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7/25/2026
Client-side image compression in the browser: APIs, pitfalls, and privacy

Client-side image compression in the browser: APIs, pitfalls, and privacy

Original: CompressPower

Short summary

Browser APIs (createImageBitmap, OffscreenCanvas, convertToBlob) have supported fully client-side image compression since 2012, eliminating server roundtrips and keeping files on the user's machine. The article covers practical pitfalls: non-linear quality curves, EXIF/orientation stripping, color profile loss, alpha channel handling, and memory limits for large images. A target-size binary search loop outperforms naive quality sliders, and Worker-based processing prevents tab crashes on big files.

  • •Browser-native APIs enable zero-upload image compression with no dependencies
  • •Key pitfalls: EXIF stripping, color profile loss, non-linear quality curves, memory limits on large files
  • •Privacy is architectural, not a promise — files never leave the machine

Generated with AI, which can make mistakes.

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