Web Dev Tools
Base64 Encoder / Decoder
Convert text or binary data to Base64 format and decode Base64 strings back to text instantly. Supports UTF-8 characters and handles large inputs efficiently.
Use Base64 Encoder / Decoder to get instant results without uploads or sign-ups. Everything runs securely in your browser for fast, reliable output.
Your results will appear here.
About this tool
Base64 is a group of binary-to-text encoding schemes that represent binary data in an ASCII string format. It is essential for transmitting data over media that are designed to deal with textual data (like email or JSON APIS).
Our Base64 Encoder/Decoder is built for developers. Unlike simple tools that crash on UTF-8 characters (like emojis 🚀), our tool handles multi-byte characters correctly. It ensures your data integrity during conversion.
This tool runs entirely in your browser. You can paste sensitive API keys, tokens, or private data to decode them without worrying about them being sent to a server.
Usage examples
Simple Text
Hello World
Hello World → SGVsbG8gV29ybGQ=
UTF-8 Support
Unicode Chars
Code 💻 → Q29kZSDwn5is
Decoding
Base64 to Text
SGVsbG8= → Hello
API Token
Decode authorization token
Bearer token → Decoded credentials (view only, never share)
Data URI
Encode image for HTML/CSS
Image bytes → data:image/png;base64,iVBORw0KG...
How to use
- Paste your text into the "Input" field.
- Select "Encode" to convert text to Base64.
- Select "Decode" to convert Base64 back to text.
- Click "Copy Result" to save the output.
- Toggle "URL Safe" if you need URL-friendly Base64 strings.
Benefits
- Bi-directional conversion (Encode <-> Decode)
- Full UTF-8 / Emoji Support
- URL-Safe mode (Replace +/ with -_)
- Live mode (Convert as you type)
- Handles whitespace cleaning automatically
- No server-side processing
- Instant Copy to Clipboard
FAQs
What is Base64?
Base64 is a way to represent binary data using 64 printable characters (A-Z, a-z, 0-9, +, /). It allows binary data to be sent via email, HTML, or JSON safely. It's used for encoding images in CSS/HTML (data URIs), API tokens, email attachments, and web storage.
Why does my decoded text look like garbage?
This happens if you try to decode a string that isn't valid Base64, or if the original encoding used a different character set. Base64 strings should only contain A-Z, a-z, 0-9, +, /, and = (padding). Any other characters indicate invalid Base64. Ensure your input is properly encoded.
Is this URL safe?
Standard Base64 uses "+" and "/" which can cause issues in URLs and filenames. Our "URL Safe" mode replaces "+" with "-" and "/" with "_" per RFC 4648. Use URL-safe Base64 for query parameters, file names, or cookies to avoid encoding issues.
Can I encode images or files to Base64?
Yes, but you need the file as binary data first. For images, use FileReader API in JavaScript to get base64. This tool handles text encoding/decoding. For embedding images in HTML/CSS, use data URIs: data:image/png;base64,[encoded-string]. Note that Base64 increases size by ~33%.
Does Base64 encrypt data?
No! Base64 is encoding, not encryption. Anyone can decode Base64 instantly. Never use it for passwords, secrets, or sensitive data security. Use encryption (AES, RSA) for security. Base64 only ensures data integrity during transmission, not confidentiality.
Why is my Base64 string longer than my original text?
Base64 encoding increases data size by approximately 33%. This is because it uses 6 bits per character to represent 8-bit data. Every 3 bytes becomes 4 characters. The "=" padding at the end ensures proper alignment. This overhead is the trade-off for text-safe transmission.
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