Compress Images Online

Compress images in your browser

Reduce image file size by adjusting output format and quality before downloading the result.

How to reduce image file size

Choose one or more PNG, JPG, or WebP images.
Select an output format and adjust quality where available.
Review the result and download one file or a batch ZIP.

Balance JPG and WebP quality against file size

Start with a JPG, PNG or WebP image, choose the output format and compare the original with the compressed result. Lower JPG or WebP quality can save space but may blur fine textures or text. Compression keeps the original pixel dimensions; it is not a substitute for resizing a very large image.

Why PNG compression may not make a smaller file

PNG output does not use the lossy quality slider in the same way as JPG or WebP. Re-encoding an already optimized image may produce a file that is the same size or larger. Try WebP when the destination supports it, or JPG for an opaque photo. Check transparency before changing formats.

Compress multiple images on your device

Batch mode applies shared quality and format settings to several files, then packages successful results in a ZIP. The Original format option keeps each input format. Processing uses local browser memory rather than uploading selected images to IMGIUM's servers. Smaller batches can help when working with high-resolution photos on a phone.

Image compression questions

How does quality affect file size?

Lower quality usually reduces file size. Results vary depending on image content and browser support.

Does PNG use the quality setting?

No. PNG is not controlled by the same lossy quality setting as JPG or WebP.

Are images uploaded to a server?

No. Selected images are processed in your browser and are not uploaded to IMGIUM's own servers.

Can I compress an image to an exact file size?

There is no target-KB control. Adjust the quality and output format, inspect the result size, and try again if necessary. The final size depends on the image content and browser encoder.

Can I compress multiple images at once?

Yes. Select batch mode, add the images, apply the shared settings and download the completed results as a ZIP file.

When compression alone is not enough

Reducing pixel dimensions can help when the image is much larger than its intended display size. For formats outside this compressor's input selection, open the converter first.

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