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title: Image to Base64 Converter — Free Online Tool description: Convert any image to a Base64 data URI instantly. Supports PNG, JPEG, GIF, SVG, WebP, and BMP. Free, private, and works entirely in your browser. date: 2026-05-17

What Is Base64 Image Encoding?

Base64 encoding converts binary image data into a text string made up of letters, numbers, +, /, and =. When combined with a MIME type prefix, it creates a data URI — a self-contained string you can embed directly in HTML, CSS, or JSON without a separate file.

For example, instead of linking to an external file:

<img src="logo.png" alt="Logo" />

You can embed the image inline:

<img src="data:image/png;base64,iVBORw0KGgo..." alt="Logo" />

Why Convert Images to Base64?

Benefit	Description
Fewer HTTP requests	Embedding small images eliminates separate file downloads
Email templates	Many email clients don't load external images — Base64 works inline
Single-file apps	Bundle icons and assets into one HTML file for easy sharing
API payloads	Send images as strings in JSON without multipart uploads
Offline documents	Self-contained HTML reports that work without a server

Supported Image Formats

Format	MIME Type	Extension
PNG	image/png	.png
JPEG	image/jpeg	.jpg, .jpeg
GIF	image/gif	.gif
SVG	image/svg+xml	.svg
WebP	image/webp	.webp
BMP	image/bmp	.bmp

Maximum file size: 10 MB.

Output Formats

This tool provides four output formats:

1. Data URI — Full data:image/...;base64,... string. Use directly in src attributes or CSS url().
2. Base64 Only — Raw Base64 string without the data URI prefix. Useful for API payloads.
3. HTML Tag — Complete <img> element with src, alt, width, and height.
4. CSS Background — Ready-to-use background-image: url(...) declaration.

How to Use

1. Upload an image — Drag and drop onto the drop zone, or click to browse your files.
2. Preview the image — See the uploaded image and its file info (name, size, type, dimensions).
3. Choose output format — Select Data URI, Base64 Only, HTML Tag, or CSS Background.
4. Copy or download — Click Copy to clipboard or Download as a text file.

When to Use Base64 (and When Not To)

Good use cases:

• Small icons and UI elements (under 10 KB)
• Email newsletter images
• Single-file HTML prototypes
• JSON API payloads where multipart isn't available

Avoid for:

• Large photos or hero images (increases file size by ~33%)
• Sites with many images (no browser caching for inline data)
• Repeated images across pages (Base64 can't be cached separately)

Privacy & Security

All processing happens entirely in your browser. Your images are never uploaded to any server. The Base64 conversion is performed client-side using the FileReader API.

Frequently Asked Questions

Does Base64 increase file size? Yes. Base64 encoding increases the original file size by approximately 33%. A 3 KB PNG becomes roughly 4 KB in Base64.

Can I convert Base64 back to an image? Yes. You can paste a data URI into a browser address bar to view the image, or use a Base64 decoder tool to save it as a file.

Is there a file size limit? This tool accepts images up to 10 MB. For larger files, consider using a command-line tool like base64 on Linux/macOS.

Does it work with SVG files? Yes. SVG files are converted to Base64 just like raster images. Note that for SVG, you can also inline the SVG markup directly in HTML for better performance.