The image compressor makes an image file smaller without changing its size on screen, right in your browser. Choose a photo or picture, pick a quality level and an output format, press Compress Image, and download the smaller file. The image never leaves your device: it is read and re-encoded on your own computer or phone, and nothing is uploaded, stored, or tracked.
What Does Compression Do?
An image file stores the colour of every point in the picture. Compression throws away some of that detail in a way the eye barely notices, so the file takes up less space. A lower quality setting removes more detail and makes a much smaller file; a higher setting keeps more detail and makes a larger file. The picture keeps the same width and height in pixels — only the file size changes. That is different from resizing, which changes the pixel dimensions. This tool does not resize: use the Image Resizer if you need a smaller picture as well as a smaller file.
Compression is lossy for JPEG and WebP output, which means some detail is permanently removed and cannot be recovered from the compressed file. Keep your original file if you may need the full quality later, and always check the compressed result before you delete anything.
How to Use the Compressor
- Choose an image file from your device. JPG, PNG, and WebP images are accepted.
- Set the quality. The default is 80, a good balance for most photos. Lower it for a smaller file, raise it for better quality.
- Choose the output format: JPEG for photos, PNG when you need transparency or exact colours, WebP for the smallest modern format.
- Press Compress Image, check the original and compressed sizes shown, and download the compressed file.
Worked Example
Take a phone photo saved as a JPEG of about 3 MB. Choose it, leave the quality at 80 and the format as JPEG, and press Compress Image. The tool shows the original size, the compressed size, and the percent saved — for a typical photo the compressed file is often well under half the original size, with no visible change at normal viewing sizes. If the saving is small, try a lower quality, such as 65, and compare the result. If the picture will be printed large, keep the quality at 85 or above and accept a larger file.
Which Format Should You Choose?
JPEG is the safest choice for photographs and works everywhere, including older phones and email. It does not support transparency: any transparent areas in a PNG are filled with white when converted to JPEG. PNG keeps exact colours and transparency, which suits logos, screenshots, and graphics with text, but PNG files are usually larger for photos. WebP gives the smallest files at the same quality and supports transparency, and it works in all modern browsers, but a few older programs cannot open it. When in doubt, keep JPEG for photos and PNG for graphics.
Privacy and Limits
All processing happens in your browser. Your image is not uploaded to a server, not stored, and not seen by anyone else. The tool compresses one image at a time and does not change the picture’s dimensions, crop it, or add a watermark. Very large images may take a few seconds on a slower device, and the result depends on the picture itself: a photo full of fine detail compresses less than a simple graphic. If a file will not load, check that it is really an image file and try again with a JPG, PNG, or WebP file.
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Frequently Asked Questions
How do I compress an image?
Choose the image, set the quality and output format, and press Compress Image. The tool shows the original size, the compressed size, and the percent saved, with a download link for the smaller file.
Is my image uploaded anywhere?
No. The image is processed entirely in your browser and never leaves your device.
Will compression change the size of the picture?
No. The width and height in pixels stay the same; only the file size changes. To change the pixel dimensions, use the Image Resizer.
What quality should I use?
80 is a good default for photos. Use 60 to 70 for the smallest files for web use, and 85 or above when the picture will be printed or shown large.
Does JPEG keep transparency?
No. Transparent areas become white in JPEG output. Choose PNG or WebP if the picture needs transparency.
Why is my PNG still large after compression?
PNG is a lossless format, so re-encoding a photo as PNG saves little. Choose JPEG or WebP for photographs to get a much smaller file.
Can I compress several images at once?
No. This tool compresses one image at a time. Repeat the steps for each image you need to shrink.