Converters

Converters — 8 free browser-based developer tools including Timestamp Converter, YAML to TOML Converter and Markdown to HTML. Everything runs locally with no signup or uploads, so your data stays private and results are instant.

8 tools

Timestamp ConverterFree online tool to convert between Unix timestamps and dates in both directions. It accepts seconds (10 digits) and milliseconds (13 digits), and supports timezones like KST, JST, UTC plus ISO 8601 and relative time.

YAML to TOML ConverterFree online tool to convert between YAML and TOML config files in both directions. It auto-detects the input format and transforms YAML to TOML or TOML to YAML in your browser, so no data is sent to a server.

Markdown to HTMLMarkdown to HTML converter that works in both directions, turning headings, lists, links and code blocks into clean HTML or back to Markdown. Free and instant in your browser.

CSV to Table ConverterFree online CSV converter that turns comma-separated data into clean HTML or Markdown tables. Paste or upload your CSV, choose the delimiter and headers, then copy the result.

Color ConverterColor converter between HEX, RGB, HSL and OKLCH codes, with the WCAG contrast ratio for any two colors. Check accessibility compliance while you pick palettes, free in your browser.

SVG to Base64Free online tool to convert between SVG code and Base64 data URIs in both directions. It auto-detects the input, encodes SVG to Base64 or decodes it back, and outputs inline URIs for CSS.

Number to WordsNumber to words converter that writes a value like 1234 as one thousand two hundred thirty-four, in English or Korean. Handy for cheques, invoices and written amounts, free in your browser.

PX to REM ConverterPX to REM converter that translates CSS pixel and rem units in both directions using a customizable root font size, decimals included. Comes with a copyable reference table and CSS snippet output, free in your browser.

How to Use

1
Pick the pair you are converting— Colour between HEX, RGB and HSL, CSV into a table, Markdown into HTML, YAML into TOML, px into rem, an SVG into a data URI, or a Unix timestamp into a readable date.
2
Paste the input and let it detect the direction— The converters read what you paste and switch sides on their own, converting as you type instead of behind a submit button.
3
Copy the result, then convert back to check— Every converter works in both directions, so running the output back through it is the quickest way to confirm nothing was lost.

Frequently Asked Questions

16px by default, because that is the browser's default size for the html element. If your project resets the root size — the common 62.5% trick makes it 10px — change the root value in the tool so the reference table and the generated CSS snippet match your stylesheet.

A 10-digit number is seconds and a 13-digit number is milliseconds; the Timestamp Converter detects the length and shows both readings. It also renders the result in UTC and in zones such as KST and JST, plus ISO 8601 and relative time, so you can confirm which one your API meant.

Inline only small graphics that rarely change: Base64 adds roughly 33% to the byte count and a data URI cannot be cached separately from the stylesheet. Anything reused across pages is better off as a real file, and the SVG to Base64 converter works both ways so the decision is reversible.