InputTestHub

Meta Tag Analyzer

Reads a pasted page head and reports title and description width in pixels, canonical and robots problems, missing Open Graph tags and duplicates.

SEO Nothing uploaded No sign-up Free, unlimited
SEO tool
Paste something on the left to see the result.
In short Meta Tag Analyzer is a free online tool on inputtesthub.com that reads a pasted page head and reports title and description width in pixels, canonical and robots problems, missing Open Graph tags and duplicates. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.

How to use the Meta Tag Analyzer

  1. Paste your code into the input area.
  2. Choose the indentation and output options you want.
  3. Read the formatted result, then copy or download it.

About the Meta Tag Analyzer

The Meta Tag Analyzer reads a pasted page head and reports title and description width in pixels, canonical and robots problems, missing Open Graph tags and duplicates. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.

What people use it for

  • Auditing a page head before it ships.
  • Finding out why a title is being cut short in search results.
  • Catching a duplicate meta description a CMS plugin added.

Details

Title truncation≈ 580px, not 60 characters
Description truncation≈ 920px
CapitalsCut far sooner than lowercase
og:imageMust be absolute — 1200×630
Duplicate tagsBrowsers and crawlers may disagree

The maths behind it

This tool uses title and description lengths are measured as rendered pixel width rather than character count, because that is what search results actually truncate — around 580px for a title and 920px for a description. Every intermediate value is shown on screen, so the result can be checked by hand.

The pixel widths approximate Arial at Google's rendering sizes. They are close enough to plan with and are not exact — treat anything within about 5% of a limit as borderline rather than safe.

Where this tool stops

It reads the HTML you paste. It cannot see tags injected by JavaScript after load, and a page whose meta description is set client-side will look empty here while being fine to a renderer — check the rendered DOM in that case, not the source.

Frequently asked questions

How long should a title tag be?
It is a width, not a length. Google truncates around 580 pixels, and a title in capitals or full of Ms and Ws hits that at forty characters while a lowercase one survives past seventy. Character counts are a rough proxy that fails exactly on the titles most likely to be shortened — this measures the width instead.
Why does my link preview have no image?
Usually a relative og:image. Every scraper fetches that URL out of page context, so it has nothing to resolve a relative path against and simply gets nothing. It must be a full https:// URL, and 1200×630 is the size that works everywhere.
Does the Meta Tag Analyzer cost anything?
There is no cost and no cap. The Meta Tag Analyzer is not a demo of a paid product, so nothing is held back or watermarked.
Does anything I enter leave my computer?
No. The Meta Tag Analyzer runs entirely in your browser using JavaScript. Your input never reaches inputtesthub.com or any third party — open your browser's Network tab while you use it and you will see no request go out.
What formula does the Meta Tag Analyzer use?
It uses title and description lengths are measured as rendered pixel width rather than character count, because that is what search results actually truncate — around 580px for a title and 920px for a description. The full working is printed under the result, so you can follow every step rather than trusting a black box.
Who is the Meta Tag Analyzer for?
Typical uses: auditing a page head before it ships. Finding out why a title is being cut short in search results. Catching a duplicate meta description a CMS plugin added. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Is there anything the Meta Tag Analyzer cannot do?
It reads the HTML you paste. It cannot see tags injected by JavaScript after load, and a page whose meta description is set client-side will look empty here while being fine to a renderer — check the rendered DOM in that case, not the source. Knowing where a tool stops being trustworthy matters more than the cases where it works.
What figures does the Meta Tag Analyzer work from?
Title truncation is ≈ 580px, not 60 characters. Description truncation is ≈ 920px. Capitals is Cut far sooner than lowercase. These are printed on the page itself, so you do not have to take them on trust.
Will this work on a tablet?
Yes. The page is responsive and the utility works in Chrome, Safari, Firefox, Edge and Samsung Internet on both Android and iOS. There is no app to install and nothing to sign into.

Related seo tools

All 56
01

Robots.txt Tester

Tests whether a given URL is allowed or blocked by a robots.txt file, showing which rule…

02

On-Page SEO Checker

Analyses a page's HTML for title, description, headings, images, links, structured data and…

04

Image Alt Text Checker

Lists every image in your HTML and flags missing, empty, duplicated or keyword-stuffed alt…

06

Indexability Checker

Checks page HTML for anything that would stop it being indexed — noindex, canonical conflicts…

07

JSON-LD Validator

Parses JSON-LD structured data, finds every entity, and reports missing required properties…

08

Sitemap XML Validator

Checks an XML sitemap against the sitemaps.org rules: the 50,000 URL limit, absolute URLs…

09

Form Label Checker

Checks pasted form markup for inputs with no label, placeholder-only labelling, orphaned label…

10

Link Text Checker

Finds vague link text, empty links, raw URLs as link text and the same words pointing at…