Resize a Signature Image for Documents
Official forms and e-signature fields often specify an exact signature size in pixels, and a signature that arrives too large or too small looks wrong on the page even when the form accepts it. Enter a width, a height, or both, and this returns the resized image. One behaviour worth knowing up front: leave one field blank and the signature scales proportionally, which is what you usually want. Fill in both and the image is fitted inside those exact dimensions with white padding added around it — correct when a form demands a precise box, but it will place your signature on a white rectangle rather than a transparent one.
Target Dimensions (pixels)
Leave one blank to scale proportionally. Common: 200×50 px (email footer), 300×100 px (form field).
Drag & drop your file here
or click to browse
JPEG, PNG, WEBP · Max 10MB
How it works
Upload your signature image.
Enter the target width and height in pixels.
Download the resized signature — aspect ratio is preserved if only one dimension is entered.
Why use this tool
Many official forms specify an exact signature area size.
Prevents the signature from appearing too large or too small in a document.
If the result is not what you expected
My transparent signature came back with a white background
Entering both width and height pads the image to those exact dimensions, and that padding is white. If you need transparency preserved, enter only one dimension and let the other scale automatically. If the background was already lost, re-run the original through Signature to Transparent PNG and resize with a single dimension afterwards.
I do not know what pixel size the form wants
Common conventions: around 200 × 50 px for an email footer, 300 × 100 px for a typical form field, and 150-300 px wide for a signature inside a Word or PDF document. If the form states a size in millimetres or inches, multiply inches by 300 to get pixels at print resolution.
The signature looks jagged or fuzzy after resizing
Almost always the result of enlarging a small original. Scan or photograph the signature as large as you reasonably can, then size down — reducing keeps the strokes clean, enlarging never does.
The signature is too heavy or too faint on the document
That is a contrast issue rather than a size one. Run the scan through Signature to Transparent PNG first — removing the paper background usually makes the ink read correctly against the document, without needing to change the size at all.
Frequently asked questions
- Leave one dimension blank and the tool will scale proportionally. Entering both width and height will fit the image within those bounds with white padding.
- Check the document requirements. Common sizes are 200×50 px for email footers, 300×100 px for form fields, or exact sizes specified by the official form.