Convert ZIP to 7Z
Convert ZIP archives to the highly efficient 7Z compression format without uploading anything to a server.
Drag & drop a .zip file here, or browse
Max size: 500 MB (Desktop)
Why Use Client-Side 7Z?
Ultimate Data Privacy
No servers, no cloud storage, no logs. Your files are processed entirely within a browser Web Worker sandbox.
High Compression Ratio
7Z archives powered by LZMA compression drastically reduce file sizes compared to standard ZIP archives.
Unicode & Folder Fidelity
Preserves complete directory hierarchies and special character filenames exactly as originally archived.
Zero Memory Leaks
Automatically revokes memory allocations, unmounts virtual files, and terminates workers upon task completion.
System Specifications:
- • Engine: WebAssembly (7z-wasm / Emscripten)
- • Concurrency: Non-blocking Web Worker
- • Max Desktop Limit: 500 MB
- • Max Mobile Limit: 100 MB
Compatible with Chrome, Edge, Firefox, and Safari on desktop and mobile devices.
What is ZIP to 7Z?
ZIP to 7Z processes your files securely in your browser. No installation or registration is required.
The tool runs on your device, so your files never need to be uploaded to our servers.
Key Features
Browser-Based Conversion
Convert files directly in your browser without uploading to any server.
High Compression Ratio
7Z format provides superior compression compared to ZIP.
Fast Processing
Powered by WebAssembly for near-native performance.
Completely Free
No registration, no limits, totally free to use.
How It Works
- 1
Upload File
Select or drag and drop your file into the tool.
- 2
Process
Choose your settings and start processing.
- 3
Download
Download the processed file directly to your device.
Supported Formats
Privacy & Security
Your files stay in your browser and are not uploaded to our servers.
Frequently Asked Questions
Frequently asked questions about ZIP to 7Z.
Yes. This tool is free and requires no registration.
No. Processing happens locally in your browser, so your files stay on your device.
The practical limit depends on your device's available memory.
Yes. The tool works in modern desktop and mobile browsers.
Current versions of Chrome, Safari, Firefox, and Edge are supported.