Calculator
What the Image to Base64 does
Image to Base64: encode an image to Base64 / Data URI with CSS, Markdown, and JSON tabs. Everything runs in your browser and the file is never uploaded.
Drop in a file and the Image to Base64 handles it locally. The work happens inside your browser tab, so there is no upload to wait for and no queue.
Oversized images are the most common reason a page feels slow. That is usually what brings anyone shrinking a photo before uploading it here.
There is no account, no upload and no server round trip, because the page does the work itself.
How to use it, the method behind it, and common questions about this image tool are covered further down.
What do the Image to Base64 fields mean?
The Image to Base64 uses 1 input. Because the form arrives filled, the first useful result costs you zero typing.
| Field | What to enter | Default |
|---|---|---|
| Image file | stays on your device | none |
How does the Image to Base64 work?
The conversion is produced in one pass over your input.
Bad input produces a message, not a silently incorrect figure.
What a typical run looks like
You provide: Image file
What happens: the file is read into memory by your browser, processed locally, and offered back as a download. It is never uploaded.
You get back: a new file plus a brief account of what happened to it, shown in the panel.
How long this takes is a property of your computer, not of our infrastructure, and file size is bounded by browser memory.
Read next: Why We Run Everything in Your Browser
How to use it
- Choose your file under Image file, or drag it onto the drop area.
- Press Convert.
- Check Status on the right.
- Use Copy Link if you want the same setup again later, or Print for a paper copy.
What this tool does not do
- Re-encoding a lossy format such as JPEG always loses some detail, even at maximum quality.
- EXIF metadata may be dropped during processing, which is usually desirable but worth knowing.
- There is no history: reload the page and the previous run is gone.
- Large files are limited by your available memory, not by an upload quota.
Frequently asked questions
The form asks for Image file. Each field is pre-filled with a sensible default, so you can change one value at a time and watch how the result responds.
No upload takes place. The file is handled entirely in the browser and discarded when you close the tab.
Free for any use, personal or commercial.
As accurate as the inputs allow. The arithmetic itself introduces no error beyond display rounding.