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LinkedIn ad mockup tool separates recommended and hard character limits

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Maestro built a free LinkedIn ad mockup tool that treats each field as having two limits: a recommended length and a published maximum. Copy that exceeds the recommendation triggers a warning, while copy over the hard maximum blocks review export until fixed. The tool's character count is a local approximation, not LinkedIn's exact Unicode logic, so users are advised to test boundary copy in Campaign Manager. Mobile-only 4:5 images are shown as unsupported in the desktop view rather than being squeezed into an inaccurate placement. The tool runs in the browser with no sign-in, so uploaded creative is not stored on a server, and it is not an official LinkedIn preview.

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