Free Viewport Meta Tag Checker — Validate Mobile Meta Tags
One wrong viewport tag can break your whole mobile experience — and Google notices. This free checker parses the viewport meta tag from your page’s <head>, validates every property, and flags the classic mistakes, including the accessibility-hostile maximum-scale=1.0 that blocks pinch-zoom.
Viewport Meta Checker
Validate your viewport meta tag — catch mobile and accessibility mistakes instantly.
100% Free Forever
No Sign-up
No Credit Card
Private — files never leave your browser
Unlimited Use
1 Paste your page’s
HTMLRight-click your page → View page source → copy from <head> to </head>.
2 Settings
Accessibility-first checks
Flags anything that blocks pinch-zoom or harms low-vision users — Google penalizes these too.
Mobile SEO checks
Verifies the tag Google’s mobile-first index expects to see.
3 Check viewport
Working…
✅ Done — your viewport report
How it works
- Step 1 — Paste your page’s <head> HTML. Parsing happens locally; nothing is uploaded.
- Step 2 — Toggle accessibility and mobile-SEO check groups.
- Step 3 — Get a pass/fail verdict on every viewport property plus the exact fixed tag to use.
Everyday uses
- Web developers — verify responsive templates emit a correct viewport tag.
- Bloggers — fix the #1 cause of “page not mobile-friendly” warnings.
- Agencies — audit client sites for zoom-blocking accessibility violations.
- SEOs — confirm the mobile-first index sees a proper width=device-width tag.
Rule: the only viewport most sites need is width=device-width, initial-scale=1.