Zip 1 GB in 16 seconds. Runs entirely on YOUR computer.
Free browser ZIP creator. No uploads. No signup. No file size limits. Works offline after the page loads.
Email attachment too big. A folder of 200 photos that won't go through in one upload. A client portal that only accepts a single file. One ZIP archive solves all three — and this one runs entirely on YOUR computer. Nothing is uploaded.
Up to 8× faster than other online ZIP tools.
Same 854 MB folder. Same machine. Same connection. Online tools upload, zip server-side, then ship the result back — we skip both legs.
| Zipping 854 MB / 234 files | Time |
|---|---|
| Bulk Archiver (in-browser) | 16 sec |
| files2zip | 23 sec |
| ezyzip | 36 sec |
| Archive Extractor | 128 sec |
End-to-end timing: from drop (or upload) to last byte saved. Server-side tools are bandwidth-bound — 854 MB up + 854 MB down ≈ 1.7 GB over the wire before they even start compressing. The bigger the archive, the larger the gap.
Lightning Fast
Zip 854 MB in 16 seconds — up to 8× faster than online ZIP tools because there's no upload step.
100% Private
Your files never leave your computer. No uploads. No servers. Ever. Safe for HIPAA, GDPR, and confidential work.
Works Offline
Disconnect your Wi-Fi and keep zipping. Once the page loads, it works with no internet connection at all.
No File Limits
Zip multi-gigabyte folders with no artificial limits. No signup. No watermark. No "upgrade to remove the cap" pop-ups.
Why upload your files… when you don't have to?
Every ZIP is built on your own computer. That solves a lot of everyday problems in one step:
Email attachment too large? Zip the folder into one file the recipient can save in one click.
Sharing hundreds of photos? Build one archive in seconds — no per-file upload, no batch cap.
Sending project files to a client? Keep your folder structure intact inside a single .zip.
Backing up sensitive documents? Package everything locally — confidential files never touch a server.
How this compares to ezyzip, ilovezip, archive.online, others
| Feature | Us (in-browser) | Typical online zip tools |
|---|---|---|
| Files leave your device? | No — local only | Yes — uploaded to server |
| Free tier size cap | None — zip multi-gigabyte folders | Usually 500 MB – 2 GB |
| Batch / number of files | Unlimited | Often capped at 20–100 files |
| Signup required | No | Often, after first use |
| Works offline (after page load) | Yes — disconnect Wi-Fi to verify | No |
| Speed for large folders | Limited only by your CPU | Upload + download round-trip dominates |
Which compression level to use
Three practical choices. Pick by what's inside the archive:
None
Photos, videos, PDFs. Already compressed — skip the CPU work and finish faster.
Balanced ⭐ Recommended
Most everyday folders. The sweet spot — works well for almost anything.
Maximum
Text, CSV, code, logs. 5–10% smaller than Balanced; slower.
How to zip files online (step by step)
- Open Bulk Archiver. Loads in any modern browser; no signup or extension.
- Drop your files. Drag one file or a folder of many onto the dropzone. There's no per-file size cap and no batch cap.
- Pick a compression level. Balanced works for almost everything; see the cards above for when to deviate.
- Click Create ZIP. The .zip is built in your browser and downloads to your device. Your originals are untouched.
Zip a whole folder
Dragging a folder is supported on desktop Chrome, Edge, Firefox, and Safari — the relative folder structure is preserved inside the .zip. Empty folders are skipped. On mobile, the OS only exposes individual files through the share sheet, so you'd select multiple files manually instead of dragging a folder.
If you have a complex folder with thousands of files, the browser may take a couple of seconds to enumerate everything before the dropzone reacts. That's the OS reading the directory tree, not an upload.
FAQ
How do I zip files online without uploading them?
Use a browser-based tool that does the zipping on your computer. The files never leave your device — your browser builds the .zip locally and hands you the result. You can verify by disconnecting from Wi-Fi after the page loads; the tool keeps working. Most popular online zip tools, by contrast, do upload your files to a server and zip them there.
What's the maximum file size I can zip online?
When the work happens in your browser, the limit is your device's RAM, not a server quota. Modern desktops handle multi-gigabyte archives without issue; phones are more limited (usually a few hundred MB before the tab gets killed). Tools that upload to a server typically cap the free tier at 500 MB or 2 GB.
Can I zip a whole folder, not just individual files?
Yes. Drag the folder onto the dropzone (in Chrome, Edge, Firefox, or Safari on desktop) and the relative folder structure is preserved inside the .zip. On mobile, the OS only exposes individual files, so you'd select multiple files manually.
Do I need to install anything?
No. The tool runs entirely in the browser tab — no extension, no signup, no download. The zip is built on your computer.
What compression level should I use?
For text (CSV, JSON, source code, .docx, .xlsx), maximum gives 10–30% extra savings over balanced. For already-compressed files (JPG, PNG, MP4, MP3, PDF), no compression level helps much — the data is already compressed. In those cases, pick "None (store only)" to skip CPU work and finish faster.
What .zip format does this create?
Standard PKZIP with DEFLATE compression and ZIP64 extension when needed. Opens with macOS Archive Utility, Windows Explorer, 7-Zip, WinRAR, WinZip, and every other archive tool. Not RAR or 7z — those formats are separate.