How to Check Whether a List of Websites Has a Mobile Viewport Tag

To check a list of websites for mobile readiness, read the viewport meta tag on each home page. The bulk mobile friendly checker does it for up to 100 sites (500 after a free Google sign-in) and labels each row, with the tag's content.

It checks one tag. It is not a layout or usability test.

The by-hand way

View the page source and search for viewport. In a browser, open view-source on the home page and look for <meta name="viewport" ...>. A tag containing width=device-width is the standard responsive setup. You can also open the site on a phone and judge it by eye.

That is a minute per site, which is fine for five competitors and not for a list of prospects.

Step 1: paste the websites

Paste one site or a list, one per line. Emails and URLs work too. You can also upload a CSV. No account is needed for up to 100 a run; sign in with Google for up to 500.

Step 2: run the check

Each home page is requested once, over HTTPS and then HTTP, five sites at a time. The tool reads the page source and runs no JavaScript.

Step 3: read the result

Result	What it means	Flagged
Responsive viewport tag	width=device-width is present	No
Responsive, zoom blocked	device-width, but visitors cannot zoom	Yes
Viewport without device-width	A tag exists but no device-width	Yes
Fixed-width viewport	A set width such as a number of pixels	Yes
No viewport tag	None in the home page	Yes

Each row shows the tag's content and the evidence. Without width=device-width a phone typically shows a desktop-width page shrunk down; see MDN's viewport meta tag guide and web.dev on responsive design basics.

Why check it across a list

• Agencies treat a missing tag as a sign an old site needs a rebuild.
• Lead-list owners use it as one hint that a site is no longer maintained.
• Researchers compare competitors' sites quickly.

For a company-level verdict that adds site status and mail records, see removing dead companies from a lead list. To read page titles and descriptions across the same list, see checking page titles and meta descriptions in bulk.

What this check cannot do

• It reads one meta tag, not a layout or usability test.
• A tag added by JavaScript is not seen.
• Only the home page is read.
• The limit is 100 sites a run without an account and 500 signed in.

If the company is still alive, check the contact emails

A site that answers does not mean a given mailbox exists. Once you know which companies are still around, check the addresses on your list on the verify page: the first 100 email checks are free with a Google sign-in, no card. Each comes back valid, risky or invalid with a reason, and nothing is sent to anyone on the list. To confirm every site still answers first, run the list through the bulk website status checker. For larger or recurring lists, see bulk email verification, list cleaning and pricing.

Check your list now

Paste your sites into the bulk mobile friendly checker.