Base64 Encoder Decoder
Encode plain text to Base64 or decode Base64 strings back to readable text — instantly and privately in your browser.
How to Use the Base64 Encoder Decoder
- Type or paste your plain text or Base64-encoded string into the input text area.
- Choose Encode to convert plain text to Base64, or Decode to convert Base64 back to plain text.
- Press the Convert button to process your input and generate the result instantly.
- Your encoded or decoded output appears in the result area. Click Copy to Clipboard for easy use.
- Use the Clear button to reset all fields and perform another conversion.
Key Features
Instant Conversion
Encode or decode Base64 strings in milliseconds with zero delay or loading screens.
100% Private
All processing runs in your browser. Your data never leaves your device or hits any server.
Full UTF-8 Support
Handles special characters, accented letters, emojis, and multilingual text with precision.
Works on All Devices
Responsive design ensures perfect performance on phones, tablets, and desktops alike.
One-Click Copy
Copy your encoded or decoded result to clipboard instantly with a single button press.
Two-Way Conversion
Switch between encoding and decoding modes seamlessly without reloading the page.
How Base64 Encoding Works
Base64 encoding converts binary or text data into a string of ASCII characters drawn from a set of 64. The character set includes uppercase letters (A–Z), lowercase letters (a–z), digits (0–9), plus (+), and slash (/). A padding character (=) is appended when the input length isn't evenly divisible by 3.
3 input bytes (24 bits) → 4 Base64 characters
2 input bytes (16 bits) → 3 Base64 characters + 1 padding (=)
1 input byte (8 bits) → 2 Base64 characters + 2 padding (==)
Variables explained:
Each byte of input data is 8 bits. During encoding, these bits are regrouped into 6-bit segments. Each 6-bit segment maps to one of 64 printable ASCII characters. If the final group has fewer than 6 bits, it is padded with zeros, and "=" characters are added to the output to maintain the 4-character block alignment.
For UTF-8 text (characters beyond ASCII), the text is first encoded into UTF-8 bytes, then those bytes undergo Base64 encoding. This tool handles that two-step process automatically so you don't have to worry about character encoding issues.
Practical Examples
🇮🇳 Priya — Mumbai, India
Priya is a backend developer embedding a small JSON config inside an HTML data attribute. She needs to encode it safely.
Input: {"apiKey":"test123","region":"ap-south-1"}
Mode: Encode
Output: eyJhcGlLZXkiOiJ0ZXN0MTIzIiwicmVnaW9uIjoiYXAtc291dGgtMSJ9
🇮🇳 Arjun — Bengaluru, India
Arjun received a Base64 string from an API response and needs to check what data it contains.
Input: V2VsY29tZSB0byBCZW5nYWx1cnUh
Mode: Decode
Output: Welcome to Bengaluru!
🇺🇸 Sarah — Austin, USA
Sarah is encoding an email attachment's authorization header value for a REST API call.
Input: user:secretPassword2024
Mode: Encode
Output: dXNlcjpzZWNyZXRQYXNzd29yZDIwMjQ=
🇮🇳 Kavitha — Chennai, India
Kavitha wants to encode a Tamil greeting to embed safely in a URL parameter.
Input: வணக்கம்!
Mode: Encode
Output is a UTF-8 Base64 string that safely represents the Tamil text in any URL or API.
What Is Base64 Encoding and Decoding?
Base64 is a binary-to-text encoding scheme that represents binary data using a set of 64 printable ASCII characters. It was originally designed for transferring data over channels that only support text, such as email (MIME) and embedding data inside HTML, CSS, or JSON.
Developers use Base64 daily for tasks like encoding images as data URIs, creating HTTP Basic Authentication headers, transmitting binary files through APIs, and storing small amounts of data in cookies or URL parameters. It is one of those fundamental tools that is simple yet indispensable.
It is important to understand that Base64 is not encryption. It provides no security whatsoever — anyone can decode a Base64 string. Its purpose is data representation and safe transport, not confidentiality.
Base64 Encoding Across Languages
📖 Want to learn more about Base64 and its real-world applications?
Read Our Complete Guide to Base64 Encoding and Decoding →Frequently Asked Questions
Is this tool free to use?
What is Base64 encoding?
Is my data safe when using this tool?
Can I encode special characters and emojis?
What happens if I try to decode an invalid Base64 string?
Is Base64 encryption?
Can I use this tool on mobile?
Is there a character limit for input?
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