Convert Base64 to PNG Online
Paste a Base64 string or data URI and turn it back into a real image. Preview it instantly, download the decoded file, and keep the whole job inside your browser.
How to Decode Base64 Into a PNG
Paste the encoded string into the decoder, click Decode to see the picture, then download it. Decoding happens locally, so nothing you paste is sent to any server.
Step 1
Paste String
Put a raw Base64 string or a full data URI into the box.
Step 2
Run Decode
Click Decode and the image renders in the preview panel below.
Step 3
Save File
Save the decoded picture to your device as an image file.
Decode Base64 Strings Back Into Real PNG Files in Your Browser
Decoding is the half of the job people hit second and search for just as often. A colleague sends an encoded logo in a ticket, an API returns image data inside a JSON field, a config file carries an inline graphic, or a mail template needs to be checked before it ships. In every one of those cases the only thing you can see is a wall of characters, and what you actually need is the picture. Turning that string back into a viewable, downloadable file is the entire point of this decoder.
Paste either form and the tool handles it: a bare Base64 payload with no header, or a complete data URI that already declares its type. The decoder converts the characters back into bytes, hands them to the browser as an image, and renders a preview you can check straight away. If the string came from a PNG, transparency survives the round trip, so a decoded logo still drops cleanly onto any background instead of arriving with a solid box around it.
The decoded result is not trapped in the page. You can download it as a file and drop it into a project, compare it against the original asset, or open it in an editor to confirm the payload carried what it claimed. That makes the tool genuinely useful for debugging, which is where most decoding happens: checking whether an API really returned the right image, or whether a string was truncated somewhere in transit.
Everything runs locally with the browser’s own decoding, so pasting sensitive material carries no risk. There is no upload, no account, and no retained copy, and a sample button lets you try the workflow before you paste anything real. When a string fails to decode, the cause is nearly always one of three things: missing characters, a wrong or absent MIME type, or content that is not actually image data at all.
A few practical habits save time once you decode regularly. Payloads copied out of logs often carry stray line breaks, and removing those fixes most failures outright. Strings pulled from JSON frequently keep their surrounding quotes, so trim them before you paste. When the payload came from a PNG, downloading the result gives you a file whose transparency is intact, which is the fastest way to prove the data survived the round trip. Because decoding is local, none of this touches a server, and the sample button lets you rehearse the whole flow before pasting anything sensitive.
Paste Either Form
Accepts a bare Base64 string or a complete data URI with its prefix.
Instant Preview
Decoded bytes render immediately so you can confirm the payload is right.
Download File
Save the decoded image to your device and use it in any project.
Keeps Transparency
PNG payloads decode with the alpha channel preserved, so edges stay clean.
Local Decoding
Characters become bytes in your browser, and nothing is sent to a server.
Sample Included
Load a sample string first to see the workflow before pasting real data.
FAQ
Frequently Asked Questions
No. The decoder accepts a full data URI or a raw Base64 string and works out how to read it, so you can paste exactly what you were given without cleaning it up first.
No. Decoding happens inside your browser, so the characters you paste never travel to a server at any point, and no copy is kept once you close or reload the page.
Yes. The alpha channel is part of the encoded PNG data, so a decoded logo keeps its see-through edges instead of arriving with an unwanted solid box around the artwork every time.
The usual causes are missing characters from a truncated copy, a wrong or absent MIME type, or pasting text that is not image data at all, so check the source first.
Yes. Copy the field that holds the image data, paste it into the decoder, and preview the result to confirm the API really returned the picture you expected it to return.
You get the image the string actually contains, in the format it was originally encoded from, ready to download, open in an editor, and drop into any project you are working on right now.
Large strings take longer to process and use more browser memory, but decoding runs on your device, so the practical limit is your machine rather than a fixed cap imposed by the tool.
Yes. Switch the panel back to Image to Base64, drop in a picture, and copy the string or the data URI it produces, with optional line wrapping for mail and config files.