File Splitter
Split into parts.
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Splitting a file into parts
Splitting divides a file into a series of numbered chunks of a chosen size. The operation is purely mechanical — it copies bytes — so the chunks are not independently usable. Part three of a split video is not a playable video; it is a slice of bytes that only means something once every part is joined back in order.
That makes naming and completeness critical. The parts must be recombined in exactly the right sequence, and every single one must be present, which is why split files are conventionally named with sequential suffixes. Verifying a checksum of the original against the rejoined result is the reliable way to confirm nothing was lost or reordered, particularly when the parts travelled separately.
Why we built this tool
The reason is almost always a size limit somewhere: an email attachment cap, a filesystem that cannot hold files above a certain size, an upload form, or a messaging service that rejects large transfers.
The files hitting those limits are backups, archives, and video — private, and large. Uploading a multi-gigabyte file to a splitting service is slow, and every free service caps exactly the file sizes you need this for. Ours reads the file in your browser with the File API and writes the chunks locally, so nothing is transmitted, there is no size limit beyond your device, and the split takes as long as your disk needs and no longer.
Tips and common mistakes
- Keep every part together and preserve the names — a missing part makes the whole set useless.
- Number parts with padded digits so they sort correctly in any file manager.
- Compress before splitting if the content compresses well; you may avoid splitting altogether.
- Verify by rejoining and comparing against the original before you delete anything.
Quick start: using File Splitter
- Load the file you need to divide.
- Set the maximum size per part, based on the limit you are working around.
- Run the split and download every part.
- Keep the parts together and preserve their names and order.
- Verify by rejoining them and comparing against the original before deleting it.
Rejoin the pieces with File Merger, or compress first with ZIP Creator to avoid splitting at all.