đ Base64 Encoder Decoder
Instantly encode plain text to Base64 or decode Base64 strings back to readable text â free, private, and browser-side.
Result
How to Use This Tool
- Paste your input â Type or paste plain text to encode, or a Base64 string to decode into the box above.
- Pick your action â Click Encode to Base64 to convert text, or Decode from Base64 to reverse it.
- Check the result â Your output appears immediately in the result box below the buttons.
- Copy or download â Use the Copy button for quick clipboard access, or Download to save the result as a .txt file.
Key Features
Instant Results
Encoding and decoding happen entirely in your browser â zero server round-trips, zero delay.
Full Unicode Support
Handles Hindi, Tamil, Arabic, Chinese, emoji, and every UTF-8 character without errors.
100% Private
Your text never leaves your device. No data is sent to any server at any point.
Downloadable Output
Save encoded or decoded results directly as a .txt file with one click.
Error Validation
Clear error messages appear if invalid Base64 is detected, so you always know what went wrong.
Works on Any Device
Fully responsive layout works on mobile, tablet, and desktop without installing anything.
How It Works
Base64 encoding takes every 3 bytes of input and converts them into 4 printable ASCII characters chosen from a set of 64 characters: AâZ, aâz, 0â9, +, and /. Padding characters (=) are added when the input length is not a multiple of 3.
Encoding formula: Input bytes â groups of 6 bits â Base64 character lookup. For every 3 input bytes you get 4 output characters, making the output roughly 33% larger than the original.
Unicode handling: This tool first converts your text to UTF-8 bytes using encodeURIComponent + unescape before encoding, so non-ASCII characters (like âš, ä, æŧĸ, or đ) work correctly without data loss.
Decoding: The process is reversed â each group of 4 Base64 characters is converted back to 3 bytes, then decoded from UTF-8 to the original string.
Practical Examples
đŽđŗ Hindi Text Encoding
Input: ā¤¨ā¤Žā¤¸āĨā¤¤āĨ ā¤ĻāĨā¤¨ā¤ŋā¤¯ā¤ž
Encoded: 4Kā¸Sā¸...â (UTF-8 Base64 output ensures all Devanagari characters are preserved perfectly)
đ API Key Transmission
Use case: Many REST APIs require credentials in Base64 format inside Authorization headers. Encode username:password and paste directly into your API call.
đŧī¸ Data URI for Images
Use case: Embed small images directly into HTML/CSS using data:image/png;base64,<encoded>. Paste your Base64 image string here to verify or decode it.
đ¯đĩ Japanese Character Support
Input: ãããĢãĄã¯ä¸į
Japanese text encodes cleanly through UTF-8 handling. Decode the result back to confirm round-trip accuracy.
What Is a Base64 Encoder Decoder?
A Base64 encoder decoder is a tool that converts binary or text data into a safe ASCII string format and back again. It was originally designed for email systems that could only handle plain text, and today it is a fundamental building block across web development, APIs, cryptography, and data storage.
Whether you are a developer embedding fonts in CSS, a system admin decoding JWT tokens, or someone curious about how data is encoded â this tool handles it in seconds without any software installation.
Read the full guide on our blog: What Is Base64 Encoding and When Should You Use It? â
Frequently Asked Questions
Is this tool free to use?
What is Base64 encoding?
Can I decode any Base64 string?
Does Base64 encoding compress my data?
Is Base64 a form of encryption?
Does this tool support Hindi, Tamil, and other Indian scripts?
Where is Base64 most commonly used?
Is my data sent to your servers?
What does the = sign at the end of Base64 output mean?
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Contact Us
Have a question, found a bug, or want to suggest a new tool? Reach out any time.