Free Online Image Compressor

How the image compressor works

Everything happens in your browser. When you add an image, it is resized and saved again on your own device using the browser's built in canvas, and nothing is uploaded to our server. That keeps it fast and keeps your files private.

The tool accepts JPG, PNG and WebP files. By default it exports WebP, which gives small files and works in all modern browsers. You can switch the output to JPG or PNG when you need those formats.

Steps to compress images online

1. Drag your images into the upload area, or click to choose files.
2. Pick a preset, or set the quality slider, target size and max width yourself.
3. Choose the output format: WebP, JPG or PNG.
4. Download each image, or use Download All to get them in one ZIP file.

Choosing the right settings

• Fastest: resizes wide images to 1600 pixels at 75% quality. Good for blog images and most website content.
• Balanced: up to 1920 pixels at 75% quality. A good fit for full width banners.
• Detail: up to 2560 pixels at 88% quality, for photos where fine detail matters, like product close ups.
• Max width (px): type an exact width, for example 1200 for a blog column, and wider images are scaled down to fit. This overrides the preset width. Images are never made bigger.
• Quality slider: runs from 60% to 100%. For most photos the difference between 75% and 85% is hard to see, while the file size drops a lot.

Why it pays to reduce image size

Images are often the heaviest part of a web page. A photo straight from a phone or camera can be several megabytes, while the same image at the right width for a website usually needs only a small part of that. Smaller images load faster, use less mobile data and help your Core Web Vitals, especially Largest Contentful Paint when a large image sits at the top of the page.

Check the result before you upload

After compression, the tool shows the new size of each file and how much you saved. Open one or two images at full size and look at areas with fine detail, like hair, text or sharp edges. If you see blocky patches or blurred text, raise the quality a little or switch to the Detail preset. If the image still looks good, you can usually lower the quality a bit more and save even more space.

Tips for website images

• Resize before you upload. There is no need for a 4000 pixel image in an 800 pixel column.
• Use WebP where you can, and keep JPG for places that do not accept it, such as some email tools.
• Use PNG only for images that need sharp edges or transparency, like logos and screenshots.
• Give every image a clear file name and alt text before you upload it. The SEO analyzer will tell you which images on a page are missing alt text.

Run your new images through the image compressor every time you add them to your site. It takes a minute and is one of the easiest ways to reduce image size across your pages.

Official reference: web.dev's article on choosing the right image format is a helpful read if you are unsure whether a picture should be JPG, PNG or WebP.