Free tool

Split a large ZIP file

Break one oversized zip into several smaller ones — to get under an email attachment limit, an upload cap, or a transfer size. Each part is a complete, working zip you can open on its own, not a fragment that needs rejoining.

Nothing is uploaded. The split runs inside this page, on your own machine. Your files never travel anywhere, which is also why the size of the zip you pick doesn't matter.

What it actually does

A zip is a pile of individually compressed files plus an index. Splitting it properly means dealing those files into groups that fit your size limit and writing a fresh index for each group — so this tool re-packages rather than chopping the file into blind byte ranges.

The file data is copied across still compressed, so nothing is re-zipped, no quality or compression is lost, and the split is limited by disk speed rather than by your CPU.

Common questions

My zip is too big to email — will this fix it?

Yes. Set the part size below your provider's attachment limit and send the parts as separate messages. Gmail and Outlook both cap attachments at 25 MB, so 20 MB parts leave room for the message itself.

Are the parts real zip files?

Yes — each one opens on its own in Finder, File Explorer, or any unzip tool. You don't need this site, or any special software, to open them again. That's different from multi-part archives like .z01 or .part1.rar, which are useless without every other piece.

Is there a file size limit?

No. Because the work happens on your machine rather than on a server, there's nothing to upload and no quota to hit.

Do my files get uploaded anywhere?

No. Everything happens in your browser, and the page keeps working if you disconnect from the internet after loading it.

What if one file inside is bigger than my part size?

A single file inside a zip can't be divided. It gets a part to itself, and the tool tells you which file did it — rather than silently handing back a part that breaks the limit you set.