Image to Base64
Convert an image to a data URI.
Image to Base64 at a glance
Image to Base64 is a free online image tool you can use right now to convert an image to a data URI โ no account, no install and no usage limit. It runs entirely inside your browser, so whatever you enter stays on your own device.
- Price
- Free โ no trial, no paid tier, no watermark
- Sign-up
- Not required
- Where it runs
- In your browser โ nothing is uploaded to a server
- Works on
- Chrome, Safari, Firefox and Edge โ desktop, tablet and phone
- Category
- Image Tools
Choose an image to get a Base64 data URI. Runs entirely in your browser.
About Image to Base64
Convert an image into a Base64 data URI that can be embedded directly in HTML, CSS or JSON, removing the need for a separate file request.
The trade-off is specific and worth understanding before using it. Base64 encoding inflates size by roughly 33%, because it represents three bytes using four characters. In exchange you eliminate one HTTP request. For a small icon that is usually a good trade; for anything substantial it is a bad one, since you are shipping a third more data and the embedded image cannot be cached separately from the document containing it.
That caching point is the one people miss. A linked image is fetched once and reused across every page that references it. An inlined image is re-downloaded with every page that embeds it, and changing the document invalidates the image along with it. Inlining a large hero image can make a site measurably slower rather than faster.
The genuinely good uses are small: icons, simple SVGs, a placeholder, or embedding an image in an email template or a self-contained HTML file where external references would not resolve. A rough guideline is to inline below a few kilobytes and link above it.
How to use Image to Base64
- Select your image file.
- Copy the generated data URI.
- Paste it into an img src, a CSS url() or a JSON field.
Frequently asked questions
Why does the Base64 version look bigger than my image?
Because Base64 encodes three bytes as four characters, inflating size by about 33%. You trade extra bytes for one fewer HTTP request, which only pays off on small files.
When should I inline an image rather than link it?
For small assets โ icons, simple SVGs, placeholders โ and for self-contained files such as email templates where external references may not load. Below a few kilobytes is a reasonable rule.
Does inlining hurt caching?
Yes, and this is the main drawback. A linked image is cached once and reused everywhere; an inlined one is re-downloaded with every page embedding it, and changing the page invalidates the image too.
Is my image uploaded?
No. Encoding happens in your browser, so the file never leaves your device.