Dev Toolbox is a browser extension that provides quick offline access to various development tools.

Current tool set:

1. Calculate hashes
2. Encode and decode HTML, URI, Base64
3. Convert number between different bases
4. Parse and manipulate various time formats
5. Format and inspect IPv4/CIDR addresses
6. Search all v13.1 emoji with quick copying

Runs entirely offline, and only requires local storage permission to remember the last tool used and its input.

Available on the Chrome Web Store.

Chrome extensions can be installed as-is from the Chrome Web Store.

Available from Firefox Add-ons.

Differences in Firefox:

• Emoji "Copy as PNG" button not available due to lack of support (by default) for ClipboardItem.