ZIP Builder
Drop a few files into the browser and download them as a single .zip — no upload, no install, fast compression.
No files yet — drop or pick a few.
Everything runs in your browser — files never leave your device.
How to use
- Drop files into the upload area, or click to pick them.
- Set the output filename (defaults to
archive.zip). - Hit Build, then Download. The size of the archive and the compression ratio are shown after building.
About this tool
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Drop in as many files as you like — or a whole folder — and download them as a single ZIP without installing anything or handing the files to a service. Folder structure is preserved, so a directory dragged in comes back out with its paths intact, and two files that would land on the same name are numbered apart rather than one quietly overwriting the other. Compression runs at a middle level, the same trade-off most archivers pick by default: noticeably smaller than storing files raw, and far quicker than squeezing out the last percent. The archiving happens in the page, so the files never leave your device — which is the point when the reason you are zipping them is to attach them to an email in the first place.
Frequently asked questions
Are the files uploaded anywhere?
No. The bundling runs in your browser tab — the files are read, compressed, and offered as a download all locally. Closing the tab discards everything.
What's the size limit?
There's no hard cap, but the whole archive is held in memory at once. For mobile that's typically fine up to a few hundred MB; for very large bundles use a desktop tool that streams.
What about duplicate filenames?
When two dropped files would share a name inside the archive, the second one becomes name (2).ext, the third name (3).ext, and so on — same behaviour as macOS Finder and Windows Explorer copy-paste.
What compression level is used?
Deflate level 6, the default for most archivers. Higher levels save little extra and would noticeably slow down a phone.
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