Google Ads responsive search ads allow up to 15 headlines (30 chars each) and 4 descriptions (90 chars each).

Why is "warn" different from "fail"?

Fail means the line exceeds the limit and Google will reject or truncate it. Warn means you are within 10% of the limit, which usually means there is no room for translation, dynamic insertion, or punctuation tweaks.

Does this match the live Google Ads counter?

Yes — both use plain character counts (not byte length), so the number you see here matches what Google shows in Ads Manager.

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Google Ads Headline Checker

Check headline and description length with pass/warn/fail.

Headlines (one per line, up to 15 · 30 chars)

0/15 headlines

Descriptions (one per line, up to 4 · 90 chars)

0/4 descriptions

Validation results

Paste at least one headline or description above to see character counts, pass/warn/fail badges, quality flags, and an ad preview.

What is Google Ads Headline Checker

Google Ads silently truncates copy that breaks its character limits. The checker counts each headline (30 chars) and description (90 chars) in real time, flags anything close to the cap, and previews how different combinations will render on the SERP before you push them live.

The Google Ads Headline & Description Checker is a copywriting validator built specifically for responsive search ads (RSAs). Paste your draft headlines and descriptions and the tool counts characters per line, flags anything over the cap, and warns on entries that are tight enough to be at risk of truncation on mobile.

It validates the two character limits Google actually enforces — 30 characters per headline, 90 characters per description — and the two count limits — up to 15 headlines and up to 4 descriptions per RSA. It works on pasted text, so it fits into the part of the workflow where copy is being drafted, not just the moment of upload.

The intended user is the person writing the ad: a paid search specialist, a copywriter on an in-house team, or an agency strategist preparing copy variants for client review before anything is loaded into Google Ads Editor.

How to use Google Ads Headline Checker

1Paste headlines, one per line, up to 15 (30 chars each).
2Paste descriptions, one per line, up to 4 (90 chars each).
3Review pass/warn/fail badges per line.
4Use the SERP preview to sanity-check the rendered ad.

Why Google Ads Headline Checker matters

Responsive search ads succeed or fail on the variety of the assets they're given. Google's system rotates combinations of your headlines and descriptions and learns which ones perform best — but it can only choose from the assets you provide. If half of your headlines are rejected at upload because they're over 30 characters, you've cut the system's learning surface in half before the campaign even starts.

Good RSA copy hygiene looks like a full asset pipeline: 15 unique headlines that hit different value props, 4 distinct descriptions that don't repeat the same phrase, and no surprises at upload. Validating length and structure before paste-to-platform removes one of the most common reasons RSAs end up with a Poor Ad Strength score.

Google Ads Headline Checker use cases

Drafting RSA copy from scratch

Use the checker as your writing surface. Add headlines one at a time and watch the badge flip from warn to pass as you tighten phrasing. By the time you're done, every asset already meets the platform's limits.

Reviewing copy from an agency or freelancer

Paste a delivered batch into the checker before forwarding to the platform. You'll spot any over-limit lines immediately and can push back with specific rows to revise rather than rejecting the whole deliverable.

Migrating ETAs to RSAs

Old expanded text ad headlines often run beyond 30 characters. Drop the legacy copy into the checker, identify which lines need rewriting, and fix them in place so the migrated RSA passes upload on the first try.

Localizing copy into multiple languages

Translations can balloon character counts unpredictably. Paste a localized batch in to flag languages where headlines bust the 30-character limit so you can request shorter equivalents before launch.

Example

A 31-character headline like "Free Returns On Every Order Today" flips to "fail" so you fix it before Google truncates it to "Free Returns On Every Order Tod...".

FAQ

What are the limits?: Google Ads responsive search ads allow up to 15 headlines (30 chars each) and 4 descriptions (90 chars each).
Why is "warn" different from "fail"?: Fail means the line exceeds the limit and Google will reject or truncate it. Warn means you are within 10% of the limit, which usually means there is no room for translation, dynamic insertion, or punctuation tweaks.
Does this match the live Google Ads counter?: Yes — both use plain character counts (not byte length), so the number you see here matches what Google shows in Ads Manager.