Upload Signature & Crop
Auto-trim blank space around an uploaded signature.
Upload and Crop Signature Online
Upload Signature & Crop helps you prepare clean, legible digital signature images for online application portals, PDF signing workflows, and official forms—entirely inside your browser.
Supported formats: PNG · JPG · WebP · Processing: 100% browser-local HTML5 Canvas & Blob APIs
How to use Upload Signature & Crop
- Upload your signature image (JPG, PNG, or WebP).
- Adjust the Trim margin (px) and Background tolerance sliders to remove surrounding paper and blank whitespace.
- Verify the live preview and output dimensions, then click Process and Download.
Practical use cases
- Preparing 10 KB–20 KB signature images at 140 × 60 px or 3.5 × 1.5 cm for competitive exam and banking forms.
- Removing gray paper backgrounds from mobile photos of handwritten ink signatures.
- Creating transparent PNG signatures for placing over letters, invoices, and certificates.
Common size & DPI reference specifications
| Preset / Format | Physical Size | Pixels at 300 DPI | Common Application |
|---|---|---|---|
| Standard Portal Signature | 3.5 × 1.5 cm | 413 × 177 px | Civil service, banking, and university exam portals (10–20 KB) |
| Compact Signature Box | 4.0 × 2.0 cm | 472 × 236 px | Application forms and digital document blocks (20–50 KB) |
| High-Resolution PNG Stamp | 6.0 × 2.5 cm | 709 × 295 px | Transparent PNG overlay for letters and invoices |
Common problems & solutions
Solution: Increase the Background tolerance slider slightly, and make sure the photo of your signature was taken under even light without dark phone shadows.
Solution: In Signature Size Reducer or Signature Resize, select JPG as the output format; transparent pixels are automatically flattened onto a crisp white background.
Are my images uploaded to AJN Buzz?
No for this tool. Processing runs in your browser and no sign-in is required.
What is the best way to photograph a handwritten signature?
Sign with dark black or blue ink on unlined white paper, hold your phone parallel under bright daylight to avoid shadows, and let the tool trim and clean the background.
Are drawn or uploaded signatures stored anywhere?
No. Your signature is drawn and processed exclusively in your device’s browser memory and is cleared as soon as you close or reset the tab.
Overview · Upload Signature & Crop
Detect the visible signature area, add a small safe margin and crop away blank surrounding space.
Tool preview