Base64 Encoder Decoder

Convert text and binary data to Base64 encoding and back. Essential tool for data transmission, email attachments, and embedding binary data in text formats.

Enter text or Base64 string:

Or upload a file to encode:

Base64 Encoding Made Easy

Professional Base64 encoding and decoding tools for developers, data engineers, and digital content creators.

Text Encoding

Convert any text string to Base64 format for safe transmission over text-based protocols.

File Encoding

Upload and encode binary files, images, documents, and any file type to Base64 format.

Decode & Download

Decode Base64 strings back to original format and download as files when applicable.

Real-time Processing

Instant encoding and decoding with real-time results. All processing happens in your browser.

Large File Support

Handle large files and long text strings with efficient processing and memory management.

Privacy First

All encoding and decoding happens locally. Your files and data never leave your browser.

Common Use Cases

When and why Base64 encoding is essential in modern web development and data processing.

Email Attachments

Encode binary files for email transmission through SMTP protocols that only support text data.

Use Case:

Embedding images or documents in email messages

Format:

Content-Transfer-Encoding: base64

Data URLs

Embed images, fonts, or other resources directly in HTML, CSS, or JavaScript files.

Example:

data:image/png;base64,iVBORw0KGgo...

Benefit:

Reduces HTTP requests and improves load times

API Authentication

Encode credentials for HTTP Basic Authentication and API key transmission.

Header:

Authorization: Basic dXNlcjpwYXNzd29yZA==

Decoded:

user:password

JSON Web Tokens

JWT headers and payloads are Base64 encoded for secure token-based authentication.

JWT Structure:

header.payload.signature

Each part:

Base64 encoded JSON objects

Database Storage

Store binary data in text-based database fields or when binary columns aren't supported.

Scenario:

Storing images in text fields

Advantage:

Universal database compatibility

Configuration Files

Embed binary resources or sensitive data in configuration files that only support text.