Resize Signature Image — for Exam Form Uploads

There is no single answer, and that is the whole problem — each board publishes its own band. Banking portals ask for 140 × 60 px at up to 20 KB, SSC and the railways for a 3.5 × 1.5 cm strip at 10–20 KB, JEE and NEET for the same strip at 4–30 KB, and UPSC for three signatures in one image at 20–100 KB. Find your own exam in the table above before you resize anything, because a file built for one is rejected by another.

Because a signature is mostly blank white paper, which compresses to almost nothing. We measured a clean scan of a thin-pen signature at 413 × 177 px and it encoded to 1.9 KB, well under the 10 KB floor SSC asks for. A phone photograph of the same page came out at 49.3 KB, because the paper texture and lighting give JPEG real detail to store. If your file is under the minimum, rescan at a higher DPI or photograph the page instead — compressing cannot add detail back, so no amount of resizing upward will fix a file that is genuinely too clean.

That is our conversion, not a figure any board publishes. The exam notifications state the strip in centimeters, and 3.5 × 1.5 cm at 300 DPI works out to 413 × 177 px using pixels = cm × DPI ÷ 2.54. We use 300 DPI because it is the print standard, and every guide that quotes a pixel count for these forms is doing the same arithmetic. If your notification prints its own pixel figure, use that one instead of ours.

UPSC asks for three signatures stacked vertically inside one image, so it is tall rather than wide. Every other board on this page wants a single signature in a wide strip. Submitting the wide strip where UPSC expects three signatures, or the stacked image where SSC expects the strip, is a rejection on shape alone — which is why the two presets are labeled to stay distinguishable rather than both being called "signature".

White. Signature uploads are the one requirement where the background is consistent across every portal we have checked — unlike photographs, where the United States requires plain white, France explicitly forbids it, and Indonesia asks for red. Sign in black or dark blue ink on plain white paper and scan or photograph it square-on, without a shadow falling across the page.

Yes. The resizer runs entirely in your browser, including on a phone, and nothing is uploaded to a server at any point — your signature never leaves your device. That matters more for a signature than for an ordinary photo, since a signature is a specimen of something you use to authorize documents.

JPG, for these forms. Every band on this page is a JPEG size limit, and PNG cannot be compressed to a KB target at all — its compression is lossless, so there is no quality dial to turn. Our presets output JPEG for exactly this reason. Keep the original scan too, at full size, because you will need it again for the next form with a different band.

These are exact required dimensions rather than a proportional resize, so applying a preset clears the aspect-ratio lock and the output really is 413 × 177 px even if your scan was not that shape. Crop the scan to roughly the right proportions first — a tight rectangle around the signature itself, not the whole page — and then apply the preset. Our crop tool does the first step.