Email Personalization Tag Checker

Email Personalization Tag Checker scans email copy and HTML for double-curly-brace merge tags such as {{first_name}}. It identifies valid tags, malformed syntax, unmatched braces, duplicate variables, whitespace issues, and variables that may lack a fallback value.

Personalization errors are highly visible: a raw tag, blank greeting, or wrong placeholder can make a carefully designed campaign feel careless. Use this free browser-based checker as part of pre-send email QA, then verify the final message in your email service provider’s preview and test-send tools. Your content is analyzed locally and never uploaded.

• Merge-tag detection: Finds double-curly-brace variables in plain text or email HTML.
• Syntax validation: Flags unmatched braces, empty tags, spaces around tag names, and invalid characters.
• Fallback review: Highlights simple tags that do not appear to use a default or fallback value.
• Duplicate-tag summary: Lists repeated variables so you can confirm each use is intentional.
• Tag inventory: Shows every detected tag, its line number, and status.
• Private local checking: Run the analysis entirely in your browser with no account or upload.

1. Copy your final email copy or HTML from the campaign editor or exported template.
2. Paste it into the checker and select your fallback expectation.
3. Review errors first, especially unmatched braces, empty tags, and malformed variable names.
4. Review warnings for tags without fallback values or repeated tags.
5. Fix the template in your ESP, then use its recipient preview and a test send to confirm that valid data is substituted correctly.

Valid simple tag: Hi {{first_name}}, is structurally valid for platforms that support this syntax, but it can produce a blank value when the field is missing.

Fallback example: Hi {{first_name | default: "there"}}, includes a fallback-style expression. Check your ESP documentation because fallback syntax varies by platform.

Malformed tag: Hi {{ first name }}, contains spaces in the variable name and is likely invalid. Use your platform’s actual field key, such as {{first_name}}.

• Prevent embarrassing sends: Catch raw variables and broken greetings before recipients see them.
• Improve message resilience: Identify fields that should have a default value for incomplete contact records.
• Speed up QA: Audit all personalization tags in one scan instead of reading every line manually.
• Support reliable segmentation: Make template structure easier to review before campaigns use dynamic data.
• Keep campaign content private: Analyze drafts locally in your browser.