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  3. Base64 to image converter

Base64 to image converter

Decode a Base64 string or data URI into a viewable, downloadable image – or encode a picture to Base64 for HTML, CSS, JSON or email.

Drop an image here

or click to choose one

Encoding and decoding happen in this tab. Nothing is sent anywhere.

Decode and encode Base64 images

Two tools on one page. Base64 → image takes a string you found in an API response, a database, an email source or a web page and shows the picture, with its format and dimensions, ready to download. Image → Base64 does the reverse: pick an image and copy the text to paste into HTML (<img src="data:…">), a CSS background-image, a JSON payload or a test fixture.

How to convert Base64 to an image

  1. Open the “Base64 → image” tab. Paste the text. A full data URI or bare Base64 both work.
  2. Click “Show image”. The picture appears with its format, size in pixels and file size.
  3. Download. The file is saved with the correct extension: PNG, JPG, GIF, WebP, BMP, SVG or ICO.

When Base64 images make sense

Good use
Small icons and logos inside HTML emails, single-file HTML pages, CSS sprites, JSON APIs that cannot carry binary files, test data.
Poor use
Photos and large images on web pages – they add a third to the size, cannot be cached separately and delay rendering. Link to a normal file instead, compressed with reduce image size in KB.

Frequently asked questions

What is a Base64 image?

It is an image file written out as plain text using 64 safe characters, so it can be placed directly inside HTML, CSS, JSON or an email. A data URI adds a prefix like data:image/png;base64, that tells the browser the format.

Why is the Base64 text bigger than the image?

Base64 uses 4 characters for every 3 bytes, so it is about 33 % larger than the original file. Use it for small images such as icons; link to normal files for photos.

My Base64 won’t decode – why?

Usually part of the string is missing, or it contains line breaks, quotes or a stray character from copying. The tool ignores spaces and line breaks and accepts URL-safe Base64 (- and _), but the string must be complete.

How does the tool know the image format?

From the data:image/… prefix if present; otherwise from the first characters of the data, which identify PNG, JPEG, GIF, WebP, BMP, SVG and ICO.

Is my data sent anywhere?

No. Everything runs in your browser.