Insert, edit and preview custom HTML in the Gmail compose window. Templates included. 100% local, no tracking.
Users
22
+10 in 30 days
Rating
0.0 / 5
unchanged in 30 days
Ratings
0
0 in 30 days
Store rank
#145K
#121K among extensions
Version
1.0.0
updated 2 Jul 2026
Users
monthly, 3 months
Latest, 15 Oct 2026:22 usersMove the mouse over the chart for any month
Ratings count
monthly, 3 months
Latest, 15 Oct 2026:0 ratingsMove the mouse over the chart for any month
The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.
About Mail HTML Injector
Mail HTML Injector adds a simple "</>" button to the Gmail compose toolbar so you can insert, edit and preview custom HTML right inside your email — perfect for newsletters, signatures and rich mailings.
FEATURES
• "</>" button in the compose toolbar — works in popup, full-screen and inline reply compose windows.
• HTML editor with a side-by-side code pane and a live, sanitized preview.
• Bidirectional editing — the editor loads the current HTML of your email so you can tweak what's already there, not just paste new co
• Two insertion modes — "Insert at cursor" or "Replace body".
• Template library — save your HTML delete it. Stored locally on yourdevice.
• Enable/disable toggle in the exten
PRIVACY FIRST
• 100% local. No tracking, no analytics, no external requests, no remote code.
• Your templates are stored only on ocal) and are never uploaded orsynced. • HTML is cleaned with the DOMPurifyripts, iframes, inline event handlersand javascript: URLs are stripped, while the <style> blocks and inline CSS that HTML email relies on are kept intact.
PERMISSIONS
• storage — to save your HTML templates locally.
• access to mail.google.com — to addil. Nothing else.
Gmail and Google are trademarks of Gan independent project and is notaffiliated with, endorsed by, or sponsored by Google.