Encode and decode Base64 strings instantly with our free online tool. Fast, secure, and easy to use for developers and IT professionals.
Base64 encoding converts binary data into ASCII text format. It's commonly used for transmitting data over text-based protocols like email or JSON.
⚠️ Invalid Base64 string. Please check your input and try again.
Base64 decoding converts Base64 encoded text back to its original format. Ensure your input is valid Base64 to avoid errors.
All encoding and decoding happens in your browser. Your data never leaves your device, ensuring complete privacy and security.
Instant encoding and decoding with real-time results. No server delays, no waiting, just immediate conversion.
Full support for international characters, emojis, and special symbols. Encode any text format with confidence.
Copy encoded or decoded results to your clipboard instantly with a single click. Save time and avoid errors.
Switch seamlessly between encoding and decoding modes. Both tools in one convenient interface.
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Base64 is an encoding scheme that converts binary data into ASCII text format. It uses 64 printable characters (A-Z, a-z, 0-9, +, /) to represent data, making it safe for transmission over text-based protocols.
The encoding process takes every 3 bytes of binary data and converts them into 4 ASCII characters. This increases the data size by approximately 33%, but ensures compatibility with systems that only handle text data.
Base64 encoding is widely used in web development, email transmission (MIME), data URIs, authentication tokens, and storing complex data in JSON or XML formats. It's not encryption—it's simply a way to represent binary data in a text-safe format.
MIME protocol uses Base64 to encode email attachments, ensuring binary files can be transmitted through text-only email systems.
Embed images and files directly in HTML or CSS using Base64-encoded data URIs, reducing HTTP requests.
Basic HTTP authentication encodes credentials in Base64 format for transmission in Authorization headers.
Store binary data like images or files within JSON or XML documents using Base64 encoding.
Many APIs use Base64 to encode JWT tokens, API keys, and other credentials for secure transmission.
Store binary data in text-only database fields by encoding it in Base64 format first.
Click either the "Encode" or "Decode" tab depending on what you need. The encode tab converts plain text to Base64, while the decode tab converts Base64 back to plain text.
Type or paste your text into the input field. For encoding, enter any plain text. For decoding, enter a valid Base64 string. The tool processes data in real-time.
Results appear automatically in the output field as you type. For encoding, you'll see the Base64 string. For decoding, you'll see the original text.
Click "Copy Result" to copy the output to your clipboard, or "Clear All" to reset both fields and start over with new data.
Base64 uses 64 characters to represent data:
The encoding algorithm follows these steps:
No, Base64 is not a security measure or encryption. It's simply an encoding format that makes binary data text-safe. Anyone can decode Base64 strings. Never use Base64 alone to protect sensitive information, use proper encryption instead.
The = character is padding used to ensure the Base64 output length is divisible by 4. Padding is added when the input data length isn't a multiple of 3 bytes. One = means one byte of padding, while == means two bytes.
This tool is designed for text encoding. For files (images, PDFs, etc.), you would need to first convert the file to a binary format, then encode it. Use specialized file encoding tools for that purpose.
Yes! Once the page is loaded, all encoding and decoding happens entirely in your browser using JavaScript. No internet connection is required for the tool to function.
Your data never leaves your device. All processing happens client-side in your browser. We don't store, log, or transmit any data you enter into the tool.
This error occurs when the input contains characters outside the Base64 character set, has incorrect padding, or is corrupted. Ensure your Base64 string is properly formatted and contains only valid characters (A-Z, a-z, 0-9, +, /, =).
Absolutely! Our Base64 encoder/decoder is completely free to use for personal and commercial projects. There are no usage limits or licensing restrictions.