PNG to Base64

What the PNG to Base64 tool does

This turns a PNG into a Base64 string, and gives you a ready HTML tag and CSS line with the image already embedded. Add your PNG, press Encode, and copy whichever output you need. It is the encoder you reach for when your image has a transparent background or crisp edges that have to stay sharp.

The work happens in your browser, so the file never gets uploaded.

How to use it

1. Add your PNG. Drag it in or click to choose the file, and check the preview.
2. Press Encode. You get the raw Base64, an HTML image tag, and a CSS background line.
3. Copy what you need. Each output has its own Copy button.

What makes PNG a PNG

PNG is the format for graphics rather than photographs. Two things define it. First, it is lossless, so it keeps every pixel exactly as drawn, which means text stays crisp and hard edges stay clean with none of the smudging you can get from a JPG. Second, and this is the big one, it supports transparency. A PNG can have a see-through background, or soft edges that blend into whatever is behind them, which is why logos, icons, app screenshots, and any graphic that has to sit cleanly on a coloured background are almost always PNGs. The trade is that for a busy photograph, a PNG file is much larger than the equivalent JPG, so PNG earns its keep on graphics, not photos.

Why PNG is the natural fit for inlining

Of all the image formats, PNG is the one that most often deserves to be embedded as Base64, and it comes down to what PNGs usually are: small interface graphics. A little icon, a logo, a button sprite, the kind of thing that is only a couple of kilobytes. Those are exactly the images where inlining pays off, since you skip a network request and the graphic appears the moment the page is parsed. And because the transparency is part of the file, it rides through the encoding untouched, so a transparent icon stays transparent inside the data URI. The classic use is dropping a small icon straight into your CSS as a background, with no separate file to manage. Just keep the same size rule in mind: this shines for small PNGs, not for a giant lossless image. The trade-offs are laid out in full on the Image to Base64 page.

How it works

The browser's FileReader reads your PNG and produces a data URI in the data:image/png;base64, form, which is what the HTML and CSS outputs wrap around. Base64 rewrites the image's binary data, transparency and all, as plain text so it can live inside your code. The mechanics are covered in full on the Image to Base64 page.

Questions people ask

How do I convert a PNG to Base64?

Add the PNG here and press Encode. You get the Base64 string plus ready-to-paste HTML and CSS, each with the image already embedded.

Does the transparency survive?

Yes. Transparency is part of the PNG file itself, and Base64 just re-writes that file as text, so a transparent background comes through the encoding intact.

Can I use this for an icon in my CSS?

That is one of the best uses for it. Encode the small PNG, copy the CSS output, and paste it in as a background image. You save a request and the icon renders immediately, with no separate file to manage.

Should I use PNG or JPG for this?

Use PNG for graphics, logos, icons, and anything needing transparency or sharp edges. Use JPG for photographs, where its smaller size wins. For a photo, the JPG to Base64 tool is the better fit.

References

1. Masinter, L. (1998). RFC 2397: The "data" URL scheme. Internet Engineering Task Force (IETF). https://www.rfc-editor.org/rfc/rfc2397
2. World Wide Web Consortium (W3C), Portable Network Graphics (PNG) Specification. https://www.w3.org/TR/png/