How to make a clean signature file
- Sign with a dark pen on plain white paper and take a well-lit photo or scan.
- Enter the width and height the form asks for (300 × 100 px is a common size if none is given).
- Choose a white JPG or a transparent PNG, and optionally a maximum size in KB.
- Select Make signature file.
What the tool does
It finds the dark ink on the page, trims the empty paper around it, adds a small margin and fits the signature into your chosen dimensions without stretching it. The transparent option fades the paper to clear and keeps the ink, which is useful for placing a signature on a document. If you set a KB limit, JPG quality is reduced only as much as needed.
Privacy matters for signatures
A signature is sensitive. FileKivo processes it entirely in your browser; the image is never uploaded or stored. Close the tab when you are done and the working copy is gone.
Important
Only use a signature image where the organisation allows one. Some forms require a handwritten or a specific digital signature process instead. For photos of other documents, see Compress an image or Images to PDF.
Questions
- Why is my signature not detected?
- The tool looks for dark ink. Use a darker pen, brighter light and plain white paper.
- What size should a signature be?
- Use the dimensions stated by the form. If none are given, 300 × 100 px is a sensible start.
- Is my signature uploaded?
- No. It is processed only in your browser.