Base64 to PNG

What the Base64 to PNG tool does

You have a Base64 string that is a PNG, and you want the image file back. Paste it in, press Convert, and the picture appears in a preview, ready to download as a .png, with HTML and CSS snippets alongside if you want them.

Everything happens in your browser, so the image stays on your device.

How to use it

1. Paste your Base64. A bare string works, and so does a full data:image/png URI.
2. Press Convert. The image shows in the preview.
3. Download it as a PNG, or copy the HTML or CSS version.

A clean, lossless round trip

PNG is a lossless format, and that gives this decode a nice property. The Base64 you paste is unpacked straight back into the exact bytes that went in, so the PNG you download is pixel for pixel identical to the one that was encoded. Nothing is approximated or thrown away. Transparency comes along too: if the original PNG had a see-through background or soft edges, that is part of the file, so it survives the round trip untouched. Like its sibling tools, this one decodes rather than converts, so the string you give it should genuinely be a PNG. Fed PNG Base64, it gives you a perfect PNG back.

Why so many Base64 images are PNGs

If you deal with Base64 images much, you will notice a lot of them turn out to be PNGs, and there is a reason. When a browser turns something into Base64, PNG is very often the default it reaches for. The classic example is an HTML canvas: ask it for its contents as a data URL and, unless you say otherwise, you get a PNG. Screenshots, drawing tools, signature pads, and chart libraries all tend to hand out PNG data for the same reason, since it keeps everything sharp and supports transparency. So when an app stores or sends an image as Base64, the odds are good it is a PNG, which makes this the decoder you reach for most. The mechanics are covered in full on the Base64 to Image page.

How it works

The tool wraps your Base64 in a PNG data URI, points an image at it so the browser decodes and displays the picture, transparency and all, and offers that same data back as a file to download. The full explanation lives on the Base64 to Image page.

Questions people ask

How do I convert a Base64 string to a PNG?

Paste the Base64 and press Convert. If it is a PNG, the image appears in the preview and downloads as a .png file.

Will transparency survive?

Yes. Transparency is part of the PNG data, and the tool unpacks that data exactly as it was, so a transparent background comes back intact.

My canvas or screenshot gave me Base64. Is it a PNG?

Very likely. Browsers default to PNG when producing image data, so canvas exports, screenshots, and similar tools usually hand out PNG Base64, which this decodes back into a file.

Does decoding reduce quality?

No. PNG is lossless and the tool only unpacks the existing bytes, so the downloaded image is identical to the one that was encoded.

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/