Image to Base64 turns a picture into text that can be pasted directly into HTML, CSS or JSON. Select an image and copy the result.
What is Base64 for images?
Base64 is a way of writing binary data, such as a picture, using only ordinary text characters. When an image is converted to Base64, it becomes a long string of letters, numbers and a few symbols. That string can be pasted directly into a web page, a style sheet, an email template or a JSON file. This tool converts any image into Base64 right in your browser and lets you copy the result.
Data URI or raw Base64?
A data URI is the Base64 text with a short prefix such as data:image/png;base64, in front. You can use it as the source of an image in HTML, for example in an img tag, or as a background in CSS. Raw Base64 is only the encoded characters without the prefix. It is used in many APIs and configuration files that expect the plain value.
When is it useful?
- Small icons and logos embedded directly in a web page, which removes one network request.
- HTML emails where linked images may be blocked.
- Single-file prototypes that must work without extra image files.
- APIs and JSON that accept images as text.
- Developers testing and debugging image handling.
When you should not use it
Base64 makes data about one third larger than the original file. For big photos this wastes bandwidth, slows page loading and prevents the browser from caching the image separately. As a rule of thumb, use Base64 only for small graphics, usually below ten or twenty kilobytes. For everything else, normal image files are better.
How the tool works
You select an image and the tool reads it in your browser using the standard file reader. The result appears in a text box, and a copy button places it in your clipboard. No upload takes place, which keeps your image private.
How to use the result
In HTML, put the data URI inside the src attribute of an image tag. In CSS, use it inside url() for a background-image. In JSON or an API request, use the raw Base64 string in the field that expects image data. If your editor becomes slow when pasting long text, try a smaller image first.
Tips
- Compress and resize the image first with the Compress Image and Resize Image tools to get a shorter string.
- Prefer PNG or WebP for icons and JPG for photos.
- Test the data URI in a browser before using it in production.
- Keep the original file; Base64 text is difficult to edit.
Troubleshooting
The text is extremely long. The image is large. Reduce its size and convert again.
The picture does not show in my page. Check that the prefix matches the image type and that no spaces or line breaks were added when pasting.
Copy does not work. Click inside the result box, select all and copy manually.
Free and private
Choose an image, pick the output type and copy the result. There is no sign-up, no limit and no upload.
A real-world example
Tariq is building a small HTML email template and wants the company logo to appear even when email clients block external images. He resizes the logo to 120 pixels wide, compresses it and converts it with this tool. He pastes the data URI into the image tag and the logo now travels inside the email itself.
Checklist before you use the result
- The image is small enough, preferably under 20 kilobytes.
- You picked the right output: data URI for HTML and CSS, raw Base64 for APIs.
- You tested the result in a browser before publishing.
- You kept the original image file.
Related tools
Resize Image and Compress Image make the picture small first. Base64 Encode and Decode works with text, and Favicon Generator creates small icons for websites.
More questions about this tool
Does Base64 make the image smaller?
No. Base64 text is about one third larger than the original file. It is useful for convenience, not for saving space.
Can I convert the Base64 text back into an image?
Yes. Paste a data URI into the address bar of a browser to view the picture, or use a decoder in your code to rebuild the file.
How to use Image to Base64
- Select an image.
- Choose a data URI or a raw Base64 string.
- Click "Convert to Base64" and copy the result.
Frequently asked questions
What is a data URI?
It is the Base64 text with a small prefix, so it can be used directly as the source of an image in HTML or CSS.
Is there a size limit?
Large images create very long text. Small icons and logos work best.
Is this tool really free?
Yes. All tools on this website are free to use, with no sign-up needed.
Are my files and data safe?
Yes. Everything is processed inside your own browser. Your files and text are not uploaded to our servers.
Does it work on mobile?
Yes. The tools work on modern phones, tablets and computers.