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How to resize an image without losing quality

"Resize" and "lose quality" get tangled together, but they are not the same thing. Shrinking a photo — going from a 4000-pixel camera original down to something a web page can use — keeps almost all of its sharpness when it is done well. The quality loss people worry about usually comes from the wrong tool, the wrong direction, or a second compression step further down the line. Here is how to get a clean result every time.

Shrinking is safe; enlarging is not

Making an image smaller throws away pixels you did not need, and a good downscaling filter blends the remaining ones so edges stay crisp. This tool uses a high-quality Lanczos filter for exactly that reason. Making an image larger is the opposite problem: there is no extra detail to add, so a plain resizer just stretches what is there and the result looks soft. That is why enlarging is switched off by default. If you genuinely need more pixels — a tiny logo, an old thumbnail — reach for an AI upscaler, which reconstructs edges and texture instead of stretching them.

Pick a target: pixel width or percentage

You can fit the longest side to an exact pixel width, or scale everything by a percentage. Use a pixel width when you have a specific target in mind:

• Blog and article images — 1600px on the longest side is sharp on retina screens without the weight of a full camera file.
• Email and upload limits — 1000–1200px usually slips under size caps while still looking good.
• Thumbnails and avatars — 400–800px is plenty, and much lighter.

Reach for percentage scaling when you have a batch of mixed sizes and just want everything uniformly smaller — say, every image at 50% — without picking a number for each one.

Export to the right format

Resizing and format are two separate choices, and the format often matters more for file size. WebP is the best default for photos — typically 25–35% smaller than JPG at the same visible quality. Keep PNG for graphics with sharp edges or transparency, and fall back to JPG only when an older tool needs it. Our PNG to WebP guide walks through when each one wins.

Still too big? Resize, then compress

Resizing changes the dimensions; it does not re-compress the image. A photo scaled to 1600px is already far smaller, but if it still needs to be lighter, run it through a compressor as a second step — that is where you trade a sliver of quality for a large drop in bytes. The two tools stack cleanly: resize for the right dimensions, compress for the right weight. The guide to reducing file size covers the full workflow.

Everything stays on your device

Every resize here runs locally in your browser with WebAssembly. Your images are never uploaded, there is no account, and there is no limit on how many you process — drop a whole folder and download the batch as a zip. For the full walkthrough with worked examples, read Resize an image without losing quality.