Scan or photograph your signature, pick your exam, and get a file that matches both the dimension rule and the KB range in one step.
Signature uploads fail more often than photographs, because the rules are tighter. A typical form wants a strip roughly three times wider than it is tall, between 10KB and 20KB, in JPG. Miss any of the three and the portal throws it back.
How to get a clean signature image in the first place
- Sign in black or dark blue ink on plain white unlined paper. Blue is safer — it reads as clearly original.
- Sign inside a box roughly 6cm wide by 2cm tall, which is the ratio most forms expect.
- Photograph it in daylight, flat on, with the paper filling the frame. Avoid shadows from your own hand.
- Crop tight to the ink. Wide white margins push the size ratio out and waste your KB budget.
- Run it through the tool above and pick your exam.
Never upload a signature drawn with a finger on a touchscreen. Several boards treat it as a mismatch against the one you write at the exam centre, and that is a rejection at verification, not at upload.
Signature sizes by exam
Commonly requested values, gathered from recent notifications. Confirm against the PDF for your own cycle before you upload — these do change.
| Exam / form | Dimensions | File size |
|---|---|---|
| SSC (CGL, CHSL, MTS) | 6.0 × 2.0 cm | 10–20 KB |
| RRB / NTPC / Group D | 4.5 × 1.5 cm | 10–40 KB |
| India Post GDS | 6.0 × 2.0 cm | 10–20 KB |
| GATE | 250 × 80 px | 5–200 KB |
| PAN card (NSDL / UTI) | 2.0 × 4.5 cm | 10–20 KB |
| UPSC | 6.0 × 2.0 cm | 20–300 KB |
| NEET / NTA | 6.0 × 2.0 cm | 4–30 KB |
The three errors that cause most rejections
- “Signature size should be between 10KB and 20KB”. A phone photo is usually 2–4MB. Pick your exam above and the tool lands inside the band automatically — or use the 10 to 20KB preset directly.
- “Invalid dimensions”. Your crop is the wrong shape. A signature must be a wide strip; a square crop fails even at the right file size.
- “File too small”. You compressed it too hard on a previous attempt. Increase it back up rather than re-scanning.
Frequently asked questions
How do I resize my signature to 20KB?
Upload the scanned signature, choose your exam or enter 10 to 20KB manually, and download. The tool crops to the right shape and lands inside the KB band in one step.
What size should a signature be for an online form?
Most Indian exam portals want roughly 6cm by 2cm, or about 140 by 60 pixels, saved as JPG between 10KB and 20KB. Some, like GATE, specify pixels directly at 250 by 80. Always check your own notification because the numbers shift between cycles.
Can I resize a signature on my phone?
Yes. Photograph the signature on white paper, open this page in Chrome or Safari, and pick the image from your gallery. The whole process runs on the phone itself.
Why does my signature keep getting rejected?
Usually one of three things: the file size sits outside the allowed band, the crop is the wrong shape, or the ink is too light to register against the background. Sign in dark ink on plain white paper and crop tight to the writing.
What is 140 x 60 pixels for a signature?
It is the pixel equivalent of the classic 6cm by 2cm box at screen resolution, and several older portals state it that way. If your form asks for 140 by 60, the exam presets above produce a matching file.