Tested tool guide
Tested browser tools
Checked August 16, 2026
What Google Business Post Previewer does, with a checked example
A published Google Business Profile post cannot be edited: the only fix is deleting it and posting again. This tool renders the post as the local feed will show it, so the mistake never ships. You pick the format (update, offer, or event), paste the description, attach an image, and choose a CTA; the previewer draws the card, counts characters against the 1,500-character description cap, checks the image against the recommended 4:3 ratio, and marks where the feed will insert its 'See more' cut. The usual surprise: only about the first 100 characters show without a click, so the price, date, or hook belongs at the top of the text.
Worked example
A concrete input and expected output from the current implementation.
Input
Update post. Description: "Grand opening this Saturday. Visit us at 121 Main Street and enjoy 20% off your first order. Doors open at 10 AM." Image: 1200 x 900. CTA: Learn More, pointing to https://example.com/grand-opening
->
Expected output
A card preview with a check panel alongside: the image renders at 4:3, the description shows with a 'See more' link inserted after roughly 100 characters, and a blue 'Learn More' button carries the given URL. Checks: 113 of 1,500 characters used - within limit; 1200 x 900 is 4:3 - passes; 'Learn More' is a supported CTA - passes.
The description counts out to exactly 113 characters, every character including spaces and punctuation, far below the 1,500-character cap; 1200 divided by 900 is exactly 4:3, the ratio the tool recommends for post images. The truncation mark is approximate because Google's exact cut point varies by renderer.