Base64 Encoder/Decoder

Encode and decode Base64 data instantly

How to use this tool

Follow these simple steps to encode or decode Base64 data:

  1. Enter your data into the input field
  2. Choose your action:
    • Click "Encode to Base64" to convert text into Base64 format
    • Click "Decode from Base64" to convert Base64 back to plain text
  3. Review the output in the right-hand field
  4. Copy the result using the "Copy Output" button
  5. Clear both fields with "Clear All" when finished

All encoding and decoding happens locally in your browser your data never leaves your device.

Best for these scenarios

This Base64 encoder/decoder is particularly useful in these common situations:

  • API development Encode data for API requests and decode responses
  • Data transmission Safely encode binary data for text-based protocols
  • Web development Embed images as Base64 strings in HTML and CSS
  • Authentication Encode credentials for Basic Auth headers
  • Debugging Decode Base64 payloads to inspect their contents
  • File conversion Convert small files to Base64 for data URIs

Whether you're building APIs, debugging payloads, or embedding assets, this tool helps you work with Base64 encoding efficiently.

Tips and limitations

To get the most out of this Base64 encoder/decoder, keep these points in mind:

  • Data size Base64 encoding increases size by ~33%, so large inputs produce larger outputs
  • Browser compatibility Works in all modern browsers (Chrome, Firefox, Safari, Edge)
  • Privacy All processing happens locally; no data is sent to servers
  • Input validation Invalid Base64 strings will show an error when decoding
  • Character support Handles standard ASCII and UTF-8 characters for encoding
  • Limitation Base64 is not encryption; do not use it for sensitive data

For large files or binary data, consider using file upload tools instead of pasting text into this encoder.

How Base64 encoding works

Base64 is a text encoding scheme that converts binary or plain text into an ASCII string using a set of 64 characters. It is commonly used when data needs to be safely transmitted or embedded in systems that expect text.

When to use this tool

Use the encoder when you need to turn text into Base64, and the decoder when you need to recover the original text from a Base64 string. Everything happens locally in your browser.

Best practices

  • Check the input before decoding to avoid invalid Base64 errors.
  • Use the copy button to transfer the output quickly.
  • Remember that Base64 is encoding, not encryption.

Related Tools

Frequently Asked Questions

Is Base64 a form of encryption?

No. Base64 is encoding only. It is reversible and does not provide security on its own.

Can I decode any Base64 string?

Only valid Base64 strings can be decoded. If the input is invalid, the decoder will show an error.

Is my data uploaded anywhere?

No. All encoding and decoding happens locally in your browser.

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