Every size, pixel count, DPI and file-size limit for Protean (NSDL) and UTIITSL — plus Aadhaar supporting-document rules — in one place.
Open the Resizer Tool →If you only need the numbers, here they are. Detailed tables and an explanation of each field follow below.
Choose the portal you're applying through. Each tab lists the photo, signature and supporting-document requirements.
| Dimensions | 3.5 × 2.5 cm (197 × 276 px) |
| Orientation | Portrait (vertical) |
| Format | JPEG / JPG |
| Resolution | 200 DPI minimum |
| File size | 20 KB – 50 KB |
| Background | Plain white preferred |
| Face coverage | 70–80% of frame |
| Dimensions | 4.5 × 2 cm (354 × 157 px) |
| Orientation | Landscape (horizontal) |
| Format | JPEG / JPG |
| Resolution | 200 DPI minimum |
| File size | 10 KB – 50 KB |
| Background | Plain white paper |
| Ink colour | Black or blue preferred |
| Required | Front & back, one file |
| Format | PDF (merged images) |
| Resolution | 200 DPI |
| Max size | 300 KB per merged file |
| Both sides | Must be clearly visible |
| Dimensions | 213 × 213 px (square) |
| Orientation | Square |
| Format | JPEG / JPG |
| Resolution | 300 DPI |
| File size | Under 30 KB |
| Background | Plain white preferred |
| Face coverage | 70–80% of frame |
| Dimensions | 400 × 200 px |
| Orientation | Landscape (horizontal) |
| Format | JPEG / JPG |
| Resolution | 600 DPI |
| File size | Under 60 KB |
| Background | Plain white paper |
| Ink colour | Black or blue preferred |
| Required | Front & back, one file |
| Format | PDF (merged images) |
| Resolution | 200 DPI |
| Max size (this tool) | 300 KB per merged file |
| Both sides | Must be clearly visible |
UTIITSL's own guidance allows a larger supporting-document file, but this tool keeps the merged Aadhaar PDF at 300 KB on both portals so the download stays small and consistent.
The portals occasionally revise these limits without much notice — cross-check against onlineservices.nsdl.com or pan.utiitsl.com before you submit.
Both portals issue the same PAN card, but the upload rules aren't interchangeable. A file prepared for one will usually be rejected by the other.
| Requirement | Protean (NSDL) | UTIITSL |
|---|---|---|
| Photo shape | Portrait, 2.5 × 3.5 cm | Square |
| Photo pixels | 197 × 276 | 213 × 213 |
| Photo resolution | 200 DPI | 300 DPI |
| Photo file size | 20 – 50 KB | Under 30 KB |
| Signature pixels | 354 × 157 | 400 × 200 |
| Signature resolution | 200 DPI | 600 DPI |
| Signature file size | 10 – 50 KB | Under 60 KB |
| Supporting document | PDF, 200 DPI | PDF, 200 DPI |
| Image format | JPEG | JPEG |
Portals quote sizes in centimetres, pixels, or both. They're linked by DPI (dots per inch), and one inch is 2.54 cm.
pixels = cm ÷ 2.54 × DPI
For example, 3.5 cm at 200 DPI is 3.5 ÷ 2.54 × 200 ≈ 275.6, which rounds to 276 pixels.
| 2.5 cm (photo width) | ≈ 197 px |
| 3.5 cm (photo height) | ≈ 276 px |
| 4.5 cm (signature width) | ≈ 354 px |
| 2.0 cm (signature height) | ≈ 157 px |
DPI is a value stored in the JPEG header. It doesn't change how the picture looks on screen, but portals read it as a check on the intended print size. This tool writes the correct DPI into the file for the portal you select, so you don't have to rely on your camera app.
Skip the manual maths. These free tools run entirely in your browser — nothing is uploaded.
Crop, resize and tune file size to the exact NSDL or UTIITSL limits, with DPI set automatically.
Open tool →Combine both sides of your Aadhaar into a single PDF for the supporting-document upload.
Open tool →Shrink an existing PDF to meet the portal's supporting-document size limit.
Open tool →Replace a busy background with plain white so your photo passes the portal's checks.
Open tool →Clean up a scanned signature so only the ink remains on a white background.
Open tool →Run through these once your files are ready.
NSDL wants a portrait photo; UTIITSL wants a square one.
Renaming a HEIC or PNG file doesn't convert it — export a real JPEG.
Check the KB value in your file manager before uploading.
No shadows, patterns or other people in the frame.
Black or dark blue on white paper holds up best under compression.
Flat, evenly lit, no glare or shadow across the text.
Upload, crop and download your photo, signature and Aadhaar PDF at exactly these specifications — free and private.
Open the PAN Card Tool →