How it works
- 1
Enter your domain
Type your domain name. The tool queries _bimi.{domain} and _dmarc.{domain} simultaneously.
- 2
Record is parsed and checked
Each BIMI field (v=, l=, a=) is validated. The logo URL is tested for accessibility and shown as a preview.
- 3
See your readiness score
A checklist shows which requirements pass, which fail, and exactly what to fix to enable BIMI in your target clients.
BIMI Validator
Validate Brand Indicators for Message Identification (BIMI) — the standard that shows your brand logo next to emails in Gmail, Apple Mail, and Yahoo.
Queries _bimi.{domain} and _dmarc.{domain} via Cloudflare DoH. 0/20 free today
🛡️ Verify zero uploads — open DevTools → Network tab
Open your browser's DevTools (F12), go to the Network tab, and use this tool. You will see zero outbound requests — all processing runs inside your browser sandbox via WebAssembly or pure JavaScript. Nothing you paste or upload is ever sent anywhere.
Use cases
Enable logo in Gmail
Gmail requires BIMI + DMARC p=reject/quarantine + a Verified Mark Certificate. This tool shows which step you're on.
Quick BIMI audit for clients
Email marketers can check any domain's BIMI status before a campaign to ensure brand logos show up in inboxes.
Diagnose why logo isn't showing
If your BIMI was working but the logo stopped appearing, check if the _bimi record, logo URL, or VMC certificate changed.
Common mistakes
4 pitfalls to avoid
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Common mistakes
4 pitfalls to avoid
1Using a regular SVG instead of SVG Tiny P/S
✗ Wrong: Uploading a complex SVG with gradients, filters, or external fonts — these fail BIMI validation
✓ Fix: Use SVG Tiny Portable/Secure format. Convert with online tools or Adobe Illustrator's SVG Tiny export. The SVG must be fully self-contained.
2Setting DMARC to p=none
✗ Wrong: Having a DMARC record but with p=none — this is the monitoring mode and doesn't qualify for BIMI
✓ Fix: Upgrade DMARC to p=quarantine or p=reject. Start with pct=10 to roll it out gradually: v=DMARC1; p=quarantine; pct=10; rua=mailto:dmarc@yourdomain.com
3Pointing l= to a non-public URL
✗ Wrong: The SVG logo is hosted behind authentication or on a private CDN that blocks bot user-agents
✓ Fix: Ensure the l= URL returns HTTP 200 with Content-Type: image/svg+xml for unauthenticated GET requests from any IP address.
4Getting a VMC for the wrong domain
✗ Wrong: Purchasing a VMC for www.yourdomain.com instead of yourdomain.com (the root domain used in From: headers)
✓ Fix: The VMC must match the domain in your email From: address — typically the root domain without www.
Frequently Asked Questions
What is BIMI and which email clients support it?
BIMI (Brand Indicators for Message Identification) is a standard that lets companies display their logo next to authenticated emails in the inbox. Supported clients: Gmail (requires VMC), Yahoo Mail (no VMC required), Apple Mail 16+ (no VMC required), Fastmail. Outlook does not yet support BIMI.
What is a VMC and do I need one?
A Verified Mark Certificate (VMC) is a digital certificate issued by a Certificate Authority (DigiCert or Entrust) that verifies your right to use your logo. Gmail requires a VMC. Apple Mail and Yahoo support 'Basic BIMI' which only requires an SVG logo — no VMC needed.
What DMARC policy is required for BIMI?
BIMI requires DMARC with p=quarantine or p=reject. A policy of p=none doesn't qualify. The DMARC record must also be at _dmarc.{yourdomain}, not just on a subdomain.
What are the SVG logo requirements for BIMI?
The SVG must be: hosted at an HTTPS URL, in the SVG Tiny Portable/Secure (SVG P/S) format, a square aspect ratio (1:1), have a viewBox attribute, and have no external references (self-contained). Gmail additionally requires the SVG to be accompanied by a VMC certificate.
How long does it take for BIMI to start showing in Gmail?
After adding a valid BIMI record with a VMC, it can take 24–72 hours for Gmail to pick it up. Gmail also applies its own verification process — the logo appears incrementally to a growing percentage of recipients before rolling out fully.
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Official specifications & references
BIMI Group — Official BIMI Specification
The authoritative BIMI spec covering record syntax, SVG requirements, and VMC format.
RFC 9051 — Internet Message Format
Base RFC for email message format — BIMI builds on top of this.
Google — BIMI Setup Guide
Official Google Workspace guide for setting up BIMI with VMC for Gmail logo display.
DigiCert — VMC Certificates
One of two CAs that issue Verified Mark Certificates (VMCs) for BIMI.
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