Image to Base64 Converter

Convert any image to a Base64 encoded string or data URI online for free. Supports PNG, JPG, and WebP output formats. Copy with one click.

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What Is Base64 Image Encoding?

Base64 encoding converts binary image data into a plain text string made up of letters, numbers, and a few symbols. This lets you embed images directly into HTML, CSS, or JSON without needing a separate image file. The output is a data URI you can paste straight into your code.

The encoding process reads each byte of the image and maps it to one of 64 printable ASCII characters. Because three bytes of binary data become four characters of text, the resulting string is roughly 33% larger than the original file. For small images like icons, logos, and UI elements, this trade-off is worth it.

When Should You Use Base64 Images?

Base64 data URIs work best for small images under 10KB, such as icons, favicons, or simple logos. They are especially useful in HTML emails (where linked images are often blocked by email clients), single-file HTML documents, inline CSS backgrounds, and anywhere you want to reduce the number of HTTP requests.

For larger images, base64 encoding is usually a bad idea. The 33% size overhead means a 100KB image becomes about 133KB of text, and browsers cannot cache inline data URIs the way they cache separate image files. If your image is larger than 20-30KB, hosting it as a separate file is almost always better for performance.

Base64 Output Format Options

Format	Data URI Prefix	Best For
PNG	data:image/png;base64,...	Icons, logos, graphics with transparency
JPEG	data:image/jpeg;base64,...	Photos, thumbnails, previews
SVG	data:image/svg+xml;base64,...	Vector graphics, scalable icons
GIF	data:image/gif;base64,...	Simple animations, tiny graphics
WebP	data:image/webp;base64,...	Modern browsers, smaller file sizes

Frequently Asked Questions

How much larger is a base64 encoded image?

Base64 encoding increases the data size by approximately 33%. A 10KB image becomes roughly 13.3KB of text. This is because every 3 bytes of binary data are represented as 4 ASCII characters. For small images this overhead is negligible, but for larger files it adds up quickly.

Can I use base64 images in CSS?

Yes. You can use a base64 data URI as the value of a background-image property, like background-image: url('data:image/png;base64,...'). This is commonly used for small repeating patterns, icons, or decorative elements to avoid extra HTTP requests.

Is this tool free and private?

Yes, completely free with no limits. Your image is converted entirely in your browser using JavaScript. The file never leaves your device and is not uploaded to any server.

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