Pre-send Email QA · Free · No install

Stop Costly Email Mistakes Before They Hit Your List

Instantly catch broken links, unresolved merge tags, staging URLs, duplicate CTAs, and missing unsubscribe links — in under 1 second. No account. No install.

⚠ One mistake on a 300k list can cost $36,000+ in lost revenue and damaged sender reputation.
Free forever  ·  Works with Klaviyo, Mailchimp, and any ESP
$36k
One bad email can cost you this on a 300k list
7
Critical error types caught automatically
<1s
Full QA report in under one second
0
Zero setup. Paste your HTML and go.
The tool

Run your QA check now

Paste your rendered email HTML below. Add the subject line and your production domain for the most complete report.

Email QA Scanner Waiting for input
Email Subject Checks for filename patterns
Production Domain For resolving relative links
Email HTML
0 chars
What we check

Automatic checks vs. human review

We automatically flag the embarrassing — and expensive — mistakes that slip through even experienced teams. Some errors require human judgment; we flag those too so nothing slips through before your subscribers see it.

✓ Caught automatically
✓
Duplicate URLs across different CTAs
Flags when two different buttons link to the same URL — the most common copy-paste mistake in multi-product campaigns
✓
Unresolved merge tags
Catches {{variable}}, *|MERGE_TAG|*, and ${var} left unreplaced in links or subject lines before your subscribers see them
✓
Staging / dev environment URLs
Detects staging., dev., qa., localhost and similar patterns that should never reach production sends
✓
Placeholder # links
Flags href="#" — these are not clickable in Outlook, Gmail, or Apple Mail and look broken to subscribers
✓
Missing unsubscribe link
Required by CAN-SPAM, GDPR, and most national anti-spam laws — sending without one is a legal and deliverability risk
✓
Subject line filename patterns
Catches internal filenames or date prefixes left as the subject — e.g. 20251225_CampaignName.html instead of your actual subject line
✓
Missing image alt text
Flags functional images without alt text — critical for accessibility and when images are blocked in email clients
→ Requires human review
→
Single wrong URL that is unique and live
If a CTA links to the wrong page but the page actually loads, the tool cannot detect it — always verify destinations manually before sending
→
URL leads to wrong destination page
A valid URL pointing to the wrong product or landing page requires live page title verification — coming in Pro
→
Broken countdown timers
Dynamic content rendered as images or JavaScript — the tool sees your HTML only, not the final rendered state
→
Wrong region or location labels
A venue listed under the wrong city is a content error invisible to any automated HTML checker
→
Authentication-walled destinations
Login-required pages cannot be verified even with live HTTP checks — manual review required
SendTest Pro (coming soon) adds live HTTP checks with page title verification — catching cases where a unique URL resolves but leads to the wrong destination. Join the waitlist →
How it works

Clean sends in 60 seconds

No account. No install. Works with any ESP.

STEP 01
Export your email HTML
In your ESP, find the option to view or export the rendered HTML of your campaign.

In Klaviyo: Preview → </> HTML
In Mailchimp: Preview → Edit HTML
In Salesforce MC: View Source in preview mode
STEP 02
Paste and run
Paste the HTML into the box above. Optionally add your subject line and production domain for the most complete report.

Click Run QA Check. Results appear in under 1 second.
STEP 03
Fix and send with confidence
Review the report. Fix any critical issues flagged in red. Re-run to confirm everything is clean.

When the verdict shows Clear to Send — you're good to go.
Fix the red flags. Re-run in seconds. Send with confidence. →
Pricing

Free to start. Pro when you need it.

SendTest Free catches the errors that cause apology emails. Pro adds live destination verification for teams who send at scale.

Free
$0 forever
For individual marketers and small teams who want peace of mind before every send.
  • ✓ All 7 automatic error checks
  • ✓ Duplicate URL detection
  • ✓ Merge tag validation
  • ✓ Staging URL detection
  • ✓ Unlimited scans
  • ✓ No account required
Pro — Launching Soon
$99 / month
For teams who need live destination verification and ESP workflow integration.
  • ✓ Everything in Free
  • → Live HTTP link verification
  • → Page title vs. CTA matching
  • → Klaviyo integration
  • → Team scan history
  • → Priority support

"Built for email teams who never want to send an apology email again."

Get early access to SendTest Pro
Live HTTP checks · Page title vs. CTA matching · Klaviyo integration · Team reports.
First 50 on the waitlist get 20% off launch month.
✓ You're on the list. We'll be in touch.
SendTest catches structural email errors. It does not verify that URLs lead to the correct destination page. What we check →