Base64 Encoder Decoder - Encode & Decode Base64
Encode and decode text and files to Base64 format instantly. Secure, client-side data conversion for developers with our free online Base64 tool.
Encode & Decode Instantly
The fastest way to translate text and files into Base64 strings and back. Secure, client-side, and developer-friendly.
RFC 4648
Fully compliant with standard Base64 encoding schemes, ensuring compatibility across all systems.
Live Conversion
See your results refresh instantly as you type or paste content. No waiting required.
File Support
Easily upload images or documents to generate their Base64 string representations.
Secure & Private
All processing happens locally in your browser. Your data never leaves your device.
How this Base64 Encoder Decoder - Encode & Decode Base64 works
This bidirectional converter transforms binary data to printable ASCII text using Base64 encoding scheme defined in RFC 4648, enabling safe transmission of binary content through text-only channels like email or JSON. The encoder processes input byte sequences in 24-bit groups (three bytes), converting each group into four 6-bit values that map to a 64-character alphabet comprising uppercase letters A-Z, lowercase a-z, digits 0-9, plus (+), and slash (/) symbols.
Encoding mechanics partition input into three-byte blocks, creating four Base64 characters per block through bit shifting and masking operations. When input length isn't divisible by three, padding characters (=) appear at output end to signal incomplete final groups - one pad indicates two final input bytes, two pads indicate one final byte. Decoding reverses this process, interpreting four-character blocks back into three original bytes by mapping each Base64 character to its 6-bit value then concatenating bits into proper byte boundaries.
The tool supports multiple input types including plain text (converting via UTF-8 encoding), file uploads for binary data like images or PDFs, and hexadecimal strings for low-level data manipulation. Output displays in copyable text areas with automatic line wrapping at 76 characters per RFC 2045 MIME standards when requested. Common applications include embedding image data directly in HTML/CSS through data URLs, encoding authentication credentials in HTTP headers, storing binary configuration in text-based formats like JSON or XML, or obfuscating text from casual observation without cryptographic security.
For JWT tokens specifically, try our JWT Decoder. For URL-safe encoding, use our URL Encoder Decoder.
How to use this Base64 Encoder Decoder - Encode & Decode Base64
Paste or Type Input
Enter the text you want to encode, or paste a Base64 string you want to decode back into plain text.
Choose Encode or Decode
Select the direction — encode converts plain text to Base64; decode reverses a Base64 string back to readable text.
Copy the Result
Click the copy button to grab the output and paste it into your code, API request, or email.
Example Usage
Encoding a plain text string to Base64:
Frequently Asked Questions
What is Base64 encoding?
What's the difference between Base64 encoding and encryption?
What can I encode or decode with Base64?
Why is my Base64 decode failing?
Is this Base64 tool secure?
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The Base64 Encoder Decoder - Encode & Decode Base64 is maintained by CodeItBro. We aim to provide the best free developer tools on the web. If you have feedback or suggestions, please visit our contact page.
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