Developer tools that respect your data
Format, convert and encode — all in your browser. Free, private, no sign-up.
All tools
JSON Formatter & Validator
Format, validate & minify JSON — right in your browser.
Base64 Encode / Decode
Encode text to Base64 and decode it back — URL-safe option, UTF-8 ready.
Unix Timestamp Converter
Convert Unix timestamps to human dates and back — seconds, milliseconds, UTC & local.
UUID Generator
Generate random UUID v4 and time-ordered v7 — in bulk, instantly.
Diff Checker
Compare two texts line by line and see exactly what was added, removed or kept.
JSON to CSV Converter
Convert a JSON array into clean CSV — open it in Excel, Sheets or Numbers.
URL Encode / Decode
Percent-encode text for URLs and decode it back — component or full-URL mode.
JWT Decoder
Decode a JSON Web Token to read its header, payload and signature — 100% in your browser.
Hash Generator
Generate MD5, SHA-1, SHA-256 and SHA-512 hashes from any text — instantly and locally.
Cron Expression Parser
Parse a cron expression, see each field explained, and preview the next 5 run times.
Why ToolPie
Private by default
Everything runs locally in your browser. Your data is never uploaded.
Instant & lightweight
Static, CDN-served pages that load fast and work on any device.
AI & API ready
Tools are exposed as an API and MCP server so agents can call them too.