Universal image decoder

Base64 Decoder Online – Decode Base64 to Image

Decode Base64 strings, data URLs, embedded code snippets or byte-array text into a detected image preview. Inspect the format, dimensions and file size, then download the result locally.

Input

Paste Base64 Image Data

Auto detect

Paste raw Base64, a data:image URL, byte-array text, or a snippet from HTML, CSS, JSON, SVG, email or JavaScript. FileFlow extracts the image data and detects its format automatically.

Drop a .txt or .json file here. Your image data stays in this browser.

Up to 10 MB
Output

Image preview

Waiting for input
Your decoded image will appear here

Decode Base64 image data to detect the format, preview dimensions and file size before downloading.

Auto-detect format10 image formatsLocal preview
100% Private

All conversions happen locally in your browser.

Super Fast

Instant conversion with zero waiting time.

Secure

Your data never leaves your device.

Developer Friendly

Perfect for developers, designers and testers.

Decoder guide

Decode Base64 image data online

This Base64 decoder turns encoded image data into a visible preview. It is useful for API responses, HTML data URLs, CSS background images, JSON payloads, email templates and copied byte arrays.

Paste a Base64 string, full data URL, or compatible byte array and the tool will detect the image type, show a preview, and allow you to download the decoded file.

How to convert Base64 to image

  1. Paste your Base64 string or data URL into the input field.
  2. Click “Convert String to Image”.
  3. Preview the generated image and download the result.

Common use cases

  • Debug Base64 images from APIs.
  • Test HTML image data URLs.
  • Extract images from JSON payloads.
  • Validate embedded CSS background images.

Base64 decoder vs image converter

This page focuses on decoding and validating pasted Base64, data URLs and byte-array text. Use it to inspect image payloads, confirm the detected MIME type and download the decoded result after previewing it.

Specific image formats

Need a specific output format?

Base64 to PNG

Decode Base64 PNG data for transparent graphics, screenshots, icons and UI assets.

Base64 to JPG

Decode JPG image data for photos, compressed web images and API payloads.

Base64 to JPEG

Decode JPEG data URLs and image payloads while preserving the standard image/jpeg MIME type.

Common questions

Base64 Image FAQ

Is my image uploaded to a server?

No. The conversion runs locally in your browser, so the image data stays on your device.

Can I paste a full data URL?

Yes. You can paste either a plain Base64 string or a value like data:image/png;base64,...

Why does the tool show an error?

The most common reasons are invalid Base64 text, unsupported image data, or a string that was copied only partially.

Which image formats are supported?

JPG, JPEG, PNG, GIF, BMP, TIFF, SVG, WEBP, AVIF, and ICO are supported.

Should I use Base64 images on production websites?

Small icons can be fine, but large images are usually better served as separate optimized files for better caching and page speed.