Base64 Encoder / Decoder
Encode and decode Base64 and URL-safe Base64 (base64url). UTF-8 aware, privacy-first, processed entirely in your browser.
Base64url replaces "+" with "-" and "/" with "_" and omits padding. Useful for URLs, JWTs, etc.
All processing is done locally in your browser. Your data never leaves your device.
How It Works
Base64 is a binary-to-text encoding that represents binary data using 64 ASCII characters. Our tool processes everything locally in your browser using native JavaScript APIs.
Step-by-Step Process:
- Paste your text or binary data into the input field
- Choose 'Encode' to convert to Base64, or 'Decode' to convert from Base64
- Toggle 'URL-safe' if the Base64 will be used in URLs or filenames
- Copy the result or download it as a file - all processing stays on your device
Use Cases
Base64 encoding is essential for web development, data transmission, and storage scenarios where binary data needs to be represented as text.
Web Development
Embed images in CSS/HTML using data URLs, store binary data in JSON/XML formats, and handle API tokens safely.
Email & Communication
Email attachments use MIME Base64 encoding to ensure binary files are transmitted correctly through text-based protocols.
URL & File Safety
Use URL-safe Base64 for web parameters, filenames, and any scenario where + and / characters could cause issues.
Data Storage
Store binary data in databases, configuration files, or any text-based storage system that doesn't support binary formats.
Privacy Promise
Your data security is our top priority. Our Base64 tool operates with complete privacy protection.
🔒 Your data never leaves your browser - 100% client-side processing guaranteed
Frequently Asked Questions
What is the difference between Base64 and Base64url?
Base64url is URL-safe: it replaces + with - and / with _ to avoid conflicts in URLs and filenames. This makes it perfect for web applications and file systems.
Can I encode binary files?
Yes, you can drag and drop files or paste binary content. The tool handles both text and binary data seamlessly using browser APIs.
Is my data safe?
Absolutely. All encoding and decoding happens in your browser using native JavaScript APIs. No data is uploaded to our servers or any third-party services.
Why do I see padding characters (=)?
Base64 uses = for padding to ensure the encoded string length is a multiple of 4 characters. This is required by the Base64 specification.
What happens if I try to decode invalid Base64?
The tool will detect invalid Base64 strings and show a clear error message, helping you identify and fix formatting issues.