If you’re filling out the India Post GDS application and your signature keeps getting rejected or the upload button won’t let you proceed, it’s almost always a size or ratio problem — not something wrong with your actual signature. The GDS portal wants your signature at exactly 320×160 pixels, in a 5:2 landscape aspect ratio (±10% tolerance), as a JPG file under 20KB. Miss any one of these and the system throws an error before you even get to submit.
This guide walks you through the exact specification, how to fix your signature file in under a minute using the tool above, and the mistakes that trip up most GDS applicants — including the “5:2 aspect ratio” error that a lot of people are searching for right now.
Why Your GDS Signature Keeps Getting Rejected
The India Post recruitment portal runs an automated check on every signature you upload. It’s not looking at how neat your handwriting is — it’s checking pixel dimensions, aspect ratio, file format, and file size. If any of these fall outside the accepted range, the form either blocks the upload or throws an “invalid image” / “5:2 aspect ratio” error. This happens to genuinely qualified applicants all the time, simply because their phone camera or scanner produced a signature image in the wrong shape.
India Post GDS Signature Size — Official Specification
- Pixel Dimensions: 320 width × 160 height
- Aspect Ratio: 5:2 landscape (±10% tolerance)
- Format: JPG / JPEG only
- File Size: Under 20KB
- Background: Plain white, no shadows or texture
- Ink Colour: Black or dark blue for clear contrast
Note: India Post occasionally updates these specifications with each recruitment cycle, so cross-check the dimensions mentioned in your specific year’s official notification before final submission.
What Our India Post GDS JPG Signature Resizer Online Does
Instead of you manually calculating pixels or fighting with Paint and Photoshop, the tool above takes care of every requirement in one go:
- Resizes your signature to exactly 320×160 pixels
- Locks the 5:2 aspect ratio so you never hit the ratio error again
- Compresses the file to under 20KB without making it blurry
- Cleans up the background to pure white
- Converts any image format to GDS-accepted JPG
- Works fully on mobile — no app download needed
Need your photo resized too? Use our GDS Photo Resizer alongside this tool to get both documents ready in one sitting.
How to Resize Your GDS Signature — Step by Step
1. Sign Clearly on Plain Paper
Use a plain white sheet with no ruled lines. Sign the way you normally sign — the same signature you use on your Aadhaar, bank documents, or SSC/board exam forms. GDS verification staff do compare this later, so don’t experiment with a “special” signature just for this form.
2. Take a Clear Photo or Scan
A smartphone photo in good daylight works fine — you don’t need a scanner. Keep the paper flat, avoid shadows falling across the signature, and make sure the ink is dark and readable in the photo before you move to the next step.
3. Upload to the Resizer
Click the button at the top of this page and upload the photo or scan of your signature.
4. Let It Auto-Fit to GDS Specs
The tool automatically crops and resizes to 320×160 pixels, corrects the aspect ratio to 5:2, and compresses the file to fit under 20KB — no manual settings needed on your end.
5. Download and Double-Check
Before uploading to the official GDS portal, open the downloaded file and check its properties — dimensions should read 320×160 and file size should be comfortably under 20KB.
Common GDS Signature Errors and How to Fix Them
| Error You’re Seeing | What’s Actually Wrong | Fix |
|---|---|---|
| “Image must have 5:2 aspect ratio” | Your image isn’t in landscape 5:2 shape | Use the resizer above — it auto-corrects the ratio |
| Upload fails silently | File is in PNG, PDF, or WEBP instead of JPG | Convert to JPG using the tool |
| “File too large” / stuck upload | File size is above 20KB | Run it through the compressor |
| Signature looks faded after upload | Ink was too light in the original photo | Retake photo with better lighting/contrast |
| Signature looks blurry | Started from a low-resolution image | Use a sharper original photo before resizing |
| Grey or shadowed background | Uneven lighting during photo/scan | Use the background-correction step in the tool |
Should You Draw It Digitally or Scan a Handwritten One?
- Scanned/photographed signature: Sign on paper first, then photograph or scan it. This is what most applicants use, and it matches your usual signature style.
- Digital signature (mouse/touchpad): Drawn directly on a device. Convenient if you don’t have paper handy, but often looks less natural — use this only if you’re confident it still resembles your real signature.
- What we’d recommend: Stick with your normal handwritten signature, photographed clearly. It’s what verification staff expect to see.
Quick Tips Before You Submit
- Sign 2-3 times on paper and pick the clearest one
- Use the same signature style you’ll use throughout your GDS career — it’s part of your permanent record
- Keep a copy of both the original and resized signature on your phone or drive
- Rename the file to something simple, like signature.jpg, before uploading
- Check the current year’s official GDS notification PDF for any spec changes before final submission
Final Checklist Before You Upload
- ✓ Dimensions: 320×160 pixels
- ✓ Aspect Ratio: 5:2 landscape
- ✓ File size: Under 20KB
- ✓ Format: JPG/JPEG
- ✓ Background: Pure white, no shadows
- ✓ Signature clearly visible with good contrast
- ✓ File name kept simple (e.g. signature.jpg)
Important: The signature you upload should match the one you’ll be using on official Department of Posts documents going forward — don’t treat this as a one-off formality.
Conclusion
Getting your signature to fit India Post’s 320×160, 5:2, under-20KB requirement isn’t complicated once you know the exact numbers — most rejections happen simply because applicants don’t know what shape and size the portal actually expects. Run your signature through the resizer above, double-check it against the checklist, and you’re done in a couple of minutes with one less thing to worry about in your GDS application.
Frequently Asked Questions
The signature must be 320×160 pixels in a 5:2 landscape aspect ratio, saved as a JPG under 20KB, on a plain white background.
This appears when your uploaded image isn’t in landscape 5:2 proportions. Using a resizer that automatically corrects the ratio to 320×160 pixels fixes this instantly.
Yes, but a photographed or scanned handwritten signature is generally recommended since it matches your usual signature on other official documents.
Use an online GDS signature resizer that compresses the image while keeping it sharp, rather than manually saving at low quality which can make it blurry.
No, the signature and photo are separate uploads with different specifications. Your signature should instead match the one you use on your other official identity documents.