What is the file size range for RRB NTPC photo and signature?

Railway Recruitment Board (RRB) requires both candidate photograph and signature files to be strictly between 30 KB and 70 KB in standard JPG/JPEG format. Files smaller than 30 KB or larger than 70 KB will be rejected.

Can I use an old SSC or IBPS signature (10KB–20KB) for RRB?

No. Unlike SSC and IBPS which accept 10KB to 20KB signatures, RRB has a strict 30 KB minimum threshold. Uploading a 15 KB signature will trigger an error stating 'File size below 30 KB'.

What background color is required for RRB railway exam photos?

RRB requires a plain white or light-coloured background. Dark backgrounds, outdoor sceneries, or selfie wallpapers are strictly barred.

Are capital letters permitted for RRB signature?

Signatures in capital block letters (such as 'RAMESH KUMAR') will be rejected immediately. RRB requires natural running handwriting in black or blue ink.

RRB NTPC Photo & Signature Size Rules 2026 (30KB–70KB)

Quick Reference: Railway Recruitment Board (RRB) Upload Specifications

Document	File Size Range	Dimensions	Key Rules
Color Photograph	30 KB – 70 KB	35 mm × 45 mm (320×240 px)	Plain light/white background, taken within 6 months, no cap/goggles
Candidate Signature	30 KB – 70 KB	50 mm × 20 mm	Running cursive hand, blue/black ink, plain white unruled paper
SC/ST Certificate (PDF)	100 KB – 300 KB	Standard A4 Document	Required for free railway pass eligibility, clean readable PDF

Targeting the exact 30KB–70KB railway range? Open our instant, client-side RRB NTPC Photo & Signature Compressor.

With tens of millions of aspirants applying for central railway recruitments across India—such as RRB NTPC (Non-Technical Popular Categories), RRB Group D (Level-1), Assistant Loco Pilot (ALP), and Technician—the Railway Recruitment Control Board enforces automated image filter rules on its centralized registration portal (rrbapply.gov.in).

Historically, hundreds of thousands of railway exam applications have been rejected due to invalid photo and signature uploads. What makes RRB particularly unique compared to other government exams in India is its unusual minimum file size requirement.

1. The “30 KB Minimum” Trap: Why Standard Tools Fail

Most government job aspirants frequently compress their photos and signatures for SSC (Staff Selection Commission) or IBPS (Banking) portals, which mandate a signature size of 10 KB to 20 KB and photos between 20 KB and 50 KB.

However, when you attempt to reuse that same 15 KB signature file on the RRB portal, the upload script fails immediately with an error:

ERROR: "Candidate signature file size must be between 30 KB and 70 KB only."

Because modern image compressors indiscriminately crush files down to 10 KB or 15 KB, candidates find themselves unable to upload their documents. ToolKB specifically solves this by letting you dial in an exact 50 KB target (safely positioned right inside RRB’s 30KB–70KB bracket) with high-fidelity detail preservation.

2. Railway Photograph Specifications (35mm × 45mm)

Recency: The photo must have been taken within the last 6 months from the notification release date. Reusing photos from prior recruitments with altered facial appearance is a ground for disqualification during Document Verification (DV).
Background: Plain white or light-coloured background is mandatory. Avoid studio gradient backdrops, wallpaper, or natural outdoor trees.
Full Facial Visibility: Direct front-facing eye contact with a neutral expression. Both ears must be clearly visible. Hair must not cover the forehead or eyes.
Spectacles: If you wear corrective glasses, ensure zero reflection, glare, or flash bounce on the glass. Tinted glasses or sunglasses are strictly banned.
Cap / Headgear: Caps and hats are disallowed. Religious head coverings are accepted provided the face is entirely visible from hairline to chin.

3. RRB Candidate Signature Rules

The signature must be executed with precision:

Box Boundary: Draw a 50mm × 20mm box on an unruled, bright white sheet of paper.
Pen Type: Use a clear black or dark blue ink pen. Faint gel pens or pencil signatures will be rejected due to low optical density.
Running Hand Only: Do not write your name in CAPITAL BLOCK LETTERS. An upload reading “VIKRAM SINGH” will lead to instant application cancellation.
File Size: 30 KB to 70 KB in JPG/JPEG format.

4. Step-by-Step: Resize and Compress for RRB on Mobile

Snap a clean photo of your portrait against a light wall, and your signature on plain white paper.
Crop away background clutter using our Free Crop Image Tool.
Open the dedicated RRB NTPC Resizer Tool or our 50KB Photo Compressor.
The tool automatically sets the target to 50KB—dead center within the required 30KB–70KB range.
Download the generated JPG file and upload directly to rrbapply.gov.in.

Top 4 Rejection Mistakes in Railway Applications

Mistake 1: File size below 30 KB. Ensure you don't use overly compressed SSC signature files.

Mistake 2: Submitting a selfie. The perspective distortion of wide-angle mobile front cameras alters facial ratios, leading to biometric rejection at the CBT center.

Mistake 3: Shadow on the face or background. Ensure soft, diffused front lighting when capturing the photo.

Mistake 4: Uploading PNG or PDF instead of JPG. The photo and signature must be in .jpg or .jpeg format only.

RRB Railway Exam Photo & Signature Rules: Accepted File Size, Dimensions & Mistakes