Compress Signature to 20KB.
Free and private — reduce your signature photo to 20KB in your browser. No sign-up, no upload.
Drop your photo here
or tap anywhere to choose a file
Why 20KB for a signature?
A 20KB limit for a signature upload is stricter than usual, but it is workable because a signature — dark ink on white paper — contains relatively simple image data. At 20KB, the ink strokes remain sharp and the signature is easily legible, as long as the original photo was taken well (good light, no shadows, plain white background).
Many application portals specify a 20KB limit for signatures alongside a separate, slightly larger limit for passport photos. Always check the specific instructions for the form you are filling in, as requirements can change between application cycles.
Your signature stays on your device
Signatures are legal identifiers. ToolKB never uploads your file to any server — the entire compression process runs inside your browser. You can confirm this by opening the Network tab in your browser's developer tools (F12) during compression.