How to Resize an Image Without Losing Quality
Updated July 20, 2026 · 5 min read
Resizing can soften an image if you do it wrong. Here's what actually causes quality loss and how to keep your images sharp when changing dimensions or file size.
Downscaling vs. upscaling
Making an image smaller (downscaling) is safe: you're discarding detail you don't need, and a good resizer uses high-quality interpolation to keep edges crisp. Making an image larger (upscaling) is where quality suffers — you're asking the software to invent detail that was never captured, which looks soft or blocky.
The practical rule: always start from the largest, highest-resolution source you have, and resize down to your target. Never resize up from a small image if you can avoid it.
Choose the right format
PNG is lossless — it never degrades, but files are large; it's ideal for logos, icons, screenshots and anything with transparency. JPG is lossy and great for photos where small size matters. WebP gives roughly 25–35% smaller files than JPG or PNG at the same visual quality, and every modern browser supports it — it's usually the best choice for the web.
Compress to a target size the smart way
If you need a file under a specific size (say 1MB or 100KB), don't just crank quality all the way down. A good compressor searches for the highest quality level that still fits under your target, so you get the smallest visible loss. Switching from JPG to WebP often lets you hit the same target at noticeably higher quality.
When you need it bigger, outpaint instead of upscale
If your real goal is a bigger canvas rather than more resolution — more background, a wider frame — don't upscale. Use AI outpainting to generate new surrounding content at full quality, keeping your original pixels intact.