It makes image files smaller. Drop in one or more photos or graphics and it re-encodes them at a lower quality (and, optionally, a smaller size), so a multi-megabyte photo can drop to a few hundred kilobytes — handy for email attachments, faster web pages, or fitting an upload limit.
How do I use it?
Drag images onto the drop zone, or click it to browse. You can add several at once.
Each image is compressed automatically and shows its old size, new size, and how much was saved.
Adjust the Quality slider, Output format, or Max width — every image re-compresses instantly.
Click Download on a single image, or Download all to save them together.
Which formats can it read and write?
It reads anything your browser can decode — JPG, PNG, WebP, GIF, and BMP. It can write JPEG, WebP, or PNG. Leaving the format on "Keep original" re-encodes JPG/PNG/WebP in place and converts anything else to JPEG.
Quality & size
What does the Quality slider do?
For JPEG and WebP it sets how aggressively detail is discarded — lower quality means a smaller file but more visible artifacts. 80% is a good default that's usually indistinguishable from the original. PNG is lossless, so the slider doesn't affect PNG output.
Which format should I pick?
JPEG is best for photographs. WebP usually gives the smallest file at the same quality and is supported by all modern browsers. PNG is lossless and best for screenshots, logos, or anything with sharp edges or transparency — but files stay larger.
What is "Max width" for?
It scales the image down so its width never exceeds the number you enter (height scales to match). A 4000-pixel phone photo resized to 1600px is dramatically smaller and still sharp on screen. Leave it blank to keep the original dimensions.
Why did my file get bigger?
Re-encoding an already-optimized image, or turning a small JPEG into PNG, can increase size — the tool shows a red +% when that happens. Try a lower quality, or switch the output to JPEG or WebP.
Does compressing lose the original?
No. Your original files are never changed. The tool only creates new, compressed copies for you to download.
Privacy & offline use
Are my images uploaded anywhere?
No. Everything happens inside your browser using the HTML canvas — your images never leave your device and nothing is sent to a server.
Does it need an internet connection?
Only to load the page the first time. After that the compression runs locally, so it keeps working even offline.
Is there a limit on how many images or how big?
There's no hard limit, but very large images and long batches use your device's memory and CPU. If things slow down, work in smaller groups.
