Image Compressor

Reduce image file size without changing the job your image needs to do. Toolinet’s free image compressor helps you prepare JPG, PNG and WebP files for websites, email attachments and online forms. Choose your images, adjust compression, compare the output and download the version that works for you. Image processing takes place in your browser.

What this image compressor does

Compression reduces the amount of data used to store an image. Depending on your settings and output format, that can mean more efficient encoding, fewer colors or a loss of some visual detail. The aim is a smaller useful file, not simply the lowest possible number of kilobytes.

You can add up to 20 images, with a maximum of 30 MB per image. Choose a preset, change quality and keep the original format or select JPG, PNG or WebP. Once processing finishes, download individual images or collect completed outputs in a ZIP.

How to compress an image online

1. Add your images. Use Choose images, drag supported files into the tool or try the built-in sample.
2. Start with Balanced. This is a practical starting point when you want a smaller file and reasonable visual quality.
3. Choose the output format. Keep the source format when compatibility matters, or compare another supported format.
4. Run compression. Wait for the file status to show completion. Review original and optimized sizes.
5. Compare before downloading. Inspect text, sharp edges, gradients and small details at the size people will actually see.
6. Save the result. Download the image or use Download all · ZIP for completed files.

Choosing quality and compression settings

The Balanced, Smaller files and High quality presets offer different starting points. A lower JPG or WebP quality can save more space but may introduce softness, block patterns or uneven gradients. If small text becomes hard to read, increase quality or use an appropriate lossless format.

PNG behaves differently from JPG. Smart PNG compression can reduce the color palette, so a lower setting does not mean exactly the same thing across every format. Compare the actual result instead of assuming that one quality number produces identical images.

JPG, PNG or WebP: which should you choose?

A smaller file is only helpful if the receiving website or application accepts it. Keep the required format when an upload form explicitly asks for JPG or PNG.

A practical compression example

During Toolinet site testing on 25 October 2026, the built-in landscape sample was shown as 1.22 MB before compression and approximately 450 KB afterward, with a reported saving of 64%. The downloaded JPG retained its 1800 × 1200 dimensions. This is one sample result, not a promised saving for every image.

If your own photo is still too large, check whether its pixel dimensions exceed the destination’s needs. A huge image can remain heavy even at a lower quality. Use the Image Resizer to reduce unnecessary dimensions, then compress the resized copy.

Compression, resizing and cropping are different

Compression mainly targets file size. Resizing changes pixel width and height. Cropping removes parts of the image. For a product photo, first use the Image Cropper to choose the frame, resize to your store’s requirements, then compress. This order avoids preserving pixels that you do not need.

Why a compressed file may not become smaller

Some images are already efficiently encoded. A different output format, a higher quality setting or a lossless export can produce a file as large as the original or larger. Review both sizes and use the smaller suitable version. Repeatedly compressing an already lossy image can reduce detail without delivering a useful saving.

Privacy, metadata and browser limits

Your selected images are processed on your device. Ordinary page and asset requests still reach the website host; read the privacy information for context. Re-encoded downloads remove EXIF metadata. If an original is kept unchanged, its metadata can remain.

Keep original files, use a current browser with JavaScript enabled and reduce the batch size if memory is limited. If processing fails, try one smaller valid image before retrying the full batch. The Help page explains downloads and common browser issues.