Your PAN card signature must be a JPEG file under 20 KB with a white background. Both NSDL and UTI reject signatures larger than 20 KB or in PNG/PDF format. A fresh photo of your signature taken on a smartphone is typically 300 KB to 1.5 MB — it always needs to be compressed before upload.
Use the free signature resize tool for PAN card to compress your signature to the correct size in your browser. Your file is never uploaded to any server.
Signature Requirements for NSDL and UTI
| Requirement | NSDL | UTI |
|---|---|---|
| File format | JPEG / JPG | JPEG / JPG |
| Maximum file size | 20 KB | 20 KB |
| Background | White | White |
| Ink colour | Black or dark blue | Black or dark blue |
Step-by-Step: How to Get Your Signature Under 20 KB
Step 1 — Sign on plain white paper
Use a blank white A4 printing sheet — not a ruled notebook page. Lined paper leaves visible horizontal marks in the scanned image, which causes rejection. Use a black or dark blue ballpoint pen. Sign at roughly the same size you would on a cheque — about 6 to 8 cm wide.
Step 2 — Photograph or scan it
Place the paper on a flat surface. Hold your phone directly above it with the camera parallel to the paper — avoid tilting, which stretches the signature. Shoot in good natural light. Avoid shadows across the signature. If you have a flatbed scanner, scan at 200 DPI — higher resolution only increases file size without improving legibility on the portal.
Step 3 — Resize using the free tool
- Go to pancardphotoresizer.in and select the Signature tab.
- Upload your signature photo (JPG or PNG accepted).
- The tool compresses and converts it to JPEG under 20 KB automatically.
- Click Download. The file is ready to upload to NSDL or UTI.
Step 4 — Verify the file size before uploading
Right-click the downloaded file → Properties (Windows) or press Cmd+I (Mac). Confirm the size is under 20 KB. If the tool produced the file, it will be — but this takes 3 seconds and prevents a failed upload.
Why Signature Files Are Harder to Compress Than Photos
Most people are surprised that the signature limit (20 KB) is tighter than the photo limit (50 KB), even though a signature seems simpler. The reason is how JPEG compression works.
JPEG is highly efficient on smooth gradients — skin tones, sky, blurred backgrounds. It stores these areas with very little data. But a signature on white paper is the opposite: hard, high-contrast black edges against a uniform background. JPEG handles sharp edges poorly and encodes them with significantly more data than it uses for smooth areas. A signature scanned at moderate resolution can easily reach 150–400 KB even though it contains far less visual information than a portrait photo.
This is also why the background matters so much. A pure white background (#ffffff) compresses extremely efficiently in JPEG because the compression algorithm can represent large uniform areas with minimal data. A cream-tinted paper, a shadow, or ruled lines all add high-frequency variation that increases file size — sometimes enough to push a borderline signature over 20 KB even after compression.
Common Reasons Your Signature Gets Rejected
Ruled or lined background. The most common cause. Even faint blue lines from notebook paper are visible in the digital image and cause rejection. Always use plain white printer paper.
Wrong format. Screenshots on iPhone save as PNG. Android screenshots save as PNG or WebP. If you screenshot your signature rather than photographing the paper directly, the resulting file is often in the wrong format and too large. The resize tool converts to JPEG regardless of input format.
Shadow across the signature. A hand shadow while photographing creates a grey band that makes the background non-white. The portal’s background check fails. Photograph in indirect natural light with the phone held high enough above the paper that your hand doesn’t shadow the sheet.
Signature too light or faint. Gel pens and light ink produce signatures that scan poorly — fine strokes become invisible at compression. Use a ballpoint pen with dark ink and apply consistent pressure throughout the signature.
File renamed but not converted. Saving a PNG as signature.jpg changes the filename but not the actual format. The portal reads the file header, not the filename extension, and rejects it. Always use a tool that genuinely converts to JPEG, not just renames the file.
Frequently Asked Questions
What is the exact signature size for PAN card in KB?
Your PAN card signature must be under 20 KB in JPEG (JPG) format. This applies to both NSDL (onlineservices.nsdl.com) and UTI (utiitsl.com). There is no minimum size — a file of 5 KB or 15 KB is equally acceptable as long as the signature is clearly legible.
Can I use a digital signature for PAN card upload?
No. NSDL and UTI require a physical signature — your handwritten signature on white paper, photographed or scanned. A digital signature (typed text, stylus drawing on screen, or an image of a stamp) is not accepted. The signature must match what you use on official documents.
My signature file is 22 KB after compression — what should I do?
Upload it to signature resizer. The tool targets under 20 KB. If the output is still slightly over, it usually means the signature photo has a non-white background (shadows, tinted paper) adding data. Retake the photo on plain white paper in better light and try again.
Can I use the same resized signature for both NSDL and UTI?
Yes. Both portals use identical signature requirements — JPEG, under 20 KB, white background. A file that passes one portal will pass the other without any changes.
Does the signature need to be within a specific box or frame?
No specific framing is required for the digital upload. Sign on plain paper, photograph the signature with a small white margin around it, and upload. The portal does not enforce a pixel crop area — it checks format, file size, and background colour only.
