Image Optimizer - Optimize Images for the Web, Free
Use this free image optimizer to compress, resize, and convert images to WebP in one place. Everything runs in your browser, so there is no upload, no limit, and total privacy.
Unlimited images, No File Size Limits.
Why use CompressImage.io to optimize images?
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No Limits
As the compression is happening in the Browser, there are no limits on how many images you can convert or what size of image you can convert.
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100% Private
Since no images are sent to any servers, your images are totally safe and private as no one else can see your images.
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Low Carbon Footprint
Since no servers are involved in the compression process, zero extra electricity is used, hence no carbon emitted.
How to Image Optimizer
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Add your images
Drag your JPG and PNG images onto the tool or click Select Files. Add a single image or a few hundred. There is no limit.
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Each image is optimized right away
Your browser optimizes every image the moment you add it. Open Settings to resize to a maximum width or height, or convert to WebP for the smallest files.
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Download optimized images
Save each optimized image on its own or download the whole set as a ZIP, ready to drop straight into your site or app.
What it means to optimize an image
Optimizing an image is three jobs in one: compress the file, resize the dimensions, and, where it helps, convert to a smaller modern format. This image optimizer does all three in the browser, so your files are never uploaded.
- Compress JPG and PNG images by up to 90 percent.
- Resize to a maximum width or height so you never serve an oversized image.
- Convert to WebP for the smallest modern-format files.
There is no server, no account, and no limit on how many images you optimize.
How to optimize images for the web
Page speed is a confirmed Google ranking factor, and images are usually the biggest part of page weight, so optimizing them is the highest-impact thing you can do for performance. Work in this order:
- Right-size the dimensions. Resize each image to the largest size it is displayed at. A 5000px photo in a 1000px container is wasted data.
- Compress the file. Strip the excess data every image carries by default.
- Use a modern format. WebP is smaller than JPEG and PNG at the same quality and works everywhere.
Optimize one image or your whole library
Need format-specific control? Jump straight to the PNG compressor or the JPEG compressor. Have a whole folder to get through? The bulk image compressor optimizes them all at once.
Frequently Asked Questions
What does an image optimizer actually do?
An image optimizer reduces file size through compression, resizing, and modern formats like WebP, so pages load faster while the images still look good. Smaller images also help your Core Web Vitals and SEO.
How does optimizing images speed up my website?
Images are usually the heaviest part of a web page. Cutting their size by 50 to 90 percent means less data to download, faster load times, a better Largest Contentful Paint score, and a smaller bandwidth bill.
What is the best format for web images?
WebP gives the best compression for most photos and graphics and works in every modern browser. Use Convert to WebP to optimize for the web, and keep PNG for transparency and crisp UI graphics.
Are my images uploaded to a server?
No. Every image is optimized locally in your browser. Nothing is uploaded, so the tool is private, fast, and works offline.
Should I resize images before putting them on my site?
Yes. Serving a 4000px image in an 800px slot wastes bandwidth. Set a maximum width or height in Settings to resize each image to the largest size it will actually be shown at.