Bulk mobile-friendly checker: which websites have no viewport tag for phones?
In short: Paste a list of websites and check each home page's viewport meta tag: responsive, fixed width, zoom blocked or missing, with the tag's content, as a CSV. Limit: One meta tag, not a layout or usability test.
A bulk mobile-friendly checker reads each home page's viewport meta tag, the first thing a page needs to fit a phone screen. Paste up to 100 websites, or 500 after a free Google sign-in; each row says Responsive viewport tag, Fixed-width viewport, Responsive with zoom blocked or No viewport tag. It is one signal, not a layout test. Download the CSV.
Price: this tool is free. Checking a whole email list is from $9/mo, and the first 100 checks are free with Google, no card. Check your list free nowSee pricing
Sample result
acme.example has a responsive viewport tag; initech.example has none.
- Site
- globex.example
- Viewport
- width=1024
- Problem
- Fixed width
What this means for you
A viewport tag is one signal that a page was built for phones, not a usability test.
- Viewport meta tag read
- Fixed width and zoom flagged
- The tag's content shown
- Page not rendered
- device-width
- Fixed
- CSV
By SimpleVerifier Team · Last updated
Prospecting websites that need work?
- Paste the sites here: 100 a run, or 500 after a free Google sign-in. Filter to the rows without a proper viewport tag and download the CSV.
- Upload or paste it at /verify. Every address gets a live mailbox check, and the first 100 email checks are free with a Google sign-in, no card.
How do I check many websites for a mobile viewport tag?
- Paste up to 100 sites, or 500 after a free Google sign-in, one per line; emails and URLs work too. You can also upload a CSV.
- Press Check mobile viewport tags. Each home page is requested once, over HTTPS and then HTTP, five sites at a time.
- Read each row: Responsive viewport tag, Fixed-width viewport, Viewport without device-width, Responsive with zoom blocked or No viewport tag, with the tag's content.
- Filter to the flagged rows and download the CSV.
Example
- You enter
- Three sites:
acme.example(width=device-width),globex.example(width=1024) andinitech.example(no viewport tag). - You get
- acme.example: Responsive viewport tag. globex.example: Fixed-width viewport, width=1024. initech.example: No viewport tag. Download the CSV.
- Limits
- Up to 100 a run without an account and 500 when signed in with Google, counted over a minute. 10 sites a request; one GET of the home page from our server, no cookies, nothing stored.
What does the viewport tag do?
The viewport meta tag tells a phone how wide to draw the page. Without width=device-width a phone typically shows a desktop-width page shrunk down (MDN: viewport meta tag). A fixed width, or user-scalable=no, which stops visitors zooming, is flagged too.
The tag is one signal. A page can have it and still be hard to use, and a site built by JavaScript may add it later, so we don't see it.
Why look at it across a list?
Agencies use a missing viewport 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.
For a live-or-down check of every site, use the bulk website status checker; for who hosts a site, the website host checker.
What do you do with the flagged rows?
Open the site on a phone, then decide whether it is a pitch or a skip.
Before you email anyone on a list, verify the addresses.
Who uses this tool, and for what?
- Web agencies
- Find old sites that need a rebuild.
- SEO consultants
- Flag prospects missing the basic mobile tag.
- Lead-list owners
- Spot sites that look unmaintained.
- Site owners
- Check a set of domains after a theme change.
What can’t this tool tell you?
- One meta tag, not a layout or usability test.
- A tag added by JavaScript isn't seen.
- Only the home page is read.
- Up to 100 sites a run without an account, 500 signed in.
Common questions
- How do I check if a website is mobile-friendly?
- Paste it into a bulk mobile-friendly checker like this one. It reads the viewport meta tag, one signal that a page was built for phones.
- Is this mobile-friendly checker free?
- Yes. 100 sites a run without an account, 500 after a free Google sign-in, with no card, and a CSV download.
- Is this the same as Google's mobile test?
- No. It reads one tag and doesn't render the page.
- Why is zoom blocked flagged?
- user-scalable=no stops visitors zooming, which hurts people who need larger text.
- Does a viewport tag make a site mobile-friendly?
- No. It's necessary, not sufficient.
- Why does a modern site show No viewport tag?
- Its tag may be added by JavaScript, which we don't run.
Sources
A tidy list can still be full of dead addresses.
Extracting, deduplicating and syntax checks all work on the text of an address. None of them can tell whether the mailbox exists. Only the server that hosts it can answer that, through an SMTP check, and that is what the paid product does.
- Upload the cleaned file as it is: CSVs up to 100,000 rows
- A real SMTP mailbox check on every row, with catch-all detection
- Small list? Starter at $9/mo covers 2,500 emails a month, cancel anytime
Plans from $9 a month, cancel anytime, no contract. Sign in with Google and your first 100 email checks are free, no card. The free tools stay free either way.