When should I use Base64 image embedding?

Use it for: small icons/UI elements (<10KB), reducing critical HTTP requests, email HTML (where remote images may be blocked), offline apps, and storing images in JSON. Avoid for large images — increases size by ~33% and prevents caching.

How do I use a Base64 image in HTML?

— replace the Base64 string with your encoded image data and adjust the MIME type.

How do I use a Base64 image in CSS?

.element { background-image: url("data:image/png;base64,iVBORw0KGgo..."); } — use the full data URI as the background-image value.

Why does Base64 increase file size?

Base64 encoding represents every 3 bytes of binary data as 4 ASCII characters, resulting in a 33% size increase. This overhead is why Base64 embedding is only recommended for small images.

A data URI (data URL) is a URL that contains data directly instead of pointing to an external file. Format: data:[mimetype][;base64],[data]. Supported in all modern browsers for images, fonts, and other resources.

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Image to Base64

Convert images to Base64 encoded strings for embedding in HTML and CSS.

Updated Mar 2026100% Private — runs in browser

Click to upload or drag and drop

JPEG, PNG, WebP, GIF, SVG — max 10MB

How to Use Image to Base64

1
Upload an image by dragging and dropping or clicking to browse.
2
The Base64 encoded string is generated instantly.
3
Copy the Base64 string, HTML img tag, or CSS background-image syntax.
4
Paste directly into your HTML, CSS, or JSON.
5
Use the size indicator to confirm the encoded image is small enough to inline.

About Image to Base64

Convert any image to a Base64-encoded data URI for direct embedding in HTML, CSS, or JSON with our free image to Base64 converter. No separate image file needed — embed images directly in your code.

Key Features

All Formats: Supports JPEG, PNG, WebP, GIF, and SVG.
Ready-to-Use Output: Generates the Base64 string, HTML img tag, and CSS background-image syntax.
Size Indicator: Shows encoded string length so you can judge if inlining is appropriate.
Instant Conversion: Results appear immediately after upload.

When to Use Base64 Images

Ideal for small icons and UI elements under 10KB to reduce HTTP requests. Also useful for email HTML templates (where remote images may be blocked) and offline apps. For larger images, serving from a CDN is better — Base64 increases size by ~33% and prevents browser caching.

Privacy & Security

Runs 100% in your browser — your images never leave your device. No signup required.