Put a picture onto the pages of a PDF - a logo, a scanned signature, a photograph or a seal. You choose where on the page it sits and how large it is, and whether it appears on one page or throughout the document. The image is drawn on top of the existing content rather than replacing it.
Common raster formats such as PNG and JPEG. Use PNG when the image needs a transparent background - a JPEG logo will bring a solid white box with it and cover whatever sits behind.
It works for pasting a scanned signature, but the Sign PDF tool is built for that and lets you draw or type the signature directly. For a signature that can be cryptographically verified, use Certificate Sign PDF instead.
A high resolution photograph can add several megabytes, since it is embedded in full. Run Compress PDF afterwards if the size matters, or scale the image down before adding it.
Files are uploaded over an encrypted connection and processed on CoonTool's own server, not in your browser. The working copy is deleted automatically once the job is done, and in any case within 24 hours. Nothing is stored permanently and no account is required.