Check your copy against every format's length limit at once

Paste your copy into the box and the counter reads it against every format at once: word count, character count, and whether it fits within the recommended and maximum lengths for each channel you write for. There is no separate mode for ads or subject lines. One paste, one table, every limit checked in the same pass.

Reading the comparison table

The table lists each format down the side, so you can see at a glance where your copy sits. A Google Ads headline has a hard limit of 30 characters; a Meta Ads primary text has room to run much longer before it truncates in the feed; an email subject line starts getting cut off on mobile screens well before it does on desktop. Paste the copy once and let the table show you which formats it already fits and which it does not.

Trim or extend, then check again

Where your copy runs over, the table tells you by how much. That is more useful than a single pass or fail, because two characters over a limit is a different editing job from twenty. Cut from the end first, since that is usually where a sentence has trailed off rather than made its point, then paste the revised version back in and check it again.

Where your copy has room to spare, the same principle runs in reverse. A Meta Ads description with forty characters unused is not automatically better for staying short: if there is a genuine reason to read a benefit rather than infer it, use the space. Use the counter to see what room you have.

Why the limits differ by format

Each limit comes from how the platform displays the text. Google truncates a headline at a fixed character count because that is what fits the ad unit; an SMS message splits into a second message, and a second charge, past 160 characters; LinkedIn shows a shortened preview of a post before a "see more" link appears. Knowing the reason behind a limit makes it easier to decide when it is worth writing right up to the edge of it and when a shorter version reads better regardless of what the format allows.

Where to go from here

The full copy length reference tables set out the recommended and maximum lengths for every format in one place, with sources, if you want the figures without pasting anything in. If the copy fits the limit but still reads awkwardly once trimmed, the readability and clarity checker looks at sentence length and reading ease. The counter can be wrong about how a platform will actually render your text, since platforms update their display rules; treat its verdict as a working check, not a guarantee, and preview the copy on the platform itself before it goes live.