Which pen colour should I use for my signature?

Black or dark blue ink on white paper is what notices commonly ask for. Black usually scans with the best contrast.

Can I sign in capital letters?

Many notices, for example UPSC's, say signatures in capital letters will not be accepted. Use your regular running signature.

Can I take a photo of my signature with my phone?

Yes. Use bright, even light, hold the phone parallel to the paper, avoid shadows and flash, and crop tightly afterwards.

My signature is under the minimum KB. What do I do?

Raise the JPEG quality or slightly increase the pixel dimensions within the allowed range. A very clean white background compresses extremely well, so this is common.

Can I draw my signature on the phone screen?

Unless the notice allows it, use a pen-on-paper signature. Finger-drawn signatures often look different from your real one, which can cause problems at verification.

How to prepare your signature for online application forms

Updated 11 October 2026

Signature resizer →

A signature looks like the easiest upload on a form, yet it is a frequent cause of rejection. Faint ink, a crumpled background, cut-off strokes or a signature in capital letters can all lead to trouble at the application or document verification stage. Here is how to do it properly.

Step 1: sign on the right paper with the right pen

Use plain white paper, with no lines or grid. A clean A4 sheet is ideal.
Use a black or dark blue pen, as notices commonly ask. A gel pen or a fine felt-tip gives a firm, even line. Ballpoint pens can leave faint gaps.
Sign at your normal size, not tiny. A signature about 5 to 7 cm wide scans well.
Sign a few times in separate places and pick the best one.
Use your real, regular signature, the same one you will use on the answer sheet and attendance sheet.

Why capital-letter signatures are a problem

Many notices, for example UPSC's, say that a signature written in CAPITAL letters will not be accepted. The reasoning is that block capitals are easy for anyone to copy and do not identify a person. If you have always signed in capitals, it is worth adopting a proper running signature well before you start applying, and using it consistently on all documents. Similarly, do not just print your name in neat handwriting; that is not a signature.

Notices also commonly reject signatures signed by someone else, and some forms check that the signature on exam day matches the uploaded one.

Step 2: capture the signature

Scanner: scan at 200 or 300 DPI in colour or greyscale. Save as JPG.

Phone camera: place the paper on a flat surface in bright, even daylight. Hold the phone directly above, parallel to the paper, so the signature is not slanted. Avoid your own shadow falling on the page. Turn off the flash, which causes a bright spot. Tap to focus on the signature.

Step 3: crop tightly

Crop so the signature fills most of the image, leaving only a small white margin around it. A large empty page with a small signature in one corner is a common reason for a signature to look unreadable after resizing. Make sure no part of a stroke is cut off.

Step 4: improve contrast

A phone photo of white paper often looks grey or yellowish. Increasing contrast makes the paper white and the ink dark, which also reduces file size because a plain white background compresses very well. Our signature tool has a clean-up option that whitens the background and darkens the ink. Do not make the strokes so thin that they break up, and do not thicken them so much that the letters merge.

Step 5: resize to the required size

Signature dimensions are commonly asked in pixels (for example 140 × 60 px) or in cm (for example 3.5 × 1.5 cm). The file size limit is usually small, often in the 10 to 20 KB range or lower. Always follow your notice; our exams page lists sizes for popular exams.

Worked example

The notice asks for a signature of 3.5 × 1.5 cm at 200 DPI, between 10 and 20 KB, in JPG.

3.5 ÷ 2.54 × 200 = 275.6, so the width is 276 px.
1.5 ÷ 2.54 × 200 = 118.1, so the height is 118 px.
Crop your scan to the 3.5 : 1.5 shape (about 2.33 : 1). A scan cropped to 1400 × 600 px fits this shape exactly.
Resize to 276 × 118 px. With a clean white background this is typically 8 to 15 KB at good quality.
If the result is under 10 KB, raise the quality slightly; if above 20 KB, lower it.

If the image is too small in KB even at maximum quality (common with very clean signatures), increase the pixel dimensions slightly within what the notice allows, or keep a little more of the paper's natural texture.

Common mistakes

Mistake	Fix
Signature on lined or coloured paper	Sign again on plain white paper
Faint pencil or light blue ink	Use black or dark blue pen
Signature in capital letters	Use your regular running signature
Too much blank space around it	Crop tightly before resizing
Stretched or squashed look	Crop to the right shape first, then resize
Uploaded photo in the signature box	Check which file goes in which field before submitting

Some forms also ask for a thumb impression or a handwritten declaration; see our thumb impression guide.

Questions people ask

Which pen colour should I use for my signature?: Black or dark blue ink on white paper is what notices commonly ask for. Black usually scans with the best contrast.
Can I sign in capital letters?: Many notices, for example UPSC's, say signatures in capital letters will not be accepted. Use your regular running signature.
Can I take a photo of my signature with my phone?: Yes. Use bright, even light, hold the phone parallel to the paper, avoid shadows and flash, and crop tightly afterwards.
My signature is under the minimum KB. What do I do?: Raise the JPEG quality or slightly increase the pixel dimensions within the allowed range. A very clean white background compresses extremely well, so this is common.
Can I draw my signature on the phone screen?: Unless the notice allows it, use a pen-on-paper signature. Finger-drawn signatures often look different from your real one, which can cause problems at verification.