Nothing is uploaded. Just open it and start.
Fill a mockup with placeholder text, or seed a database and tests with realistic fake records — names, emails, addresses, and more — exported as JSON or CSV. Reproducible with a seed, free, and fully client-side. No sign-up, nothing uploaded.
Placeholder paragraphs, sentences, or words — with the classic opening if you want it.
Names, emails, addresses, companies, and more — pick exactly the fields you need.
Export reproducible fixtures with a seed, as an array of objects or a CSV table.
Everything is generated in your browser. No server round trip, ever.
Write Mermaid diagrams, preview live, export PNG/SVG, and share with a link.
Format, validate, and minify JSON with live error checking and one-click download.
Compare two code snippets or files with a clear, color-coded diff, side-by-side or unified.
Encode and decode text with Base64 or URL encoding instantly, entirely in your browser.