Chrome Extension Developer Tools
Every tool runs in your browser — no signup, no upload, no tracking. Built for Chrome extension developers who want to ship faster.
Store Submission
Submission Readiness Checker
Upload your manifest or .zip and validate ALL Chrome Web Store requirements in one pass before submitting.
Listing Audit / Score
Get an optimization score for your store listing with actionable suggestions to improve visibility.
Rejection Code Decoder
Decode cryptic Chrome Web Store rejection codes (Blue Argon, Purple Potassium, etc.) into specific fixes.
Data Disclosure Form Helper
Walk through the CWS privacy data disclosure form interactively with guidance and warnings.
Extension .zip Packager
Package your extension files into a correctly structured .zip. Auto-fixes the folder-zipping mistake.
Listing & SEO
Description Generator
Generate optimized Chrome Web Store listing copy — title, short description, and long description.
Listing Preview
Preview how your extension will look on the Chrome Web Store before publishing.
Permission Warning Preview
Paste your manifest.json and see exactly what install warning dialog users will see.
Assets & Images
Icon Resizer
Upload one icon, instantly get all 4 Chrome extension sizes (16, 32, 48, 128px).
Image Validator
Validate your screenshots, icons, and promotional images meet Chrome Web Store requirements.
Screenshot Resizer
Resize screenshots to exact Chrome Web Store dimensions (1280x800 or 640x400).
Screenshot Beautifier
Add gradient backgrounds, browser frames, text overlays, and shadows. Export at exact CWS dimensions.
Multi-Store Asset Exporter
Upload one image, batch-generate all icon sizes for Chrome, Firefox, Edge, Opera, and Safari stores.
Promotional Tile Generator
Create small promo tiles (440x280) and marquee banners (1400x560) with gradient backgrounds and text.
Development
Manifest.json Generator
Generate a valid manifest.json for Chrome extensions with guided form fields.
Privacy Policy Generator
Generate a privacy policy tailored for Chrome extensions — required if you collect any user data.
Localization / i18n Generator
Generate _locales/messages.json files for multiple languages. Localized extensions get up to 50% more installs.
MV2 to MV3 Converter
Paste a Manifest V2 manifest.json and get a V3 version with auto-conversions and migration notes.
Need the full screenshot editor?
CWS Kit also includes a drag-and-drop screenshot designer with browser frames, gradient backgrounds, text overlays, and one-click export at exact CWS dimensions.
Open Screenshot Editor