Image Resizer
Resize images by exact pixels, percentage, or longest side.
Drop an image here or click to upload
Free online image resizer — no upload required
Resize any image to exact pixel dimensions, a percentage of the original, or constrain by the longest side. All processing happens in your browser — your images never leave your device.
Frequently asked questions
- Does image resizing reduce quality?
- Resizing always involves some quality trade-off. Enlarging (upscaling) degrades quality as pixels are interpolated. Downscaling generally looks clean. Use PNG output for lossless quality; JPEG/WebP with 85%+ quality is usually indistinguishable from the original.
- What is the maximum image size I can resize?
- There is no hard limit — it depends on your device's available RAM. Very large images (over 50 MP) may be slow on mobile. The tool processes everything in-browser using the Canvas API.
- How do I maintain aspect ratio?
- Enable the lock icon between width and height. Changing one dimension automatically calculates the other to keep the original aspect ratio. The 'Max side' mode also automatically maintains aspect ratio.
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