Why Images Lose Quality When Resized
When you reduce an image's dimensions, the software has to throw away pixel data — that's unavoidable. But how much quality you lose depends entirely on the format you save to and the quality settings you use.
The two main quality killers are: saving to JPEG at low quality (produces visible compression artefacts), and upscaling a small image to a large size (adds blur because the data simply isn't there).
The 5 Rules for Resizing Without Quality Loss
Reducing a 2000px image to 1080px always looks better than stretching a 600px image to 1080px. Start with the highest resolution source you have.
WebP gives 25–35% smaller files than JPEG at the same visual quality. Use it for web, social media, and anywhere file size matters.
PNG is lossless — it never degrades quality. Use it for screenshots, logos, text, and anything with sharp edges or transparency.
Below 80%, JPEG compression artefacts become visible. Above 90%, file size grows quickly with minimal quality gain. The sweet spot is 85%.
Stretching an image to a different aspect ratio (like 1:1 to 16:9) distorts it. Use "Contain" mode with a background to preserve the ratio.
Every time you save a JPEG, it re-compresses — degrading slightly each time. Resize from the original once, save, done.
Downscaling vs Upscaling — Why One Works and One Doesn't
Downscaling (making an image smaller) always works well — you're averaging multiple pixels into one, which produces a smooth, sharp result.
Upscaling (making an image larger) is fundamentally limited — the browser has to invent pixel data that doesn't exist. Standard bicubic upscaling adds blur. AI upscaling (like that in Photoshop or Topaz) produces better results but is a completely different technology. For standard in-browser resizing, always start with a high-resolution source.
Which Format Should You Use?
WebP — best all-round for web and social
WebP supports both lossy and lossless compression, supports transparency (like PNG), and produces files 25–35% smaller than equivalent JPEG. All modern browsers and social platforms support it. This is the best choice for 90% of use cases.
PNG — best for graphics with text or transparency
PNG is completely lossless — no quality degradation ever. Use it for logos, screenshots, diagrams, and any image that needs a transparent background. The trade-off is larger file sizes for photos.
JPEG — best for photos where file size matters
JPEG is the safest choice for maximum compatibility (every device, every platform, every app). Use it when WebP support is uncertain, or when you need the smallest possible file for a photo. Keep quality at 80–90%.
Resize with quality control — free, in your browser
Choose WebP, PNG, or JPG. Set quality with the slider or use Target File Size for exact results.
Resize Your Image Free →