Bank Exam Signature, Thumb Impression & Declaration Size Guide (IBPS & SBI 2026)

1. The 4 Mandatory Documents for IBPS & SBI Registrations

Every bank exam registration requires four distinct digital files. Here is the official master specifications table compiled from 2026 IBPS and SBI recruitment notifications:

2. Document 1: Candidate Signature (140 × 60 px, 10–20KB)

The IBPS signature check is notorious for strict dimension enforcement. Most photo editing tools alter aspect ratio or leave irregular pixel boundaries.

• Strict Black Ink Requirement: IBPS notifications state clearly that signatures in blue, green, or red ink will be rejected. Use a good quality black ballpoint pen.
• Cursive Handwriting Only: Never write your initials or full name in capital block letters. Sign as you routinely do on bank cheques and identity cards.
• Exact 140 × 60 px Output: Use our IBPS Preset Tool or Signature to 20KB Tool which locks the canvas to exact 140 × 60 pixels.

3. Document 2: Left Thumb Impression (LTI) (240 × 240 px, 20–50KB)

The Left Thumb Impression verifies candidate identity during online prelims and mains entry. Poor impressions cause biometric verification delays at the examination venue.

• Ink Pad: Use a standard blue or black stamp pad. Lightly press your left thumb onto the pad—do not oversaturate with excess ink or ridges will smudge into a solid blob.
• Stamp on Paper: Gently press onto clean white unlined paper. Roll your thumb slightly from left to right to capture complete ridge patterns.
• Square Proportions (1:1): Crop tightly around the oval thumbprint into a square shape. In ToolKB, selecting the "IBPS Left Thumb Impression" preset formats it directly to 240 × 240 pixels at ~35KB.

4. Document 3: Handwritten Declaration (800 × 400 px, 50–100KB)

The handwritten declaration is a legally binding statement verifying that all information supplied in your application is true and complete.

Important Guidelines for Declaration:

• Write in English only. Regional language declarations are invalid.
• Write with a BLACK pen on clean white unruled paper.
• Do not write in capital letters (except your name where appropriate).
• Do not type or print the statement; it must be written in your own natural hand.
• Use our 100KB Compressor to fit the 800 × 400 pixel image between 50KB and 100KB.

5. Why Generic Compressors Fail on Bank Portals

When you submit an image to the IBPS upload server, a backend PHP/Java validator checks:

if ($file_size < 10240 || $file_size > 20480) { reject("Size must be 10KB to 20KB"); }
if ($width != 140 || $height != 60) { reject("Dimensions must be 140 x 60 pixels"); }
if ($mime_type != "image/jpeg") { reject("Format must be JPEG"); }

Notice how strict the logic is. If your file is 20,500 bytes (20.02 KB), or if width is 142 pixels, the server denies the upload. ToolKB was built specifically to adhere to these exact binary boundaries client-side, preventing rejection before you even click submit.

6. Frequently Asked Questions