Free online UTF-8 to UTF-16 converter — compare UTF-8 bytes and UTF-16 code units for any text instantly in your browser. No data is stored. Shows per-character byte breakdown, surrogate pairs for supplementary plane characters, and encoding size comparison.
Free online UTF-8 to UTF-16 converter — compare UTF-8 bytes and UTF-16 code units for any text instantly in your browser. No data is stored. Shows per-character byte breakdown, surrogate pairs for supplementary plane characters, and encoding size comparison.
Runs entirely in your browser. No data is sent to our servers.
Show UTF-8 bytes and UTF-16 code units for each character
Base64 Encode
Free online Base64 encoder — convert text to Base64 format instantly in your browser. No data is stored. Supports UTF-8 text, optional URL-safe encoding, and handles multi-byte characters.
Base64 Decode
Free online Base64 decoder — convert Base64 encoded strings back to plain text instantly in your browser. No data is stored. Supports standard and URL-safe Base64, handles padding, and decodes UTF-8 multi-byte characters.
Base64URL Encode
Free online Base64URL encoder — encode text to URL-safe Base64 format instantly in your browser. No data is stored. Produces RFC 4648 output with -_ instead of +/ and no padding, ideal for JWTs and URL parameters.
Base64URL Decode
Free online Base64URL decoder — decode URL-safe Base64 encoded strings back to text instantly in your browser. No data is stored. Handles RFC 4648 format with -_ characters and missing padding.