Signature Resizer
Trim the empty paper around a scanned or photographed signature, resize it to the dimensions a form asks for, and cap the file size — all in your browser.
Check your form for the exact size. Signature requirements differ by application and change over time. Take the exact dimensions and file size from the form you are filling in. The sizes below are common starting points, not official requirements, and CurePDF does not verify them against any authority.
Choose an image
or drag and drop it here
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Getting a good result
Sign on plain white paper
Trimming looks for the edge of the dark content. A plain, evenly lit background makes that boundary obvious; lined or patterned paper does not.
Let trimming do the cropping
Automatic trim removes the blank margin so the signature fills its box. If it finds nothing to remove, it leaves the image untouched and says so rather than cropping at random.
Check the result at full size
A signature reduced to 140 px wide is small. Look at the preview before downloading — if strokes have disappeared, start from a higher-resolution scan rather than compressing further.
What the presets actually produce
Measured on a 1600 × 900 scan saved as a 51 KB PNG, with the ink in the middle third and blank paper around it. Your own file sizes will differ — how many kilobytes an image needs depends on what is in it — but the output dimensions are exact, and the pattern is what matters.
| Preset | Without trimming | With trimming |
|---|---|---|
| 140 × 60 px | 1.4 KB | 2.7 KB |
| 300 × 80 px | 1.9 KB | 4.8 KB |
| 200 × 100 px | 1.8 KB | 4.1 KB |
| 350 × 100 px | 2.2 KB | 5.8 KB |
Trimming makes the file bigger, which surprises people. It is the right result: once the blank paper is removed the signature fills the frame, so every pixel carries ink instead of cheap flat white. You are getting a larger, more legible signature for those extra kilobytes, not waste. Note also how small all of these are — well under even a 10 KB limit — so for signatures the size cap rarely has anything to do.
Where the processing happens
Everything on this page runs in your browser. Your image is read from disk, resized, and offered back for download — in the normal case it never reaches us at all, which matters more than usual here, since an identity photo or a signature is exactly the kind of file you would rather not upload.
If your browser cannot handle a particularly large image, CurePDF will say so and offer to process it on our servers instead — but only after you explicitly agree, and nothing is sent before you do.