Terms of Service

Last updated: 18 October 2026. XSeal is operated by Website Holding.

By using XSeal you agree to these terms. If you are using XSeal on behalf of an organisation, you confirm you have authority to accept these terms for it.

The service

XSeal computes a SHA-256 hash of a file you choose, records a UTC timestamp, and returns a signed certificate (a “seal”). Verification recomputes the hash and checks the signature to report whether a file matches a seal. Sealing several files together (bulk sealing) gives each file its own seal plus one combined, signed manifest covering the whole batch; everything in this section applies equally to a manifest.

What a seal proves, and what it does not

A seal is evidence that a specific file existed in an exact byte-for-byte form at the sealed time. It does not assert authorship, ownership, legality, or the truth of a document’s contents, and it is not a qualified electronic signature under eIDAS.

Eligibility

You must be at least 16 years old and able to enter into a binding agreement to create an account. Give a working email address you control; it is how we reach you about your account. Anyone may verify a seal without an account.

Acceptable use

• Do not use XSeal to seal unlawful content or to misrepresent what a seal proves.
• Do not attempt to disrupt, reverse-engineer, or overload the service, or to get around its rate limits or plan limits.
• Keep your API keys secret. You are responsible for requests made with them; revoke a key from your dashboard as soon as you think it has leaked.

Deleting seals

You can delete a seal from your dashboard at any time. Deletion is permanent: the seal's certificate, verification link, QR code and badge stop working, so keep a seal for as long as you may need to prove the document.

Accounts & billing

You are responsible for activity under your account and for keeping your credentials secure. XSeal has three plans: Free (free, up to 25 seals a month), Pro (€12 a month, 1,000 seals a month) and Business (€49 a month, 10,000 seals a month and the sealing API), as described on the pricing page. Seals beyond your plan's monthly limit are refused until the next calendar month. Paid plans are billed by Website Holding as merchant of record, which also handles VAT, on a monthly basis until cancelled; verification remains free. Self-serve card checkout is not yet live — an in-app upgrade request is reviewed and granted directly by the operator, and no card is charged until it is. Once checkout is live, refunds follow Website Holding's standard refund policy; contact us within 14 days of a charge to request one.

Availability & liability

XSeal is provided “as is.” We work to keep it available and accurate but do not warrant uninterrupted service. To the extent permitted by law, our liability is limited to the fees you paid in the prior three months.

Intellectual property

The XSeal service, software, branding and documentation remain our property; these terms grant you a limited, non-exclusive right to use the service, not to copy or resell it. The files you seal and the contents of your documents remain entirely yours (we never store them: most seals receive only the hash your browser computes, and the rare upload from a browser that cannot hash is hashed in memory and discarded) and the seal certificate we issue is yours to keep and share.

A seal's file name and signer appear on its public verification page. If you believe something shown on XSeal infringes your copyright or other rights, tell us through the contact form or the report page with the page address and the basis of your claim; we review every notice and remove material that infringes.

Termination

You may stop using XSeal and close your account at any time; to cancel a paid plan or close your account, contact us. We may suspend or terminate access that breaches these terms or the law. Seals already created remain verifiable, and the clauses that by their nature should survive (what a seal proves, intellectual property, disclaimers and liability) continue to apply after termination.

Changes to these terms

We may update these terms as the service evolves. When we make material changes we will update the effective date above; continuing to use XSeal after a change means you accept the updated terms.

Governing law

These terms are governed by the laws of the Netherlands, and the courts of the Netherlands have jurisdiction, except where mandatory consumer law gives you the right to bring a claim in your own country of residence.

Contact

Questions about these terms? Use the contact page.