Base64 to Image

Decode Base64 to an image and download it

Base64-encoded images turn up everywhere: inside HTML src attributes and CSS files, in JSON responses from APIs, in database exports, in email source code and in the output of a canvas toDataURL() call. The Base64 to Image converter turns that wall of characters back into a picture you can see, check and save.

Paste a full data URI or just the Base64 text. The decoder ignores line breaks, spaces, quotes and the surrounding HTML, CSS or Markdown, works out the real file type from the decoded bytes, shows the dimensions and size, and downloads the file with the correct extension. When something is wrong, it tells you exactly what — an invalid character, a missing piece, or data that is not an image at all. Decoding happens in your browser, so sensitive data never leaves your device.

How to use the Base64 to Image

1. Paste your Base64 string or data URI into the box — the decoder runs as soon as you stop typing. Press “Try an example” to see how it works.
2. Look at the preview and the details: detected type, pixel dimensions, decoded size and Base64 length.
3. Read any notes, for example when the data URI claims a different type than the data really is, or when the string looks cut off.
4. Optionally change the file name, then press the download button. The extension is chosen from the detected type.

Base64 to Image features

Recognise an image type from its first Base64 characters

Every file format starts with a fixed signature, so its Base64 text starts with fixed characters too. That lets you identify a string at a glance — and spot a data URI whose MIME type does not match its content.

Why a Base64 image will not decode

• It was cut off. Long strings are often truncated by log viewers, spreadsheets (Excel cells hold at most 32,767 characters) or a copy that missed the end. A truncated image may show only its top part or nothing at all.
• Plus signs became spaces. When Base64 travels in a URL query string, “+” can be turned into a space. The decoder detects this and repairs it automatically.
• Extra escaping. JSON may contain \/ and \n; percent-encoding may turn + into %2B. Both are cleaned up before decoding.
• Two strings pasted together. An “=” sign in the middle of the data means one Base64 value ended and another started.
• It is not an image. Base64 can hold any file. If the result is text, a ZIP or a PDF, the tool says so instead of showing a broken picture.

Working with the decoded file

Need a different format after decoding? Convert the downloaded file to JPG, PNG or WebP with the image converter. To go the other way and turn a picture into Base64, use Image to Base64, and for decoding Base64 that contains text rather than an image, use the Base64 encoder and decoder. If the string came from an API response, the JSON formatter helps you find it in the payload.