Open TSR files in your browser
The answer a time stamping authority gives, proof that a file existed at a moment. Drop it with its file to see when, by whom, and whether they match. Nothing leaves your device.
Or drop it anywhere on this page
What you'll see
Your signed file opens as who signed it and when, each check listed, then the file inside.
- Who signed • Checked against the roots Filepeek carries
- When • Its timestamp and the authority behind it
- The file inside opens in its own viewer
- Every check listed • Nothing asked of a CA
About TSR
RFC 3161, published in 2001, sets out how a time stamping authority signs a file's hash with the time it saw it. Its answer is saved as a .tsr, and the token inside it, the part that counts, as a .tst. Signing apps keep them beside signed files, as contract.pdf.p7m.tsr.
A timestamp holds no part of the file, only its hash, the time, a serial number and the authority's signature, made with a certificate that in Europe is often on a trusted list.
Drop the timestamp with the file it stamps, and Filepeek finds that file by its name or its hash, checks that they match, and checks the authority's certificate and its chain against the roots it carries.
Timestamp response
.tsr • .tst
Format
- MIME type
- application/timestamp-reply
- Made by
- The IETF
- Released
- 2001
Inside the file
- Holds
- A hash, a time and a signature
- Proves
- The file existed by then
- Standard
- RFC 3161
- Kept
- Beside the file it stamps
Opens in every browser
Browsers download TSR and TST files. Filepeek checks one against the file it stamps in Chrome, Edge, Firefox and Safari.
- YouChromeOpens through Filepeek
- YouEdgeOpens through Filepeek
- YouFirefoxOpens through Filepeek
- YouSafariOpens through Filepeek
Questions
How do I check a timestamp?
Drop the .tsr or .tst together with the file it stamps. Filepeek says when it was stamped, by whom, and whether the file matches its hash.
What's the difference between TSR and TST?
A TSR is the authority's whole answer, with its status. A TST is only the token inside, the signed time and hash. Filepeek opens both.
Does a timestamp prove who made the file?
No. It proves the file existed at that moment and hasn't changed since. A signature, like a P7M's, says who signed it.
Is my file uploaded?
No. The file opens inside your browser and never leaves your device.