Base64 Encoder & Decoder Online Free
Encode plain text, JSON payloads, authorization credentials, and binary files into Base64 format and vice versa. Full compliance with RFC 4648, featuring native UTF-8 multi-byte character support (including emojis and international accents) and URL-safe Base64 options.
Base64 Encoder & Decoder In-Browser Workspace
Input data or select files to begin. 100% private, client-side execution with zero server transmission.
How to Use Base64 Encoder & Decoder
- Step 1: Choose your operational mode: 'Encode' to turn text into Base64, or 'Decode' to turn Base64 into plain text.
- Step 2: Type or paste your input into the left-hand text area, or upload any file using 'Upload File to Base64'.
- Step 3: If encoding for web query strings or JWT tokens, check 'URL-Safe Base64' to replace `+` and `/` characters.
- Step 4: Inspect the real-time converted output in the right-hand panel.
- Step 5: Click 'Copy Result' to transfer the string directly to your development clipboard.
About Base64 Encoder & Decoder
Base64 is a binary-to-text encoding scheme that translates raw 8-bit binary data into a set of 64 printable ASCII characters (A-Z, a-z, 0-9, `+`, and `/`). It is ubiquitous across web infrastructure: embedding inline data URIs for images, transmitting Basic HTTP authorization headers (`Authorization: Basic ...`), packaging email attachments via MIME, and structuring JSON Web Tokens (JWT). Standard legacy browser encoding functions like `btoa()` fail when encountering non-ASCII UTF-8 strings (such as emojis or accented foreign characters), throwing `InvalidCharacterError`. Our Base64 Encoder and Decoder solves this by utilizing the W3C `TextEncoder` and `TextDecoder` APIs to ensure 100% loss-free multi-byte stream conversion. All encoding and decoding execute strictly in client-side memory without cloud latency or security vulnerabilities.
Frequently Asked Questions
What is URL-Safe Base64?
Standard Base64 uses `+` and `/` characters, which have reserved meanings in web URLs and query parameters. URL-safe Base64 substitutes `-` for `+` and `_` for `/`, stripping the trailing `=` padding.
Why do standard converters corrupt emojis or foreign characters?
Legacy JavaScript `btoa` only accepts 8-bit Latin1 characters. Characters with higher code points (emojis, Chinese, Arabic) throw errors unless pre-processed with UTF-8 byte encoders.
Does Base64 provide encryption or security?
No! Base64 is an encoding format, NOT encryption. Anyone can decode a Base64 string back into its original plain text in milliseconds.
Are my passwords or secret tokens uploaded to your servers?
Never. All encoding and decoding run locally inside your browser's memory sandbox.