Resize Image Online

How to resize an image

1. Choose your image — the current dimensions appear immediately.
2. Type a new width or height. With the lock enabled, the other value follows.
3. Or tap a preset: 25%, 50%, 75%, 600×600, 1080×1080, 1920×1080.
4. Press Resize and download.

Fit, fill and stretch

When your target dimensions do not match the image's aspect ratio, something has to give. The three modes decide what:

• Fit — the whole image fits inside the box. Nothing is cropped; the result may be smaller than the box in one direction. Best when you must not lose any content.
• Fill — the image covers the box completely and the overflow is cropped from the edges. Best for thumbnails and square avatars, where a consistent frame matters more than the corners.
• Stretch — the image is squashed to the exact box. It will look wrong unless the ratios nearly match. Use only when you know you need it.

Why resampling quality matters

Downscaling is where cheap tools give themselves away. Throwing an 8000 px image into a single drawImage call at 800 px makes the browser sample roughly one pixel in a hundred, which produces aliasing on fine detail — moiré on fabric, jagged edges on text, sparkle on foliage.

This tool steps the image down in halves and finishes with a high-quality Lanczos pass, so every source pixel contributes to the result. Aspect ratio, transparency and EXIF orientation are preserved throughout.

Resize or compress?

They solve different problems and are often confused:

• Resizing changes how many pixels exist. It is the only way to make a 4000 px image display correctly in a 400 px slot.
• Compressing changes how many bytes those pixels take up, leaving the dimensions alone.

For web images you usually want both: resize to the largest size the layout actually shows, then compress. Doing it in that order gives a much better result than compressing a huge image.