Signature to 20KB Online
Upload a scanned signature and compress it to 20KB — the target size is already set.
Compress Signature to 20KB Online
Many exam and government forms ask for a separate signature upload, usually capped at 20KB — smaller than the photo limit because a signature scan has far less visual detail to preserve. Upload your signature image above and the 20KB target is already configured.
How to Reduce a Signature to 20KB
- Upload your signature — Click Upload Image or drag a file into the box above.
- Confirm the target size — This page already has the target size set to 20KB — no manual setup needed.
- Compress the image — The tool automatically searches for the highest quality that still fits under the limit.
- Download the result — Check the new file size, then click Go to Download to save it.
Why Reduce a Signature to 20KB?
Signature uploads are almost always capped tighter than photo uploads because they need far less detail to remain valid. 20KB is the size most often requested for:
- Exam and recruitment forms — SSC, banking and university applications frequently ask for a signature under 20KB, alongside a separate passport photo.
- Government e-form portals — Aadhaar, PAN and similar services often request a small signature scan alongside identity documents.
Getting a Clean Scan First
Sign in dark ink on plain white paper, photograph it in good light without shadows, and crop it fairly tight before uploading — a clean, high-contrast source image compresses to 20KB with much better legibility than a shadowy or angled photo.
Supported Image Formats
Upload JPG, JPEG or PNG (most other common image formats will also open). The result is delivered as an optimized JPEG, which compresses photographic images far more efficiently than PNG — if you specifically need to keep a PNG's transparency, use Convert Image instead.
20KB vs Maximum 20KB
Some forms ask for a photo "of exactly 20KB", while others ask for a file "up to 20KB" or "not exceeding 20KB" — these are not always the same requirement, and it's worth reading the form carefully:
- Maximum 20KB means any file at or under that size is accepted — this is what this tool targets: it searches for the highest quality that still lands at or under 20KB, so your result is safely within the limit.
- Exact 20KB is rarely enforced literally by real systems; almost all portals that say "exactly 20KB" actually mean "up to 20KB" in practice. If a portal truly rejects anything under a minimum too, compress a little less aggressively (try a nearby larger target) until the file lands inside both bounds.
Frequently asked questions
How small should a signature scan be before uploading?
Most Indian exam and government portals ask for a signature file of 10-20KB, separate from the photo upload — check your specific form for the exact limit.
Will compressing to 20KB make my signature illegible?
A signature is mostly plain background with a thin dark line, which compresses very well — it usually stays clearly legible even at 20KB, unlike a detailed photo at the same size.
What format should I upload?
JPG or PNG both work — scan or photograph your signature on plain white paper for the cleanest result.
Is my signature image uploaded to a server?
No, compression happens entirely in your browser using the Canvas API — your file is never sent anywhere.
Can I compress a signature to a different size?
Yes — use the main Compress Image tool and enter any custom KB target.