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ZIP to 7z

Repack ZIPs as high-ratio 7z. Convert ZIP archives to 7z format with LZMA compression using a real 7-Zip engine compiled to WebAssembly.

Your file never leaves your device — everything is processed locally in your browser.

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How to use ZIP to 7z

  1. Drop your file into the upload box above (or click to browse).
  2. Adjust the options to your liking.
  3. Click the process button — everything runs instantly in your browser.
  4. Download your result. Your file was never uploaded anywhere.

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Part of 7 ZIP Tools on fltools — all free, all on-device.