Image to Base64

About This Tool

Encode any image into a Base64 string you can paste directly into HTML, CSS or JSON — no file hosting needed. Developers use it to inline small icons and logos into stylesheets, embed images in single-file HTML emails, or ship assets inside JSON payloads and configuration files. The tool shows the encoded string with its exact byte size and the resulting data-URI length, so you know whether inlining actually saves a request.

How to Use This Tool

1. Drop the image (PNG, JPG, WebP, SVG, GIF) into the zone.
2. Copy the generated data URI with one click — the format selector switches between CSS (url), HTML (src) and raw Base64.
3. Check the size readout: Base64 inflates the file by about 33%.
4. Paste into your stylesheet or markup.
5. For files over ~10 KB encoded, compare with a regular file reference — inlining is only a win for small assets.

Advantages & Use Cases

Inline a 2 KB logo into transactional email HTML so it renders without remote images, embed icons into a single-file demo or offline documentation, or ship an image inside a JSON API response for a kiosk app. It is also the standard way to add background patterns into CSS without an extra HTTP request.

Supported Formats & Recommendations

• PNG and SVG encode cleanly; SVG as data-URI must be URL-encoded — the tool handles that automatically.
• JPG encodes fine but Base64 does not compress further; shrink the JPG first for smaller output.
• Keep inlined assets under ~5-10 KB; bigger ones belong in real files cached by the browser.

How We Test This Tool

Round-trip testing on every release: encode a reference PNG, decode the produced string, and require byte-identical output. The three output formats (CSS, HTML, raw) are validated against real browsers — a test page using the emitted CSS renders the image identically.

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Helpful Resources

Frequently Asked Questions

Why is the Base64 string bigger than my file?

Base64 encodes 3 bytes into 4 characters, a fixed +33% overhead. That is the price for making binary data text-safe; small assets still win because they save an HTTP round-trip.

Can I inline an image in an email this way?

Yes — data URIs are the reliable way to show images in transactional HTML email. Keep total inline weight under ~100 KB to avoid spam-filter heuristics and Outlook clipping.

Does Base64 embedding work in CSS background-image?

Yes, use the CSS mode output: background-image: url(data:image/png;base64,...). The tool emits the complete ready-to-paste declaration.