Short answer
Common reasons a PDF cannot be opened and what to try next.
Step-by-step fix
- Check whether the page says local, cloud, AI, or API processing.
- Try the related tool or reduce the file size if the browser reports a memory limit.
- Download the finished file and open it in a trusted viewer before sharing.
Related tools
Contact support
For security issues, use the responsible disclosure contact on the security page. For product issues, include the tool name and error message, but do not send private file contents.