Image to Base64

Turn images into Base64 data URIs for HTML and CSS embedding.

🔒 Conversion happens in your browser — your image is never uploaded.

What Does the Image to Base64 Converter Do?

This converter turns any image into a Base64 data URI — a text representation you can embed directly in HTML, CSS, JSON or JavaScript, eliminating a separate image file and its HTTP request. You get three outputs at once: the complete data URI, the raw Base64 payload without the data: prefix, and a ready-to-paste CSS background-image rule. Uniquely for an image tool, everything runs in your browser — the image is read locally with the FileReader API and never uploaded.

How to Convert an Image

  1. Drop an image (PNG, JPG, WEBP, GIF or SVG, up to 5 MB) into the zone.
  2. The preview, data URI, raw Base64 and CSS snippet appear instantly.
  3. Copy whichever output your project needs.

When Embedding Beats Linking

  • Tiny UI assets — icons, dividers and patterns under a few KB load with zero extra requests.
  • Self-contained files — single-file HTML reports, email templates and offline documents where external images would break.
  • JSON APIs — shipping a small image inside a JSON payload (avatars, generated thumbnails).
  • Quick prototyping — paste an image straight into CodePen or a snippet without hosting it.

The trade-off: Base64 is ~33% larger than the binary original and cannot be cached separately from the document. Embed small images; link large ones.

Frequently Asked Questions

Is my image uploaded to your server?

No — this tool is 100% client-side. The FileReader API reads the file inside your browser and the Base64 string is generated locally. Nothing ever leaves your device.

Why is the Base64 version larger than my file?

Base64 encodes every 3 bytes of binary as 4 text characters, adding about 33%. That overhead is the price of representing binary data as plain text.

What is the size limit for embedding, practically?

Keep embedded images under ~10 KB as a rule of thumb. Beyond that, the loss of caching and the 33% overhead usually outweigh the saved request — link the file instead.

How do I use the data URI in HTML?

Put it straight into the src attribute: <img src="data:image/png;base64,iVBOR…" alt="…">. In CSS, use it inside url() as the generated snippet shows.