Formatters, generators and decoders for everyday engineering work.
20 tools, all free and browser-based.
Pretty-print and validate JSON with useful error messages.
Pick a colour and get HEX, RGB, HSL, OKLCH and contrast ratios.
Build a cron schedule, see when it runs, and get the config for it.
Build a theme palette and export it as CSS, Tailwind, SCSS or JSON.
Spot hallucinated and typosquatted package names before you install them.
Read epoch timestamps as dates, and dates as timestamps.
Read an SSL certificate — who it is for, when it expires, and what it covers.
Wire up gates, flip the switches, and watch a circuit remember.
Generate cryptographically random UUIDs in bulk.
Read the header and claims inside a JSON Web Token.
Convert between binary, octal, decimal and hexadecimal.
Convert between HEX, RGB, HSL, HSV and CMYK.
Build a SELECT with joins and get JDBC or Python code for it.
Strip whitespace to make JSON as small as possible.
Test a pattern against real text and see every match.
Make long queries readable with consistent keyword layout.
Indent XML properly, or collapse it onto one line.
Compute SHA-1, SHA-256, SHA-384 and SHA-512 digests.
Clean up delimiters, quoting and ragged rows.
Generate placeholder text by word, sentence or paragraph.