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For official communications

Let anyone confirm a notice came from you and has not changed.

Sign a report, policy, filing, or contract before it leaves your team. Each person who gets it can check who signed it and if it changed.

Start free with no card. Anyone who receives a signed file can check it without an account.

$0

for a recipient to check a file

No account

needed by the recipient

One step

after approval and before the file goes out

For each key file

Let the file answer the trust question.

Customers, staff, lenders, and partners can check it on their own. Your team does not have to reply.

01

Prevent spoofing and forgery

Recipients verify your organization as the signer. One click exposes an impersonator.

02

Detect tampering

Any change to the document after signing is caught automatically. Altered files fail verification instantly.

03

Create an evidence trail

Every signed file is a timestamped record tied to your organization. Ready for audits, disputes, and litigation.

Mark in action

See a signed image pass, then catch a change.

The verifier accepts the signed image. Add one object, check it again, and see the mismatch.

What the recipient sees

A clear answer in seconds.

The proof stays with the file by email, in a portal, or on a public site.

Signed file record

Example result
Signed by
Example Organization
Signed on
11 Mar 2026, 14:07 UTC
File check
Valid. No change found.

The sample above shows what every recipient sees when they verify your file.

Start the official-file workflow

See it as a recipient

Open the same proof you will send.

Run the live sample before you change how your team sends files.

One-page Mark guide

Share the signing and check flow with legal, records, or the team that sends the files.

Download the walkthrough

How it works

Add one step to the way you send files.

Keep the review, sign-off, and send tools you use now.

  1. 01

    Sign the final file with Mark

    Upload the approved version. Mark binds your organization's identity and a timestamp to the file in seconds.

  2. 02

    Share the check link

    Send the file by email, portal, data room, or archive. Include the check link so every recipient can verify it on their own.

  3. 03

    Track every verification

    See who checked the file, when, and whether it passed. Build a compliance-ready audit trail without extra work.

Proof details

Why organizations choose signed files.

Every signed file carries proof that travels with it, no matter how it is shared.

  • Recipients verify the signer and file integrity in one click, with no account or software required.
  • Signed records hold up under audit, legal discovery, and regulatory review.
  • Works with the tools your team already uses: email, portals, data rooms, and archives.