Image Tools
Image Resizer
Resize an image to exact pixel dimensions.
🔒 Runs entirely in your browser — nothing here is ever uploaded
CalcoTools · Image Resizer · generated 8/23/2026, 1:04:46 PM
About the Image Resizer
Resizes an uploaded image to exact pixel dimensions directly in your browser, with an option to lock the aspect ratio so the image doesn't distort.
How to use it
- Upload an image.
- Enter a Width or Height in pixels (locked to the aspect ratio by default).
- Click Resize image, then download the result.
Formula
Uses the HTML canvas element to redraw the original image at new width and height values, resampling pixel data to fit the target dimensions.
Worked example
A 3000×2000 photo resized to 1500 pixels wide, with aspect ratio locked, automatically becomes 1500×1000.
Recommendations
- • Locking the aspect ratio prevents stretching or squashing — uncheck it only if you specifically want to distort proportions.
- • Enlarging beyond the original resolution doesn't add real detail; it stretches existing pixels, which can look soft.
- • The whole process runs locally in your browser — your image is never uploaded anywhere.
Frequently asked questions
Shrinking generally preserves quality well; enlarging beyond the original size can look softer since there's no new detail to add, only interpolation.
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