How to Compress Images in Your Browser

Step by step

1. Choose one supported image

   Open the Image Compressor and select one non-animated JPEG, PNG, or WebP image. The current limits are 25 MB and 25 million decoded pixels. The image is processed in your browser.

2. Review the original

   Check the preview, format, dimensions, and starting file size. Keep a copy of the original if image detail or embedded metadata matters.

3. Set quality when available

   For JPEG and WebP, adjust the quality control. A lower encoder quality may reduce file size but may also make visual changes. PNG uses browser lossless canvas encoding and has no matching quality slider.

4. Optimize and compare

   Choose Optimize image. Compare the measured input and output byte sizes, dimensions, and preview. Download only if the result fits your needs; the output may be the same size or larger.

Compression is not resizing

A 3000 × 2000 pixel image remains at those decoded dimensions in this tool. If a website or form needs a smaller width or height, use the Image Resizer & Cropper instead. Reducing pixel dimensions can reduce file size too, but it also changes how large the image can be displayed sharply.

JPEG, PNG, and WebP behave differently

JPEG is commonly used for photographs and its quality setting trades some encoded detail for file size. WebP can use lossy or lossless encoding, but this compressor applies a quality setting and keeps the original format. PNG encoding is lossless from the decoded pixels; the resulting PNG can still be larger if the browser encoder does not reproduce a more efficient representation.

The quality number describes an encoder setting, not a promised percentage reduction. Compare the preview and measured byte sizes instead of assuming that a particular setting will save a fixed amount.

Know what re-encoding can change

The browser decodes the selected image and writes a new image from its pixels. That can change visible detail for lossy formats. Canvas re-encoding may also remove EXIF metadata such as camera or GPS information, color-profile details, and other metadata. Animated files are rejected; GIF, SVG, TIFF, and HEIC are not supported by this tool.

Common mistakes to avoid

• Expecting every image or PNG to become smaller.
• Treating the quality percentage as a file-size target.
• Using compression when the actual requirement is fewer pixels.
• Replacing the original without checking image detail or metadata needs.

Helpful checks

• Compare at the display size where the image will be used.
• Keep originals when metadata or exact pixels matter.
• If a file-size cap is strict, verify the downloaded file itself before submitting it.

Frequently asked questions