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How to Convert Between Base64 and Images
The Base64 Image tool converts images to Base64 data URIs (for embedding in HTML/CSS) and decodes Base64 strings back to downloadable images.
- Upload an image to encode it as a Base64 data URI, or paste a Base64 string to decode.
- Copy the data URI for use in HTML <img> tags or CSS background-image.
- Download the decoded image in its original format.
When to Use Base64 Images
Base64 data URIs embed images directly in HTML or CSS, eliminating an HTTP request. This is useful for tiny icons, email templates, and single-file HTML documents. However, Base64 increases the encoded size by ~33%, so it is not recommended for large images. The sweet spot is images under 10 KB.
Why Use Our Base64 Image Tool?
- Bidirectional — encode images to Base64 and decode Base64 to images.
- Copy-ready output — complete data URI string for HTML/CSS.
- Multiple formats — JPEG, PNG, WebP, GIF, and SVG.
- Private — images never leave your browser.
Frequently Asked Questions
When should I embed images as Base64?
Embed small images (under 10 KB) like icons and logos to reduce HTTP requests. For larger images, a regular file reference is more efficient because Base64 adds 33% overhead.
Does it work with SVG?
Yes. SVG files can be encoded to Base64 data URIs and used in <img> tags or CSS background-image.
Can I use Base64 images in emails?
Yes. Embedding images as Base64 data URIs ensures they display without requiring external image hosting. Many email clients support this.
Are my images private?
Yes. All processing runs locally in your browser.