Compress images without visible quality loss
You can usually cut a photo to 20–40 % of its original size before any human eye notices. Here is how to do it correctly.
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JPG · PNG · WEBP · HEIC — files never leave your browser
File size is controlled by three things: pixel dimensions, encoder quality, and format. Reducing dimensions saves the most bytes, lowering quality is a smooth trade, and switching format (JPG→WebP) gets you 25–35 % more compression for free.
For photos, JPG quality 75–85 is the sweet spot — visually identical to the original, but a fraction of the size. Below quality 60 you start to see blocky artifacts in skies and skin tones.
WebP at quality 80 typically matches JPG quality 90 at 30 % smaller file size. PNG should only be used for graphics with sharp edges, transparency, or text — never for photos.
The tool below uses a binary search to find the highest quality that fits your target size, and only scales the image down if the encoder cannot reach the target at any quality. That gives you the best possible result for any byte budget.
What "without losing quality" really means
Almost every compressor on the web is technically lossy — the only truly lossless compressors are PNG and lossless WebP, and both produce much larger files than JPG. The honest version of the promise is "compressed to a level where the loss is invisible to the eye". Hitting that threshold is mostly about choosing the right encoder settings, not about magic.
The four levers
- Encoder quality. JPEG and WebP both expose a quality parameter from 0 to 100. Below ~70 you start to see soft blocks in flat areas; above ~85 the difference is invisible. The range 75–85 is where most pages should land.
- Pixel dimensions. Halving the width and height quarters the pixel count, which divides file size by roughly four with no quality loss at the new size. The biggest single file-size win on most websites is just resizing — a 4000-pixel phone photo displayed at 800 pixels wastes 96% of its data.
- Format. WebP is 25–35% smaller than JPG at the same visual quality. AVIF can be smaller again but is not yet supported by every email client and form uploader.
- Chroma subsampling. JPEG can store color at half resolution (4:2:0) without visible loss for photographs. Most encoders default to this; we don't.
The right order of operations
- Resize first to the largest dimensions you actually need.
- Crop tighter if the spec allows it.
- Pick a modern format (WebP if accepted, JPG otherwise).
- Set quality to 80 and check the result.
- Adjust quality up or down only if needed.
How our compressor automates this
The editor on every compress page binary-searches the JPEG quality between 0.40 and 0.95 to find the highest setting that still fits your target file size. If quality alone can't get there, it progressively scales the canvas down by 10% and re-runs the search. Quality reduction is always preferred to resolution reduction. Full details are on our Methodology page.