What's the Character Limit for a Google Ads Callout Extension?

A Google Ads callout is limited to 25 characters, per Google's own Ads API field reference for the callout asset — and that cap drops to 12 characters for double-width languages like Chinese, Japanese, and Korean. An account needs at least two eligible callouts before any display next to an ad, and Google typically shows between two and six at a time.

Where This Number Comes From

Google's Ads API documentation defines the callout text field with a strict 1-to-25-character constraint. This is the authoritative source for the limit — not a style guideline, but a hard field constraint enforced at the API level, so a callout written past 25 characters simply won't save.

The CJK Exception

Several ad agency guides covering callout specs note that the limit shrinks to 12 characters for double-width languages — Chinese, Japanese, and Korean — since each character in those languages occupies roughly double the visual width of a Latin character. Google's interface applies this adjustment automatically based on the account's language settings, so advertisers running campaigns in those languages need to write noticeably shorter callout text to stay compliant.

How Many Callouts Actually Display

The 25-character cap governs each individual callout, but it doesn't guarantee how many show at once. Google Ads needs a minimum of two eligible callouts to display any, and from there it rotates in combinations of two to six based on predicted performance and available ad space — meaning an advertiser who writes ten callouts should expect Google to pick a rotating subset, not all ten at once.

Why Shorter Is Still Better Than Maxing Out

Writing to the full 25-character limit isn't the optimal strategy. Agencies that specialize in ad extensions commonly recommend keeping each callout under roughly 15 characters, since shorter callouts leave more room for Google to display a greater number of them together in the ad's available extension space. A callout written at 24 characters may crowd out a second or third callout that would otherwise have shown alongside it.

What This Means for Writing Callouts

• Treat 25 characters as a hard ceiling, not a target. The field rejects anything longer — there's no soft overflow or truncation to plan around.
• Write CJK-language callouts to a 12-character budget. Translating a 25-character English callout directly into Japanese or Korean will often overflow this shorter limit.
• Submit at least four to six callouts per ad group. Since only two are required to display but up to six can rotate in, having more eligible callouts gives Google more combinations to test for performance.

Bottom Line

Write every callout to fit inside 25 characters (12 for CJK languages), but aim for roughly 15 characters in practice so more of your callouts can display together rather than crowding each other out. Before publishing a new batch of callouts, check them against Google's live character counter in Ads Manager rather than counting manually, since whitespace and punctuation both count toward the 25-character field limit and are easy to miscount by hand.

Source: Google Ads API Reference, CalloutFeedItem/callout asset field documentation (developers.google.com/google-ads/api).