Free tool

Check an electronic signature

Upload a signed file and you will see whether the signature is valid, whether the document was changed after signing, and whether the signature is qualified. The check runs on the same validator Tvarka uses for its own documents. The file is never stored – it is checked and immediately deleted.

Signed file

Accepted: .pdf, .adoc, .asice, .sce, .bdoc, .asics, .ddoc. Size limit – 10 MB.

Check the signature

Which formats we check

We check signed PDFs (PAdES), ASiC-E containers (.asice, .sce, .bdoc) and ASiC-S (.asics) with XAdES or CAdES signatures, as well as Lithuanian ADOC and DDOC documents.

Two formats are not checked here. A detached CAdES signature file (.p7s) does not contain the document itself, so the signature can only be verified together with the signed file – you need both. JAdES is a format for system interfaces, exchanged between programs rather than people; it is issued and verified by the Tvarka API.

What the answer means

• The qualified signature is valid – the signature is valid and is equivalent to a handwritten one under Article 25 of eIDAS.
• The signature is valid but not qualified – the document is unchanged, but the signature does not meet the requirements for a qualified signature.
• The document was changed after signing – the file content no longer matches what was signed.
• The signature is invalid – the signature itself fails the check, for example the certificate was revoked or was not valid at the time of signing.
• No electronic signatures found in the file – the file is not signed, or the signature is not stored inside it.
• Could not be confirmed – a signature is present, but its validity could not be determined, most often due to missing certificate data.