Base64 to Image — Free Online Image Decoder
Decode a Base64 string back into an image and preview, download, or copy it instantly. Supports PNG, JPG, GIF, WebP, SVG, and BMP. Runs entirely in your browser.
How to Use the Base64 to Image Decoder
- Paste Base64 — copy a Base64 string (with or without the
data:image/...;base64,prefix) into the input box. - Load options — click Load Sample to try a demo, or Load from .txt to import a saved string.
- Decode — press Decode Image and the tool renders the picture in the preview area.
- Check info — view the detected image format and the decoded byte size.
- Download — save the image to your device as a PNG, JPG, or its original format.
- Copy — grab the original Base64 string back to your clipboard if needed.
- Clear — reset the tool to start a new decode.
Why Use This Base64 to Image Decoder
Base64 is widely used to embed binary images inside text-based formats such as HTML, CSS, JSON, XML, and email. When you receive a Base64 string from an API, a database, or a colleague, this tool lets you convert it back into a real image in seconds — no software installation, no upload to a server.
Everything runs locally in your browser using the native FileReader and Blob APIs. Your data never leaves your device, so it is safe to decode sensitive or private images. The decoder automatically detects the MIME type from the data URI prefix or the decoded bytes, so you always get the correct file format.
Frequently Asked Questions
No. The tool accepts both full data URIs (data:image/png;base64,iVBOR...) and raw Base64 strings. If you paste raw Base64 without a prefix, the decoder detects the format from the file signature and defaults to PNG when unsure.
The decoder supports PNG, JPEG, GIF, WebP, SVG, and BMP. The format is detected automatically from the data URI prefix or the decoded file header, so you do not need to specify it manually.
No. All decoding happens locally in your browser. The Base64 string is converted into an image using client-side JavaScript and is never sent anywhere. Your images stay private on your device.
Decoding fails when the string contains whitespace, line breaks, or invalid characters outside the Base64 alphabet (A-Z, a-z, 0-9, +, /, =). The tool strips common whitespace automatically, but if the string is truncated or corrupted the image cannot be reconstructed.
Use Cases
Previewing API Image Payloads
Decode Base64 images returned inside JSON API responses to verify they render correctly.
Recovering Embedded Email Images
Turn Base64-encoded attachments from HTML emails back into downloadable image files.
Extracting Database-Stored Images
Convert Base64 blobs stored in databases into real files for backups or migration.
Converting Data URIs to Files
Save inline CSS or HTML data URIs as standalone image files for reuse.
Verifying Encoded Assets
Check that a Base64 string produced by another tool actually contains the expected image.