signatureSignature Tool

Signature Compressor (10-20KB)

Compress your signature to aim under 20KB for SSC, IBPS, UPSC, and Railway applications, then verify whether your portal also requires a minimum such as 10KB.

checklistSignature requirements

File Size

10-20KB

Format

JPG/JPEG only

Dimensions

3.5 cm x 1.5 cm (140 x 60 pixels)

Ink Color

Black or dark blue ink

Background

White only

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Understanding signature file requirements for government exams

Most Indian government exam portals ask for a digital copy of your handwritten signature along with the photograph. Unlike photos, signature files usually have very tight size limits, often between 4KB and 20KB. These files are used for identity checks on admit cards and related documents, so portals usually reject them automatically when the file is too large or the image is unclear.

Signature requirements by examination (2026)

Exam	File Size	Dimensions	Format
SSC CGL / CHSL	10-20 KB	140 x 60 px	JPG
IBPS PO / Clerk	10-20 KB	140 x 60 px	JPG
UPSC CSE / IAS	Up to 300 KB	Varies	JPG
RRB NTPC / Group D	10-20 KB	140 x 60 px	JPG
NTA (NEET / JEE)	4-30 KB	Varies	JPG

How to create a clean digital signature

Sign on clean white paper. Use unlined paper and avoid ruled notebooks.
Use black or dark blue ink. A consistent ballpoint line is usually easier to compress cleanly.
Capture it clearly. Scan it or photograph it in even light from directly above.
Crop tightly. Remove extra whitespace so the file-size budget is spent on the signature itself.
Compress to the exact limit. Use this tool to stay under the portal ceiling while keeping the strokes readable.

Common signature rejection reasons

Using coloured ink instead of black or dark blue
Signing on lined or graph paper
Blurry or low-contrast capture
File size over the portal limit
Uploading PNG instead of JPG or JPEG
Too much whitespace around the signature
Signature not matching the one on your official documents

Frequently asked questions

What is the signature size for SSC exams?

SSC requires signature files between 10KB and 20KB in JPG or JPEG format. Dimensions should be about 3.5 cm x 1.5 cm, or roughly 140 x 60 pixels. Use black or dark blue ink on a white background.

Can I sign on plain paper and scan it?

Yes. Sign with black or dark blue ink on clean white unlined paper. Scan at 200 to 300 DPI, crop tightly around the signature, then use the tool to aim under your portal's KB limit.

Why is my signature getting rejected?

Common reasons are file size over the portal limit, wrong format such as PNG instead of JPG, coloured ink, lined paper, or a blurry scan. This tool helps with the size issue, but the source image still needs to be clean.

Does compressing damage my signature clarity?

At 10KB to 20KB for a tightly cropped signature image, the result is usually clear enough for verification. Start with a sharp crop so the compressor has less noise to preserve.

What is the difference between 10KB and 20KB limits?

Some portals set a minimum of 10KB and a maximum of 20KB. The minimum is meant to prevent blank or unusably small images. If your file drops under 10KB, recapture it with slightly better contrast or a tighter crop.

Can I use a digital signature drawn on screen?

Most government exam portals expect a handwritten signature scanned or photographed from paper. A touchscreen signature can look different from your actual signature and may cause problems during document verification.

How do I make my signature cleaner before compressing?

Use the Signature Cleaner tool to improve contrast and remove grey scan noise first. A cleaner black-on-white image usually compresses more efficiently and stays more readable.

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