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Image Compressor

Reduce image file size without visible quality loss — entirely in your browser.

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Drag an image here, or

JPEG  ·  PNG  ·  WebP

🔒 Images never leave your device. Compression uses the browser's built-in Canvas API — no third-party library, no server.

How to compress an image online

Upload a JPEG, PNG, or WebP image using the button above or drag it into the drop zone. Use the Quality slider to control the compression level — lower values mean smaller files with slightly less sharpness. Use the Max dimension slider to reduce the image's width and height if you also want to resize it. The output preview and file size update automatically as you adjust the sliders.

Which format does the output use?

JPEG inputs are saved as JPEG. PNG and WebP inputs are saved as WebP when your browser supports it (all modern browsers do), because WebP typically produces 25–35% smaller files than PNG at the same visual quality while also preserving transparency.

Why is my compressed file sometimes larger?

This happens most often with small PNG files that contain simple graphics, logos, or screenshots. PNGs are lossless — they can be extremely efficient for flat-colour images. Converting them to JPEG or WebP at a general quality setting can produce a larger file than the original. If this happens, try reducing the quality slider or leave the image as-is, since it is already well-compressed.

Frequently asked questions

Are my images uploaded to a server?
No. The tool uses the browser's Canvas API. Your image is loaded into memory in your browser tab, compressed there, and downloaded back to your device. Nothing is sent over the network.
What is the maximum file size I can compress?
There is no enforced limit. Very large images (50 MB+) may be slow depending on your device, but the tool will process them.
Will PNG transparency be preserved?
Yes. PNG and WebP inputs are output as WebP, which supports transparency. JPEG does not support transparency — if you need to keep a transparent background, avoid uploading JPEG files.
What quality setting should I use?
75–80% is the sweet spot for most photos — noticeably smaller file size with no visible quality difference on screen. For images used on websites, 70% is often sufficient. For print-quality output, stay above 85%.

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