Signature Size for Online Forms: The 60×20mm Standard, Explained

The signature box on Indian online forms is surprisingly standardized — and surprisingly strict. Exam portals (SSC, UPSC, banking and insurance recruitment) almost universally want your signature scanned into a tiny file: typically around 60 × 20 mm at 300 DPI, under 10–20 KB. Here is the spec, the math, and how to produce one without owning a scanner.

The standard sizes

File-size limits are the other half of the spec: signatures are usually capped at 10–20 KB. A signature is mostly flat white with thin strokes, so it compresses extremely well — the challenge is keeping the strokes crisp at those sizes, which is why a clean 300 DPI source matters more than pixel count.

Rules that get signatures rejected

• Photographing the signature at an angle — perspective makes strokes thin and uneven; validators and exam hall staff both compare it against your live signature.
• Signatures that overflow the box — strokes touching the border crop badly after resizing.
• Wrong ink colour — most forms specify black or blue-black ink on white; a few accept blue. Check the notification.
• Inconsistent versions — use one master signature across every form; exam verification compares them later.

Option A: draw it digitally (no scanner needed)

The DevBench Signature Maker lets you draw with a mouse, trackpad, or finger, with stroke smoothing — or type it in a handwriting font if you prefer a clean look. The size presets are exact at 300 DPI: Standard 60×20mm = 709 × 236 px, Compact 50×20mm, Narrow 70×15mm, plus a custom option for portal-specific pixel counts. It trims the transparent margin by default (so no wasted white space pushes strokes out of frame) and exports a transparent PNG. Everything runs in the browser — your signature is not a document you want sitting on a stranger’s server.

Option B: scan a paper signature properly

1. Sign once on plain white paper with a pen you actually use. Do it in one take — pick the version with even pressure.
2. Scan or photograph it straight on, at 300 DPI or higher, filling the frame horizontally.
3. Crop tightly with the Crop tool, leaving a small even margin.
4. Compress to the portal limit with Compress to Exact Size — target 10 or 15 KB.

For offline forms that need photo and signature together on one page, build the sheet with Image to PDF. Related reading: the passport photo size guide covers the other half of every form, and the specs cheat sheet lists the numbers per portal.