PNG to Base64 Converter
Drag in a PNG and instantly get its Base64 string and data URI — with transparency preserved. Copy ready-made HTML and CSS in one click.
100% client-side. Your PNG never leaves your device.
Drop a PNG here
or paste from clipboard · transparency is kept
PNG to Base64, explained
Converting a PNG to Base64 rewrites the file's binary data as a plain-text string so you can embed the image directly inside HTML, CSS, JSON or JavaScript — no separate file to host. PNG is the ideal format for this when you need a transparent background or crisp edges on logos, icons and UI sprites.
Transparency is preserved
Base64 is lossless: it stores the exact bytes of your PNG, alpha channel included. When the browser decodes the data URI, the result is pixel-for-pixel identical to your original — transparent areas stay transparent.
How to use it
<img src="data:image/png;base64,iVBORw0KGgo..." alt="logo" />
.icon { background-image: url(data:image/png;base64,iVBORw0KGgo...); }When to inline a PNG
- Small transparent icons and logos used across a page.
- Self-contained HTML emails or reports where you can't attach files.
- Prototypes and test fixtures that shouldn't depend on external hosting.
For large PNGs, remember Base64 adds roughly 33% to the size — keep big images as normal cached files instead.
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Frequently asked questions
Does converting a PNG to Base64 keep transparency?
Yes. Base64 is lossless — it stores the exact bytes of your PNG including the alpha channel, so the decoded image is pixel-for-pixel identical and transparent areas stay transparent.
What does a PNG Base64 string start with?
A PNG data URI starts with data:image/png;base64, and the encoded body almost always begins with iVBORw0KGgo — the Base64 signature of the PNG header.
Is the conversion private?
Yes. Everything runs in your browser with the FileReader API. The PNG is never uploaded to any server.