SEO Reference

Meta Tag Length Guide

Google truncates by pixel width, not character count, which is why every character based rule of thumb is approximate. I still use character targets because they are usable in a CMS, but I check the wide characters by eye.

Core meta tags
TagCharacter targetApproximate pixel limit
Title tag, desktop50 to 60About 580px
Title tag, mobile50 to 60About 550px
Meta description, desktop150 to 160About 920px
Meta description, mobile110 to 130Narrower display
H1No search limitWritten for readers
Open Graph and social tags
TagPurposeGuidance
og:titleTitle in social previewsAround 60 characters
og:descriptionDescription in social previewsAround 155 characters
og:imagePreview image1200 x 630, under 5MB
og:urlCanonical URL for sharingAbsolute URL
og:typeContent typewebsite or article
twitter:cardCard style on Xsummary_large_image is typical
Other head elements worth auditing
ElementPurpose
Canonical linkNames the preferred URL for duplicate content
Meta robotsControls indexing and snippet behaviour
hreflangMaps language and region variants
Viewport metaRequired for mobile rendering

Notes

Google rewrites titles frequently, often using your H1 or on page text instead of the title tag. That is not a failure to fix by cramming keywords in. It usually happens when the title is generic, keyword stuffed, or does not match the page content, so the fix is a more accurate title, not a longer one.

The meta description is not a ranking factor, but it is the ad copy for your organic listing, and Google will generate its own snippet if yours is unhelpful. Write it to answer the query and set expectations, and accept that Google may still substitute a passage from the page.

Character targets are proxies for pixel width. A title full of capital letters and W characters will truncate well before 60 characters, while a title of narrow lowercase letters may survive past it. If a title matters, preview it rendered rather than counting.

Google adjusts snippet lengths and display behaviour periodically, and mobile and desktop differ. Google Search Central documentation is the source of record for what is supported, though Google does not publish exact pixel limits.

Frequently asked questions

Does the meta description affect rankings?

No. Google has stated it is not a ranking factor. It affects click through rate from results, which is worth optimizing on its own terms.

Why is Google showing a different title than mine?

Google rewrites titles when it judges another string better describes the page for the query. Common causes are boilerplate, keyword stuffing, or a title that does not match the visible H1.

Do I need Open Graph tags if I have a title tag?

Yes, if you care how your links look when shared. Social platforms read og tags, not your title tag, and without og:image most shares render without a preview image.

Official sources

Platforms change specifications without notice. Check the primary documentation before a launch that depends on an exact value.

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SERP Snippet PreviewSee exactly how your title and meta description render in Google, with pixel-accurate truncation warnings.Tool · shares pixel, titleMeta Tag GeneratorFill in a form, get clean copy-paste HTML for title, description, Open Graph, and Twitter tags with live length checks.Tool · shares title, tagGoogle Ads SpecsGoogle Ads character limits for responsive search ads, Performance Max assets, image sizes and video requirements.Reference · shares google, charactersEmail Subject Line LengthHow many characters of an email subject line and preheader are visible across Gmail, Outlook, Apple Mail and mobile inboxes.Reference · shares length, characters

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