Free limit: 10 MB — Need more? Paid tier supports up to 100 MB.
Preview
Encoding Statistics
Original
—
Encoded
—
Dimensions
—
Format
—
Size Inflation
Decode Base64 to an image
Accepts data:image/…;base64,… or raw Base64 — auto-detects format
Decoded Image
Decoding Information
Detected Type
—
Input Mode
—
Dimensions
—
Base64 Length
—
What is Base64 Image Encoding?
Base64 encoding converts binary image data into a plain text string using 64 ASCII characters (A–Z, a–z, 0–9, +, /). This lets you embed images directly in HTML, CSS, JavaScript, JSON payloads, and email templates without needing a separate image file or HTTP request.
The trade-off is size: Base64 encoded images are approximately 33% larger than the original binary file. For small assets like icons, logos, and thumbnails, this overhead is usually worthwhile for the convenience of inline embedding.
When Should You Use Base64 Images?
Base64 encoding is ideal for small images under 10 KB where avoiding an HTTP request improves page load performance, for embedding in CSS stylesheets as background images, for including images in API responses and JSON data, for email templates where external image hosting may not be reliable, and for single-page applications that bundle all assets.
Supported Formats
ENCODE64 supports the five most common web image formats: PNG (lossless, transparency), JPEG (lossy, photographs), WebP (modern format with superior compression), GIF (animations and simple graphics), and SVG (vector graphics, resolution-independent).
Privacy & Security
This tool processes everything locally in your browser using the JavaScript FileReader and Canvas APIs. No images are uploaded to any server. No data is stored. No cookies are set for tracking purposes. Your files never leave your device.