Check the file before the upload.
Catch an unsupported format or a renamed file before adding it to your workspace.
File contents stay in this browser. Nothing is uploaded by this checker.
What this check does—and does not establish
This tool checks the beginning of the file for a supported format signature and checks its size. It does not scan for malware, read every page, unlock encrypted PDFs, verify signatures or confirm insurance coverage. A matching header alone does not prove a file is safe or readable.
A workspace upload stores the source privately and may send it to an AI provider for extraction. That is a separate action from this local check. See our Privacy Policy and security overview.