JPG to Base64

What the JPG to Base64 tool does

This takes a JPG, the everyday photo format, and turns it into a Base64 string you can drop straight into your code, along with a ready HTML tag and a CSS line that already hold the image. Add your JPG, press Encode, and copy whichever output you need.

It runs in your browser, so the photo stays on your device.

How to use it

1. Add your JPG. Drag it onto the drop area or click to pick the file. You will see a preview.
2. Press Encode. You get the raw Base64, an HTML image tag, and a CSS background line.
3. Copy what you need. Each box has its own Copy button.

What makes JPG a JPG

JPG, also written JPEG, is the format built for photographs. It uses lossy compression, which means it throws away detail your eye is unlikely to miss in order to make the file small. That trade is exactly why a detailed photo full of soft gradients, a sunset, a face, a landscape, can shrink to a fraction of its raw size and still look fine. The flip side is two things worth knowing. JPG has no transparency, so it always fills the whole rectangle with a background, and pushing the compression too hard leaves visible smudges and blocky patches, especially around sharp lines and text. For photos it is excellent. For a crisp logo or an icon with hard edges, PNG is usually the better choice.

The size catch with photos

Here is the honest caution for this one. Base64 makes any image about a third larger, and photos are already the heaviest images you deal with, so a JPG is one of the riskier things to inline. Embedding a big photo as Base64 bloats your HTML or CSS, slows the first paint, and cannot be cached on its own the way a normal file can. So if you are encoding a JPG, it is best kept for a small one, a thumbnail, a tiny avatar, or for a one-off job like an image inside an HTML email or a self-contained report. For a large photo on a normal web page, a regular image file almost always serves you better. There is more on this trade in the main Image to Base64 guide.

How it works

The browser's FileReader reads your JPG and produces a data URI, the data:image/jpeg;base64, string that the HTML and CSS outputs are built around. Base64 is what rewrites the photo's binary data as plain text so it can sit inside your code. The full mechanics are walked through on the Image to Base64 page.

Questions people ask

How do I convert a JPG to Base64?

Add the JPG here and press Encode. You get the Base64 string plus ready-to-paste HTML and CSS, each with the image already embedded.

Does converting to Base64 reduce the photo's quality?

No. Base64 only re-writes the existing file as text, so the photo is unchanged. Any quality loss in a JPG comes from its own compression when it was saved, not from encoding.

Should I inline a large photo this way?

Usually not. Base64 adds about a third to the size, and a large inlined photo bloats your page and cannot be cached on its own. Keep this for small JPGs, or for one-off cases like email and offline documents.

Why does my JPG not keep its transparent background?

Because JPG does not support transparency at all. If you need a see-through background, use a PNG or WebP instead, and the PNG to Base64 tool.

References

1. Masinter, L. (1998). RFC 2397: The "data" URL scheme. Internet Engineering Task Force (IETF). https://www.rfc-editor.org/rfc/rfc2397
2. Josefsson, S. (2006). RFC 4648: The Base16, Base32, and Base64 Data Encodings. Internet Engineering Task Force (IETF). https://www.rfc-editor.org/rfc/rfc4648