50x20 mm
Resize Signature Image to 50x20 mm
50 × 20 mm is 590 × 236 pixels at 300 DPI. Upload a photo of your signature and it is cropped to the 5:2 strip and saved as a JPEG between 30 and 49 KB. The file never leaves your browser.
- Runs in your browser
- Nothing uploaded
- No sign-up
- Free, no daily limits
- 1Add your file
- 2Choose settings
- 3Download
Last updated
Government recruitment notices across railway and technical boards frequently specify a signature fitting a 50×20 mm (5×2 cm) bounding box. This client-side tool scales and center-crops your signature image to that exact 2.5:1 proportion, which computes to 590×236 pixels at 300 DPI, and exports a compliant JPEG file. The image processes entirely inside your web browser, keeping your personal signature private.
The tool center-crops your image and executes a binary compression loop targeting a file size between 30 KB and 49 KB to comply with Railway Recruitment Board standards. If your exam notice asks for a 3:1 shape, use our 6 × 2 cm signature resizer, or configure custom pixel limits in our Signature Resizer, and verify your document parameters with our Document Checker.
How it works
1. Upload signature photo or scan
Click Upload Photo or drop your signature file into the upload zone. Modern browsers read JPG, PNG and WEBP scans directly. Convert iPhone HEIC files to JPG before uploading on Windows or Android.
2. Confirm preset parameters
Examine the preset specifications panel showing 590×236 Pixels, 50×20 mm in Millimeters, 300 DPI Resolution, and the 30 to 49 KB File Size target range.
3. Execute crop and quality compression
Click Resize Photo. The tool draws the signature onto an in-memory canvas, aligns the 2.5:1 ratio, and adjusts JPEG quality downward to meet the byte limit.
4. Review specifications and download JPEG
Review the result badge. Files landing between 30 KB and 49 KB show Ready to use. Output under 30 KB receives trailing zero-byte padding. Click Download to save your signature.
When you'd use it
Railway Recruitment Board (RRB CEN) applications
Formatting scanned signatures for RRB Non-Technical Popular Categories (NTPC) and technical recruitment drives specifying a 50×20 mm box.
State entrance and scholarship applications
Preparing a standardized 2.5:1 signature file for university admission portals and government financial aid forms.
Public sector enterprise registration
Calibrating handwritten signatures for technical trainee and apprentice openings across central public sector undertakings.
Personal digital signature archiving
Saving a cleanly cropped 2.5:1 signature on your device so you have a ready-made asset for future online application forms.
50 × 20 mm dimensions in pixels across different DPI settings
In physical measurements, 50 mm equals 1.9685 inches and 20 mm equals 0.7874 inches. Multiplying physical dimensions by Dots Per Inch (DPI) produces the required digital pixel canvas. At the standard 300 DPI print and scan density, this calculation yields 590.55 × 236.22 pixels, which rounds mathematically to 591 × 236 pixels. This tool configures a 590 × 236 pixel preset to match standard 2.5:1 scanning templates.
Recruitment boards often specify scanning resolutions between 100 DPI and 300 DPI. As shown in the table below, scanning at 200 DPI yields approximately 394 × 157 pixels. TryDocsy's 300 DPI output helps ink strokes remain sharp when downscaled by portal upload engines.
| Scanning Resolution | Width (50 mm) | Height (20 mm) | Aspect Ratio |
|---|---|---|---|
| 72 DPI | 142 px | 57 px | 2.5:1 |
| 96 DPI | 189 px | 76 px | 2.5:1 |
| 150 DPI | 295 px | 118 px | 2.5:1 |
| 200 DPI | 394 px | 157 px | 2.5:1 |
| 300 DPI (This Tool) | 591 px | 236 px | 2.5:1 |
| 600 DPI | 1181 px | 472 px | 2.5:1 |
Which examination boards specify a 50×20 mm signature box?
Railway Recruitment Board CEN recruitment notifications, including RRB NTPC and RRB Group D, specify that applicants must sign on unruled white paper within a box of 50 mm × 20 mm, with file size between 30 KB and 70 KB (narrowed to 30 to 49 KB in specialized categories). Notifications explicitly warn that signatures in capital, block, or disjointed letters will be rejected.
In contrast, the Staff Selection Commission describes signatures as approximately 6.0 × 2.0 cm (a 3:1 ratio); for SSC forms such as SSC CGL (10–20 KB), use our 6 × 2 cm signature resizer. For banking exams under IBPS PO that mandate 140 × 60 pixels (10–20 KB), use our Signature Resizer.
Understanding the 30 to 49 KB preset, padding, and file size status
TryDocsy's 50×20 mm preset sets a target window of 30 KB to 49 KB, aligned with Railway Recruitment Board rules where files below 30 KB or above 49 KB are discarded by automated server upload filters.
On the 590×236 canvas the tool steps JPEG quality down from 1.0 toward a 0.1 floor and keeps the clearest signature that weighs 49 KB or less. Signatures lighter than 30 KB are padded to exactly 30 KB with zero bytes after the end-of-image marker, which satisfies a 30 KB floor without touching the strokes.
A photographed signature full of paper grain can stay over 49 KB even at quality 0.1. Instead of saving an oversized JPEG, the page shows an error and no file. Crop right up to the strokes and photograph the page under flat, bright light to get it under the limit.
Center-cropping mechanics and paper shadow limitations
Because the tool performs a center crop, it cuts off anything outside this 2.5:1 rectangle. If your signature is long or placed high on the paper, the automated crop will slice off the top of tall letters or the end of your name. Sign in the center of the paper, leave generous white space around your signature, and crop your original photo neatly around the writing before uploading.
The canvas context fills with white (#ffffff) before drawing your image, which only affects transparent areas (such as in a transparent PNG). The tool does not bleach grey paper, clean up uneven phone shadows, or remove background wrinkles. Capture your signature on clean white paper under bright, uniform lighting without casting phone shadows over the page.
Check before you upload: before uploading your signature, verify that dimensions and byte weight pass validation in our Document Checker using the Railway Signature, 236x83, 10-30 KB or SSC/IBPS Signature, 140x60, 10-20 KB preset.
Frequently asked questions
What is 50x20 mm in pixels?
At 300 DPI print and scan resolution, 50 × 20 mm equals 591 × 236 pixels (our tool preset uses 590 × 236 px). At 200 DPI it is 394 × 157 pixels, and at 96 DPI it is 189 × 76 pixels.
Does RRB accept signatures written in capital letters?
No. Railway Recruitment Board notifications explicitly state that signatures written in block, capital, or disjointed letters will be rejected. You must provide a normal running cursive signature.
Why do railway portals enforce a 30 KB minimum file size?
Recruitment intake servers enforce a 30 KB minimum floor to prevent candidates from uploading blurry, over-compressed files that become unreadable when printed on admit cards. Our tool applies non-destructive byte padding to keep clean files above 30 KB.
Which pen ink should I use for a railway application signature?
Use a black ballpoint pen on clean, unruled white paper. Black ink provides the highest optical contrast against paper backgrounds when scanned and processed by automated document intake filters.
Why were the edges of my signature trimmed off?
The tool center-crops the input to maintain a 2.5:1 aspect ratio. If your signature is off-center or has wide loops, the outer strokes may be clipped. Crop your image manually with balanced margins before uploading.
Is my signature photo uploaded to an online server?
No. Cropping, canvas drawing and JPEG compression run inside your web browser, and the signature image stays on your device.