Image Resizer Pro
Resize by pixels or percentage with the aspect ratio locked — locally in your browser
Inputs
Results update liveUpload Image
Click to select an image
Processed locally, never uploaded
Interpretation
How Image Resizing works
The resizer redraws your image onto a canvas at the target dimensions — by exact pixels or as a percentage — with optional aspect-ratio lock, then exports as PNG (lossless), JPEG or WebP. Pixel dimensions are exact; final file size depends on content and format.
Example
Worked example
A realistic scenario showing how the calculation guides a practical decision.
Worked example
input4032×3024px photo (12 MP)
operationpercentage resize to 25%
result1008×756px — fits a standard content column
What it means: The aspect ratio (4:3) is preserved automatically, so nothing is stretched. A quarter of each edge means roughly 1/16 of the pixels — far lighter for readers to download.
Watch out
Common mistakes
- Upscaling beyond the original dimensions does not add detail — the image just gets bigger and softer. If you need a larger image, start from a higher-resolution source.