Compress Images Online

Reduce your image file size without losing quality

What Is Image Compression?

Image compression reduces the file size of an image while keeping the image usable and visually clear.

Smaller image files take up less storage space and can be faster to upload, download, and display on websites and other applications.

How to Compress an Image

Upload an image to the compressor and choose your preferred compression settings.

The image is processed using the selected settings and a compressed version is created for you to preview.

Once you are satisfied with the result, download the compressed image and use it wherever you need it.

Image Quality and File Size

Image compression involves a tradeoff between file size and image quality. Increasing compression can reduce the file size further, but may also remove more visual detail.

A higher quality setting generally preserves more detail and produces a larger file, while a lower quality setting generally produces a smaller file.

The best setting depends on how the image will be used. An image displayed on a website may not need the same quality or resolution as an image intended for printing.

Supported Image Formats

Different image formats use different methods of storing and compressing image data.

• JPG and JPEG — Commonly used for photographs and other images with many colors and smooth gradients.
• PNG — Supports transparency and is often useful for graphics, illustrations, screenshots, and images with sharp edges.
• WebP — A modern image format designed to provide efficient compression while supporting features such as transparency.

The amount of compression that can be achieved depends on the image itself, its format, dimensions, and the selected compression settings.

Tips for Reducing Image File Size

• Choose a quality level appropriate for how the image will be used.
• Resize very large images when their original dimensions are unnecessary.
• Use an efficient image format that is suitable for your intended use.
• Compare the compressed image with the original before using it.
• Avoid compressing an already heavily compressed image repeatedly, as this can reduce image quality.

Image Dimensions and File Size

Image dimensions have a significant effect on file size. An image with more pixels contains more visual data and will generally require more storage space.

For example, an image that is much larger than the size at which it will be displayed on a website may contain unnecessary pixels.

Reducing the dimensions of an image can therefore be an effective way to reduce its file size while keeping it large enough for its intended use.

Lossy and Lossless Compression

Image compression can generally be divided into lossy and lossless compression.

Lossy compression reduces file size by removing some image information. Depending on the compression level, the difference may be difficult to notice or may become clearly visible.

Lossless compression reduces file size without permanently removing image information. The original image data can be reconstructed from the compressed file.

The type of compression available depends on the image format and the compression method being used.

Image Compression for Websites

Compressing images before adding them to a website can help reduce the amount of data visitors need to download.

Smaller images can also make it easier to store and transfer media, particularly when a page contains multiple images.

Compression should be balanced with image quality so that the images remain clear and suitable for their intended purpose.

Frequently Asked Questions

Does image compression reduce quality?
It can. Lossy compression removes some image information, which can reduce visual quality depending on the compression level. The effect may be barely noticeable at moderate settings but more obvious at higher levels of compression.

How much can an image be compressed?
There is no fixed amount. The achievable reduction depends on the original image, its format, dimensions, and how much compression has already been applied.

What image format is the smallest?
There is no single format that produces the smallest file for every image. The best format depends on the type of image, its contents, and the requirements of the application where it will be used.

Is WebP smaller than JPG?
WebP can produce smaller files than JPG for many images at a similar visual quality, but the result depends on the particular image and compression settings.

What quality should I use when compressing an image?
There is no single quality setting that works best for every image. Use the highest compression level that produces an image quality suitable for its intended purpose.

Can I compress an image without losing quality?
Lossless compression can reduce the file size without permanently removing image information. However, the reduction may be smaller than what can be achieved with lossy compression.

Does resizing an image reduce its file size?
Yes. Reducing the dimensions of an image reduces the number of pixels that need to be stored and can significantly reduce the resulting file size.

Should I compress images before uploading them to a website?
Compressing images before uploading them can reduce their file size and the amount of data required to transfer them. Make sure the resulting image still has sufficient quality and dimensions for its intended use.

Can I compress multiple images?
Yes. Multiple images can be compressed using the same compression settings, making it easier to process a group of images at once.

Privacy

Images are processed according to this tool's current upload and processing method. Check the site's privacy policy for details about how uploaded files are handled and whether they are stored.

Disclaimer

Image compression results vary depending on the original image, format, dimensions, and selected settings. Always check the compressed image before using or replacing the original.