Base64 Image Decoder (Data URI to File)
Base64 images show up everywhere: HTML img tags, CSS backgrounds, API payloads, and debug logs. But a Base64 blob is not very useful if you just want to see the picture. This Base64 image decoder turns a Base64 string or a full data:image/...;base64,... URI into a real file you can preview and download. The tool detects common formats like PNG, JPG, WebP, and GIF, then creates a local blob for download. If your input is missing a data URI header, you can choose an assumed MIME type to decode it correctly. Everything runs client-side in your browser, so you can decode private assets without sending data to a server.
No uploads. Decoding happens in your browser memory.
How to Decode a Base64 Image
- Paste Base64 (with or without a data URI header)
- Pick an assumed MIME if the input has no header
- Click Decode to preview the image
- Download the decoded file using your preferred filename
Why Data URIs Work
Data URIs embed binary as text: A data URI includes a MIME type and a Base64 payload, like data:image/png;base64,iVBORw0KG.... Browsers can decode it and render it immediately.
Magic bytes help detection: PNG, JPEG, GIF, and WebP have recognizable signatures. This tool checks the first bytes to guess the correct MIME type when no header is present.
Private by default: Decoding happens in your browser memory. No uploads, no server logs, and no tracking of your input.