Transparent PNG: best
No processing is needed and the edges are exactly as you saved them. Use the signature maker once to create one.
Sign a PDF With a Signature Image
If you already have your signature saved as a file, upload it and PureSign puts it on your PDF. A transparent PNG is used as it is, and a photo is cleaned up first.
Drop your PDF here
or click to browse
PDF up to 10 MB
Private by design. Your PDF is processed on your device and never uploaded.
How to sign a PDF with a signature image
- 01
Open the PDF
Drop it into the tool above.
- 02
Upload your signature image
Choose Upload signature image and pick the file. PNG, JPG, and WEBP up to 10 MB work, and the signer also reads HEIC photos.
- 03
Let it prepare the image
A PNG that is already transparent is used as it is. A JPG, or a PNG with a white background, goes through background removal first.
- 04
Place it and download
Drag it onto the signature line, resize it, and download the signed PDF.
Which image file works best
JPG or WEBP on white paper
Fine. The background is removed for you. Make sure the signature fills most of the image and the paper is evenly lit.
A photo from your phone
Works, including HEIC from iPhone. A close, well-lit, straight-on photo gives a cleaner result than a wide shot of a desk.
A scanned page with other writing
Crop to the signature first. If printed text or ruled lines are in the picture, the ink detector may treat them as part of the signature.
Common questions about the image itself
Will it keep its size?
You resize it on the page. Larger source images give sharper results when scaled up.
Can I reuse the same image?
Yes. Upload it again for the next document, or save it to your vault when signed in so it is one tap away.
Frequently asked questions
Can I sign a PDF with a PNG of my signature?
Yes. Open the PDF, choose Upload signature image, and pick your PNG. A transparent PNG is placed as it is.
What if my signature image has a white background?
The signer removes the background automatically for JPGs and for PNGs without transparency, so the white box does not appear on the PDF.
Which image formats are accepted?
PNG, JPG, WEBP, and HEIC. Files can be up to 10 MB.
Does the signature image get uploaded?
No. It is read and processed in your browser. It is only stored if you choose to save it to your vault after signing in.
I do not have a signature image yet. What now?
Make one with the signature maker by photographing your signature, drawing it, or typing it. Then come back and use it.
Related
Add signature to PDF
Place a signature, initials, a date, or a check mark exactly where a PDF needs one.
Remove background from signature
Already have a photo or scan? Strip the paper and shadows to a transparent PNG.
Digital signature PNG
A transparent PNG of your signature, and how it differs from a certificate-based digital signature.
Why can't I sign this PDF?
The exact messages PureSign shows when a PDF will not open, and how to fix each.