RRB NTPC Photo and Signature Size 2026: KB, Pixels, Format
For RRB NTPC under CEN 06/2025 (Graduate) and CEN 07/2025 (Undergraduate), you do not upload a photo: it is captured live by webcam or phone front camera. You upload only your signature as a JPG or JPEG between 30KB and 49KB, at least 140x60 pixels, scanned at 100 DPI or more and centred in a 35x20mm box.
FixDoks is an independent website and is not affiliated with any government body, exam board or recruitment agency. Requirements change, so always confirm them in the latest official notification.
For RRB NTPC 2025-26, there is no photo file to upload. Both CEN 06/2025 (Graduate posts) and CEN 07/2025 (Undergraduate posts) capture your photograph live during the application, and the only image you upload is your signature: a JPG or JPEG between 30KB and 49KB, at least 140x60 pixels, scanned at a minimum of 100 DPI.
That changes how you should prepare. Most older guides still tell you to scan a passport photo to a fixed KB range. For the current NTPC notices, spend that effort on a clean signature and on good light for the live photo instead.
| Document | Format | File size (KB) | Dimensions | Other rules |
|---|---|---|---|---|
| Photograph | Live capture | No upload | Taken by webcam or phone front camera | Non-white clothes, camera at eye level, no cap, mask or glasses, eyes fully open |
| Signature | JPG/JPEG only | 30KB to 49KB | At least 140x60px, scanned at 100 DPI or more | Black ink on white paper, running handwriting, centred in a 35x20mm box |
| SC/ST certificate (only for a free rail travel pass) | PDF only | Under 400KB | Not specified | Latest valid certificate as on the closing date |
Source: RRB CEN 06/2025 (NTPC Graduate), paras 14.4 and 14.5, and CEN 07/2025 (NTPC Undergraduate), paras 14.4 and 14.5, read on 26 September 2026. Both notices use the same wording.
Make your signature fit the 30KB to 49KB rule with the RRB signature resizer. It cleans the paper to white, darkens the ink and centres the signature in a 35x20mm frame.
RRB NTPC & Group D Signature Resize
Same settings as the full tool page.
Runs in your browser. Your file never leaves your device. Open the full RRB NTPC & Group D Signature Resize page
The two NTPC notices at a glance
RRB split the NTPC drive into two notices in October 2025. The upload rules are identical, but the posts and dates differ, so check which one you are applying under.
- CEN 06/2025, Graduate posts: 5,810 vacancies (Station Master, Goods Train Manager, Chief Commercial cum Ticket Supervisor, Junior Accounts Assistant cum Typist, Senior Clerk cum Typist, Traffic Assistant). Applications opened on 21.10.2025 and, after Corrigendum 1, closed on 27.11.2025.
- CEN 07/2025, Undergraduate posts: 3,058 vacancies (Commercial cum Ticket Clerk, Accounts Clerk cum Typist, Junior Clerk cum Typist, Trains Clerk). Applications opened on 28.10.2025 and, after Corrigendum 1, closed on 04.12.2025.
Both application windows are closed. As of September 2026, the RRB notice boards show CEN 06/2025 at the aptitude test (CBAT) and typing test (CBTST) stage. If you are preparing for the next NTPC notice, expect the same pattern, but read the new CEN before you rely on any number here.
RRB NTPC signature rules, line by line
The signature is where most NTPC applications get into trouble, because the minimum file size is unusually high. A crisp 12KB scan that SSC or IBPS would accept is too small for RRB.
- Sign yourself, with a black ink pen, on plain white paper.
- Use running (joined, cursive) handwriting. Block, capital or disjointed letters are a stated ground for rejection.
- Scan at 100 DPI or more and save as JPG or JPEG. PNG, HEIC and WebP are not accepted.
- Keep the file between 30KB and 49KB, with the image at least 140 pixels wide and 60 pixels tall.
- The signature must sit in the centre of the 35mm by 20mm scan box on the form, fully visible.
The CEN also lists what gets an application rejected: a non-white background, ink that is not black, block or capital letters, a poor or unclear image, a partly visible signature, a blank image, uploading something other than a signature, or a thumb impression in place of a signature. Your signature at the exam, document verification, medical and appointment must also match the one you upload, so do not invent a neater version just for the form.
If you want to understand why a small, clean file can still be "too small", the guide on pixels vs DPI vs KB explains how the three numbers relate.
How to prepare the signature on your phone
- Sign three or four times on a clean sheet of white paper with a black pen and pick the best one.
