What does the Image to Base64 tool do?
A data URI embeds an image directly inside HTML, CSS or JSON, no separate file, no extra request. Ideal for small icons, email signatures and self-contained documents.
Drop an image and get the complete data URI (and the raw Base64 alone), encoded locally. Note the ~33% size overhead: data URIs are for small images.
Frequently asked questions
When should I use a data URI?
Small images (a few KB) used once: icons, logos in emails. Large or repeated images belong in files the browser can cache.
Why is the Base64 bigger than my file?
Base64 encodes 3 bytes as 4 characters: a fixed ~33% overhead.
Do data URIs work in email?
In most clients for small images, yes, but some (notably older Outlook) block them; test your audience.
Is the image uploaded?
No: encoding happens in your browser.