Free, fast, no-signup developer tools + guides.
JSON, Base64, Regex, UUID, URL encoding — all in one place.
No ads. No tracking. Everything runs client-side in your browser.
Format, validate & minify JSON instantly
Open Tool →Encode & decode Base64 strings and files
Open Tool →Test regex patterns with real-time matching
Open Tool →Encode & decode URLs and query strings
Open Tool →Generate v4 UUIDs instantly
Open Tool →MD5, SHA-1, SHA-256 hash generation
Open Tool →Compare text and find differences
Open Tool →Decode and inspect JSON Web Tokens
Open Tool →Build & test cron expressions visually
Open Tool →Convert Unix timestamps to dates and back
Open Tool →No fluff. Just tools that respect your time.
Just open and use. No accounts, no paywalls, no friction.
Everything runs in your browser. Your data never leaves your machine.
No loading spinners, no ads, no popups. Just paste and go.
Fully responsive. Developer tools in your pocket, anywhere.
In-depth articles to level up your workflow.
Service Workers for offline-capable tools — practical guide for developers with code examples and best practices.
Learn how to automate common dev chores with practical scripts, real code examples, and tool links you can use today to save hours each week.
Learn how to use structured output in 2026 LLMs with JSON Schema, tool calling, and validation. Includes practical code examples.
A practical 2026 guide to LLM API integration patterns: routing, caching, tool calling, retries, observability, and safety with real code examples.
A practical OAuth 2.0 implementation guide for web apps: flows, PKCE, security pitfalls, token storage, and production-ready code examples for 2026.
A practical 2026 guide to picking the right database for side projects—SQLite, Postgres, MySQL, MongoDB, Redis, and managed services with code examples.
DevToolKit started because we were tired of ad-riddled, slow, bloated tool sites. Every tool here is free, fast, and private — built with the same standards we'd want for ourselves.
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