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RRB signature to 40 KB
The Railway boards want 30 to 49 KB. This lands inside it, not under it.
More free conversions, where you upload. The Fylane extension does the same work inside any upload form, on its own free share every day.Add to Chrome
How to convert RRB signature to 40 KB
- Sign in black ink on white paper and scan or photograph it.
- Crop away everything but the ink, then drop it here.
- Download the file and upload it to the RRB form.
What happens to your file
The Railway Recruitment Boards ask for a signature "between 30 KB and 49 KB" as JPG, at least 140 × 60 pixels, scanned at a minimum of 100 DPI. That is a window with a floor as well as a ceiling, which is why this page aims at 40 KB and stops there rather than shrinking as far as it can. A 12 KB file is not a safer 40 KB file; it is a rejected one.
The file never leaves your device. A JPG, PNG or WebP is decoded by the browser and a bounded search lowers the encoder quality until it fits, at most six probes. Ink on paper compresses easily, so the pixels usually survive untouched.
Two rules here that almost nothing else on the web mentions. The boards require running handwriting — joined-up — and list block or capital letters among their grounds for rejection. And they no longer take a photograph upload at all: the 2026 notices say the module captures one live through your camera, and that photographing an existing print will get the application summarily rejected. They even advise wearing dark, non-white clothing so you stand out from the background.
The notices disagree with themselves about the box you should sign inside. CEN 03/2026 gives 50 × 20 mm; CEN 01/2026, 02/2026, 09/2025 and 05/2025 all give 35 × 20 mm. Read the one for the exam you are applying to, and if in doubt sign in the larger box — the kilobyte and pixel rules are what the upload actually checks.
Questions
What is the RRB signature size?
Between 30 KB and 49 KB, JPG format, a minimum of 140 × 60 pixels, scanned at 100 DPI or better, in black ink on white paper. Those figures come from the 2026 CENs themselves, read on 18 September 2026. Pages quoting 3.5 × 1.5 cm or 10–40 KB for RRB are contradicted by the notices.
What size should my RRB photo be?
There is no photo upload any more. The 2026 notices state that candidates are not required to upload a pre-existing photograph, because the application captures one live through your webcam or phone camera. No pixel size, file size or format is published for it, and taking a picture of a printed photo is grounds for summary rejection.
Why was my signature rejected?
The boards publish nine reasons: a background that is not white, ink that is not black, writing in block or capital letters, poor resolution, a signature that is incomplete or only partly visible, a signature that is not yours, a blank image, a thumb impression used in place of a signature, and somebody else’s signature. None of those can be fixed by compressing — they are decided before you scan.
Does it have to be joined-up handwriting?
Yes. The notices call for running handwriting and reject block capitals or disjointed letters. Sign the way you would sign anything else.
What if I cannot use my thumb?
For candidates with a disability the boards accept a fingerprint in a set order — left thumb, then right thumb, then any finger of the hands, then any finger of the feet — and the same signature specification applies to the image.
Is it really not uploaded?
For JPG, PNG and WebP, correct — the page works with your network unplugged. The privacy sweep in our test suite asserts that no host is contacted. A signature is the one image on a form that can be misused, so this matters more here than usual.
Do it once, not on every form
A form that wants a square JPEG under 240 KB says so on the page. The Fylane extension reads that, fits your photo to it, and puts it in the field — without you working out what 240 KB looks like.
And it keeps the result. The next application that asks for a résumé, a cover letter and a photo fills all three from one tap, each one refitted to what that site accepts.
Your files stay in the browser, encrypted, on your machine. Nothing is uploaded to keep them and nothing is sent anywhere to fill a form.
Related tools
Do this in code
curl -X POST https://api.fylane.dev/v1/jobs \
-H "Authorization: Bearer $FYLANE_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"file_id": "<file id>",
"operation": "image.convert",
"options": {
"target_bytes": 40960
}
}'The same operation, image.convert — Re-encode to WebP, JPEG, PNG or AVIF at your quality. Upload first with the quickstart; every option is on the operations page. 500 free credits a month, then $5 per thousand.