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Tools for Chrome Extension Developers

Build better extensions, faster.

12 free toolsNo signup required

Featured Tools

Developer

Manifest V3 Generator

Generate a valid Chrome Extension manifest.json (Manifest V3) from a form. No need to memorize syntax — fill in the fields and get a ready-to-use JSON file.

InstantNo Upload
Developer

Chrome Extension Boilerplate Generator

Select your options (popup, background SW, content script, TypeScript) and get a complete Chrome Extension boilerplate with all files pre-configured. Ready to load in Chrome Developer Mode.

InstantNo Upload
Developer

Chrome Extension Icon Generator

Upload one image and get all 4 required Chrome extension icon sizes (16×16, 32×32, 48×48, 128×128) instantly. Download as individual PNGs, ready for your extension.

Instant

🔧 Core Extension Files

3 tools
Developer

Manifest V3 Generator

Generate a valid Chrome Extension manifest.json (Manifest V3) from a form. No need to memorize syntax — fill in the fields and get a ready-to-use JSON file.

InstantNo Upload
Developer

Chrome Extension Boilerplate Generator

Select your options (popup, background SW, content script, TypeScript) and get a complete Chrome Extension boilerplate with all files pre-configured. Ready to load in Chrome Developer Mode.

InstantNo Upload
Developer

Chrome Extension Icon Generator

Upload one image and get all 4 required Chrome extension icon sizes (16×16, 32×32, 48×48, 128×128) instantly. Download as individual PNGs, ready for your extension.

Instant

🔒 Security & Storage

3 tools
Developer

Content Security Policy (CSP) Generator

Build a Content Security Policy header string using checkboxes. No need to memorize complex CSP syntax — configure sources for scripts, styles, images, and more.

InstantNo Upload
Developer

Chrome Storage Size Calculator

Paste your JSON data and instantly see its byte size compared to Chrome extension storage limits. Supports chrome.storage.sync (100KB) and chrome.storage.local (5MB).

InstantNo Upload
Developer

Chrome Permissions Explainer

Paste your Chrome Extension permissions array and get plain-English explanations with risk levels for each permission. Perfect for writing your privacy policy and store listing.

InstantNo Upload

📣 Chrome Web Store

1 tool
Developer

Chrome Web Store Description Generator

Generate an optimized Chrome Web Store listing — short description (132 chars) and full description with features, how-to, and privacy section. Copy and paste into Chrome Web Store Developer Dashboard.

InstantNo Upload

🛠️ Developer Tools (Existing)

5 tools
Developer

JSON Formatter & Validator

Format, beautify, minify, and validate JSON data. Syntax highlighting with error detection and tree view.

InstantNo Upload
Developer

Base64 Encoder & Decoder

Encode text to Base64 or decode Base64 to text instantly. Supports UTF-8 encoding and file-to-Base64 conversion.

InstantNo Upload
Developer

URL Encoder & Decoder

Encode or decode URLs and query parameters. Convert special characters to percent-encoding for safe URL usage.

InstantNo Upload
Developer

Regex Tester

Test and debug regular expressions in real-time. See matches highlighted, capture groups, and get explanations for your patterns.

InstantNo Upload
Text

Case Converter

Convert text between UPPERCASE, lowercase, Title Case, camelCase, snake_case, CONSTANT_CASE, and more with one click.

InstantNo Upload

Everything Chrome Extension Developers Need

From generating a valid manifest.json to resizing icons and explaining permissions — these tools cut hours of setup work down to minutes. Build extensions faster, with fewer mistakes.

Frequently Asked Questions

What is Manifest V3?
Manifest V3 is the current Chrome extension platform, replacing MV2. It uses service workers instead of background pages, has stricter Content Security Policy rules, and better privacy controls. All new Chrome extensions must use MV3.
What icon sizes does Chrome require?
Chrome requires 4 icon sizes: 16×16 (browser toolbar), 32×32 (Windows hi-DPI), 48×48 (extensions management page), and 128×128 (Chrome Web Store listing). Our icon generator creates all four from a single image upload.
Is the boilerplate code production-ready?
The boilerplate provides a valid, working file structure with correct manifest.json and starter files. You'll need to add your own business logic, but it loads in Chrome's Developer Mode without errors out of the box.
Does the storage calculator account for chrome.storage.session?
Currently the calculator covers sync (102,400 bytes total, 8,192 bytes per item) and local (5MB). Session storage support is coming in a future update.
Can I use these tools offline?
Yes. All tools run entirely in your browser with no server requests needed. Icon resizing, manifest generation, and boilerplate creation all work without an internet connection after the page loads.

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