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Image to Base64 Converter

Turn any image into a Base64 data string you can paste straight into HTML, CSS or JSON. This free image to Base64 converter encodes your file locally in your browser, so your image never leaves your device.

Choose an image

What is an image to Base64 converter?

An image to Base64 converter reads an image file and re-encodes it as a Base64 string. Base64 is a text encoding that represents binary data, so an entire image becomes a single line of text starting with data:image/png;base64, ... — called a data URL. Data URLs are handy because they embed an image directly into a document, so you no longer need a separate image file, an upload, or a server. You use them to mark up a single HTML src attribute, set a CSS background, store a tiny icon in a database, or send an image inside a JSON payload. This tool reads your file with the browser FileReader API and produces a data URL plus its size in kilobytes, so you can copy it to your clipboard or download it as a .txt file. Because the encoding happens on your own device, your image is never uploaded to any server.

How to use

Choose an image from your device.
The Base64 data URL is generated automatically.
Copy it to your clipboard or download it as a .txt file.

Example

Choose a small logo.png of 12 KB. The tool returns a data URL that starts with data:image/png;base64,iVBORw0KGgo..., about 16 KB as text, which you copy and drop into an img src attribute.

Common use cases

Embedding a small logo or icon directly in an HTML email or page.
Setting a CSS background-image on a card or banner without a file.
Storing a thumbnail as text in a database or JSON API response.
Sending a tiny image inside a request payload where a separate file is awkward.

Pro tips

Keep the source image small — Base64 adds roughly 33% to the size, so large photos become huge strings.
Copy the Base64 string, not the file, when you need it inline in code.
Use the Download .txt button to save the string for pasting later.
For sharing a real image file, use a regular image URL instead; data URLs are best for small embedded assets.

FAQ

What is a Base64 data URL?

A text string that encodes the entire image, starting with data:image/..., so the image can be embedded directly in HTML, CSS or JSON without a separate file.

Is it free and private?

Yes. It is free, unlimited, and runs entirely in your browser so your images never leave your device.

What do I do with the Base64 string?

Paste it into an HTML src or CSS background attribute, or store it in a database. It works anywhere a data URL is accepted.

Does Base64 make files bigger?

Yes — Base64 expands a file by roughly 33%, so it is best for small images like icons and logos.

Which image formats are supported?

Any image type the browser can read — PNG, JPEG, WebP, GIF, SVG and more.

Can I download the result?

Yes — use the Download .txt button to save the Base64 string as a text file.

Is there a size limit?

There is no hard limit, but very large images create very long strings that are slow to load and copy.

How is this different from a regular image file?

A data URL embeds the image as text, so it travels inside the document, whereas a regular image is a separate file the browser loads by URL.

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More FAQs

Are these image tools free and unlimited?

Yes, free and unlimited with no watermark or signup.

Are my images uploaded to any server?

No. Conversion runs locally in your browser, so your images never leave your device.