Signature 10 to 100 KB — the NTA and UPSC range
NTA and UPSC allow up to 100 KB for the signature — here, keeping the signature clear matters more than shrinking the file.
Signature 10-100 KB specification
| Requirement | Value |
|---|---|
| NEET (UG) | Signature 10-100 KB, JPG/JPEG, clearly legible |
| JEE Main | Signature 10-100 KB, JPG/JPEG, clearly legible |
| UPSC | Signature 20-100 KB on the uploading sheet, between 350 and 500 pixels, black pen on clean white paper, file named signature |
| CUET | Only 10-50 KB — do not reuse a 90 KB NTA signature here |
| Dimensions for NTA | No pixel size is published for NEET or JEE Main signatures |
| Practical size | A 500 x 170 px crop at high quality lands around 25-40 KB, comfortably inside the range |
Source: Information Bulletin — NEET (UG) 2026, National Testing Agency (NEET (UG) 2026). checked on 2026-09-06. Inside the same bulletin the finger and thumb impression file size is given twice: 10-200 KB in the scanned-image table and 50-300 KB later in the text.
A rare case where you should not compress hard
Most signature specs in India are tight. The NTA exams are not: NEET and JEE Main both allow 10 to 100 KB and ask only that the signature be clearly legible. UPSC's uploading sheet allows 20-100 KB and adds a size range of 350 to 500 pixels.
The floor is the real constraint
With a ceiling that high, nobody fails for being too big. People fail for being too small: a tightly cropped thin-pen signature at 300 px wide can compress to 6 KB, under both the NTA and UPSC minimums. That is why the tool on this page takes a minimum as well as a maximum and tells you when it has padded a file to clear the floor.
Watch the exam-to-exam differences
CUET, from the same agency, stops at 50 KB. UPSC additionally requires black pen on clean white paper and insists the file be named signature. So while one good scan can serve several applications, check each portal's own line before you reuse it — the sizes look similar right up to the moment one of them rejects your file.
How it works
- Sign on clean white paper with a black pen, large enough to read at a glance.
- Scan or photograph the paper in flat, even light.
- Crop tight to the ink, keeping the natural landscape shape.
- Resize to roughly 500 x 170 px, or 350-500 px if you are applying to UPSC.
- Export as JPG between 10 and 100 KB — 30-40 KB is a good target.
- Rename the file to signature.jpg where the portal asks for specific names.