browser; nothing is uploaded.
Runs in your browser. Your input is not uploaded to PayloadIQ.
Split big files without uploading them
Hitting an attachment or upload size cap? Drop a file, choose a chunk size, and PayloadIQ slices it into numbered parts (.001, .002, …) right on your machine. The slicing uses the browser's File API, so even a 1 GB file never leaves your device.
Rejoin them anywhere
The parts are exact byte slices, so they rebuild the original perfectly when concatenated in order — no special software needed, just cat on macOS/Linux or copy /b on Windows. To verify the rebuilt file matches, hash both with the File Hash tool.
FAQ
Is my file uploaded to split it?
No. The file is sliced directly in your browser using the File API — each part is created on your device and downloaded locally. Nothing is ever sent to a server, so it's safe for private or sensitive files.
How do I choose the part size?
Set the chunk size in megabytes. The tool shows how many parts you'll get — for example, a 1 GB file with a 100 MB chunk size produces ten parts (.001 to .010).
How do I put the file back together?
The parts are byte-for-byte slices, so concatenating them in order rebuilds the original exactly. On macOS/Linux run cat "file".* > "file"; on Windows use copy /b file.001+file.002+… file.
What's the size limit?
Up to 1 GB. Slicing is memory-efficient (parts reference the original file), but very large files still depend on your browser and available memory.