Free browser tools

See it before you publish

Build realistic social post previews in your browser. No account, no upload to Postid servers, no guesswork.

01

Prepare

Enter copy, profile details and optional media.

02

Check

Inspect the post in its platform feed layout.

03

Export

Download a PNG for review or presentation.

Plan and validate

Finish a task without signing up

Copy validation

Caption Compatibility Checker

Compare one caption against the publishing limits of selected platforms.

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Image preparation

Social Media Image Resizer

Crop or fit an image in your browser and download exact dimensions.

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Transparent analytics

Engagement Rate Calculator

Calculate a transparent rate by followers, reach or impressions.

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Preview generators

Inspect the feed appearance

Instagram Preview

Check post copy and media in a realistic feed layout.

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Facebook Preview

See the copy and media layout before publishing to Facebook.

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Threads Preview

Review Threads copy and media together before publishing.

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X Post Preview

Inspect how an X post will look in the feed.

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Bluesky Preview

Preview a Bluesky post with emoji-aware length counting.

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