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Browser Extension Asset Generator

Create a cross-browser extension asset package from one square PNG or SVG. The ZIP includes manifest-ready PNG icons, a Manifest V3 icon snippet, Chrome Web Store artwork, and Microsoft Edge Add-ons promotional tiles, with all processing performed locally in your browser.

Features

Manifest icon sizes from 16 to 128 pixelsFirefox high-resolution iconChrome Web Store assetsMicrosoft Edge Add-ons assetsManifest V3 icon snippetCustom promotional background color

How to use the Browser Extension Asset Generator

  1. 1Choose a square PNG or SVG source image. A 512 by 512 PNG is recommended for raster artwork.
  2. 2Upload the image or drag it into the generator. Source files up to 10 MB are supported.
  3. 3Choose the background color used behind your icon on the promotional store tiles.
  4. 4Generate and download the browser extension asset package.
  5. 5Copy the extension icons into your project and merge the provided properties into manifest.json.
  6. 6Review and customize the promotional tiles before uploading them to each browser store.

Common uses

  • Prepare icons for a new Manifest V3 browser extension.
  • Use one consistent icon set across Chrome, Brave, Edge, and Firefox.
  • Replace placeholder artwork before packaging an extension release.
  • Create correctly sized starter artwork for Chrome Web Store and Microsoft Edge Add-ons listings.

Manifest-ready extension icons

The extension folder contains PNG icons at 16, 32, 48, 96, and 128 pixels. Chrome uses the smaller sizes across extension pages, Windows, and the extensions manager, while Firefox can select the 96-pixel file on high-resolution displays.

The manifest-icons.json file contains icons and action.default_icon properties that can be merged into a Manifest V3 manifest. Chrome manifest icons must use supported raster formats, so SVG input is converted to PNG output.

Browser-store promotional artwork

The Chrome Web Store folder includes a 128 by 128 icon, a 440 by 280 small promotional tile, and a 1400 by 560 marquee tile. The Edge folder includes a 300 by 300 listing logo plus matching small and large promotional dimensions.

Promotional files center your icon on the selected background color. Treat them as clean starter assets and review them against the current store listing before submission.

Private browser processing

Your source image is decoded, resized, and packaged locally in the browser. It is not uploaded to the WebUtils server, which keeps unreleased extension artwork private.

Frequently asked questions

Which browsers can use these extension icons?

The PNG sizes and Manifest V3 snippet work with Chromium-based browsers such as Chrome, Edge, and Brave, while the package also includes a 96-pixel high-resolution icon useful for Firefox.

Can Chrome extension manifests use SVG icons?

No. Chrome does not support SVG files for icons declared in the extension manifest. You can upload an SVG source here, but the generated extension icons are PNG files.

Are the promotional tiles ready to submit?

They use the correct dimensions and provide a clean icon-centered starting point. Review them before submission and add product-specific messaging or imagery when your listing needs more context.

Is my extension artwork uploaded to a server?

No. Resizing, promotional rendering, and ZIP generation happen locally in your browser.

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Browser Extension Asset Generator | WebUtils.io