Base64 Image Converter
Convert images to Base64 encoded data URLs for embedding directly in HTML, CSS, or email templates — or decode Base64 strings back into downloadable images. All processing runs locally in your browser for maximum privacy and speed.
Image to Base64 Converter
Upload an image to generate its Base64 data URL for use in HTML image tags.
Image Preview
Base64 to Image Converter
Paste a Base64 data URL to convert it back to an image.
Converted Image
How Base64 Image Encoding Works
Base64 encoding converts binary image data into a sequence of printable ASCII characters. Every three bytes of binary data become four Base64 characters, resulting in roughly a 33% size increase. The encoded string is prefixed with a data URL scheme (e.g., data:image/png;base64,) that tells the browser how to interpret the data.
When decoding, the process is reversed: the Base64 characters are converted back into the original binary bytes, reconstructing the image exactly as it was before encoding.
Common Use Cases
- Embedding images in HTML/CSS — Reduce HTTP requests by inlining small icons and logos directly in your markup or stylesheets.
- Email templates — Some email clients block external images; Base64 embedding ensures images display without requiring the user to "load images".
- JSON and API payloads — Transmit image data within JSON objects without needing multipart form encoding.
- Single-file applications — Bundle all assets into one HTML file for easy distribution or offline use.
Frequently Asked Questions
What is Base64 image encoding?
Base64 image encoding converts binary image data into an ASCII text string. This allows you to embed images directly in HTML, CSS, or JSON without needing a separate image file.
What image formats are supported?
This tool supports PNG, JPG/JPEG, GIF, BMP, WebP, and SVG image formats for Base64 encoding and decoding.
Is my image data secure?
Yes. All processing happens entirely in your browser using JavaScript. Your images are never uploaded to any server, ensuring complete privacy.
Is there a file size limit?
The tool recommends files up to 5 MB. Larger files will work but may cause slower performance since all processing happens in the browser. Base64 encoding increases the data size by approximately 33%.