Free tools
Free tools for Chrome extension developers.
Small, fast, no-signup utilities for the everyday work of shipping a Chrome extension — from the manifest to the Web Store listing to the moment a user uninstalls.
Manifest V3 Generator
Build a valid manifest.json from a visual form, with inline warnings for trust-heavy permissions.
Works with UserFeedWeb Store Asset Resizer
Turn one image into every Chrome Web Store size — icons, promo tiles, and screenshots.
Icon Generator
Turn one image into every Chrome extension icon size (16–128) plus the 440×280 promo tile.
Feedback boards
Let users post and vote on what to build next — a public roadmap your extension's users can follow. Part of Pro at $4/mo per extension.
See feedback boardsTile Cropper
Crop any image to the exact 440×280 Chrome Web Store promo tile.
Marquee Generator
Crop any image to the exact 1400×560 Chrome Web Store marquee tile.
Screenshot Beautifier
Turn a raw screenshot into a polished 1280×800 store image with frame, shadow, and caption.
Store Asset Checker
Validate your listing icons, screenshots, and tiles against each store's exact required sizes.
Uninstall feedback forms
Find out why users leave with a hosted uninstall survey built for Chrome extensions — every uninstall becomes a fix, not a mystery.
See how it worksManifest Validator
Catch errors, deprecated keys, and the exact permission warnings your users will see.
Works with UserFeedMV2 → MV3 Checker
Paste a Manifest V2 file and see exactly what to change for Manifest V3.
Works with UserFeedExtension Inspector
Inspect any published extension's manifest, permissions, and size by ID or Web Store URL.
Works with UserFeedUserscript @match Tester
Test Tampermonkey @match patterns against real URLs and see exactly what each one matches.
Related: ScriptPandaUserscript Header Generator
Build a correct ==UserScript== header for Tampermonkey and Greasemonkey, with your @match lines checked.
Related: ScriptPandaCSS Selector Tester
Test a CSS selector against pasted HTML, with matches highlighted in a safe preview.
Related: ScriptPandaGuides
Guides for shipping and growing your extension.
Chrome Web Store Optimization: The Complete Guide
How to optimize your Chrome Web Store listing to rank higher and convert more installs — name, description, keywords, screenshots, and quality signals.
Chrome Extension Analytics: What Weekly Users Really Counts
How the Chrome Web Store counts weekly users, what its dashboard hides, and the metrics to track instead: activation, retention and uninstall reasons.
chrome.runtime.setUninstallURL: Uninstall Feedback
A step-by-step guide to chrome.runtime.setUninstallURL — the Chrome API that opens a page when users uninstall, so you can finally ask why and reduce churn.
The Chrome Extension Developer Stack
The tools every Chrome extension developer actually needs — for building, debugging, the Web Store listing, analytics, and retention — with honest picks.