UtilsBuddy

Base64 Encode / Decode

Plain Text

Base64 Output

How to Use Base64 Encode / Decode

  1. Choose Encode or Decode

    Select Encode mode to convert plain text to a Base64 string, or Decode mode to convert a Base64 string back to readable text.

  2. Paste Your Input

    Type or paste your plain text (for encoding) or your Base64 string (for decoding) into the input box. Full UTF-8 support including emojis and international characters.

  3. Copy the Result

    Click Encode or Decode and copy the output. Use the Swap button to quickly reverse the direction and verify the round-trip conversion.

Free Online Base64 Encoder & Decoder

Encode & Decode in Seconds

Convert plain text to Base64 encoding or decode Base64 strings back to readable text with a single click. The tool handles UTF-8 characters including emojis, accented letters, and international scripts correctly.

Essential Developer Utility

Base64 encoding is used everywhere in web development: embedding images in CSS as data URIs, encoding Basic Authentication headers for REST APIs, and transmitting binary data through JSON payloads. Keep this tool bookmarked for quick conversions.

Swap Direction Instantly

Use the Swap button to quickly reverse directions, putting the output as the new input. Useful for verifying that your encoding and decoding round-trips correctly without any data loss or character corruption.

When to Use Base64

Base64 is commonly used when sending binary data through systems that only handle text: email attachments (MIME), storing binary blobs in JSON, URL encoding for data URIs, and embedding fonts or images directly into HTML and CSS files.

Frequently Asked Questions about Base64 Encode/Decode

Base64 is a binary-to-text encoding scheme that represents binary data as an ASCII string. It's commonly used in email attachments, data URLs, API authentication headers, and embedding data in HTML/CSS.

Yes. Switch between Encode and Decode modes. Encode converts plain text to Base64, and Decode converts Base64 strings back to readable text.

Yes. Our tool properly handles UTF-8 encoded text including special characters, accented letters, emojis, and characters from non-Latin scripts like Chinese, Arabic, and Hindi.

Base64 is used for embedding images in CSS/HTML (data URIs), encoding authentication credentials (Basic Auth), transmitting binary data over text-based protocols, and storing binary data in JSON.

There's no strict limit since processing happens in your browser. However, very large inputs (over 10MB) may be slow depending on your device's capabilities.