Create a ZIP Archive
Bundle any number of files into a single ZIP archive — fast, free, and private. Compression happens in your browser, so your files are never uploaded.
Works offline — everything it needs is already on your device.
File Converts creates ZIP archives on your device with a fast WebAssembly-grade compressor. Drop in as many files as you like, then download one tidy .zip — ideal for emailing or backing up. Because it runs locally, even sensitive files never leave your device.
Best for
- Sending several documents as one email attachment instead of a dozen
- Bundling a CV, cover letter and certificates for a portal that allows one upload
- Packaging a set of files for backup or handover with their names intact
Good to know
Compression depends on what you put in: text, documents and spreadsheets shrink a lot, while JPG, PNG, MP3, MP4 and photo-heavy PDFs are already compressed and will barely change size. Archives aren't password-protected, folder structure isn't preserved, and the practical size limit is your device's memory rather than a server cap.
When zipping actually helps — and when it doesn't
A ZIP does two jobs, and only one of them applies to every file. The first is bundling: turning forty loose files into one attachment that arrives intact, with the names you gave them. That job always works. The second is compression, and how much you get depends entirely on what you put in. Text, spreadsheets, Word documents, source code and CSV exports are full of repetition, so they routinely shrink by 60–90%.
Files that are already compressed barely move. JPG, PNG, WebP, MP3, MP4 and photo-heavy PDFs have had the redundancy squeezed out of them already, so a ZIP of holiday photos comes back roughly the size of the photos. That is not a fault in the archive — it is the honest result, and it is worth knowing before you assume zipping will get you under an attachment limit. If you need photos smaller, re-encode the images; if you need a big PDF smaller, compress the PDF.
Emailing many files as one attachment
Mail clients handle one 8 MB attachment far more gracefully than twenty 400 KB ones, and the recipient gets a single file to save rather than a screen of icons. Zipping also protects the filenames, which matters when the names carry meaning — invoice numbers, dates, candidate names, chapter order.
Watch the total, though. Gmail and Outlook both cap attachments at around 25 MB, and that limit applies to the archive as a whole. If your files are mostly images or video the ZIP will not compress its way under the cap, so send fewer at a time or share a link instead.
Bundling a submission or a handover
Coursework, grant applications, design handovers and job applications often ask for several documents at once, and some portals accept only one upload. A ZIP is the standard answer: put the CV, cover letter and certificates in, upload once, and the reviewer opens them all from one file.
Name the files before you zip, not after. Once the archive is built, the names inside it are what the recipient sees, and "Scan_0043.pdf" tells them nothing. If two files share a name, the archive keeps both by numbering the second rather than silently overwriting it.
Zipping files you would rather not upload
The archive is assembled in your browser, so payslips, medical letters, signed contracts and client work are never transmitted anywhere to be bundled. That is the point: zipping is a mechanical operation that has no business requiring a round trip to someone else's server. The privacy panel on this page shows the upload counter sitting at zero while you work.
It also means there is no per-file or per-day limit to run into. The practical ceiling is your device's memory, because every file is held in RAM while the archive is built — a few hundred megabytes is comfortable on a normal laptop, and multi-gigabyte archives are better handled by your operating system's built-in compressor.
What this tool does
- Input
- Any files, any mix of types
- Output
- One standard .zip (DEFLATE, level 6)
- Where it runs
- In your browser — nothing is uploaded
- Compression
- Large gains on text and documents; near zero on JPG, PNG, MP3, MP4
- Duplicate names
- Kept — the second file is numbered, not overwritten
- Folders
- Files are added flat; folder structure isn't preserved
- Encryption
- Not supported — the archive is not password-protected
- Size limit
- Your device's available memory, not a server cap
- Browsers
- Chrome, Edge, Firefox and Safari — desktop and mobile
How to convert Files → ZIP
Drop the files you want to zip into the tool above.
Review the list and remove any you don't need.
Click Create ZIP to download the archive.