Base64 Encoder/Decoder
What is Base64 Encoding?
Base64 is a binary-to-text encoding scheme that represents binary data using 64 printable ASCII characters. It's commonly used to encode data when that data needs to be stored or transferred over media that only supports text, such as email bodies, JSON, XML, or HTML.
The Base64 alphabet consists of uppercase letters (A-Z), lowercase letters (a-z), digits (0-9), and two additional characters (+ and /). The = character is used for padding.
Common Uses for Base64
- Email attachments: MIME uses Base64 to encode binary attachments
- Data URLs: Embed images directly in HTML/CSS using
data:image/png;base64,... - API authentication: Basic auth headers encode credentials in Base64
- Storing binary in JSON: JSON doesn't support binary, so Base64 is used
- URL parameters: Safely pass complex data through URLs
Frequently Asked Questions
Is Base64 encryption?
No. Base64 is encoding, not encryption. It does not provide any security—anyone can decode Base64 text. Never use Base64 to hide sensitive information like passwords.
Why does Base64 make data larger?
Base64 encoding increases data size by approximately 33%. This is because it converts every 3 bytes of input into 4 bytes of output (using only 64 safe characters instead of the full 256 possible byte values).
What happens with non-ASCII characters?
This tool encodes text as UTF-8 before converting to Base64, so characters like émojis 🎉 and international text (日本語, العربية) are fully supported.
Privacy & Limitations
- All calculations run entirely in your browser -- nothing is sent to any server.
- Results are estimates and may vary based on actual conditions.
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Base64 Encoder/Decoder FAQ
What is Base64 Encoder/Decoder?
Base64 Encoder/Decoder is a free text & content tools tool that helps you Encode text to Base64 or decode Base64 to text.
How do I use Base64 Encoder/Decoder?
Enter your input values, review the calculated output, and adjust inputs until you reach the result you need. The result updates in your browser.
Is Base64 Encoder/Decoder private?
Yes. Calculations run locally in your browser. Inputs are not uploaded to a server by default, and refreshing the page clears session data.
Does Base64 Encoder/Decoder require an account or installation?
No. You can use this tool directly in your browser without sign-up or software installation.
How accurate are results from Base64 Encoder/Decoder?
This tool applies standard formulas or deterministic processing logic for estimates. For medical, legal, tax, or investment decisions, verify with a qualified professional.
Can I save or share outputs from Base64 Encoder/Decoder?
You can bookmark this page and copy outputs manually. Results are not persisted in your account and are typically not embedded in the URL.