Converters
Convert cleanly between common formats — Markdown, HTML, JSON, YAML — with no sign-up and nothing ever uploaded.
Tools
Images to PDF
Combine JPEG and PNG images into one PDF, one image per page, in the order you choose.
Markdown → HTML
Paste Markdown to see it rendered live and get the HTML source to copy — CommonMark + GFM tables/strikethrough, raw HTML always shown as text, never executed.
HTML → Markdown
Paste HTML to get clean Markdown instantly — headings, links, lists, code, blockquotes, GFM tables and strikethrough. Script and style content is always dropped.
JSON ⇄ YAML
Convert between JSON and YAML instantly, in either direction — type in either box and the other updates. Reuses the JSON Formatter validator for accurate line/column error messages.
Length Converter
Convert between length units instantly — millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles.
Weight Converter
Convert between weight and mass units instantly — milligrams, grams, kilograms, tonnes, ounces, pounds, stone, and US tons.
Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin instantly.
CSV ⇄ JSON
Convert between CSV and JSON instantly, in either direction — with proper handling of quoted fields, commas, and escaped quotes.
Color Converter
Convert between HEX, RGB, and HSL color formats instantly, in any direction.
Unix Timestamp Converter
Convert between a Unix timestamp and a date/time, in either direction — with clearly labeled UTC and local time.
Color Palette Generator
Generate complementary, analogous, triadic, tetradic, and monochromatic color palettes from any base color (hex, RGB, or HSL).
Time Zone Converter
Convert a date and time between time zones, with daylight-saving-time handled correctly using your browser's own time zone data.
Why these tools run entirely in your browser
Content you're converting is often unpublished — draft documentation, a config file, notes you haven't shared. Every conversion here runs locally in JavaScript; nothing is uploaded, logged, or stored.