I built 27 free browser-based developer tools — no accounts, no tracking, no ads

I got tired of using ad-riddled developer tools that send my data to external servers. So I built my own — 27 of them — and made them all free. Every tool runs 100% client-side in your browser. No data leaves your machine. No accounts. No cookies. No tracking pixels. The Tools Code & Data Tool What it does JSON Formatter Format, validate, minify JSON with syntax highlighting Regex Tester Live match highlighting with capture groups JWT Decoder Decode tokens, check expiry, view claims Base64 Encoder Encode/decode with UTF-8 support Diff Checker Side-by-side text comparison YAML Validator Validate syntax + convert to JSON HTML Entity Encoder Encode/decode HTML entities SQL Formatter Format, beautify, minify SQL queries DevOps & Infrastructure Tool What it does Docker Run to Compose Convert CLI commands to docker-compose.yml ComfyUI Workflow Validator Validate node connections, find broken references LLM VRAM Calculator Check if your GPU can run Llama/Qwen/Mixtral Cron Expression Generator