Base64 Encoder and Decoder – Convert Text or Files to Base64 Format
The Base64 encoder converts text, URLs, or files to Base64 format and back. The tool works in your browser without server connection, so your data stays on your device.
Base64 encoding is widely used in programming: email attachment encoding, API calls, JWT tokens, and transferring files in text format. The calculator supports UTF-8 text, URLs, and files.
What is Base64 encoding used for?
Base64 is especially useful in situations where binary data needs to be transmitted through text-based channels like HTTP headers or JSON fields. It's not an encryption method, but just an encoding format. Common use cases include embedding images in HTML as data URIs and passing authentication credentials.
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Browse all tools →The Base64 encoder converts text or files to Base64 format and back. A handy tool for developers who need Base64 encoding for API calls or email attachments.
Enter text or a file, and the tool converts it to a Base64 string. You can also decode Base64-encoded content back to its original format.
- Encode text or files to Base64 format with one click.
- Decode Base64 strings back to readable text or files.
- Copy results to clipboard easily for further use.
Base64 is an encoding method, not an encryption method – it doesn't protect data content.
- Base64 encoding increases data size by about 33%.
- Encoding provides no security – anyone can decode it.
- Most commonly used for transferring binary data in text-based formats.
The tool works entirely in your browser, so your data never leaves your device.
- Don't use Base64 encoding to protect confidential information.
- Processing very large files may slow down your browser.
- Results follow standard Base64 encoding (RFC 4648).