Base64 Encoder/Decoder
Encode and decode Base64 data instantly. Perfect for web developers, API testing, and data encoding. Supports text, URLs, and binary data conversion.
Tool Purpose & Audience
Encode and decode Base64 data instantly. Perfect for web developers, API testing, and data encoding. Supports text, URLs, and binary data conversion.
Key Features
- Bidirectional standard Base64 encoding and decoding
- URL-safe Base64 mode toggle (replaces +/ with -_)
- Real-time instant conversion as you type
- One-click swapping between encode and decode modes
- Copy to clipboard and direct file download options
- Comprehensive metrics: Character, word, and line counts
- 100% private processing—data never leaves your browser
Real-World Use Cases
- Generating Basic Authentication headers for API requests
- Embedding small images, fonts, or assets directly into CSS/HTML files
- Safely transmitting complex data structures via URL parameters
- Passing binary data through legacy text-based protocols (like SMTP)
- Decoding JWT payloads or generic Web Tokens for inspection
- Sanitizing special characters for safe storage in non-UTF databases
How It Works: The 64-Character Set
Base64 encoding works by dividing every three bytes (24 bits) into four 6-bit chunks. Each 6-bit chunk correlates to a specific character from a standard table containing:
- A-Z (26)
- a-z (26)
- 0-9 (10)
- + and / (2)
If the input data isn't a multiple of three bytes, "=" padding characters are added to ensure the output always has a valid length.
Technical Security Note
Important Visibility Information
Base64 is NOT encryption. It is simple encoding designed for compatibility, not security. Never use Base64 to "secure" passwords or sensitive PII (Personally Identifiable Information) as it can be reversed instantly by any user.
Always process Base64 data locally. Our tool performs all operations in your browser, so your unencoded data is never transmitted to our servers.
Sponsored Content
How does our Base64 encoder/decoder work?
Our Base64 encoder/decoder is a simple tool that allows you to easily convert text to or from the Base64 scheme. Base64 is a binary-to-text encoding method that translates binary data into a string of ASCII characters. To encode, simply type your text and the Base64 output appears instantly. To decode, switch the mode and paste your Base64 string.
What is URL-Safe Base64 encoding?
Standard Base64 uses the '+' and '/' characters, which have special meanings in URLs and can break web links. URL-safe Base64 replaces the '+' with a minus ('-') and the '/' with an underscore ('_'). It also often strips the '=' padding. Our tool provides a dedicated toggle to instantly switch to URL-safe mode.
Is Base64 considered secure encryption?
No! Base64 is encoding, not encryption. It is designed solely to ensure data integrity during transmission across text-based protocols. Anyone with access to a Base64 string can instantly decode it. Never use Base64 to secure passwords or sensitive information.
What are the origins of Base64?
Base64 encoding was introduced in the early days of computing to safely transmit binary data over text-based protocols, like early email systems (SMTP). The name 'Base64' comes from its use of a 64-character subset of ASCII: uppercase letters (26), lowercase letters (26), digits (10), and two symbols (+ and /).
Is my text data safe when using this tool?
Absolutely. Our tool operates entirely locally within your web browser using JavaScript. Whatever text or data you paste into the input boxes never leaves your device and is never transmitted to or stored on our servers.
Is my data safe and private?
Yes, all processing happens locally in your browser. Your text never leaves your device, ensuring complete privacy and security.
Is this tool free to use?
Absolutely! All our tools are completely free with no hidden costs, registration requirements, or usage limits.
Does this work on mobile devices?
Yes, our tools are fully responsive and work perfectly on desktop, tablet, and mobile devices.
Which browsers are supported?
Our tools work in all modern browsers including Chrome, Firefox, Safari, and Edge. No plugins or extensions required.