Tool category
Signature Tools
Signature uploads can fail for different reasons: the canvas dimensions are wrong, the file is too large, or heavy cleanup removes part of the handwriting. Start from a clear original, change only the setting named by the form, and inspect the downloaded image at full size before submission.
Diagnose the signature problem before changing the image
| What you see | Likely issue | Useful next action |
|---|---|---|
| Too much blank space around handwriting | Canvas framing | Try conservative trimming with the faint-stroke sample |
| Stretched or unusually tall handwriting | Aspect ratio changed | Use Contain and the required canvas dimensions |
| Faint ink disappears | Contrast or threshold is too strong | Return to the original; lower contrast or disable monochrome |
| White rectangle despite selecting PNG | The photographed paper is opaque | PNG preserves existing transparency; it does not erase the paper |
| Correct dimensions but rejected for size | The byte limit is separate | Use Maximum mode, then recheck thin strokes and pixels |
One controlled change at a time
Start with the synthetic stroke example. It has a pale line that makes destructive cleanup easy to spot. Compare a neutral resize with a trimmed version before trying stronger adjustments. For a real signature, preserve the original until the submission is accepted.
Image signature or digital signature?
A handwritten-signature image is a picture. A cryptographic digital signature is a document verification mechanism. These image tools resize pictures; they do not authenticate a person, grant authorization or create a cryptographic signature.
Available tools
Choose the correction the form requires
If the signature is cropped too tightly, begin again with the original and leave breathing room around faint strokes. If its pixels are wrong, resize while watching the preview. Use PNG or WebP when transparency is allowed; use JPG with a solid background only when the receiving form accepts it.
If the dimensions are right but the file is above a stated byte ceiling, use the compressor in Maximum mode after saving the resized signature. Reopen the final download to make sure thin lines remain visible.