Image Compressor
Compress and resize PNG, JPEG and WebP images, then download the result.
このコンテンツは英語です。
Drag an image here or choose one
計算例
Shrinking a holiday photo
A JPEG photo uploaded with the quality slider left at its default
A smaller JPEG with the same width and height as the original. The new file size depends on the photo, so the result shows the before and after sizes.
The slider applies to JPEG and WebP, so lowering it trades a little detail for a smaller file.
Compressing a logo with transparency
A PNG logo with a transparent background uploaded
A PNG with the same dimensions and transparent background, saved without loss. The quality slider has no effect on PNG output.
PNG is always lossless, so compressing it will not reduce detail, and the file may only shrink slightly.
Image Compressor について
Large image files slow down web pages, fill up email attachments and can exceed the size limits of online forms. An image compressor reduces file size by adjusting how much detail is kept, and resizing lowers the pixel dimensions. This tool handles PNG, JPEG and WebP files, so you can shrink a photo or graphic before you share or publish it.
The quality slider controls the trade-off between size and appearance. A lower setting gives a smaller file but can introduce visible artefacts, such as blurring or blockiness in areas of fine detail. A higher setting keeps more detail at the cost of a larger file. After compression, the tool shows how much space you saved, so you can compare the result with the original.
Image Compressor の使い方
- Add the PNG, JPEG or WebP image you want to shrink.
- Move the quality slider to balance file size against visible detail.
- Resize the dimensions if the image is larger than you need.
- Check the size saved and compare the result with the original.
- Download the compressed image.
主な使いみち
- Reducing photos for a website to speed up page loading
- Shrinking screenshots to fit an email or form upload limit
- Preparing product images for an online shop
- Making a set of images quicker to share with a team
よくあるご質問
How do I compress a JPEG without losing quality?
No compression method is entirely lossless for JPEG, because the format already discards some detail. You can, however, reduce size with a high quality setting, which keeps most visible detail while cutting the file size. Compare the output with the original at full size, and lower the slider only until you notice a loss you can accept.
What is the best image format for smaller file sizes?
WebP usually produces smaller files than PNG or JPEG at similar visual quality, so it is a strong choice for web images. PNG suits graphics with sharp edges, flat colours or transparency, and JPEG remains widely supported for photographs. Pick the format that your platform accepts, then compress it with the slider until the size fits your limit.
How much can I reduce an image's file size?
The saving depends on the starting file, its content and the quality you choose. Photographs with fine detail and noise often shrink a lot, while simple graphics may not shrink much at all. Resizing the dimensions also reduces size, sometimes more than compression alone. The tool reports the size saved after each compression, so you can judge the outcome.
Does compressing an image change its dimensions?
Adjusting the quality setting keeps the pixel dimensions the same, while resizing changes them. If you only need a smaller file, adjust the quality slider first. If the image is larger than your layout or upload limit needs, resize it as well. Reducing dimensions often makes a bigger difference to file size than quality alone for very large images.
Will compressing an image reduce its quality?
Yes, lowering the quality setting reduces visible detail, which is the trade-off for a smaller file. The effect depends on the image. Smooth gradients can band, and text or fine lines can look soft at low settings. View the compressed version at the size it will be used, and raise the quality if the difference is noticeable.