How to sign a PNG online (free, no upload)

Sign a PNG in three steps

1. 1

   Open the PNG in the free signer

   Pick the file (up to 25 MB) or drag it in, screenshots included. It's converted locally into a one-page PDF matching the image dimensions.

2. 2

   Place your signature

   Draw with mouse, finger, or stylus; type your name in a handwriting style; or photograph your paper signature. Position and resize it on the page.

3. 3

   Download the signed PDF

   You get a flattened PDF saved to your device, the signature is part of the page, not a movable layer.

Screenshots as documents, a quick note

Signing a screenshot is fine when the counterparty just needs your acknowledgment on what was shown, a portal form, a displayed agreement. Keep in mind the screenshot's resolution is what ends up in the PDF: capture at full size rather than a thumbnail, and crop chrome (browser bars, taskbars) before signing so the signed document contains only the document.

PNG's lossless compression means text stays crisp through the wrap-into-PDF step, for text-heavy captures it produces a cleaner signed file than a re-compressed JPG.

Frequently asked questions

Is my PNG uploaded when I sign it?

No, the conversion to PDF and the signing both happen in your browser. You can watch the Network tab while doing it, or disconnect after loading the page; the flow completes either way, and the signed PDF saves locally.

Will the signed PDF keep the PNG's quality?

Yes. The image is embedded as-is into a page sized to its dimensions, no re-compression, no scaling. What you captured is what gets signed.

Can I get a PNG back instead of a PDF?

The signer outputs a flattened PDF, because that's the format recipients expect for signed documents and the one that keeps the signature non-editable. If you truly need an image, take a screenshot of the signed PDF page.