How To Compress İmages Without Losing Quality
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The three quality levers
“Without losing quality” is technically a lie — every lossy compressor loses something. The real question is whether you can tell. With the right format, the right dimensions, and a reasonable quality setting, you can cut a 4MB photo to 200KB and no one — not even you — will see the difference. This guide is the short version of what actually moves the needle, and what doesn’t.
When JPG beats PNG
JPG is for photographs — anything with continuous tones, skin, sky, landscapes. PNG is for anything with sharp edges and flat color: logos, icons, screenshots of UI, text. Save a photo as PNG and you’ll end up with a 4MB file that a 300KB JPG would match visually. Save a logo as JPG and you’ll get ugly compression halos around the edges.
When WebP and AVIF win
Rough rule: if the image has a camera in its history, it’s a JPG. If it came out of Figma, Illustrator, or a screenshot, it’s a PNG.
Resize before you compress
WebP is usually 25-35% smaller than JPG at the same visual quality, and supports transparency like PNG. AVIF goes further — often 50% smaller than JPG — but encoders are slower and ancient software doesn’t understand it. For a modern website or a blog image, WebP is the default answer. AVIF if you control the whole stack and care about the last 20% of savings.
Acceptable file sizes in the wild
For anything leaving your site — email, Slack, a print shop, iMessage — stay in JPG or PNG. The recipient’s tool chain may or may not handle the newer formats.
Testing with a quality slider
Rough targets, after both resizing and compression:
What doesn’t help
The honest way to pick a quality setting: export at 90, 80, and 70, open all three side by side at 100% zoom, and pick the lowest number where you genuinely can’t tell the difference from the original. For most photos, that’s 80-85. For screenshots with text, stay at 90+ or you’ll see fringing on letters. Don’t trust your memory — open them side by side.