Is this PDF signed looks for a signature byte range, counts file endings, and compares creator and producer strings. A range that does not cover the file is described as changed after signing. No range is described as no signature. Certificate chain status is not judged, because no trust list is bundled, and revocation is described as not checked offline. A Content Credentials marker is reported when the bytes contain one, without verifying the manifest. The page never says fake or authentic. No signs of editing found is paired with a reminder that this does not prove the document is genuine. An earlier revision is not reconstructed. Compare needs the earlier file from you.

Is this PDF signed stays on this device. The download is the copy you keep, and Weesize does not store a second one. Close the tab when you are finished and the bytes are gone.

• No upload: byte ranges and info strings are read locally, with no call to a trust service.
• Speed: the file does not travel to a server and back, so the wait is only the work itself.
• Quality: the original is kept when the new file would be worse or is not actually smaller.