Base64 Encoder/Decoder

About this tool

Base64 encoding converts binary data into ASCII text, making it safe for transmission in text-based protocols like JSON, XML, and email. Our Base64 Encoder/Decoder handles both text-to-Base64 conversion and file-to-Base64 encoding (including images for data URIs). Base64 is widely used for embedding small images directly in HTML and CSS, transmitting binary data in APIs, encoding authentication credentials, and creating data URIs. While Base64 increases data size by approximately 33%, it eliminates the need for separate file requests — making it ideal for small icons, logos, and thumbnails. The tool processes everything in your browser, keeping your data private.

How to use Base64 Encoder/Decoder

1. Enter text to encode, or paste Base64 to decode.
2. Use the 'File' tab to encode images and files to Base64.
3. Click 'Encode' or 'Decode' based on your need.
4. Copy the result for use in your application.

Tips & best practices

• Base64-encoded images can be embedded directly in HTML and CSS.
• Data URIs (data:image/...) include the Base64 data with MIME type.
• Base64 increases data size by about 33%, so use judiciously.
• Small images (icons, logos) are good candidates for Base64 embedding.

Common use cases

• Embedding small images directly in HTML without separate image files.
• Encoding binary data for transmission in JSON APIs.
• Creating data URIs for CSS background images.
• Decoding Base64 strings received from APIs or configurations.

Privacy

This tool runs entirely in your browser. We do not upload, store, log, or process your input on any server. Open your browser's DevTools Network tab to verify — there is no outbound request with your data. See our Privacy Policy for details.