RRB NTPC document requirements

Which RRB NTPC notice this is based on

The Railway Recruitment Boards last advertised NTPC posts under two notices: CEN 06/2025 for Graduate posts and CEN 07/2025 for Under Graduate posts. No newer NTPC notice had appeared by 2 Oct 2026, so the upload rules on this page come from para 14.5 of those notices. They apply to both levels.

Applications go through the RRB apply portal. The notices themselves are listed on the regional RRB websites, such as RRB Chandigarh, and the PDF opens after you visit the site. When a fresh NTPC notice is released, read its document-upload section before trusting any figure here, because the KB ranges or the photo process may be different.

Your photo is captured live, so dress for it

Railway applicants do not upload a photograph file. The photo is captured live through a webcam or a phone camera. According to the notice, you should wear dark clothes and no cap, mask or glasses. Dark clothing helps your outline stand out from a pale background, so a white shirt against a white wall is the outfit to avoid.

Some general advice for a clean capture:

• Choose a quiet spot with soft daylight falling on your face from the front.
• Sit square to the camera with your shoulders level and your hair away from your eyes.
• Close other apps if your phone is slow, so the camera does not freeze mid-capture.
• Keep the device still on a table rather than holding it at arm's length.

What RRB means by a running signature

The signature is the only image you prepare yourself. RRB asks for your running signature, the joined-up way you normally sign, not your name written in block or capital letters. Use black ink on white paper. The scan should be at 100 DPI or more and at least 140 x 60 pixels, and the signature should fit a box of 35 mm x 20 mm. That box is wider than it is tall, so leave little space above and below the ink when you crop.

Use the signature you already put on bank forms and college papers. A signature invented just for the form is hard to repeat exactly when you need it again.

Landing between 30 and 49 KB

RRB's signature window is narrow: the JPG or JPEG file must be at least 30 KB and at most 49 KB. Note the upper limit is 49 KB, not a round number, so even a file slightly above 49 KB will be turned away.

Two problems turn up again and again. A raw phone photo is far heavier than 49 KB. A clean, tightly cropped signature on white paper is the opposite: it can easily come out below 30 KB. A simple order of work handles both:

1. Photograph the signature in good light, holding the phone parallel to the paper.
2. Trim the edges with Crop Image so the shape matches the 35 mm x 20 mm box.
3. Use Image Fit to KB with a 30 to 49 KB target, keeping at least 140 x 60 pixels.
4. If the file still sits under 30 KB, run it through Meet Minimum Size, which adds bytes without changing the picture.
5. Open Portal Preflight for RRB NTPC and confirm it reports the right format and size.

Each of these tools works in your browser. The file is handled on your device and is not uploaded to DocNimble at any point.

The SC/ST certificate for the free travel pass

The only other file in the table above is for SC/ST candidates who request the free sleeper-class travel pass. They upload their SC/ST certificate as a PDF under 400 KB. It must be legible and valid on the closing date of the notice. If your certificate may not meet that, sort it out with the issuing office before you apply rather than after.

For a paper certificate, Scan to PDF turns phone photos into a single PDF with straightened pages. If a colour scan comes out heavier than 400 KB, Compress PDF brings it down. Zoom in afterwards and read the certificate number and the issuing officer's details; if you cannot read them, neither can the person checking your form.

Small mistakes that cost a resubmission

• A signature written in capital letters instead of your running hand.
• Blue ink, or a lined notebook page behind the signature.
• A PNG or HEIC file renamed to .jpg instead of being converted.
• A signature file above 49 KB, or one under 30 KB.
• A travel-pass certificate that is blurred, over 400 KB, or not valid on the closing date.