Free Image to Base64 Converter — Encode Images Online
This free tool encodes any image into a Base64 data URI you can paste directly into HTML, CSS, JSON, or code. It's instant, secure, and runs entirely in your browser — your image is never uploaded.
What is Base64 image encoding?
Base64 is a way of representing binary data — like an image — as plain text. A Base64 “data URI” lets you embed an image directly inside a web page or stylesheet instead of linking to a separate file, which can save an extra network request for small assets like icons.
How to convert an image to Base64
- Upload your image. Drag it in or choose a file.
- Get the Base64. The data URI is generated instantly.
- Copy it. Paste the string into your HTML, CSS, or code.
When should you use Base64 images?
Base64 is great for tiny, frequently-used graphics like icons and inline SVGs, where avoiding an extra request helps performance. Avoid it for large images: Base64 makes data roughly 33% bigger and can't be cached separately, so big inline images slow pages down.
Privacy & Security
Everything happens on your device. Your image is encoded in the browser and is never uploaded to a server, so your data stays private.
Frequently Asked Questions
How do I convert an image to Base64?
Upload your image and the tool instantly produces a Base64 data URI you can copy and paste into your code.
What is a Base64 data URI?
It's a text encoding of binary data that lets you embed an image directly in HTML, CSS, or JSON without a separate file.
Is it free and private?
Yes. It's free with no signup, and your image is encoded in your browser — nothing is uploaded.
Should I always inline images as Base64?
Base64 is handy for tiny icons, but it makes files larger and isn't cached separately, so avoid it for large images.
Does it work on mobile?
Yes, it works on phones, tablets, and desktops.
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ToolBox Team
We build fast, privacy-minded utilities for everyday file work — image, PDF, and text tools you can trust in the browser.