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Base64 to Image illustration

Base64 to Image

100% Free

Decode a base64 string or data URL back into a viewable, downloadable image. Auto-detects PNG, JPG, GIF, WebP, BMP, and SVG.

Auto Format Detect
Instant Preview
100% Client-Side
No Upload

Base64 input

Works with or without the data:image/…;base64, prefix. The format is detected automatically from the header or the decoded bytes.

Image preview

Your decoded image will appear here.

Decoding happens entirely in your browser — nothing you paste is uploaded.

Embed This Tool

Easy to Embed

Add Base64 to Image to your website or blog in seconds.

  • Responsive design
  • Lightweight & fast
  • No backend required
  • Always up-to-date 
<iframe
  src="https://tools.town/embed/base64-to-image/"
  width="100%"
  height="600"
  style="border:none; border-radius:12px;"
  loading="lazy"
  title="Base64 to Image">
</iframe>

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Share Base64 to Image with anyone — no login required.

  • Shareable link
  • No login required
  • Works on any device
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How to Use

  1. 1 Copy the base64 string or data URL you want to turn back into an image
  2. 2 Paste it into the input box — with or without the data:image/…;base64, prefix
  3. 3 The tool decodes it instantly and shows a live preview on the right
  4. 4 Check the detected format, file size, and base64 length
  5. 5 Click Download image to save the file, or Copy data URL to reuse it

Features

  • Auto-detects PNG, JPEG, GIF, WebP, BMP, and SVG from the header or magic bytes
  • Live image preview on a checkerboard so transparency is visible
  • One-click download with the correct file extension
  • Accepts raw base64 or a full data: URL, and tolerates line breaks and URL-safe characters
  • Reports decoded byte size and base64 character count
  • Runs 100% in your browser — pasted data is never uploaded

Why it Matters

Base64-encoded images show up everywhere — inside CSS, JSON API responses, HTML email, and SVG files — but you can't see them until they're decoded. This tool turns that wall of text back into a real, viewable image you can download, so you can verify an asset, extract an icon, or debug a data URL without writing any code.

★★★★★

Use Cases

Debug Data URLs

Paste a data: URL from CSS or HTML to confirm the embedded image is correct

Extract Embedded Assets

Pull an icon or logo out of a JSON payload or stylesheet and save it as a file

Quick Verification

Check that a base64 string a teammate sent really is the image they meant

Private by Default

Decode sensitive or internal images without uploading them to a server

What this tool does

The Base64 to Image decoder turns a base64 string — or a full data:image/…;base64,… URL — back into a real image you can see and download. Paste the text, and it renders a live preview, identifies the format, and gives you a one-click download with the right file extension.

It accepts input with or without the data: prefix, tolerates line breaks and URL-safe base64, and detects the format from either the data-URL header or the decoded file’s magic bytes.

When you’ll reach for it

Base64 images turn up inside CSS background rules, JSON API responses, HTML emails, and SVG files. They’re convenient for machines but impossible to read at a glance. This tool is the quickest way to confirm what an encoded string actually contains, extract an embedded asset, or debug a broken data URL.

Privacy

Everything runs in your browser via the pure decodeBase64Image function. Nothing you paste is uploaded, logged, or stored — you can verify this in your browser’s Network tab.

Frequently Asked Questions

Do I need to include the data:image prefix?
No. The tool works with a full data URL (data:image/png;base64,iVBOR…) or with just the raw base64 payload. If the prefix is present it uses the declared MIME type; if not, it detects the format from the decoded bytes.
Which image formats are supported?
PNG, JPEG, GIF, WebP, and BMP are detected from their magic bytes, and SVG is detected from its XML markup. If the data decodes cleanly but isn't a recognised image, you can still download the raw file.
Is my image uploaded anywhere?
No. Decoding happens entirely in your browser using the built-in atob function via the pure decodeBase64Image module. Nothing you paste leaves your device — you can confirm this in your browser's Network tab.
Why does my paste show an error?
The most common causes are stray characters (quotes, commas, or HTML around the string) or a truncated payload. Make sure you copied the complete base64 text. The tool tolerates line breaks and URL-safe characters automatically.
What's the largest image I can decode?
There's no hard limit, but very large strings (many megabytes) depend on your device's memory since everything runs locally. For typical icons, screenshots, and photos it's instant.
📖

Want to understand the math?

Browse all guides →
Base64 Images and Data URLs Ex
base64

Base64 Images and Data URLs Explained

What base64 image encoding is, how data URLs work, when to embed images as base64, and how to decode a base64 string back into a real image file.

23 Jun 2026

5 min read

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