Resize Image by Percentage
Sometimes you do not care about exact pixels — you just want the picture at half size. Pick a percentage and every image in the batch scales by the same factor, aspect ratio untouched.
Drop your image here
or
Choose ImageYou can also paste an image with Ctrl+V
Images are processed on your device and never uploaded.
• •
Runs on your device — nothing is uploaded.
Working…
0%
- Original
- Result
- Saved
- Quality
How to resize by percentage
- Select one or more images.
- Drag the slider or tap 25%, 50% or 75%.
- The resulting pixel dimensions are shown before you commit.
- Press Resize and download.
What a percentage actually costs
Percentages apply to each side, so the pixel count falls by the square:
| Scale | Pixels remaining | 4032×3024 becomes |
|---|---|---|
| 75% | 56% | 3024 × 2268 |
| 50% | 25% | 2016 × 1512 |
| 25% | 6% | 1008 × 756 |
| 10% | 1% | 403 × 302 |
File size does not follow quite as steeply, because compression efficiency changes with resolution — but 50% scaling typically produces a file around a third of the original.
Why percentage beats pixels for batches
If a folder contains a mix of landscape and portrait shots at different resolutions, a fixed pixel target treats them inconsistently. A percentage applies the same relative reduction to all of them and never crops anything.
Resampling quality
Downscaling is where cheap tools give themselves away. Throwing an 8000 px image
into a single drawImage call at 800 px makes the browser sample roughly
one pixel in a hundred, which produces aliasing on fine detail — moiré on fabric,
jagged edges on text, sparkle on foliage.
This tool steps the image down in halves and finishes with a high-quality Lanczos pass, so every source pixel contributes to the result. Aspect ratio, transparency and EXIF orientation are preserved throughout.
Frequently asked questions
Are my images uploaded to your server?
No. The image is decoded, processed and re-encoded by your own browser using the Canvas and Web Worker APIs. There is no upload endpoint for this tool — open your browser's network panel while you use it and you will see no request carrying image data.
Can I use a percentage above 100?
Yes, up to 400%. Bear in mind that enlargement cannot recover detail that the sensor never recorded, so the result will be softer than the original.
Are fractional percentages allowed?
Yes — 37.5% works. The final pixel dimensions are rounded to whole numbers and shown before you press the button.
What happens to my file when I close the tab?
It is gone. The image only ever exists in your browser's memory as an object URL; closing or refreshing the page discards it. Nothing is written to our servers, and nothing is stored on your device unless you download the result.