Base64 Image Encoder & Decoder
Convert images to Base64 strings for CSS/HTML embedding or decode Base64 strings to pure image files without uploading to a server
Safe conversion with no data sent to server
Drag & drop image
or click to browse local files
What is Base64 Encoding?
Base64 is a way of representing binary data using an ASCII string format. When applied to images, Base64 conversion takes an image file (like .png or .jpg) and translates it into a long string of letters, numbers, and symbols. That string can then be placed directly into an HTML document's <img src=""> tag or a CSS background-image declaration.
When to Use Base64 Images (and When Not To)
Because Base64 embeds the image directly into HTML/CSS files, it eliminates a separate HTTP request, which can dramatically speed up initial loading for tiny graphics (like icons). However, encoding an image increases its size by roughly 33%. For large photos, embedding them in Base64 heavily bloats the document and negatively impacts performance.
How to Decode Base64 Output?
Sometimes you need to inspect an unfamiliar data URL found inside a style sheet or JSON file. By pasting your Base64 text into our Decode mode, the tool infers the original Magic Bytes (MIME Type) on the client side perfectly restoring the image and presenting a one-click download.