Free online dev tools
Small utilities we built for our own workflow and figured were worth sharing. They’re free, need no account, and run entirely in your browser — nothing you paste is sent anywhere or stored.
Validate, format or minify JSON, then browse it as a tree with a Name/Value grid.
- Validate JSON with the exact line and column of any error
- Format (pretty-print) or minify JSON
- Collapsible tree view with a Name/Value property grid
A plain-text notepad with find & replace (regex too), word count, and nothing saved.
- Find & replace with match case, whole word and regex
- Highlights every match as you type
- Line, word and character count
Turn a rough idea into a clear, structured prompt for any AI assistant.
- Presets for blog posts, emails, code review, summaries and social captions
- Role, context, format, tone and constraint fields
- Works with ChatGPT, Claude, Gemini and any other assistant
Why these run in your browser
Pasting an API response, a config file or a customer list into a random website is a quiet data-protection risk. Every tool here does its work locally with JavaScript, so there’s no server that ever sees your data — and the notepad doesn’t even keep your text between visits. That matters more for Indian businesses now that the DPDP rules put obligations on how personal data is handled.
Looking for AI products rather than utilities? Browse the AI tools directory or see the free AI tools.