Base64 Encoder/Decoder

Paste any text to encode it as Base64, or paste a Base64 string to decode it back to plain text — instant, in-browser, and handles full UTF-8 without breaking special characters.

What is Base64 Encoder/Decoder?

A Base64 Encoder/Decoder converts between text and Base64-encoded strings. Base64 encoding is essential for embedding binary data in text-based protocols. Our tool supports UTF-8 characters for international text.

Formula

Encoding: Binary data → 6-bit groups → Base64 alphabet (A-Z, a-z, 0-9, +, /) ➡ Decoding: Reverse the process

How to Calculate

Type or paste your text into the input area.
Select Encode or Decode mode.
Click Convert to see the result.
Copy the output to your clipboard.

Example

Encoding "Hello World!" → "SGVsbG8gV29ybGQh". Decoding "U3Vuc2hpbmU=" → "Sunshine". Each 3 bytes of input become 4 Base64 characters.

Key Benefits

Encode and decode instantly
Supports all text including UTF-8
Works entirely in your browser
Free no sign-up needed

Common Mistakes to Avoid

Trying to decode non-Base64 input
Forgetting that Base64 is not encryption
Using the wrong character encoding

Pro Tips

Use URL-safe Base64 for web applications
Base64 is encoding not encryption — never use it for sensitive data
Compress before encoding to minimize size increase

Key Terms Explained

Base64: Text-based binary encoding scheme
Encode: Convert text to Base64
Decode: Convert Base64 back to text
UTF-8: Unicode text encoding supporting all characters

Common Use Cases

Embedding images in HTML/CSS/JSON
Encoding binary data for API transmission
Creating basic authentication headers
Storing binary data in text-based databases

Frequently Asked Questions

What is Base64 encoding?

Base64 is a binary-to-text encoding scheme that represents binary data in ASCII string format. It is commonly used for transmitting data over media designed for text, such as embedding images in HTML or email attachments.

When should I use Base64?

Use Base64 when you need to embed binary data (images, files) in text-based formats like JSON, HTML, CSS, XML, or email. It is also used for basic data obfuscation and API authentication headers.

Does Base64 compress data?

No, Base64 actually increases data size by approximately 33%. It encodes 3 bytes of data into 4 ASCII characters. Use compression before Base64 if file size matters.

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