Compress a signature image to 20 KB
Application forms often want a signature image under 20 KB. Photograph your signature and get a clean, small file in seconds.
Drop your images here
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JPG, PNG, WebP · up to 30 at once≤ 20 KB · Signature
Private by design — your images are processed in your browser and never uploaded.
One-click presets
Pick what you are uploading for — size and pixel limits are set for you. Then add your photos.
Or just pick a size
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- Photos never uploaded
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- Works on phone
Quick answer
To compress a signature to 20 KB, sign on white paper, take a photo, and drop it into KBPass above. The signature preset caps the image at 600×300 pixels and compresses it to 20 KB or less. Many forms also accept 10–50 KB; type your form's limit if it differs.
How to: Signature (20 KB)
- 1
Sign with a dark pen on plain white paper and photograph it in good light.
- 2
Drop the photo in — the signature preset targets 20 KB and 600×300 px.
- 3
Download the JPG and upload it to your form.
Frequently asked questions
What size should a signature image be?
Many online forms ask for 10–20 KB, sometimes up to 50 KB, with a wide aspect ratio. The preset uses 20 KB and 600×300 px as a safe default.
My signature looks faint after compression. What can I do?
Use a darker pen and brighter, even light when taking the photo. Higher contrast survives compression much better.