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Signature to 20 KB
Lands just under the ceiling, not far below it. Nothing is uploaded.
More free conversions, where you upload. The Fylane extension does the same work inside any upload form, on its own free share every day.Add to Chrome
How to convert Signature to 20 KB
- Scan or photograph the signature, then crop away everything but the ink.
- Drop it here — the target is already 20 KB.
- Download the file and upload it to the form.
What happens to your file
Ten to twenty kilobytes is the band most Indian examination forms want a signature in, and the upper number is the one that matters: a file has to be under the ceiling without falling under the floor. The search here stops just below 20 KB rather than racing to the smallest possible file, which is why a scan that starts at 83 KB comes back at about 19.8 KB and not at 4 KB. A tool that hands you 12 KB when the rule says 10–20 KB has not helped you; it has used up most of your margin for nothing.
The file never leaves your device. A JPG, PNG or WebP is decoded by the browser and a bounded search lowers the encoder quality — at most six probes — until it fits. Ink on white paper compresses far better than a photograph, so the dimensions usually survive untouched.
What the authorities actually say, read from their own 2026 notices on 18 September 2026. SSC (CGL and CHSL 2026): JPEG, 10–20 KB. IBPS (PO-XVI, CSA-XVI, RRBs-XV) and SBI (PO and Junior Associates): JPG, 10–20 KB, 140 × 60 pixels, black ink on white paper. NEET and JEE Main 2026: 10–100 KB, with no pixel rule published at all. UPSC CSE 2026 is the outlier — 20–100 KB, 350–500 pixels on both sides, and three signatures one below the other. Railway RRB is the other outlier at 30–49 KB.
So this page is for the 10–20 KB exams: SSC, IBPS and SBI. If you are applying to UPSC or a Railway Recruitment Board, 20 KB is below their minimum and the file would be refused — use Compress image and pick the target that lands inside their window instead.
Two things worth knowing that most pages about this do not mention. SSC and the Railway boards have stopped accepting an uploaded photograph altogether: the form captures one live through your camera, and photographing an existing print is grounds for rejection. The signature is now the only image most of these forms take from you.
Questions
What size should my signature be for SSC?
JPEG between 10 KB and 20 KB. The 2026 notices for CGL and CHSL give two different physical sizes in the same document — 6.0 × 2.0 cm in the instructions and 4.0 × 2.0 cm in Annexure IV — and they do not publish a pixel size at all. Sign inside a box of either shape and the kilobyte rule is the one that gets enforced.
Why was my signature rejected?
The Railway boards publish nine reasons and they are a fair checklist for any of these forms: a background that is not white, ink that is not black, writing in block or capital letters, a blurred or low-resolution scan, a signature that is cut off, a blank image, a thumb impression used in place of a signature, and a signature that is not yours. Nothing a compressor does can fix any of those — they are decided before you scan.
Should I write in capitals?
No. IBPS and SBI state plainly that a signature or handwritten declaration in capital letters will not be accepted, and the Railway boards list block capitals among their rejection grounds. Sign in your ordinary joined-up hand.
Is 20 KB too small for the file to be readable?
Not for a signature. It is a few strokes of dark ink on a plain background, which is the easiest thing there is to compress — far easier than a face. A photograph at 20 KB suffers badly; a signature at 20 KB does not.
My form wants 140 × 60 pixels as well. What order?
Resize to the pixel size first, then compress to the kilobyte limit. Doing it the other way round undoes the compression, because changing the dimensions changes the file size again.
Do I need to upload a photograph too?
For SSC and the Railway boards, no — not any more. Their 2026 forms take the photograph live through your camera while you fill the application in, and explicitly reject a picture of an existing photograph. IBPS, SBI, UPSC, NEET and JEE Main still want an uploaded photo as well as a live capture.
Is it really not uploaded?
For JPG, PNG and WebP, correct — the page works with your network unplugged. The privacy sweep in our test suite asserts that no host is contacted. That matters more than usual here: a signature is the one image on the form that can be misused.
Do it once, not on every form
A form that wants a square JPEG under 240 KB says so on the page. The Fylane extension reads that, fits your photo to it, and puts it in the field — without you working out what 240 KB looks like.
And it keeps the result. The next application that asks for a résumé, a cover letter and a photo fills all three from one tap, each one refitted to what that site accepts.
Your files stay in the browser, encrypted, on your machine. Nothing is uploaded to keep them and nothing is sent anywhere to fill a form.
Related tools
Do this in code
curl -X POST https://api.fylane.dev/v1/jobs \
-H "Authorization: Bearer $FYLANE_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"file_id": "<file id>",
"operation": "image.convert",
"options": {
"target_bytes": 20480
}
}'The same operation, image.convert — Re-encode to WebP, JPEG, PNG or AVIF at your quality. Upload first with the quickstart; every option is on the operations page. 500 free credits a month, then $5 per thousand.