Decode Base64 to Image Decode Base64 data URIs back to viewable and downloadable images.

What Is Base64 Image Decoder?

This tool converts Base64-encoded image data back into a viewable and downloadable image. It accepts both raw encoded strings and complete data URIs (data:image/type;base64,...). The tool renders a live preview and provides a download option via a dynamically created Blob. Supports all image formats including PNG, JPEG, GIF, WebP, and SVG. Useful for debugging embedded images in HTML, CSS, APIs, and email templates. All processing happens in your browser — no data is transmitted to any server.

Why Use Base64 Image Decoder?

• Instant visual preview of Base64-encoded images
• Download decoded images in their original format
• Accepts both raw Base64 and complete data URIs
• 100% client-side — no data ever leaves your browser

Common Use Cases

Debug Data URIs

Visually inspect Base64-encoded images from HTML, CSS, or API responses.

Extract Embedded Images

Convert inline Base64 images back to downloadable files.

Email Debugging

Preview Base64-encoded images from HTML email templates.

API Development

Decode and inspect Base64 image payloads from REST API responses.

Technical Guide

The decoder strips the data URI prefix if present, validates the Base64 string, and renders it as an img src. For download, it converts the Base64 to a binary Blob using atob() and Uint8Array, then creates an Object URL via URL.createObjectURL(). MIME type is extracted from the data URI prefix or defaults to image/png. The tool validates the Base64 alphabet and checks for common issues like missing padding or invalid characters.

Tips & Best Practices

• 1
  Paste the complete data URI including the data:image/... prefix for best results
• 2
  If no MIME type prefix is included, the tool defaults to image/png
• 3
  Use this to verify Base64 images before embedding them in production code
• 4
  Large Base64 strings may take a moment to render — this is normal

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Frequently Asked Questions

Q Is this tool free?

Yes, completely free with no signup required.

Q Is my data secure?

Yes. All decoding happens 100% client-side in your browser.

Q What image formats can it decode?

Any format supported by your browser: PNG, JPEG, GIF, WebP, SVG, and more.

Q Can I download the decoded image?

Yes, click the Download button to save the image file.

Q Does it work on mobile?

Yes, with responsive design and touch-friendly controls.

About This Tool

Base64 Image Decoder is a free online tool by FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration or installation required.