IMAGE COMPRESSION
Compress JPG — Reduce JPEG File Size Free Online
Compress a JPG online for free. Lower the JPEG quality to cut file size for email, web, and uploads. Runs in your browser — the photo stays private.
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Shrink an image to a target file size
JPG is a lossy photo format, which is exactly why it compresses so well. This tool re-saves your JPEG at a lower quality level, discarding detail your eye barely notices in exchange for a much smaller file — often a fraction of the original. A quality slider puts the tradeoff in your hands, and re-encoding runs on an HTML canvas in your browser, so the photo never leaves your device.
Why JPG shrinks so far — and the catch
JPEG was designed for photographs. It can throw away subtle colour and detail that people don't easily perceive, which is what lets it reach small sizes a lossless format never could. The catch is generational loss: every time a JPEG is saved it's re-encoded and loses a little more, and the artefacts accumulate. Compress from the highest-quality original you have rather than repeatedly re-saving an already-compressed file.
For web and email, a setting in the upper-middle of the quality range usually looks clean while cutting the file substantially. Drop lower only when you need to meet a strict size limit and can accept the softening and blocky patches that heavy compression brings. The preview is your guide — trust your eyes over any specific number.
Frequently asked questions
- Does re-compressing a JPG lose more quality?
- Yes. Each save re-encodes the image and loses a little more detail. If you can, start from the original rather than a file that has already been compressed several times.
- Will the dimensions change?
- No — the width and height stay the same. Compressing only changes how the pixels are encoded, not how many there are. Use a resize tool if you also want fewer pixels.
- Why does JPG compress better than PNG?
- JPEG is lossy and built for photos, so it can discard detail people don't easily see. PNG is lossless and keeps every pixel exactly, so it can't reach the same small sizes on photographic content.
- Is the photo uploaded anywhere?
- No. The JPG is re-encoded on a canvas in your browser and never sent to a server, so it stays on your device the whole time.