Why exam portals reject perfectly good files
Indian government exam portals — SSC, IBPS, UPSC, NEET, JEE and the rest — specify the photograph and signature down to the pixel and the kilobyte. Get any part of it wrong and the upload fails, usually with an error message that does not tell you which part was wrong.
The detail that catches most people is that the file size is arange, not a ceiling. A form asking for 10 to 20 KB will reject a 4 KB file exactly as firmly as a 40 KB one. Ordinary compression tools only aim at the maximum, and a small line drawing like a signature compresses so efficiently that it sails straight past the minimum. This tool targets the range and tells you whether the result landed inside it.
Common requirements
| Exam | Photograph | Signature |
|---|---|---|
| SSC / IBPS | 200×230 px, 20–50 KB | 140×60 px, 10–20 KB |
| UPSC | 400×400 px, 20–300 KB | 350–500 px wide, 20–100 KB |
| JEE Main | 3.5×4.5 cm, 10–200 KB | 3.5×1.5 cm, 10–100 KB |
| NEET | 3.5×4.5 cm, 10–200 KB | 3–30 KB |
Treat that table as a starting point rather than gospel. These figures are restated in every notification and do change between cycles, sometimes without much announcement. Always check the notification for the exam you are actually applying to, and use the custom option if it differs.
Cleaning up a photographed signature
Sign in black ink on plain white paper, then photograph or scan it. A phone photo will pick up a grey cast, the texture of the paper and soft shadows from your hand — none of which belong in the uploaded file.
Clean up ink fixes that by separating the image into pure black and pure white at a brightness cut-off you control. Slide it down if strokes are breaking up, up if the background still looks grey. The result is a crisp signature that also compresses predictably, which makes hitting the KB range easier.
Why this works for signatures but not photographs
A signature is high-contrast line art: dark ink on light paper, with a clean boundary between the two. A simple brightness cut-off separates them reliably. A photograph of a face is continuous tone with no such boundary, so the same technique would destroy it — which is why the cleanup is offered for signatures and not for photographs, rather than being applied blindly to everything.
Practical points that cause rejections
- Sign in black ink. Several notifications explicitly reject blue.
- Do not sign in capital letters — this is rejected outright by some exams.
- Save as
.jpg. A few older portals are strict and will not take.jpegor.png. - Check you are uploading the signature into the signature field, not the photo field. It happens more than you would think.
- Some exams require the photograph to carry a printed date, or the signature to sit within a drawn box. Read the notification.
Nothing is uploaded
Everything here runs inside your browser. That matters more than usual for this particular tool: your signature is a legal identifier, and uploading an image of it to an unknown server — which is what every server-based resizer requires — is a genuinely bad idea. Nothing you drop here leaves your device.