Drop or select your image above. Choose your output format — WebP and AVIF produce the smallest files for the web, while JPG is best for sharing or email. Drag the quality slider to balance file size against visual quality. Then hit Compress and drag the comparison slider to see exactly how much changed.
All compression happens locally in your browser using the HTML Canvas API. Nothing is uploaded. The page works offline once loaded. There are no file limits, no watermarks, and no account required.
Which format should I use?
WebP is the best all-round choice for websites — 25–35% smaller than JPG at the same visual quality, and supported by all modern browsers. AVIF is even smaller but takes longer to encode and has slightly lower browser support. JPG is best for photos being shared via email or messaging apps. PNG should be used when you need a transparent background or pixel-perfect accuracy (logos, screenshots).
FAQ — Image compression
Does compressing an image reduce its quality?
It depends on the quality setting. At 80 (High), most people cannot spot a difference from the original at normal viewing sizes. Below 65, some compression artefacts — particularly around sharp edges — become visible. Use the before/after comparison slider on this page to judge for yourself before downloading.
How much can I reduce an image's file size?
A typical DSLR photo compressed to WebP at quality 80 loses 60–80% of its file size. A screenshot or graphic with large flat-colour areas can compress even more. Images that are already compressed (like photos taken on modern phones with aggressive in-camera processing) will see smaller reductions.
What is the difference between lossy and lossless compression?
Lossless compression (PNG, or WebP/AVIF at quality 90+) reduces file size without discarding any pixel data — the decompressed image is bit-for-bit identical to the original. Lossy compression (JPG, lower-quality WebP/AVIF) achieves much higher compression by permanently discarding pixel information that is hard for human eyes to perceive. For most photos, lossy at quality 75–85 is indistinguishable from lossless at normal viewing sizes.
Can I compress a PNG to JPG?
Yes — select JPG (or WebP) as the output format. Note that if your PNG has a transparent background, the transparency will be filled with white when converting to JPG since JPG does not support transparency. If you need to keep the transparent areas, use WebP or PNG output instead.
Is it safe to compress images on this site?
Yes. imgquick compresses images entirely inside your browser — we use the HTML Canvas API and JavaScript. Your image data never leaves your device and is never sent to any server. You can verify this by opening your browser's network inspector while compressing — you'll see zero image upload requests.