What this tool does
The Image Resizer changes the pixel dimensions of a photo while preserving its content. You can enter exact pixel values, or enter inches and pick a print resolution (DPI) — the tool converts inches to pixels automatically. This is the correct workflow when you need a photo that prints at a specific physical size, such as a passport photo or a 4×6 print.
How to resize an image
- Choose an image from your device.
- Pick a unit: px for screen use, in for print.
- Enter the width and height. If "Keep aspect ratio" is ticked, changing one value updates the other.
- For print, pick a DPI. 300 DPI is standard for high-quality prints; 150 DPI is acceptable for drafts.
- Choose the output format and click Resize image, then download.
Pixels vs inches and DPI
A pixel is a single dot on a screen or print. An inch is a physical measurement. DPI (dots per inch) tells the printer how many pixels to squeeze into each inch of paper. A 300 DPI 4×6 inch photo therefore needs 1200 × 1800 pixels. If you resize a photo to 4×6 inches at 300 DPI, you get a file that prints sharply. If you pick 72 DPI, the printer will stretch 288 × 432 pixels across 4×6 inches and the result will look blurry.
Keeping aspect ratio
Aspect ratio is the ratio of width to height. Changing it without keeping the ratio will stretch or squash the photo. With "Keep aspect ratio" enabled, the tool locks the ratio so the subject stays undistorted. If you need to fill a specific canvas shape without distortion, crop first (using our Image Cropper) and then resize.
Print presets
The preset dropdown fills in the exact inch dimensions for common print sizes: passport (2×2 in), 4×6 photo, 5×7 photo, and A4. Combined with the DPI selector, these give you a correctly sized print file in two clicks.
Common questions
Does resizing up lose quality? Yes. Enlarging a small image cannot add detail that was never captured. A 200×200 pixel image resized to 2000×2000 will look soft. Always start from the highest-resolution original you have.
Is the image uploaded? No — everything happens locally in your browser.
Can I resize many images at once? Yes, use Bulk Image Processing.