All tools

Format, validate & minify JSON with instant error detection.

Encode and decode Base64 for text and files, both directions.

Decode a token's header, payload & signature — locally, never sent.

Generate v1, v4 & v7 UUIDs, in bulk if you need.

Convert between Unix timestamps and human-readable dates.

Live regular-expression matching with a built-in cheatsheet.

Look up A, AAAA, MX, TXT, NS & CNAME records for any domain.

Inspect a site’s TLS certificate: issuer, expiry, SANs & chain.

Convert between JSON, YAML, TOML, XML & CSV in your browser.

Write and run Go in a secure sandbox — compile & execute online.

Run Python entirely in your browser (Pyodide/WASM) — no server.

Run SQLite queries in your browser (sql.js/WASM) — no server.

Format, validate & minify JSON with instant error detection.

Encode and decode Base64 for text and files, both directions.

Percent-encode or decode URLs and query components.

Decode a token's header, payload & signature — locally, never sent.

MD5, SHA-1, SHA-256, SHA-512 hashes of text, in your browser.

Generate v1, v4 & v7 UUIDs, in bulk if you need.

Strong random passwords with length & character controls.

Test any password locally: entropy, crack-time estimate & tips.

Turn text, URLs or contact info into a downloadable QR code.

Generate secure random tokens & API keys with your crypto RNG.

Convert between Unix timestamps and human-readable dates.

Convert colors between HEX, RGB, HSL and preview them.

Convert between JSON, YAML, TOML, XML & CSV in your browser.

Live regular-expression matching with a built-in cheatsheet.

Compare two blocks of text and highlight the differences.

Count words, characters, sentences & reading time.

Write Markdown and see the rendered HTML live, side by side.

Calculate loan EMIs with total interest and amortization.

Add or remove GST at any rate, with inclusive/exclusive split.

Look up A, AAAA, MX, TXT, NS & CNAME records for any domain.

Classify an IP, reverse-DNS it, and locate it geographically.

Fetch any URL and inspect its status and response headers.

Inspect a site’s TLS certificate: issuer, expiry, SANs & chain.

Look up registration details for any domain via WHOIS.

Toggle Unix permissions and get the octal & symbolic chmod values.

Test whether an origin is allowed by a URL’s CORS policy.

Write and run Go in a secure sandbox — compile & execute online.

Compile and run C in a secure online sandbox (gcc).

Compile and run C++ in a secure online sandbox (g++).

Compile and run Java in a secure online sandbox (OpenJDK).

Compile and run Rust in a secure online sandbox (rustc).

Run Python entirely in your browser (Pyodide/WASM) — no server.

Run SQLite queries in your browser (sql.js/WASM) — no server.