Image to Base64
🔒 In your browserConvert an image to a Base64 data URI with preview + CSS/HTML.
Great for embedding small icons/images directly in CSS or HTML (avoids an extra request). 🔒 Runs entirely in your browser.
🔒 Files stay on your device: conversion happens entirely in your browser using the FileReader API — your file is never uploaded to any server, unlike many other online converters.
About the Image to Base64
Inlining a small image as Base64 saves an HTTP request and keeps assets self-contained. This free image-to-Base64 converter turns a PNG, JPG, GIF or SVG into a data URI with a live preview and ready-to-paste CSS and HTML snippets.
The image is processed in your browser and never uploaded.
How to convert an image to Base64
- Select an image file.
- Preview it and copy the data URI, or the ready-made CSS background or HTML img snippet.
- Best for small icons and images where inlining beats a separate request.
When to inline an image
Encoding a small image as a Base64 data URI lets you embed it directly in CSS or HTML, removing a separate network request — handy for tiny icons and logos. The trade-off: Base64 makes data about a third larger and can't be cached separately, so it's a poor choice for large images. Inline the small stuff; keep big images as normal files.
Frequently asked questions
Why embed an image as Base64?
Inlining a small image as a data URI removes a network request and keeps the asset inside your CSS or HTML, which can speed up loading for tiny icons and logos.
Should I inline large images?
No. Base64 makes data about 33% larger and can't be cached separately, so it's best for small images. Keep large images as normal files.
Is my image uploaded?
No. The image is read and encoded locally in your browser.
Should I inline large images as Base64?
No. Base64 inflates size by roughly 33% and can't be cached independently, so it's best for small icons. Large images should stay as separate, cacheable files.
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🔗 Embed this tool on your website — free
Copy this and paste it into your page's HTML. The tool runs in the visitor's browser, just like here. Change height to fit, or add the optional auto-resize snippet below. Add ?theme=dark to the URL for dark mode.
<iframe src="https://toolhq.dev/embed/image-to-base64/" title="Image to Base64 — ToolsHub" width="100%" height="520" style="border:1px solid #e5e7eb;border-radius:12px;max-width:680px" loading="lazy"></iframe>Optional: auto-resize the iframe height
Add this once on the same page so the iframe grows to fit the tool:
<script>
addEventListener("message", function (e) {
if (e.data && e.data.type === "toolshub:resize") {
document.querySelectorAll('iframe[src*="/embed/"]').forEach(function (f) {
if (f.contentWindow === e.source) f.style.height = e.data.height + "px";
});
}
});
</script>