Resize a Signature Online
Set your signature to the exact pixel size a form needs — by width, or fitted inside a box — while keeping it crisp. Free and in your browser.
Drop a signature to clean
Drag & drop, paste, or pick a photo or scan
PNG · JPG · WebP — cleaned on your device
Sizing a signature correctly
Forms and documents often specify a signature size in pixels — say 300×80 — or a box it must fit inside. Upload one that's too big and it's rejected; too small and it looks pixelated. Getting the dimensions right is the difference between an accepted form and a frustrating re-upload.
This tool resizes by an exact width (the height follows automatically to keep the proportions) or fits the signature inside a maximum width and height. Because it works from the full-resolution original and trims to just the ink first, the resized signature stays as sharp as possible.
How to resize a signature
- Open your signature. Drag a photo or scan onto the tool, choose a file, or paste it.
- Trim to the ink. Keep auto-trim on so the size is measured from the signature itself, not the paper around it.
- Pick a size. Choose 'Width' for an exact width, or 'Fit box' to fit inside a max width and height.
- Download. Save at the exact size — as a transparent PNG or a JPG, as the form requires.
Resize down, not up
Shrinking a signature keeps it sharp; enlarging a small one makes it blurry. Start from the largest, clearest photo or scan you have, then resize down to the target. If you also need a file-size limit, set a target KB at the same time.
Resize a signature: what this tool does
- What it does
- Sets your signature to an exact pixel width (height follows to keep the proportions) or fits it inside a maximum width and height, while keeping the ink as sharp as the source allows.
- How it works
- Because the tool first trims to just the inked pixels, the size is measured from the signature itself rather than the empty paper around it, and the resize is computed from the full-resolution original so detail isn't thrown away before scaling.
- Best export
- A transparent PNG at the exact dimensions by default, or a JPG with a white background when a document or form requires JPG.
Practical tips
- Always resize down, not up: shrinking a large, clear capture stays crisp, while enlarging a small one makes the strokes blurry — start from the biggest, sharpest photo or scan you have.
- Common signature boxes on forms are small and wide (for example around 300 × 80 px), so trimming to the ink first makes the proportions predictable and avoids a tiny signature lost in a large frame.
- If you also have a file-size cap, set the pixel size and the target KB together — a smaller pixel size is often what finally brings the file under a very low limit.
More signature tools
Frequently asked questions
How do I set an exact pixel size?
Choose 'Width' and type the pixel width; the height is set automatically to keep the aspect ratio. Use 'Fit box' to cap both width and height.
Will resizing blur my signature?
Resizing down stays sharp. The tool works from the full-resolution image and trims to the ink first, so detail is preserved.
Can I resize and hit a file-size limit together?
Yes. Set the pixel size and a target file size (KB) at the same time and the tool does both.
Where is my image processed?
The cleanup happens in your browser, so the new file is created on your own device. How any data associated with the tool is handled is described in our privacy policy.
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