Encode and decode text without corrupting it
The Base64 Encode / Decode tool converts text through UTF-8 before encoding, so emoji and accented characters round-trip correctly — a step the browser’s built-in btoa() skips, which is why many converters corrupt anything beyond plain ASCII. The URL Encoder / Decoder percent-encodes query strings and paths, and decodes those %20-riddled links back into readable text. Both directions earn their keep: encoding when you build a URL by hand, decoding when you want to know what a tracking link actually contains before you click it.
The HTML Entity Encoder / Decoder escapes characters like angle brackets and ampersands so user-supplied text can sit inside a page without being parsed as markup, and turns entity-riddled exports back into plain readable text. The Text to Binary Converter translates text into ones and zeros and back — mostly used for teaching and puzzles, but it makes the byte-level view of a string concrete in a way no explanation quite manages.
Convert numbers, bases and timestamps
Two converters deal with numbers rather than text. The Number Base Converter moves values between binary, octal, decimal, hexadecimal and any base up to 36 — handy for reading permission bits, color values or anything a debugger prints in hex. The Unix Timestamp Converter turns epoch seconds or milliseconds into human-readable dates and back again, which is the fastest way to check what moment a raw number in your logs or database actually refers to, in both UTC and your local time zone.