On-page SEO

SERP Snippet Preview

Type a title and meta description to see how the snippet will look in Google search results — and exactly where it gets truncated. Length is measured in pixels at the font sizes Google renders, because Google cuts snippets by width, not by character count.

Switch between desktop and mobile: the two have different width limits, and a title that fits one often does not fit the other.

FreeNo signupRuns in your browserUpdated October 2026

SERP Snippet Preview

Runs in your browser — nothing you enter leaves this page.

Page URL

Title tag

Fits · 0/580 px · 38 characters

Meta description

Fits · 0/920 px · 93 characters

Show date in snippet

Preview · Desktop

Eexample.comhttps://example.com › blog › schema-markup

Free Schema Markup Generator (JSON-LD)

Generate valid JSON-LD for Article, FAQ, HowTo and more. Required fields checked as you type.

Seonix article editor showing an AI-written article with an SEO score of 98 and a readability score of 85 — Every article Seonix writes is scored for SEO and readability in the editor before it goes live.

How it works

How to use it

01
Enter the page URL
The URL only shapes the breadcrumb line shown above the title — nothing is fetched or sent anywhere.
02
Type your title and description
The preview updates as you type. The width bar turns amber as you approach the limit and red once the text will be cut.
03
Check both devices
Toggle desktop and mobile. Aim to fit both; if you cannot, favour the device that brings you more traffic.

Honest notes

How accurate is this preview?

Widths are measured with the browser's own text metrics at the sizes Google uses — 20px for desktop titles, 14px for descriptions — which is far closer to reality than counting characters. Wide letters like W and M eat space that i and l do not.

Google rewrites titles and descriptions when it judges its own version a better match for the query — studies put that at roughly half of all snippets. A preview shows your intended text, not a guarantee of what will be displayed.

Everything runs in your browser. Nothing you type is sent to a server or stored.

Seonix does this on autopilot

A title and description written for every article

Seonix drafts the title tag and meta description with each article it writes and checks their length against what search results display — no counting characters post by post.

Analyze my site free

For your stack

SEO on autopilot for the site you have

Seonix researches, writes and publishes articles — and keeps the technical side in check — wherever your site lives.

WordPress sites

The free Seonix plugin connects in one click: articles publish as native posts, and SEO fixes and llms.txt are handled for you.

WordPress SEO automation

SaaS products

Your AI coding agent connects your app to Seonix from one prompt; keyword-backed articles then publish to your own domain on schedule.

SaaS SEO on autopilot

Custom-built websites

No WordPress needed: your site exposes one small endpoint and articles arrive as native pages in your own design.

SEO for custom websites

Also onShopify Webflow Wix Ghost

Frequently asked questions

How long should a title tag be?

Around 580 pixels on desktop and 920 on mobile, which usually lands between 50 and 60 characters. Character counts are a rule of thumb; the pixel bar in this tool is the real constraint.