SciZone icon
SciZone icon

SciZone

SciZone converts JPG, PNG, HEIC, TIFF, GIF and WebP images to WebP or AVIF directly in your browser. The encoder is a C++ library compiled to WebAssembly, so your photos never leave your device. Open DevTools and watch the Network tab: nothing is sent.

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Cost / License

  • Free
  • Proprietary

Application type

Platforms

  • Online
Batch processing
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SciZone was added to AlternativeTo by a-averich on and this page was last updated .

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What is SciZone?

SciZone converts JPG, PNG, HEIC, TIFF, GIF and WebP images to WebP or AVIF directly in your browser. The encoder is a C++ library compiled to WebAssembly, so your photos never leave your device. Open DevTools and watch the Network tab: nothing is sent.

Why people use it:

  • Nothing is uploaded. Conversion runs entirely on your device, unlike online converters that send your photos to a server.
  • No limits. Drop a folder of 1000+ photos, any file size, no daily quota, no account.
  • Smart per-image quality. Each image gets its own quality search for the smallest file without visible loss, instead of one fixed slider.
  • Fast. Uses every CPU core: 15 photos to WebP in about 2 seconds on a recent laptop.
  • iPhone HEIC photos work on Windows, macOS, Linux and Android.
  • WebP and AVIF output, EXIF and color profiles kept, results as a ZIP.
  • Google Drive and Dropbox folders are converted in place, with the folder tree kept.
  • Works offline and can be installed as an app (PWA).
  • Free, no ads in the tool, no registration.