Signature Resizer
Enter the exact width, height, and maximum file size a form requires, and LimiFile resizes your image to fit, compresses it under the limit, and checks each condition against the JPG it actually produced before you download it.
Enter the exact width, height, and maximum file size your form requires, and LimiFile checks each condition against the file it produces before you download it.
Your images are processed on this device and are never sent to a server.
This browser doesn't support the features needed for Signature Resizer.
What this tool does
- Accepts JPEG and PNG, and always outputs JPG (JPEG), since that's what most upload forms require.
- Resizes to the exact pixel width and height you enter — either keeping proportions and padding with white, or stretching to fill the size exactly.
- Searches JPEG quality (not dimensions, once set) to fit your file size limit, and shows the closest result it could reach if the limit can't be met.
- Verifies width, height, file size, and format independently against what the converted file actually measures, and shows a pass/fail result for each — it doesn't assume success.
- Fills any transparent areas from a source PNG with white before converting, since JPG has no transparency.
How to use it
- Select a JPEG or PNG image (a signature, photo, or scan).
- Enter the width, height, and maximum file size your form specifies.
- Choose whether to keep proportions (padded with white) or stretch to the exact size.
- Convert, check the pass/fail result for each condition, and download the JPG.
Important limitations
- Only JPEG and PNG are accepted as input; WebP, HEIC, and AVIF are not supported on this page.
- Cropping isn't available yet — "Keep proportions" pads with white instead of cropping to fill the exact size; a crop mode is planned for a future update.
- Animated PNG (APNG) is not supported.
- LimiFile verifies pixel dimensions, file size, and output format only. It cannot verify a form's other requirements — such as what the signature or photo shows, background color, or margins — so always compare the result against your form's full instructions before submitting.
- JPEG quality search has a floor; if a very small file size can't be reached at any quality LimiFile currently uses, the closest result is offered instead of a false success.
- This tool cannot guarantee any submission will be accepted — it only checks the width, height, file size, and format you told it to check.
Privacy
Resizing and conversion both happen in your browser. Your images are never uploaded to a server.
Frequently asked questions
What exact width, height, and file size should I enter?
Check the form or website you're submitting to — these requirements vary by organization and aren't standardized, so LimiFile doesn't guess them for you. Enter whatever width, height, and maximum file size that form specifies.
What's the difference between "Keep proportions" and "Stretch to exact size"?
"Keep proportions" fits your whole image inside the target size without distorting it, padding any leftover space with white. "Stretch to exact size" fills the target size exactly, which can distort the image if its proportions don't match.
What happens if my file can't fit under the size limit?
LimiFile shows which condition wasn't met and offers the closest result it could produce, at the lowest JPEG quality it currently uses — it won't claim the size limit was met when it wasn't. Try a larger size limit or smaller dimensions if the result isn't usable.
Does this guarantee my submission will be accepted?
No. LimiFile checks the pixel dimensions, file size, and format you asked it to check — nothing more. It can't verify content-specific requirements like what the photo or signature shows, background color, or margins, so review your form's full instructions before submitting.
Can I crop my image before resizing?
Not yet. "Keep proportions" avoids distortion by padding instead of cropping. A crop mode is planned for a future update.
What happens to transparency in a PNG?
The output is always JPG, which has no transparency, so any transparent areas in a source PNG are filled with white before conversion.