Image to Base64
Convert images to Base64 data URIs for CSS or HTML embedding.
About Image to Base64
Embedding small images as Base64 data URIs eliminates separate HTTP requests: the image travels inside your CSS or HTML. This is standard practice for icons, logos, loading placeholders, and email templates where external images are often blocked. This tool converts PNG, JPEG, GIF, WebP, and SVG files into data URIs locally — your images never leave the browser.
Conversion cost: Base64 encoding inflates the payload by about 33%. That trade is worthwhile for small assets (under ~10 KB) where the saved round-trip outweighs the size increase; for large photos, a regular file with caching remains the better choice. The tool shows both the original and encoded sizes so you can judge instantly.
Output options cover the common use cases: the full data URI for HTML img src attributes, and a ready-made CSS background-image declaration. Everything runs client-side with FileReader — safe for unreleased designs, internal assets, and licensed graphics you cannot upload to third-party converters.
Frequently Asked Questions
When should I embed images as Base64?
For small, frequently-used assets: UI icons, tiny logos, inline SVG fallbacks, and HTML emails. Skip it for photos and anything over ~10 KB — the size overhead and uncachable markup cost more than a request saves.
Why is the Base64 version larger than the file?
Base64 encodes 3 bytes into 4 characters, adding ~33% overhead. Browsers also decode it on every parse. This is the price of zero extra requests.
Are there SEO or performance downsides?
Embedded images are not indexable in image search and bloat the HTML document. Use embedding for functional assets (icons, placeholders), not content images.