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Base64 Encoder & Decoder

Encode text and files to Base64 strings, or decode valid Base64 back to original files. Supports images, PDFs, and text. Free developer tool.

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About Base64 Encoder & Decoder

1

Select Input

Paste text directly or upload a binary file.

2

Choose Action

Click 'Encode' to create a string, or 'Decode' to reveal the data.

3

Get Result

Copy the string or download the decoded file.

Base64 is an encoding group used to represent binary data in an ASCII string format. It is essential when you need to transfer binary data (like images or PDF files) over protocols that are designed to handle text (like JSON APIs, HTML, or Email).

  • Debug APIs: Decode cryptic Base64 strings from API responses to see the actual JSON or text content.
  • Embed Assets: Convert small icons or images into "Data URIs" (e.g., data:image/png;base64,...) to embed them directly into HTML/CSS, reducing HTTP requests.
  • File Compatibility: Ensure binary files make it through text-only systems without corruption. Our tool uses the native FileReader API to process everything locally. Whether you are encoding a private key or a personal photo, it never leaves your machine.

Key Features

Bidirectional

Seamlessly switch between Encoding (to Base64) and Decoding (from Base64).

File Support

Upload images, PDFs, or text files to get their Base64 string instantly.

Data URI Generation

fast adds the correct MIME type prefix for use in HTML/CSS.

Large File Support

Handle larger strings and files efficiently in the browser.

Frequently Asked Questions

It's a Base64 string prefixed with the file type (e.g., data:image/png;base64,...), allowing browsers to render it as an image.

Base64 encoding increases the file size by approximately 33% because it uses 4 characters to represent every 3 bytes of data.

Yes. If you paste a valid PDF Base64 string, our tool will decode it and let you download the .pdf file.

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