⚡ 10-second version
The form wants your signature between 10 and 20 KB, at a specific pixel size, on a white background. Your photo of it is 3 MB, grey, and mostly desk. tooladda.online/signature-resizer.html crops it, cleans it, and lands it inside the range on the first try.
❗ Important
A clean image of your signature is a forgery-ready asset. It is processed entirely in your browser here — no upload, no storage, nothing sitting in a stranger's temp folder after your exam form is submitted.
🎯 Why your signature keeps failing the upload
Government and bank portals check three things at once, and most people only fix one:
| Check | Typical requirement | Why yours fails |
|---|---|---|
| 📏 Pixel dimensions | Often around 140 × 60 px (varies by portal) | A phone photo is 4000 × 3000 — off by a factor of thirty |
| ⚖️ File size in KB | Commonly a band like 10–20 KB — a minimum too | Under-compress and it's too big; over-compress and it's below the minimum and still rejected |
| 🎨 Background | Plain white | Photographed paper is grey/beige with a shadow, and looks nothing like white to a validator |
That minimum size is what catches people. A range of "10 KB to 20 KB" means a 4 KB file fails just as hard as a 200 KB one. Blindly maximising compression is not the answer — you need to land inside a window, which is exactly what the target mode here does.
The format trap
Save a tiny, mostly-white signature as PNG and it can easily come out larger than the limit, because PNG is lossless and won't discard anything. The same image as JPEG compresses trivially. If your portal accepts JPEG and you're stuck above the ceiling, that's usually the whole fix.
| Format | Behaviour on a signature | Verdict |
|---|---|---|
| JPEG | Compresses hard; easy to tune into a KB window | ✅ Usually the right choice |
| PNG | Lossless, often stubbornly above small limits | ⚠️ Only if the portal demands it |
| Scanned at 600 DPI | Enormous before you start | ❌ 150–200 DPI is plenty |
🧭 How it works
✨ What's inside
| ### ⚖️ KB **range** targeting Not just "make it smaller" — land between a minimum and a maximum, which is what the forms actually specify and what trips everyone up. | ### ✂️ Automatic crop Finds the ink and trims the paper, desk and shadow around it. Cropping tight is also what makes the pixel resize look right. |
| ### 🧼 Background cleanup Turns photographed grey paper into plain white while keeping stroke edges intact, so it reads as a scan rather than a snapshot. | ### 👀 Before/after check Verify the signature is still legible at the final size. A signature compressed into a smudge fails human verification even when it passes the validator. |
🛠️ Where it's needed
| Form | What's checked |
|---|---|
| 🎓 SSC CGL / CHSL | Photo and signature each with their own pixel + KB spec |
| 🏛️ UPSC | Strict dimensions; some notifications also want a date |
| 🏦 IBPS / bank exams | Signature, photo, thumb impression, handwritten declaration — four separate specs |
| 🪪 PAN / KYC | Signature in a defined box and file size |
| 🎫 Visa portals | Sometimes a signature alongside the photo |
| 🎓 University admissions | Portal-specific limits, usually undocumented until it rejects you |
📖 Five steps
1. Capture → sign on plain white paper with a dark pen, photograph in daylight
2. Open → tooladda.online/signature-resizer.html
3. Crop → auto-crop, adjust if needed
4. Set → required pixels + the KB range (min AND max)
5. Check → still legible? → download
▶ Resize now — tooladda.online/signature-resizer.html
💡 Tip
Sign with a black or dark blue gel pen on plain white paper, and photograph it in daylight with no shadow across the page. A clean input makes the auto-crop and background cleanup nearly perfect; a pencil signature on ruled paper will fight you at every step.
⚠️ Warning
Read the actual notification for your exam or portal. The 140×60 px and 10–20 KB figures above are common, not universal, and they change between years and between the photo and signature fields on the same form.
❓ FAQ
Is it free?
Free, no watermark, no signup, unlimited use.
Is my signature uploaded anywhere?
No — processed entirely in your browser. Given what a signature image can be used for, that's the most important feature here.
My file is below the minimum size and still rejected. Why?
Because the spec is a range. Anything under the minimum fails too. Use the range mode so the output lands inside the window instead of as small as possible.
JPEG or PNG?
JPEG unless the portal insists on PNG. PNG is lossless and frequently can't get under small KB ceilings for this kind of image.
Can I use a photo instead of a scan?
Yes. Plain white paper, dark pen, daylight, no shadow — the background cleanup handles the rest.
What about the photo requirement on the same form?
Use the Passport Photo Maker for geometry and Compress Image to KB for its size limit — they're always specified separately.
🔬 Under the hood
- Canvas processing in vanilla JavaScript, no server round-trip.
- Auto-crop detects ink bounds; background normalisation preserves stroke antialiasing.
- KB targeting is an iterative search bounded by both the minimum and maximum.
- Offline-capable once loaded.
Originally published on ToolAdda, where Signature Resizer runs free in your browser — nothing is uploaded, nothing leaves your device.
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