- Place the paper on a flat surface near a window and photograph it from straight above, with no shadow from your phone.
- If the phone saves HEIC or WebP, convert it with HEIC to JPG or WebP to JPG first.
- Open the RRB signature resizer, upload the photo and let it trim the margins and whiten the paper.
- Set the ink to black if your photo looks bluish or grey, then download the JPG.
- Check the file size in your file manager: it must read between 30KB and 49KB before you upload it.
For more detail on getting a clean scan without a scanner, see how to scan a signature on your phone.
Getting the live photo right
Paragraph 14.4 of both notices says you are not required to upload a pre-existing photograph. The application module captures one through your webcam or your phone's front camera. The rules are short but strict:
- Wear non-white clothing, preferably dark, so you stand out from the background.
- Keep the camera at eye level, look straight ahead with a neutral expression, and keep your whole face inside the frame shown on screen.
- Do not wear a cap, mask, or glasses or spectacles.
- Keep your eyes fully open, or the photo will not be captured.
- You may preview and retake the photo until you submit the application.
Never point the camera at a printed photo or a photo on another screen. Both NTPC notices say any application with such an image will be summarily rejected, and your appearance throughout recruitment must match the captured photo.
The live photo capture tips for SSC cover lighting and camera placement in more detail, and they apply equally to the RRB portal.
SC/ST certificate for the free travel pass
SC and ST candidates who want the free railway travel pass for the exam upload their caste certificate as a PDF under 400KB. It must be legible and valid as on the closing date of the application. If your scan is larger, compress the PDF before you upload; 200KB leaves you a comfortable margin under the limit.
Checklist before you press submit
- Signature file is JPG or JPEG and reads between 30KB and 49KB.
- Signature is in black ink, running handwriting, with no grey or coloured background.
- The preview shows the whole signature centred in its box, with nothing cut off.
- For the live photo: dark clothes, no glasses or mask, even light on your face.
- SC/ST certificate, if needed, is a PDF under 400KB.
- You have read the CEN for your own post group (06/2025 or 07/2025) or the newer notice if one is out.
Applying for Railway Level 1 posts too? The RRB Group D upload guide covers CEN 09/2025, which uses the same signature rule.
Tools for this
Frequently asked questions
Do I need to upload a photo for RRB NTPC?
No. Under CEN 06/2025 and CEN 07/2025, the photograph is captured live through your webcam or phone front camera while you fill the form. You are told not to upload or photograph a pre-existing picture. Only the signature is uploaded as a file.
What is the RRB NTPC signature size in KB?
The signature must be a JPG or JPEG between 30KB and 49KB. The image must be at least 140 pixels wide and 60 pixels tall, scanned at 100 DPI or more, and it should sit centred in a 35mm by 20mm box on the form.
My signature file is only 15KB. Why is RRB rejecting it?
RRB sets a minimum of 30KB, which is higher than most exam forms. A small, clean file fails the lower limit. Rescan at a higher resolution or use a resizer that sets a KB range, and check that the final file reads between 30KB and 49KB.
Can I sign in blue ink or in capital letters?
No. Both NTPC notices require a black ink pen on white paper, in running handwriting. Non-black ink and block or capital letters are listed as grounds for rejecting the application, even at a later stage.
Are the RRB NTPC Graduate and Undergraduate upload rules different?
No. CEN 06/2025 (Graduate) and CEN 07/2025 (Undergraduate) use the same live photo rules, the same 30KB to 49KB signature rule and the same under 400KB limit for the SC/ST certificate PDF. Only the posts, vacancies and dates differ.
What size should the SC/ST certificate be?
It must be a PDF under 400KB, and only candidates asking for the free railway travel pass need to upload it. The certificate must be the latest valid one as on the closing date of the application.
Sources
- RRB CEN 06/2025 (NTPC Graduate), detailed notice, paras 14.4-14.5 (RRB notice board: CEN 06/2025 > Notification) (checked 2026-09)
- RRB CEN 07/2025 (NTPC Undergraduate), detailed notice, paras 14.4-14.5, and Corrigendum 1 (27.11.2025) (checked 2026-09)
- RRB CEN 06/2025 FAQs (signature and certificate sizes) and Corrigendum 1 (19.11.2025) (checked 2026-09)
- Railway Recruitment Boards application portal (checked 2026-09)
Rules and limits change. Always check the latest official notification or portal before you submit a form.