Image to Base64 Converter

How to convert an image to Base64

An image file is binary data. Base64 rewrites those bytes as text using 64 safe characters (A–Z, a–z, 0–9, + and /). Add a small header like data:image/png;base64, and you get a data URI — a self-contained string the browser treats exactly like a normal image URL, except the picture is baked into the text. People search for this 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.

1. Add your image. Drag a file onto the converter, click Choose image, or paste it from your clipboard.
2. Copy the result. The page 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.

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 image Base64 output looks like

A raw Base64 string contains only encoded image data — for a PNG it commonly begins with iVBORw0KGgo, the Base64 signature of the PNG header. A data URI adds the MIME-type prefix data:image/png;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.

<!-- HTML -->
<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUg..." alt="logo" width="32" height="32" />

/* CSS */
.logo { background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUg...); }

When to inline an image as Base64

• Small interface assets: an icon, badge, spinner or logo where removing an extra request helps.
• Single-file deliverables: an email template, self-contained HTML report, or a CMS field that rejects file uploads.
• Prototypes and test fixtures: a CodePen, JSON mock, or demo that needs an image without hosting it.
• Text-only storage: a system that accepts strings but cannot receive a separate binary upload.

Inline only when portability or fewer requests is worth the extra bytes. For a normal production site, an optimized image file is usually easier to cache, replace and deliver through a CDN.

When a normal image file is better

Keep large screenshots, photos and hero graphics as regular files. Base64 adds roughly one third to the binary size, and an inline image cannot be cached independently from the HTML or CSS that contains it. Reusing the same long data URI across several pages repeats bytes that a separately hosted image could download once. Normal files are usually better for responsive images, lazy loading, CDN resizing and content that changes often.

Why Base64 output is larger

Base64 represents every three input bytes with four text characters, so the encoded body is about 33% larger than the original image. HTTP compression may shrink the transfer difference when the string is embedded in a compressed HTML or CSS file, but it does not remove the browser's decode work or restore independent caching. Compare the final compressed page size rather than assuming every inline image improves performance.

Private, browser-only conversion

The converter uses the browser's FileReader API. Your image is read on the current device and the result is written into the output fields; the file is not uploaded to this site. That makes the tool suitable for internal screenshots and design assets, although you should still avoid pasting a sensitive result into third-party forms, public issue trackers or source code that will be published.

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.