Decode a Base64 String Back Into a Viewable Image File

About the Base64 to Image Converter

There is no file to add here — the input is the text itself. Paste either a complete data URI beginning with the usual prefix, or the bare Base64 string, and the tool decodes it, shows the picture on screen and offers it as a download. Whitespace and line breaks are stripped before decoding, which matters because strings copied out of a log file, an email header or a formatted JSON document are frequently wrapped across many lines.

It also does not simply trust what the string claims to be. After decoding, the first bytes of the data are inspected to identify the real format, and the file is saved with the extension that matches what was actually found rather than what a prefix asserted. If the text is not valid Base64 at all, you get a clear message saying so instead of a broken download. Everything is decoded in the page, which matters when the string came out of a system you are debugging.

Key Features

• Text in, image out: The input is a pasted string rather than a file, so nothing needs saving to disk first.
• Handles both forms: A full data URI with its prefix and a bare Base64 string are both accepted without any switch to set.
• Line breaks tolerated: Whitespace is removed before decoding, so strings wrapped across many lines paste in cleanly.
• Real format detected: The decoded bytes are checked against known signatures, so the saved file carries the extension the data actually is.
• Immediate preview: Recognised images are displayed on screen before you download, so you can confirm you pasted the right blob.

How to Use the Base64 to Image Converter

1. Copy the Base64 string or data URI you want to decode.
2. Paste it into the text box — line breaks and spacing are fine.
3. Decode, and check the preview that appears.
4. Download the file, which is named with the format detected from the data.

How It Works

Any data URI prefix is parsed away, whitespace is stripped, and the remainder is decoded with the browser's built-in Base64 decoder into a byte array. Those bytes are then examined directly: the opening pair identifies PNG, JPEG and GIF, and a signature further into the data identifies WebP, with the detected type overriding whatever the prefix claimed. A Blob is built with that type and offered for download. Anything the decoder cannot parse raises an explicit error rather than producing a corrupt file, and data whose signature matches none of the recognised image formats is still saved, simply with a generic extension.

When You Need It

A developer tracing a bug in an identity verification flow finds the API returns the captured document photograph as a Base64 blob inside a JSON response, and needs to see the actual image to work out whether the upload or the rendering is at fault. That blob is a photograph of a real customer's identity document, so pasting it into a public decoder to view it would turn a debugging step into a data breach. Support engineers inspecting embedded attachments and analysts examining artefacts pulled from logs decode for the same reason.