OpenBIMIGitHub

Free · Open source · Private by design

Put your brand in the inbox.

Set up BIMI with clear, independent tools that check every public requirement—without an account, a sales call, or a black box.

Live DNS and logo checks Exact records to publish Nothing stored
Live public check
No sign-in

Is your domain ready for BIMI?

Check DMARC, the BIMI record, hosted SVG, and mark certificate in one pass.

Using a custom selector?

No account. We only query public DNS and published BIMI files.

Built around the public standard No credentials requested Apache 2.0Inspect every line

The open toolkit

Everything between “maybe” and published.

Each tool works on its own. Together they cover the full public BIMI setup path.

01

Domain checker

Follow the public chain from DMARC policy to assertion record, hosted SVG, and certificate.

Check a domain 02

SVG validator

Inspect your logo locally for Tiny PS structure, unsafe content, file size, and inbox compatibility.

Validate a logo 03

Record generator

Build a correct TXT name and value, then copy both into any DNS provider.

Build your record

The whole path

Four steps.
No mystery.

BIMI sits on top of healthy email authentication. OpenBIMI shows what is public, what is missing, and what still needs a human decision.

Read the complete guide
  1. 1

    Enforce DMARC

    Authenticate legitimate mail and move the policy to quarantine or reject at full coverage.

  2. 2

    Prepare the SVG

    Convert the logo to the restricted Tiny PS profile and design for small, masked crops.

  3. 3

    Add authority evidence

    Use a VMC or CMC when the mailbox providers you care about require certification.

  4. 4

    Publish and verify

    Add the BIMI TXT record, wait for DNS propagation, and check the public result.

Honest by design

A passing record is a signal, not a promise.

Mailbox providers still apply reputation, volume, certificate, and local display policies. OpenBIMI separates technical validity from provider eligibility so you know exactly what a result proves.

  • Current public DNS and file validation
  • Clear standards versus provider-specific guidance
  • No invented guarantee that a logo will appear

Straight answers

Questions, answered.

Still unsure? Ask in the public project discussion—someone else probably has the same question.

Open discussions
Is OpenBIMI really free?+

Yes. The checker, record generator, SVG validator, and guides are free and open source. There is no account or usage paywall.

Will a passing check guarantee my logo appears?+

No. BIMI gives providers a verified signal, but each mailbox provider decides whether and how to display an indicator using its own reputation and eligibility policies.

Do I need a VMC or CMC?+

The core BIMI record supports self-asserted logos, but Gmail and several other major providers require a mark certificate. Support without one is limited.

Does OpenBIMI change my DNS?+

No. We inspect public records and generate values for you to copy. You stay in control of every DNS change.

Ready when you are.

Start with the domain you send from.

Run the free check