Encode Images to Base64 Data URIs

Convert an image to a Base64 data URI in your browser. Copy the raw string, the ...

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Quick answer

To convert an image to Base64, upload it and YaliKit reads the file with the browser's FileReader and encodes it as a Base64 data URI like data:image/png;base64,iVBORw0KGgo. You get the raw Base64 string, the full data URI, and ready-to-paste CSS, HTML, and Markdown snippets, each with its own copy button. Everything runs in your browser with no upload, and the Base64 text is about 33 percent larger than the original file, which is normal for this encoding.

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Features

Snippets - CSS, HTML, MD
Prefix Toggle - Raw or data URI
Size and Length - Bytes and chars
Private - No upload
One-Click Copy - Every field
Free - No limits

Why Use Encode Images to Base64 Data URIs?

Copy-Ready Snippets

Beyond the raw Base64 and data URI, you get finished CSS background-image, HTML img, and Markdown snippets. Each has its own copy button so you paste the exact line your code needs.

Real Mime Preserved

Encoding uses FileReader.readAsDataURL, so the data URI keeps the file's true type. A PNG becomes data:image/png, a JPG data:image/jpeg, and an SVG data:image/svg+xml, all correctly.

Prefix On or Off

One toggle switches the main output between the full data:...;base64, URI and the raw Base64 payload alone, so you copy exactly the form your target expects.

Size and Length Readout

See the file name, detected format, original byte size, pixel dimensions, and the Base64 character length, plus the roughly 33 percent size increase that Base64 always adds.

Nothing Uploaded

Your image is read and encoded entirely in your browser. It never travels to a server, and the tool keeps working offline once the page has loaded.

Drop, Click, or Paste

Add an image by dragging it onto the page, clicking to browse, or pasting from the clipboard. The encoded output appears the moment the file is read.

Common Uses

CSS Backgrounds

Embed a small icon or pattern as a Base64 background-image with no extra request.

HTML Emails

Inline a logo or graphic as a data URI so it shows without loading from a server.

Config and JSON

Store an image as text inside a JSON config, database field, or localStorage.

Single Page Apps

Inline tiny images directly in your bundle to cut HTTP requests on first paint.

How It Works

1

Add Your Image

Drag and drop an image, click to browse, or paste one from the clipboard. PNG, JPG, GIF, WebP, BMP, and SVG all work.

2

Choose the Output Form

Keep the full data URI for HTML and CSS, or flip the toggle to the raw Base64 payload when your target wants the encoded data on its own.

3

Copy the Snippet You Need

Copy the raw string, the data URI, or a ready-made CSS, HTML, or Markdown snippet. You can also download the output as a .txt file.

Pro Tips

Keep Base64 for Small Images

Inlining works best under about 10KB. Larger images bloat your HTML or CSS by roughly a third and cannot be cached on their own, so a normal file URL is usually faster.

Use the Data URI for the Web

For HTML img tags, CSS, and Markdown keep the prefix on. The data:image/...;base64, header is what tells the browser how to decode and render the image.

Drop the Prefix for Payload-Only Targets

Some APIs and database columns want just the encoded bytes. Flip the toggle to raw Base64 so you do not accidentally store the data: header along with the data.

Frequently Asked Questions

Add your image by dragging it in, browsing, or pasting from the clipboard. The tool reads the file with the browser's FileReader and encodes it as a Base64 data URI right away. You then copy the raw Base64, the full data URI, or a ready CSS, HTML, or Markdown snippet. Nothing is uploaded, since the encoding happens in your browser.
Use the data URI as a background image, for example background-image: url("data:image/png;base64,iVBOR..."). This tool gives you that exact CSS line with a copy button, so you paste it straight into your stylesheet with no separate image file needed.
Put the full data URI in an img src, for example <img src="data:image/png;base64,iVBOR..." alt="image" />. The tool builds that complete img tag for you, using the file's real mime type, so the image renders inline without an external request.
For HTML img tags, CSS, and Markdown you want the full data URI including the prefix, because the browser needs the mime type to render the image. For places that store only the encoded payload, such as some APIs or database columns, switch the toggle to raw Base64 to drop the prefix.
Base64 represents every three bytes of binary data as four text characters, so the encoded text is about 33 percent larger than the original file. This is normal and expected. The tool shows both the original byte size and the Base64 length so you can see the difference.
Any image your browser can read: PNG, JPG, GIF, WebP, BMP, and SVG are all supported, and the data URI keeps each format's correct mime type. So a PNG to Base64, a JPG to Base64, or an SVG to Base64 all just work through the same upload.
Yes. The image is read and encoded locally with your browser's FileReader, so the file and the resulting Base64 never leave your device. You can disconnect from the internet after the page loads and it still encodes.
Base64 is best for small images such as icons, logos, or email graphics. For large or frequently used images, a normal file URL is usually better, because Base64 adds about 33 percent in size and the browser cannot cache an inline image separately from the page.

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