The Railway Recruitment Board (RRB) Non-Technical Popular Categories (NTPC) exam is notoriously strict when it comes to the online application form. With millions of candidates applying for Station Master, Goods Guard, and Clerk positions, the RRB uses automated software to reject applications with improperly formatted photos or signatures.

To ensure your application is accepted, you must follow the exact pixel, size, and background guidelines listed below.

1. RRB NTPC Photograph Rules

The photograph is the most scrutinized part of the RRB application. A bad photo will lead to a rejected admit card.

• Dimensions: The photo must be exactly 35mm x 45mm (or 320 x 240 pixels).
• File Size: The file size must be strictly between 30 KB and 70 KB.
• Format: Only .jpg or .jpeg formats are allowed.
• Background: The photo must have a white or very light background. Dark backgrounds will be rejected.
• No Glasses or Caps: You must not wear sunglasses, caps, or hats. If you wear prescription glasses, there must be absolutely no glare on the lenses.

2. RRB NTPC Signature Rules

The signature upload has different, specific requirements compared to the photograph. Writing in capital letters is the most common reason for signature rejection.

• Dimensions: The signature box must be 50mm x 20mm (or 140 x 60 pixels).
• File Size: The file size must be between 30 KB and 70 KB.
• Ink: You must sign using a Black or Blue ink pen.
• Running Handwriting: The signature must be in running handwriting. Signatures in all capital/block letters are strictly prohibited and will be rejected.

3. Common Errors and How to Fix Them

If the RRB portal shows an "Invalid File Size" or "Invalid Dimensions" error, it means your photo is either too large (over 70KB) or the aspect ratio is wrong.

Instead of using heavy software like Photoshop, you can use the free tools on ExamPhotoResizer.com. The tools run completely in your browser without uploading your sensitive data to any server, automatically cropping your image to the exact millimeter specifications required by the Railway Board.