Base64 to Image
Decode a Base64 string or data URI back into an image, preview it, and download the file. Auto-detects PNG, JPG, GIF, and WebP. All client-side.
Runs in your browser — nothing uploaded
Base64 or data URI
Turn a Base64 string back into a viewable, downloadable image. Paste a raw Base64 blob or a complete data URI and instantly see the picture, its format, and its size — handy for inspecting inline images from CSS, HTML, JSON payloads, or API responses.
Private by design — your data never leaves your device
How to use it
No account, no upload — it all happens on your device.
1
Paste a Base64 string or a full data URI into the box.
2
The decoded image appears in the preview with its format and size.
3
Click Download to save it as a real image file.
4
Use Reset to clear and decode another.
When you'll need this
Base64 images turn up in a lot of places.
| Source | Why it's Base64 |
|---|---|
| CSS background | Tiny icons inlined as data URIs to save requests. |
| JSON / API response | Binary images embedded in a text payload. |
| HTML email | Images inlined so they render without hotlinking. |
Base64 and image size
- Base64 is about 33% larger than the raw binary, because it encodes 3 bytes into 4 ASCII characters.
- Great for tiny assets.Inlining a small icon avoids an extra network request; for large images the size penalty usually isn't worth it.
- Round-trips cleanly. Pair this with our Image to Base64 tool to convert in both directions without quality loss.
Frequently asked
Do I need the data: prefix?
No. Paste a full data URI (data:image/png;base64,…) or just the raw Base64 string. When the prefix is missing, the tool detects the format from the decoded bytes and rebuilds the data URI for you.
Which formats are supported?
PNG, JPG, GIF, WebP, BMP, and SVG. The format is read from the data URI's MIME type when present, otherwise it's sniffed from the file's signature bytes.
Is my Base64 uploaded anywhere?
No. Decoding, preview, and download all happen in your browser. The string and the resulting image never leave your device.