Drop an image here
or click to choose · PNG, JPG, WebP, GIF
Choose imageAbout the Image to Base64
Drop any image and get its Base64 encoding instantly, in three ready-to-paste flavours: a complete data URI for img tags, the raw Base64 string for APIs and payloads, and a CSS background-image rule you can drop straight into a stylesheet. A live preview and size readout show exactly what you're embedding before you copy it, so oversized assets never sneak into your codebase unnoticed.
Base64-encoding an image lets you inline it directly in HTML, CSS, JSON or an email template — no separate file, no extra HTTP request. The conversion happens entirely on your device using the browser's own FileReader, so the image is never uploaded anywhere. That matters when you're encoding logos, mockups or anything under NDA: what you drop on the page stays on your machine.
Features
- Copy the full data URI, raw Base64 or CSS snippet
- Live preview of the exact image being encoded
- Shows the encoded size before you copy
- Works with PNG, JPG, WebP, GIF and SVG
- Encoded locally with FileReader — nothing is uploaded
- Free, instant and no account required
How to convert an image to Base64 online
- Drag your image onto the tool or click to pick a file.
- Check the preview and the encoded size shown below it.
- Click Copy data URI for use in img tags or JSON.
- Or copy the raw Base64 string or the CSS background-image snippet.
- Paste the result into your code, stylesheet or API request.
Frequently asked questions
What is a Base64 data URI?
A data URI packs a file's contents into a text string, prefixed with its MIME type — for example data:image/png;base64,iVBOR… . Browsers render it exactly like a normal image URL, so you can embed pictures directly in HTML, CSS or Markdown without hosting a separate file.
Does Base64 encoding reduce image quality?
No. Base64 is a lossless text representation of the exact bytes in your file — decoding it returns a pixel-perfect copy of the original. The trade-off is size rather than quality: because binary data is spelled out in text characters, the encoded string is roughly 33% larger than the original file.
When should I embed an image as Base64?
It shines for small assets: icons, logos, tiny backgrounds, email signatures and single-file HTML documents, where saving an HTTP request outweighs the size overhead. For large photos, a normal image file is usually the better choice because Base64 bloats the markup and can't be cached separately.
Is there a file size limit?
There's no hard cap — the encoding runs in your browser's memory, so typical icons, logos and photos convert instantly. Multi-megabyte files work too, but the resulting string becomes unwieldy to paste into code and slow for editors to handle, which is a practical limit rather than a technical one.
Is my image uploaded to a server?
No. The file is read and encoded entirely on your device using the browser's FileReader API — no network request is made with your image data. You can even load the page, disconnect from the internet and the conversion still works.