Base64 Encoder / Decoder

Encode and decode URLs and query parameters. Supports encodeURIComponent for params and encodeURI for full URLs

Encode text to HTML entities or decode entities back to text. Handles named, numeric and hex entities. Bulk text support with instant copy to clipboard.

Convert pixels to REM units and back. Set your base font size, see a reference table of common values, and copy CSS with one click.

Decode JWT tokens to see the header, payload and expiry status. Colour-coded sections with formatted JSON output. Paste any JWT to inspect its contents.