Correct Photo & Signature Size for Aadhaar, PAN, and Exam Forms

Every Indian government portal and exam form has its own photo and signature size requirements — and they're rarely the same. UIDAI has different specs from NSDL. NTA has different specs from SSC. And the error messages you get when you upload the wrong size are often vague enough that you can't tell whether the problem is the file size (KB), the pixel dimensions, or the format.

This article consolidates the specifications for the most common portals and exams, explains what each requirement means, and walks through how to get your photo and signature files exactly right the first time.

Quick reference table

Note: Specifications are updated periodically by portals. Always cross-check with the official notification or the upload page instructions for the specific recruitment cycle you're applying to.

Understanding what the requirements actually mean

Physical size (cm) vs pixel dimensions vs file size (KB)

These are three different things that portals use interchangeably — confusingly so. When a portal says "3.5×4.5 cm", it's specifying the physical print size. At a standard screen resolution of 96 DPI, 3.5 cm is about 132 pixels wide and 4.5 cm is about 170 pixels tall. At 200 DPI (higher resolution), those same 3.5×4.5 cm become 276×354 pixels.

The file size in KB is a separate constraint. A 132×170 pixel JPEG at 80% quality is typically 10–20KB. A 276×354 pixel JPEG at the same quality is 30–60KB. This is why most government portals require photos in a range (e.g., 20–50KB) rather than specifying exact pixel dimensions — they're giving you room to work at various resolutions as long as the file size stays in range.

Photo background requirements

Almost all Indian government forms require a white or off-white background with a recent passport-style photograph. Coloured backgrounds, patterns, or outdoor backgrounds are typically rejected at the review stage even if they pass the automated upload check. If your photo has a non-white background, use the OurTools Background Remover to remove it, then set a white background in the image editor before using it for official forms.

Signature on white background

Signatures must be on a plain white background. Sign in black ink on white paper, photograph or scan it, then crop tightly to just the signature with some white border. Use the OurTools Cropper to trim precisely. The photo of the signature should have no shadows, no lines, and no visible paper texture if possible.

How to prepare your photo correctly

Step 1: Take or select the right photo

You need a recent, clear frontal photo with direct eye contact, neutral expression, no sunglasses, no hat, no heavy filter. Light should be even — outdoors in shade or near a window usually gives better results than artificial indoor lighting, which can create yellow casts. The face should occupy 70–80% of the frame vertically.

Step 2: Crop to a portrait ratio

Standard government photos are slightly taller than wide (3.5×4.5 cm is an approximately 4:5 width-to-height ratio). Use the OurTools Cropper to crop to this ratio. Crop tightly — forehead to chin — with a little space above the head and below the chin. Cut out as much background as possible without clipping the head or shoulders.

Step 3: Resize to the required pixel dimensions

Use the OurTools Resize Image tool to set the exact pixel dimensions the portal specifies. For IBPS, that's 200×230 pixels for the photo. For SBI, it's 200×200. Enter the dimensions and the tool will resize while maintaining the aspect ratio you set during cropping.

Step 4: Compress to the required file size

After resizing, use the OurTools Image Compressor to bring the file size within the portal's KB limit. For most exam portals that want 20–50KB, start with 75–80% JPEG quality. The compressed file should look clear and sharp — if it looks pixelated or blurry, the original photo resolution was too low.

Preparing your signature

The process for signatures is similar, with a few differences:

• Sign in black or dark blue ink on plain white paper. Ballpoint pen works better than gel pen for scans — gel can look very thick and may lose fine detail in compression.
• Use good lighting when photographing the signature. No shadows across the signature.
• Crop to just the signature with a small white border (3–5mm on each side). The crop ratio should be approximately 3:1 wide-to-tall for most portals (3.5×1.5 cm ratio).
• Resize to the required pixel dimensions (for SSC: about 132×57 pixels for 3.5×1.5 cm at 96 DPI).
• Compress to within the required KB range. Signatures at small dimensions are usually 5–15KB at 80% JPEG quality.

Passport photos specifically

Indian passport photos have stricter requirements than most exam forms:

• 51×51 mm (square format, not the rectangular 3.5×4.5 cm used for exams)
• White background — specifically white, not off-white or cream
• Face must occupy at least 70–80% of the frame
• No shadows on face or background
• Eyes must be open and clearly visible
• Mouth closed, neutral or slight smile

The Passport Seva online portal accepts files up to 1MB, so file size is rarely the issue for passport photos — the quality requirements are more demanding than the size limits. Use the OurTools Passport Photo tool to crop and format passport photos to the correct specifications automatically.

When the portal says "invalid file" even though specs look right

A few things to check if the upload fails despite meeting the stated requirements:

• Color mode: Some portals reject grayscale or CMYK images. Make sure the image is in RGB colour mode.
• EXIF metadata: Some older portals have issues with JPEG files containing GPS or orientation metadata. Compressing with a tool that strips metadata (most do) usually fixes this.
• Progressive JPEG vs baseline JPEG: Progressive JPEGs load in stages (you see a blurry image that sharpens). Some old government systems reject progressive JPEGs. Most compression tools output baseline JPEG by default, which is compatible everywhere.
• File extension: The file must be saved as .jpg or .jpeg (lowercase), not .JPG or .JPEG — some portals are case-sensitive about extensions.

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