Image to Base64 Converter — Encode & Decode
Convert images to Base64 data URIs for inline CSS, HTML, and JSON. Reverse decode Base64 strings back to image files. 100% private.
Upload image to encode
Max 5MB · JPG, PNG, WebP, GIF, SVG, BMP
Base64 expands file size ~33% — keep source small
What is Image to Base64 Converter?
Converting small images into Base64 Data URIs eliminates additional HTTP requests by embedding bitmap data directly into HTML, CSS, or JSON payloads. Our Image to Base64 Converter provides bidirectional encoding and decoding directly in your browser using the HTML5 FileReader API with zero server uploads or external data transmission.
Designed for accuracy, speed, and privacy, this tool runs entirely on your local device with zero network latency.
How to Use the Image to Base64 Converter
- 1Select your desired mode: "Encode Image to Base64" or "Decode Base64 to Image".
- 2To encode, upload or drag and drop an image file (PNG, JPG, SVG, WebP, or GIF).
- 3Copy the generated Data URI, Raw Base64 string, CSS background-image snippet, or HTML <img> tag.
- 4To decode, paste a Base64 string into the decoder to preview and download the reconstructed image file.
Formula & Calculation Logic
Encodes binary image bytes into 64 ASCII characters (RFC 4648 standard). The encoding process increases raw byte size by approximately 33% (4 output ASCII characters for every 3 input bytes).
Data URI Format: data:[<mediatype>][;base64],<data>Image to Base64 Converter Frequently Asked Questions
Related File & Image Tools
Explore more free tools in this category
Image Compressor
Compress PNG, JPEG, and WebP images in-browser with adjustable quality and instant size comparison.
Image Resizer
Resize image dimensions by width, height, percentage, or social media presets with aspect ratio lock.
Image Format Converter
Convert images seamlessly between PNG, JPG, WebP, BMP, and GIF formats in seconds.
Background Remover (Canvas)
Remove solid white or colored backgrounds from logos, icons, and signatures with threshold controls.