What is URL-safe Base64?

It replaces + and / with - and _ and drops padding, so the string survives URLs, filenames, and JWT segments unchanged.

Does it handle emoji and non-ASCII text?

Yes - input is encoded as UTF-8 bytes first, so multilingual text round-trips perfectly.

No - encoding and decoding run in your browser tab only.

Base64 Encoder / Decoder - Developer Edition

UTF-8 safe Base64 with a URL-safe alphabet option - encode and decode without leaving your tab.

Base64 for Real-World Payloads

AiLoveKit's developer-focused Base64 encoder / decoder handles full UTF-8 text (emoji included), offers the URL-safe alphabet (-_ without padding) used by JWTs and web tokens, and shows byte counts in both directions. For file-to-Base64 workflows, see the text suite version.

When You Need URL-Safe Base64

JWT segments - headers and payloads use Base64URL encoding.
Query strings - standard +/ characters collide with URL syntax.
Filenames - forward slashes are illegal on most filesystems.

Decoding tokens? The JWT Decoder splits and pretty-prints all three parts for you.

Base64 Encoder / Decoder - Developer Edition

Base64 for Real-World Payloads

When You Need URL-Safe Base64

Frequently Asked Questions