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Compress Image to Under 20KB — Signature & Portal Photo Compressor

Compress scanned signatures, ID photos and stamps to strictly under 20 KB in your browser. Free, private, no upload.

In plain words: University exam forms, government portals and visa applications often reject signature or thumbprint scans over 20 KB. Drop your image here and WeShoal automatically adjusts quality and resolution in your browser until your file is guaranteed under 20 KB.

🔒 100% Local Browser Execution — Files never leave your device ✓ No email · No sign-up · No watermark · Free
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Drop photos here (HEIC, WebP, PNG, JPG, AVIF) or click to browse You can also paste an image from your clipboard (Ctrl+V) — batch convert & ZIP supported
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How to Use Compress Image to Under 20KB — Signature & Portal Photo Compressor

  1. Drop your signature scan, stamp or ID photo into the box (JPG, PNG, WebP or iPhone HEIC).
  2. Leave the Target Max Size set to Under 20 KB (Strict) and Output Format set to JPG.
  3. Click Convert & Compress All to run our automatic binary-search compressor on your device.
  4. Download your finished JPG guaranteed to be 20 KB or smaller.
Strict government, exam and banking portals frequently enforce a hard 20 KB ceiling on uploaded signature and thumbprint images. Manually guessing quality sliders in a photo editor takes dozens of tries. WeShoal uses an automatic two-stage binary search inside your browser: it first tests JPEG quality steps, and if a high-megapixel phone photo still exceeds 20 KB, it smoothly scales pixel dimensions down until the file lands strictly under 20,480 bytes. Your signature or ID photo never leaves your device.