Free Developer Tools
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Fast, free & ad-light
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Everything runs in your browser
A growing collection of free, no-signup tools for developers — built to be genuinely useful and to respect your privacy. Nothing you paste is uploaded or stored; every tool runs entirely in your browser.
Format, minify & validate JSON. Explains errors in plain English, points to the exact spot, and suggests fixes.
Open tool →Convert Spring Boot application.properties to application.yml and back. Handles lists, profiles & comments — and repairs broken files with one click.
Open tool →Build the config that connects Claude Desktop, Claude Code, VS Code or Spring AI to MCP servers — each in the shape it actually accepts. Paste a broken one and find out why it fails.
Open tool →Convert between Unix epoch timestamps and human-readable dates, in any timezone.
Open tool →Encode text to Base64 or decode Base64 back to text, instantly in your browser.
Open tool →