Validate signature
Free, no sign-up. o arquivo fica no seu aparelho — só o selo embutido é conferido
How to use
Frequently asked questions
Only that the seal recorded in the file (hash, timestamp and code) was really issued by the Sign PDF tool. It does not analyze the document content, does not confirm the signer's identity and does not attest legal validity — it is a technical origin check, not a legal opinion.
Because the PDF does not carry this tool's seal: it may have been signed with another service, the record may have been removed or edited, or it simply is not a PDF signed here. That does not mean the document is fake — only that its origin cannot be confirmed through this specific seal.
Yes, but it never leaves your device: reading the seal happens in the browser, and only the three values recorded in it (hash, timestamp and code) are sent to the server for the check.
That is not what it checks — it validates the authenticity of the seal (whether it truly came from AjustaJá), not whether every page of the content remains identical to when it was signed. For important decisions, pair this check with common sense: confirm the document content directly with whoever signed it.