What Is Image Base64 Decoding?
Base64-encoded images are text strings that represent the binary data of a picture, often wrapped in a data URI like data:image/png;base64,.... Decoding reverses this process, turning the string back into an actual image you can view, save, or use in other tools.
This tool decodes the Base64 string you paste and renders it as an image entirely inside your browser — nothing is sent to a server.
How to Use the Image Base64 Decoder
- Paste a Base64 string or a full data URI into the input field, or upload a text file containing it.
- If you pasted a raw Base64 string without a data URI prefix, choose the correct image format from the dropdown.
- The decoded image appears automatically below — click "Download" to save it as a file.
Frequently Asked Questions
Is it safe to decode private images here?
Yes. Decoding happens entirely in your browser using JavaScript — the Base64 data is never uploaded or stored on a server.
Why does it say the input is invalid?
This happens if the pasted text contains characters that aren't valid Base64, or if it's incomplete. Make sure you copied the full string with no missing characters.
Why do I need to select an image format?
A raw Base64 string alone doesn't specify what type of image it represents. If your input already includes a data:image/...;base64, prefix, the format is detected automatically and the dropdown is ignored.