Compress Image Online – Free Image Size Reducer
Reduce JPG, PNG and WebP file size directly in your browser while choosing the balance between quality and compression.
Click to upload or drag an image here
Processed entirely in your browser
Compressor reduces an image's file size while letting you control the quality tradeoff, entirely in your browser, useful anywhere file size matters more than pixel-perfect quality.
How does compressing an image actually make the file smaller without changing its dimensions?
It reduces the amount of data used to store the same pixel grid, mainly by simplifying subtle color and detail variations that are hard for the human eye to notice anyway — a process that discards some genuine image information (a "lossy" tradeoff) in exchange for a substantially smaller file at the same pixel dimensions. Higher compression trades away more of that fine detail for a smaller file; lower compression keeps more detail at a larger file size, which is exactly why this tool lets you choose the balance rather than applying one fixed setting.
Why does a JPEG compress so much smaller than a PNG of the same photo?
JPEG is specifically built for photos and other continuous-tone images and uses lossy compression, deliberately discarding detail the eye is unlikely to miss to reach a much smaller file. PNG uses lossless compression instead, preserving every pixel exactly — a real advantage for graphics, logos and screenshots with sharp edges and flat colors, but a much less efficient choice for a photo, since it can't discard the fine tonal detail a JPEG happily trades away.
Is this actually private, and does it work for JPG, PNG and WebP?
Yes to both — compression happens entirely in your browser, so the image is never uploaded to a server, and it supports JPG, PNG and WebP, letting you compress whichever format your original file already uses rather than forcing a conversion first.
Who actually decided how much image quality was acceptable to throw away?
A committee that spent six years arguing about exactly that question. The Joint Photographic Experts Group formed in 1986 as a collaboration between two international standards bodies, tasked with designing a compression method that could shrink a photograph dramatically while keeping it looking essentially unchanged to a human viewer. The resulting standard, published in September 1992 and still called JPEG today, routinely discards around 90% of a photo's raw data — an almost unbelievable number on paper, but one the committee calibrated carefully against how much detail loss human vision actually notices in a natural photograph. More than three decades later, that same six-years-in-the-making tradeoff between file size and visible quality is exactly what a slider on an image compressor is letting you fine-tune by hand.
Is Compressor free to use?
Yes. Compressor is completely free, with no sign-up and no usage limits.
Do I need to install any software?
No. Compressor runs directly in your web browser — nothing to download or install.
Is my data kept private?
Everything happens on your device. We never receive or store the file or text you enter into Compressor.