DinoConvert › Image to Base64
Convert an Image to Base64 (Data URI) - Free & Local
Need to embed a small icon in your HTML or CSS, or send an image inside a JSON payload? Drop your file and get the Base64 string, with or without the data:image/png;base64, prefix. The file is read in your browser and never uploaded.
How to convert an image to Base64
- Open the DinoConvert Base64 tool on the File → Base64 tab.
- Drop your image (any file up to 15 MB works).
- Keep “Include data URI prefix” checked for HTML/CSS, or uncheck it for a raw string (APIs, JSON).
- Press Copy to clipboard, or download it as a .txt file.
- Paste it where you need it.
How to use a Base64 image in HTML and CSS
With the prefix included, paste the result straight into an <img src="…"> or a CSS background: url(…). The browser displays the image without an extra network request.
When Base64 is a good idea, and when it is not
- Good: tiny icons, favicons, email templates, single-file demos, JSON APIs.
- Avoid: large photos. Base64 makes data about a third bigger and cannot be cached separately from the page.
Raw Base64 or data URI?
A data URI contains the MIME type and works directly in a browser. A raw Base64 string is what most APIs expect, with the type declared separately.
Data URI vs raw Base64
| Data URI | Raw Base64 | |
|---|---|---|
| Looks like | data:image/png;base64,iVBOR… | iVBOR… |
| Use in HTML / CSS | Yes, directly | No, needs a prefix |
| Use in JSON APIs | Sometimes | Usually |
Frequently asked questions
How do I convert PNG to Base64?
Drop the PNG in the encoder and copy the result.
Can I convert SVG to Base64?
Yes. Any file type is accepted, SVG included.
What is the file size limit?
15 MB per file.
Is my image uploaded?
No. Encoding is done locally in your browser.
Why is the Base64 string bigger than my file?
Base64 adds roughly 33% overhead.
Can I decode a Base64 image back to a file?
Yes, use the decode tab.
Get your Base64 string in one click
No upload, no account, no watermark. Your files never leave your device.
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