What is an image compressor?
An image compressor is a tool that shrinks the file size of a photo or graphic while keeping it looking sharp. It works by re-encoding the picture and trimming data the eye barely notices, so a heavy 5 MB photo can become a few hundred kilobytes. This free image compressor lets you compress JPG, PNG and WebP files and reduce image size online, with no software to install and no sign-up.
How to compress an image and reduce image size
- Add your images. Drag them onto the box above or click to browse. You can compress a whole batch at once.
- Pick an output format. Auto keeps the original type, JPG gives the smallest photos, WebP is even smaller and modern, and PNG stays lossless.
- Set quality and size. Lower the quality slider to reduce image size further (75 to 85 percent is the sweet spot), and optionally cap the width to shrink large photos.
- Compress and download. Press Compress to see the new size and percentage saved, then download each image or grab them all as a ZIP.
Why compress images?
- Faster websites. Large images are the number one cause of slow pages. When you compress an image, it loads quicker and helps your SEO and Core Web Vitals.
- Email and upload limits. Many forms, emails and portals cap attachment size, so compressing gets you under the limit without cropping anything out.
- Save storage and data. Smaller photos take up less space on your phone or drive and use less mobile data when you share them.
Compress JPG, PNG and WebP: which format to choose
JPG and WebP are lossy: they discard detail your eye barely notices to make files dramatically smaller, which is ideal for photographs.PNG is lossless: it keeps every pixel exactly, which matters for logos, screenshots and graphics with sharp edges or transparency, though the files stay larger. For most photos, WebP at around 80 percent gives the best size-to-quality ratio, while JPG is the safer pick when you need maximum compatibility across older apps and devices.
How small can I make an image?
How far you can reduce image size depends on the original. A detailed photo usually compresses to 20 to 40 percent of its starting size at 80 percent quality with no visible loss. Resizing the width as well (for example capping a 4000 px photo at 1600 px) often saves even more, since the largest dimension drives most of the file size. Use the live before-and-after readout to find the smallest setting that still looks good.
Frequently asked questions
How do I compress an image online for free?
Add your photos to the image compressor above, choose an output format, lower the quality slider, then press Compress. You can download each file or all of them as a ZIP, with no sign-up and no watermark.
Is there a file size or batch limit?
No limits and no watermark. Compress as many images as you like and download them individually or as a single ZIP.
What formats can I compress?
You can compress JPG, PNG, WebP, GIF and BMP images, and export to JPG, WebP or PNG.
Will compressing reduce quality?
JPG and WebP are lossy, and you control the trade-off with the quality slider. At 75 to 85 percent the result is usually visually identical while the file is much smaller.
Related: got iPhone photos? Convert them first with ourHEIC to JPG converter, then compress them here.