# XSeal

> XSeal cryptographically seals any file with a timestamped SHA-256 hash and a signed certificate, so you can later prove a document is byte-for-byte unchanged, or was altered. It stores only the hash and metadata, never your file contents. Verification is free and open to anyone with the file and its Seal ID.

## Core actions
- [Seal a file](https://xseal.nl/): Compute a SHA-256 hash and a signed certificate for any file, with a UTC timestamp.
- [Bulk seal files](https://xseal.nl/bulk): Seal many files in one action and get a combined, signed manifest proving the whole batch is unchanged, plus a certificate for every file.
- [Verify a file](https://xseal.nl/verify): Check a file against its Seal ID to confirm it is authentic, or detect tampering.

## Product
- [Pricing](https://xseal.nl/pricing): Free verification; paid plans for higher seal volumes, retention and a sealing API.
- [Documentation](https://xseal.nl/docs): How sealing and verification work, getting started, and the API.
- [Blog](https://xseal.nl/blog): Articles on document integrity, tamper-evidence, and EU eIDAS compliance.
- [Create a free account](https://xseal.nl/signup): Keep a saved history of every seal you create.

## Company
- [Contact & support](https://xseal.nl/contact)
- [Privacy policy](https://xseal.nl/privacy)
- [Terms of service](https://xseal.nl/terms)

## Common questions
- What does a seal prove? That a specific file existed in an exact, byte-for-byte form at the sealed UTC timestamp; if the file is later changed, verification fails. It is tamper-evidence, not a claim about authorship or the truth of the contents.
- Does XSeal store my file? No: only the SHA-256 hash and metadata (filename, size, timestamp) are stored; the file contents never leave your browser.
- Is a sealed document legally valid in the EU? A seal is strong electronic evidence of integrity and timing that is admissible under the EU eIDAS regulation; it proves the file is unchanged rather than proving signer identity.
- Is a seal an electronic signature? No. A seal proves a file's integrity over time; an e-signature proves who signed and their intent. They are complementary.
- Can I verify without an account? Yes: verification is free and open to anyone with the file and its Seal ID. An account only keeps a saved history of the seals you create.