Browser StudioBrowser Studio

Free tool

Chrome Web Store asset checker

Upload your listing images and check each one against the exact icon, screenshot, and promo-tile sizes the Chrome, Edge, and Firefox stores require — before a rejected review round-trip.

Nothing is uploaded — checked in your browser.

Required for Chrome Web Store
Store icon 128×128—
Screenshot 1280×800—
Screenshot 640×400—
Small promo tile 440×280—
Marquee 1400×560—

How it works

Validate before you submit.

  1. 01

    Pick a store

    Chrome, Edge, or Firefox — each has its own required sizes.

  2. 02

    Upload assets

    Drop in your icons, screenshots, and tiles all at once.

  3. 03

    Fix the flags

    Each asset shows valid or exactly what's wrong (size or format).

FAQ

Store assets, explained.

A 128×128 store icon, screenshots at 1280×800 or 640×400, a 440×280 small promo tile, and (optionally) a 1400×560 marquee. This tool checks each uploaded image against those exact sizes.

No — dimensions and formats are read in your browser. Nothing is uploaded.

The stores reject or silently downscale assets that aren't the exact required size, which makes your listing look off. Checking before you submit saves a rejected review round-trip.

Yes — switch the store selector to see the required asset sizes for Edge Add-ons and Firefox Add-ons, which differ from Chrome.