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KelvidoConverters

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.

Converter Local processing

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.

Converter Local processing

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.

Converter Local processing

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.

Converter Local processing

Length Converter

Convert between length units instantly — millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles.

Converter Local processing

Weight Converter

Convert between weight and mass units instantly — milligrams, grams, kilograms, tonnes, ounces, pounds, stone, and US tons.

Converter Local processing

Temperature Converter

Convert between Celsius, Fahrenheit, and Kelvin instantly.

Converter Local processing

CSV ⇄ JSON

Convert between CSV and JSON instantly, in either direction — with proper handling of quoted fields, commas, and escaped quotes.

Converter Local processing

Color Converter

Convert between HEX, RGB, and HSL color formats instantly, in any direction.

Color Local processing

Unix Timestamp Converter

Convert between a Unix timestamp and a date/time, in either direction — with clearly labeled UTC and local time.

Converter Local processing

Color Palette Generator

Generate complementary, analogous, triadic, tetradic, and monochromatic color palettes from any base color (hex, RGB, or HSL).

Color Local processing

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.

Converter Local processing

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Content you're converting is often unpublished — draft documentation, a config file, notes you haven't shared.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.