Open signed documents online

Choose your .xades, .asice, .p7s or .p7m file to see the document and signer information.

or drop it here

Usually in Downloads or Files.

Your file isn't uploaded.

File
Integrity
Certificate
DSS (EU)

.xades
.asice
.p7s
.p7m

1Choose a file
2See the signature and PDF page 1 free

What you might see

decyzja.pdf.xadesSample

Contents match the signature

No changes were found in the content we could check.

What the signature records

Signer: Jan Testowy
Date and time: 10/12/2026, 09:41 AM UTCstated by the signer

Shown as recorded. This tool does not check these details or the certificate issuer.

FileOpenedThe file was read and opened.
IntegrityConsistentWhether the content mathematically matches the signature or timestamp.
CertificateNot checkedThis tool shows the certificate details as written and does not check them.
Also checkin DSS (EU)Opens a free tool in a new tab.

Example office

Decision no. 1/2026

This letter is invented. The document from your own file appears in this spot.

Jan Testowy

Updated: October 2026

Privacy

File: never uploaded
Account: not needed
Analytics: none

On a computer you can check this yourself: open the developer tools (F12, on a Mac Cmd+Option+I; in Safari first turn them on in its advanced settings), go to the Network tab and choose a file. No request carries your file.

Open a signed file in your browser

Choose the file at the top of this page, or drop it.
Read the document, the signer information and, where available, the integrity check.
If the PDF came separately, choose “Add the signed document”.

Files you can open

.xades: XAdES signature, with the document or separately
.xml: document and signature in one file
.sig: signature file, often sent with a PDF
.p7s .p7m: CAdES signature
.asice .asics: container with documents and a signature
.pdf: PDF with the signature inside
.tsr .tsd .m7m: timestamp

For free, you can see the first page of a PDF, plus XML files, text files, and JPEG and PNG images.

Other files, such as DOCX, TIFF or ZIP, appear in a list with their name and type, without a preview.

Frequently asked questions

How can I check that my file is not uploaded?

Open your browser's developer tools, switch to the Network tab and then choose a file on this page. No request carrying your file appears in the list. The file is read by code running in your own browser, so there is nothing to upload and nothing stored on a server.

Is this an official or legal validation of the signature?

No, the result is informational. The page opens the file, shows the signer information stored in it and, where available, runs an integrity check on the content. It does not check whether the certificate issuer is trusted or whether the certificate was revoked. Qualified validation under eIDAS is a service of qualified trust service providers.

I received two files, a PDF and a .xades or .p7s. What should I do?

Often the signature sits in the second file and refers to the PDF, so keep both files together. Open the signature file here first to see the signer information. Then choose “Add the signed document”, or drop the PDF on that panel, to see whether it matches the signature, a different file was chosen, or this could not be checked. Do not edit or re-save the PDF, because the signature refers to its exact content.

The page says “Integrity not checked”. What does that mean?

The page opened the file but could not run the check, for example because the signature uses an algorithm this tool does not support, or the file does not include the signer's certificate. This does not mean the file is fake. You can still read the document, and you can check the file with the free tool linked on this page.

The signing certificate has expired. Is the document worthless?

Not automatically. A certificate matters above all at the moment of signing, and a timestamp in the file can show when that was. This page shows what the file declares about the certificate and any timestamp it contains, without judging them. Whether that is enough for your purpose is a question for a qualified trust service provider.

Can I open the file on my phone?

Yes. The page works in a mobile browser, so you have nothing to install. Save the attachment from your mail to the phone first, then choose it on this page; it is usually in your Downloads folder. The file stays on the phone, just as it stays on a computer.

What is free and what is paid?

Opening the file and viewing it are free, with no account. You see the signer information and the first page of a PDF, as well as XML, text files, and JPEG and PNG images. Every page of a longer PDF, saving and printing are the paid part.

Why a signed file does not open with a double click

Your computer picks a program by the file’s extension, and for .xades, .sig or .p7s it usually has none assigned.

So it asks what to open the file with. A text editor will then show rows of tags or unreadable characters instead of the letter you expected.

The cause is how the file is built. It is mainly a signature with certificate details, and the document is either encoded inside it or sits next to it in a separate file. A PDF reader cannot pull those apart.

A signed .xml does open straight away, but you see the document and the signature mixed together in one stream of tags. Renaming the file to .pdf does not help either, because its content stays the same.

Where these files come from

A signed file reaches you when someone signs a document electronically instead of on paper: often a public office, a bidder in a tender or the other side of a contract.

Signing software saves the result in one of a few formats. Which one you get depends mostly on the country and the tool that signed it.

Poland: a tax decision can arrive as a PDF with a separate .xades, and an attachment from e-Doręczenia can be a signed .xml, often named -sig.xml.
Slovakia: a document from a slovensko.sk mailbox usually arrives as an .asice container, a ZIP with the documents and signatures inside.
Brazil and Romania: signed files often end in .p7s, with the document inside or next to it.
Italy: signed files often end in .p7m.

When the name misleads

This page recognises the format from the file’s content, not from its extension. A file ending in .xml can be a signed document, and a .p7s can have the document inside it.

So if the name looks wrong, try the file anyway before you ask for a new copy.

Encrypted files and files that need a password are the exception: they do not open here. Ask the sender for a copy without encryption.

When you need a result with legal weight

Qualified validation is done by a qualified trust service provider. Free tools give you more information, but their result is not a qualified validation.

For your own information, you can check the signature in the European Commission's free demo tool: DSS demo validation service

You can also use a signature provider's software.