Image to Base64 Converter
Convert any image to a Base64 string or data URI. Free, instant, browser-only — your files stay private.
Convert Images to Base64 Instantly
Convert an image to a Base64 string or a ready-to-use data URI so you can embed it directly in HTML, CSS, or JSON — no separate file request needed. Conversion happens entirely in your browser, and encoding adds roughly 33% to the file size.
Embed it, or link to it?
| Situation | Recommendation |
|---|---|
| Tiny icon or logo, under ~10 KB | Embed as Base64 |
| Self-contained email template | Embed as Base64 |
| Image reused across many pages | Link to a file (keeps browser caching) |
| Anything over a few KB | Link to a file |
Keep in Mind
Past a few kilobytes, embedding starts to hurt more than it helps: a Base64 image inside CSS forces the whole stylesheet to re-download whenever any part of it changes, and the image itself is never cached separately by the browser.
Need to remove metadata first? Use Strip EXIF before converting. Want to shrink the image? Try Compress JPEG or Resize Image.
Frequently asked questions
What is a data URI?
A data URI embeds the whole image inside a string (starting with data:image/...), letting you place it directly in HTML or CSS instead of linking a file.
When should I embed an image as Base64?
For tiny icons or single-use images, embedding saves an HTTP request. For larger or reused images, a normal file is more efficient.
Why is the Base64 bigger than the file?
Base64 encoding adds about 33% overhead because it represents binary data using text characters.
Is it private?
Yes — the image is encoded locally in your browser with no upload.
Are data URIs good for email images?
Yes — email clients often block external images by default, so embedding as Base64 makes the image display immediately without needing the recipient to allow external content.
Does embedding an image as Base64 hurt page speed?
It can, past a few kilobytes. A Base64 image loses browser caching — if it’s inside CSS, the whole stylesheet re-downloads whenever any part of it changes.
What’s the biggest advantage of a data URI?
Self-containment — a report, offline document, or single-file HTML page can ship with its images built in, with no external file requests at all.
Can I use the Base64 string directly in an <img> tag?
Yes — paste the full data URI (including the data:image/... prefix) straight into an <img src="..."> attribute or a CSS background-image: url(...).