Why does native browser btoa() fail on emojis or accented text?

Classic btoa() only accepts single-byte Latin1 characters. ToolCix encodes strings through UTF-8 TextEncoder first so emojis and international scripts never throw errors.

What is URL-safe Base64 (Base64URL)?

Base64URL replaces + and / with - and _ and omits trailing = padding so tokens transmit safely inside URLs and JWTs.

Is Base64 a form of encryption?

No. Base64 is a reversible transport encoding, never encryption. Never rely on Base64 alone to hide sensitive secrets.

Are my tokens or API keys logged?

Never—all encoding and decoding runs exclusively in your browser memory.

Converters100% Client-Side4.9 (740 ratings)

Base64 Encoder & Decoder

Essential for backend and frontend developers debugging JWT segments, data URIs, HTTP Basic Auth headers, and binary payloads.

URL-Safe Base64URL

Plain UTF-8 Text

Result

VG9vbENpeDogRmFzdCwgcHJpdmF0ZSAmIFVURi04IHNhZmUg8J+agA==

How to Use Base64 Encoder & Decoder

1Select Encode or Decode mode (plus optional URL-safe Base64URL toggle).
2Paste UTF-8 text, a Base64 string, or drop a small file to inspect its Data URI.
3View the instant UTF-8-safe conversion using TextEncoder/TextDecoder.
4Copy output or swap input/output to verify round-trip fidelity.

Key Features

Full UTF-8 emoji and Unicode support (no btoa Latin1 crashes)
Standard Base64 and RFC 4648 URL-safe Base64URL modes
Drag-and-drop file-to-Base64 Data URI generator
Strict validation error hints on malformed Base64 input

Safe Local Base64 Encoding for Tokens and Data URIs

Pasting production authorization headers, configuration blobs, or JWT payloads into random web utilities creates unnecessary security exposure. ToolCix processes every byte strictly inside your browser tab with zero network calls.

Unlike naive scripts that break on multi-byte Unicode characters, our converter pairs Web TextEncoder and TextDecoder with RFC 4648 padding rules for rock-solid UTF-8 and Base64URL support.

Common Developer Workflows

Quickly inspect decoded JSON claims from authorization tokens and format the output in our JSON Formatter, or convert small SVG icons into inline CSS data URIs.