Signature Resizer — 10 to 20 KB for Exam Forms

Resize a signature for an exam or visa form

Crop a photographed signature to the ink, clean the paper to white and hit a KB range like SSC India 10-20 KB. Warns if it fills under 80 percent.

🔒 Runs in your browser

The rejection is usually the size of the signature, not the size of the file

Search for signature upload requirements and you will find kilobyte limits everywhere. Those are the easy part. The reason signatures actually come back rejected is that they are too small inside their own box — SSC lists "miniature signatures" as the main cause.

Picture what most people do: sign a sheet of A4, photograph the whole sheet, upload it. That file is a page of white paper with a small mark near the middle. It can be exactly 15 KB and exactly the right dimensions, and it is still a miniature signature.

So this tool does the step nobody else does. It finds the ink, crops to it, and then tells you what percentage of the frame your signature actually occupies. Under 80% it says so.

Getting ABOVE the minimum is the hard part

This one surprises people, and it is the opposite of every other size problem on this site.

A cleaned signature is essentially two-tone line art — a few dark strokes on flat white. That is the most compressible input JPEG will ever be handed. A 600px-wide signature routinely encodes to 6 or 7 KB at high quality, and a portal with a 10 KB floor rejects it.

Turning quality up barely moves it, because there is almost no detail to preserve. The only lever that reliably adds bytes without making anything look worse is adding pixels, so when the file lands under the floor this tool enlarges the image rather than degrading it.

If you have read "compress it as small as you can" anywhere, that advice fails here in the same way it fails for New Zealand's 512 KB minimum.

The paper is never actually white

A phone photo of paper is grey, slightly yellow under indoor light, and darker on one side than the other. Portals want ink on white.

The cleaning pass lifts everything near paper-tone to pure white and deepens the ink, while keeping the soft edge of the stroke in between. That last part matters: a hard black-and-white threshold produces jagged, photocopied-looking strokes and throws away pen pressure. The result should still look like handwriting.

⛔ There is no SSC photograph mode here, deliberately

Every coaching site and exam-photo vendor publishes the same line: SSC photograph, 20–50 KB, 3.5 × 4.5 cm.

The official Notice of Examination for CHSL 2026 says something different. §9.4: the candidate "is not required to have a pre-existing photograph" — the application module captures one through your camera as you fill the form. §9.5: "In no case should the candidate capture the photographs of his/her pre-existing photograph. All such applications where the photographs of his/her pre-existing photograph is captured will be rejected."

There is no photo upload, which is exactly why the notice states no KB figure for one. Anyone who resizes an old photo to 20–50 KB and holds it up to the webcam is doing the specific thing that causes rejection.

So this tool will not offer to do it. The signature is uploaded and has a real, stated spec; the photograph is not.

What this does not do

It does not create a signature. It resizes and cleans a photograph of one you actually signed.
It does not remove lined paper reliably. Rules are ink as far as any tool is concerned. Sign on plain white paper.
It does not make a transparent PNG. Portals that accept signatures want JPEG on white, which is what you get.
It does not open HEIC. Convert an iPhone photo with HEIC to JPG first.

This tool runs entirely inside your browser. Your file is never uploaded — it never leaves your device, so there is nothing for us or anyone else to read, store or leak.

Common questions

Why does my signature get rejected when the file size is correct?

Almost always because it is too small inside its box. SSC lists "miniature signatures" as the main reason signatures are rejected. If you sign in the corner of a sheet of A4 and photograph the whole page, the file can be exactly the right pixel size and exactly the right number of kilobytes while the actual ink covers about four percent of it. Nothing else measures this, so nothing else warns you. This tool crops to the ink and then tells you the percentage.

Why is it hard to get ABOVE 10 KB rather than under 20?

Because a cleaned signature is two-tone line art, which is the most compressible thing JPEG will ever be given. A 600 pixel wide signature often encodes to six or seven kilobytes even at high quality, and a portal with a 10 KB minimum rejects it. Raising quality barely helps. The only reliable way to add bytes without degrading anything is to add pixels, so when the file is under the floor this tool enlarges the image rather than lowering quality.

What size does SSC actually require for a signature?

JPEG at 10 to 20 KB. That KB range is stated consistently in the official Notice of Examination. The dimension is not consistent: the same notice says 6.0 by 2.0 cm in two places and 4.0 by 2.0 cm in a third. Because the document contradicts itself, this tool does not assert a pixel size for it - it offers a shape and lets you choose. The KB range is what the upload form enforces.

Can I use this for my SSC photograph too?

No, and you should not use any tool for that. The official CHSL 2026 notice says at 9.4 that a candidate is not required to have a pre-existing photograph, because the application captures one live through your camera, and at 9.5 that applications where a pre-existing photograph was captured will be rejected. Coaching sites and photo vendors still publish "resize your SSC photo to 20 to 50 KB". Following that advice and holding an old photo up to the webcam is specifically the thing that causes rejection. The signature is different: it genuinely is uploaded.

Should I sign on white paper or use a black pen on lined paper?

Plain unlined white paper and a dark pen. Lined paper is the most common avoidable problem: the rules are ink too, so the crop includes them and the cleaning pass may keep them. A blue or black ballpoint or gel pen on white gives the cleanest separation. Photograph it straight on in even light rather than at an angle under a lamp, which casts a gradient across the page that makes half the paper darker than the ink on the other half.

Is my signature uploaded anywhere?

No. The image is decoded, cropped, cleaned and re-encoded by your own browser, and the file you download is produced on your device. A signature is a sensitive thing to hand to a stranger’s server, which is a large part of why this tool works the way it does.