Convert images to Base64 encoded strings for embedding in HTML/CSS. Supports PNG, JPG, GIF, SVG. Free online tool. This tool runs entirely in your browser — no data is sent to any server. It's fast, free, and works on any device.
Base64 encoding converts binary image data into ASCII text, allowing you to embed images directly in HTML, CSS, or JSON without separate file requests. A data URI (data:image/png;base64,...) can replace an image URL anywhere — CSS background-image, HTML img src, or email templates. This eliminates an HTTP request per image, which can speed up pages with many small icons or reduce dependencies in self-contained HTML files. However, Base64 increases size by ~33%, so it's best for small images (under 10KB). For larger images, regular file references with caching are more efficient. This tool handles all common formats and generates both raw Base64 and ready-to-use data URIs.
For small images under 10KB: icons, logos, simple graphics. It saves an HTTP request per image. For larger images, the 33% size increase outweighs the request savings.
Base64 encodes 3 bytes of binary data as 4 ASCII characters, resulting in ~33% size increase. This tradeoff is worth it for reducing HTTP requests on small images but hurts for larger files.
Yes — background-image: url('data:image/png;base64,...'). This embeds the image in your stylesheet. Good for small repeated icons, bad for large backgrounds. CSS files aren't separately cached per image.
It eliminates HTTP requests (faster) but increases HTML/CSS file size (slower). Net effect is positive for small images (<5KB) and negative for large ones. Always measure with your specific use case.
Yes — Base64 is encoding, not encryption. Any Base64 decoder (including our Base64 Encoder tool) can convert it back to the original binary image data.