Free tools that just work

No sign-up, no upload, no catch. Everything runs in your browser. A library we grow every week.

Web

Formatters, validators and converters for everyday development

All Web

JSON Formatter

Paste messy JSON, get it back clean and readable, with the exact line and column of any error. Nothing leaves your browser.

SEO

Generators and checkers for search and structured data

All SEO

Meta Tag Generator

Generate title, description, Open Graph and Twitter tags with a live preview of your Google result and social card. Nothing leaves your browser.

Schema Markup Generator

Build valid structured data for organizations, local businesses, FAQs, articles and breadcrumbs from a form. Copy the script tag and paste. Nothing leaves your browser.

Robots.txt Generator

Generate a correct robots.txt from a few safe choices, with plain-language explanations of what each rule does. Defaults to allowing everything. Nothing leaves your browser.