Private File Extractor
Extract archives without uploading your files anywhere. 100% browser-based, zero data transmission.
Your Files Stay on Your Device
Most "online" archive extractors upload your files to their servers for processing. That means your private documents, photos, and data pass through unknown third parties. JustUnzip is different - it uses WebAssembly to process files entirely in your browser. Your files literally never leave your computer.
JustUnzip vs. Other Online Extractors
| Feature | JustUnzip | Typical Services |
|---|---|---|
| File Upload | None - Local Only | Uploads to Server |
| Server Access to Files | Never | Full Access |
| Data Retention | Nothing Stored | Hours to Days |
| Works Offline | Yes (after load) | No |
| File Size Limits | Device Memory Only | Often 50-200MB |
| Account Required | No | Sometimes |
How Private Extraction Works
WebAssembly Engine
libarchive runs as compiled WebAssembly code directly in your browser.
Local Processing
Files are read from your device, processed locally, and never transmitted anywhere.
Nothing Stored
Close the tab and everything is gone. No cookies, no cache, no traces.
When Private Extraction Matters
- Confidential Documents - Legal files, contracts, financial records that shouldn't touch third-party servers.
- Personal Photos & Videos - Keep your memories private instead of uploading them to unknown services.
- Work Files - Company data that must stay within your control for compliance reasons.
- Medical Records - Health information protected by privacy regulations.
- Source Code - Proprietary code that competitors shouldn't see.
Verify It Yourself
Open your browser's Developer Tools (F12), go to the Network tab, and watch while you extract a file. You'll see no upload requests - just the initial page load. The extraction happens entirely in your browser.
- Press F12 or right-click → Inspect
- Click the "Network" tab
- Drop a file onto the extractor
- Notice: no file upload requests appear