Base64 Encoder & Decoder

Encode text or files to Base64 instantly, or decode Base64 strings back to plain text. Supports standard and URL-safe (Base64URL) encoding. Encodes live as you type.

URL-safe encoding (Base64URL — replaces + with -, / with _, strips padding)

About the Base64 Encoder & Decoder

Base64 is a binary-to-text encoding scheme that represents binary data using 64 printable ASCII characters. It is widely used to encode binary files for transmission over text-based protocols such as email (MIME), embed images directly in HTML or CSS, and encode credentials in HTTP Basic Authentication headers.

Features

Live encoding — output updates instantly as you type
Encode any text including Unicode, emoji, and multi-byte characters
URL-safe Base64 (Base64URL) — replaces + with -, / with _, and strips = padding
Swap buttons — send encoded output straight to the decoder and vice versa
Shows size before and after encoding
100% client-side — your data never leaves your browser

Standard vs URL-safe Base64

Standard Base64 — uses +, /, and = padding. Used in MIME email, HTTP Basic Auth, and general data encoding.
URL-safe Base64 (Base64URL) — replaces + with - and / with _, and omits padding. Used in JWTs, OAuth tokens, and URL parameters.

Common uses

Embedding images in HTML as data:image/png;base64,...
HTTP Basic Authentication headers: Authorization: Basic <base64(user:pass)>
Encoding binary data in JSON payloads
JWT token parts (header and payload are Base64URL encoded)
Encoding email attachments in MIME format