Free Image to Base64 Converter

How to convert an image to Base64

1. Add your image. Drag a file onto the box above, click Choose image, or paste an image straight from your clipboard.
2. Copy the result. The converter instantly shows the full data URI plus ready-made HTML and CSS snippets. Hit Copy on whichever one you need.
3. Paste it into your code. Drop the data URI into an <img> tag, a CSS background, a JSON payload, or anywhere a string belongs.

What is a Base64 image / data URI?

A computer image is binary data. Base64 re-expresses that binary as plain text using 64 safe characters (A–Z, a–z, 0–9, + and /). When you prepend a small header like data:image/…;base64, you get a data URI — a self-contained string that a browser treats exactly like a normal image URL, except the picture is baked right into the text. People search for the same operation under several names: image to Base64, base64 encode image, image base64, encode image to Base64, and convert image to Base64 online all mean the same forward step — a file goes in, a string comes out.

Need only the data URI for CSS or HTML? Use the data URI generator.

Image to Base64 vs Base64 to image

These are opposite directions and are easy to mix up. Image to Base64 (this page) encodes a file into text so you can embed it. Base64 to image decodes a string back into a downloadable file. If you have a string and need a file, open the Base64 to Image decoder; if you have a file and need a string, stay here.

What the output looks like

A raw Base64 string contains only encoded image data — it often begins with a format signature such as iVBORw0KGgo. A data URI adds the MIME-type prefix data:image/…;base64, before that string. Browsers need the prefix when the result is placed directly in an image source or CSS rule; APIs and databases sometimes want only the raw body. Use the format the destination requires rather than stripping the prefix by guesswork.

When embedding an image as Base64 is worth it

• Tiny, frequently-used assets — icons, logos, spinners. Inlining them removes an extra HTTP request.
• Single-file deliverables — an email template, a self-contained HTML report, or a snippet you paste into a CMS where you can't upload files.
• Quick prototyping — you need an image in a CodePen, a JSON mock, or a test fixture without hosting it anywhere.
• Text-only storage — a system that accepts strings but cannot receive a separate binary upload.

When a normal image file is better

Keep large screenshots, photos and hero graphics as regular files. An inline image cannot be cached independently from the HTML or CSS that contains it, and reusing the same long data URI across several pages repeats bytes that a separately hosted file could download once. Normal files are usually better for responsive images, lazy loading, CDN resizing and content that changes often.

Example: using the data URI

<!-- HTML -->
<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUg..." alt="logo" />

/* CSS */
.logo { background-image: url(PASTE_DATA_URI_HERE); }

A note on size

Base64 makes data roughly 33% larger than the original file (4 text characters per 3 bytes). HTTP compression may shrink the transfer difference when the string is embedded in a compressed HTML or CSS file, but it does not restore independent caching. Use Base64 where the convenience of "everything in one string" outweighs the extra bytes.

Privacy

This tool encodes images locally with the browser's FileReader API. There is no upload step and no server — you can confirm it in your browser's Network tab. That makes it safe for screenshots, internal diagrams, or anything you'd rather not send to a third-party site.

Security note for Base64 images

Base64 is an encoding, not encryption. Anyone who receives the string can decode the original image. Treat the output with the same care as the source file, and do not use encoding as a way to hide confidential content. If you accept Base64 from other users in an application, validate the declared MIME type, decoded size and file signature before storing or displaying it.

Converting from code instead of the browser? See how to convert an image to Base64 in JavaScript, Python, PHP, Java and more. Not every Base64 tool works this way. Curious how the different kinds compare? Read our guide to online vs. in-browser Base64 converters, or see how Image2Base64 compares with the alternatives.