Eight free, browser-based data converters — CSV, YAML, query strings, JSON5, Markdown, URL encoding, Base64, and Unix timestamps, all converting to and from JSON or their natural counterpart. Nothing you paste or upload is ever sent to a server; every conversion runs locally in your browser.

Choose a converter

CSV ⇄ JSON

Turn spreadsheet exports and CSV data into structured JSON, and back. Handles quoted fields and type detection.

YAML ⇄ JSON

Convert config-file YAML to JSON and back, with full support for anchors, aliases, and comments.

Query String ⇄ JSON

Turn a URL query string into readable JSON, or build one from JSON data — bracket notation supported.

JSON5 ⇄ JSON

Strip comments and trailing commas from JSON5 config files, or reformat JSON the human-friendly way.

Markdown ⇄ HTML

Convert Markdown to HTML with a live preview, or turn existing HTML back into clean Markdown.

URL Encode ⇄ Decode

Percent-encode or decode text for safe use in URLs — Component and Full URL modes included.

Base64 ⇄ Text

Encode text or files to Base64, or decode a Base64 string back to readable text or binary.

Timestamp ⇄ Date

Convert a Unix timestamp to a readable date, or a date back to a timestamp. Supports seconds and milliseconds.