Why image size matters
Photos from a modern phone or camera are large — often several megabytes each. That is fine on your device, but it becomes a problem when you try to email a batch, upload to a form with a size limit, or add many pictures to a website that then loads slowly. Compressing an image reduces its file size so it is easier to send, upload, and store.
What "compression" really does
Image compression removes detail that your eye is unlikely to notice, and saves the picture more efficiently. A quality slider controls how much it removes. High quality keeps the picture almost identical but shrinks it a little; lower quality makes a much smaller file with some visible loss. The goal is to find the point where the file is small enough but still looks good to you.
Step by step
- Open the Compress Image tool.
- Add one or more images (JPG or PNG).
- Move the quality slider to pick how much to compress.
- Download the results. Several images arrive together in a zip.
Finding the right balance
There is no single "correct" setting — it depends on the picture and where it will be shown. A good method is:
- Start near the middle of the slider.
- Download and open the result.
- If it still looks good, try a little lower to save even more.
- If you see blur or blocky patches, move it back up.
Photos with lots of fine detail (grass, hair, textures) need a higher setting. Simple images with flat colours can go lower without looking bad.
Keep your original
Compression removes detail and cannot be reversed. Always keep the original full-quality photo, and compress a copy. That way, if you later need the sharp version — for printing, say — you still have it.
Is it private?
Yes. The Compress Image tool runs inside your browser on your own device. Your photos are never uploaded to a server. That matters more than people think: photos can contain personal moments and hidden location data, so keeping them on your device is the safer choice.
JPG, PNG, or WebP?
- JPG is best for photographs and gives small files.
- PNG is best when you need a transparent background or very sharp edges, but files are larger.
- WebP often gives the smallest file at the same quality, and modern browsers all support it.
If you want to switch format as well as size, use Resize & Convert Image, which can change both the dimensions and the format.
A quick example
You want to email 10 holiday photos, but together they are 40 MB — too big. Open Compress Image, add all 10, set a high-but-not-maximum quality, and download the zip. The photos might now total under 10 MB and still look great on a screen.
Try it now — free and private
Need smaller photos? Open the Compress Image tool, set the quality, and download lighter files.