JPG compressor.

JPEG keeps the detail the eye notices and drops what it does not: fine color variation first, then fine texture. At 70 to 90 the loss is invisible on a screen. Lower and blocks, banding and halos appear around edges and in smooth areas.

70 to 80 for the web: a big saving and no visible change. 85 to 95 for printing, where the detail is worth the bytes. 50 to 60 for thumbnails and previews, where nobody looks closely.

Nothing. They are one format, defined by the Joint Photographic Experts Group in 1992. The three-letter extension dates from Windows systems that allowed no more, and every tool here takes both spellings.

Every save throws away a little more detail: that is generation loss. Keep the original and make each compressed version from it rather than recompressing a compressed file. Converting to PNG stops the loss but cannot bring back what an earlier save dropped.

The file was already well compressed, or you asked for PNG, which is lossless and larger for a photo. In the first case the tool keeps your original and tells you; in the second, choose JPEG or WebP for a photograph.

The slider sets the starting quality, and a size cap makes the tool try lower qualities until the file fits under it. The longest-side cap scales the image down first, which is the biggest lever for a photo straight from a camera. Every change reruns the compression and shows the new size.

Then there was nothing to gain: the file was already smaller than any recompression at these settings. The tool keeps your original, says so under the result, and never hands you a bigger file than the one you dropped.

No. The file is decoded, drawn and re-encoded by your browser's canvas, and the page makes no request with it. You can load the page, go offline and keep working; nothing is stored either.

No. The JPG compressor is free and opens without a sign-in, an account or an install.

Up to 100 MB per file, the limit the tool states under its drop area. A larger file is refused with a plain message instead of being decoded.

No, it takes one file at a time. If you drop or choose several, only the first is used; run the tool again for the next one.

By default, yes. The Keep EXIF switch is off; turn it on to carry the original's EXIF into the result (for JPEG output only in the JPG tool).

When the output would not be smaller and you kept the same format, the tool hands back your original and says so in the status line.

Closest to the JPG compressor: PNG compressor, JPG to WebP converter, Reduce a JPG's file size, Optimize a JPG for the web. Each opens on its own page, free and in the browser.

The JPG compressor is one of 44 in its group. The group's page, /tools/jpg, lists them all.

The tool is free. Its interface is built from shadcn.io's own components (Button, Input, Slider and the rest of the registry under /ui), which come in React, Vue, Svelte and Solid. Pro adds the blocks and templates for the product around it.