Free Image Resizer

Downsizing (making smaller) typically preserves quality well using our bicubic resampling algorithm. Upsizing (making larger) will reduce quality—you cannot add detail that wasn't in the original. For best results: (1) always start with the highest resolution original; (2) avoid repeated resizing; (3) save final images at appropriate quality settings; (4) never upsize beyond 150-200% of original dimensions.

Maintain aspect ratio: if original is 4000x3000 (4:3 ratio) and you set width to 800, height becomes 600 automatically (maintains 4:3). Exact dimensions: setting 800x800 on a 4:3 image will crop or distort to force a square. Use aspect ratio for general resizing, exact dimensions when you need specific crops (profile pictures, thumbnails).

Yes, but consider DPI (dots per inch). For quality prints: 300 DPI is standard. A 4"x6" photo needs 1200x1800 pixels (4×300 by 6×300). For large posters viewed from distance, 150 DPI suffices. Digital displays use 72-96 DPI. Converting pixels to print size: divide pixels by DPI. A 3000x2000 image at 300 DPI = 10"x6.67" print.

Completely safe. All image resizing happens locally in your browser using the Canvas API. Your photos never get uploaded to servers or accessed by anyone. Perfect for resizing private photos, sensitive documents, business graphics, or any confidential visual content. Works offline after the page loads.