Base64 Text & File Data URL Encoder / Decoder

TEXT STRING OR FILE PAYLOAD

Operation Mode

Input Text Payload

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BASE64 PROCESSED OUTPUT

Output Result

Base64 Encoding & Data URL Specification Guide

Base64 encoding is widely used across MIME email attachments, JWT signatures, inline CSS images, and API data payloads to transmit binary data over text-only protocols.

Common Base64 Standard RFC 4648 Alphabets

Standard Base64: Uses +, /, and = padding.
Base64URL: Replaces + with - and / with _ for web safety.

Related Developer Tools

Generate JWT tokens with the JWT Encoder, format JSON payloads with the JSON Formatter, or repair malformed JSON with the JSON Repair Tool.

Frequently Asked Questions

Common questions about this tool.

What is Base64 encoding? ▼

Base64 is a binary-to-text encoding scheme (RFC 4648) that represents binary data in an ASCII string format using a 64-character alphabet (A-Z, a-z, 0-9, +, /).

Why does Base64 encoding increase data payload size? ▼

Base64 converts every 3 bytes (24 bits) of raw data into 4 ASCII characters (32 bits), resulting in a ~33% overhead increase in total string size.

What is a Data URL scheme? ▼

A Data URL (`data:image/png;base64,...`) allows inline embedding of images or CSS fonts directly inside HTML and stylesheet documents without additional HTTP requests.

Is my text or file data secure during encoding? ▼

100% secure. Base64 encoding and decoding execute locally in your browser via `btoa()` and `atob()` JavaScript APIs.

What is the difference between Base64 and Base64URL? ▼

Base64URL replaces `+` with `-` and `/` with `_`, stripping `=` padding characters to make the encoded string safe for URL query parameters and JWT tokens.