How to use the image resizer
- Drop one or more images onto the drop zone or click to choose them.
- Choose Pixels or Percentage. In pixel mode, keep the lock on to preserve proportions.
- Pick an output format and, for JPEG or WebP, a quality.
- Click Resize and download each image or all of them as a ZIP.
Worked example
Fitting a 4000 x 3000 photo into 1920 x 1080
With the aspect ratio locked and a 1920 x 1080 box, the photo becomes 1440 x 1080: the height is the limiting side (1080 ÷ 3000 = 0.36, and 4000 x 0.36 = 1440). At 50%, the same photo becomes 2000 x 1500.
How it works
Large reductions are done in steps, halving the image until it is less than twice the target, then resizing to the exact size with the browser's high quality smoothing. This avoids the jagged, over-sharp results of a single big downscale. With the ratio locked in a batch, each image fits inside your width x height box keeping its own proportions.
Assumptions
- Enlarging an image cannot add detail; the tool warns when a result is larger than the source.
- Re-encoding removes EXIF metadata. Phone photos are saved upright.
Frequently asked questions
Are my files uploaded?
No. Images are processed in your browser on your own device and are never sent to our server. The page keeps working if you go offline after it loads.
What does the lock button do?
With one image, changing the width updates the height to keep the same proportions, and vice versa. With several images, each is fitted inside the width x height box. Unlocked, images are stretched to exactly the size you type.
Which format should I choose?
JPEG or WebP for photos, PNG for graphics, screenshots or images with transparency. "Same as original" keeps each file's format (GIF is saved as PNG).
Does resizing reduce quality?
Downscaling discards pixels by design, and JPEG or WebP output is lossy. PNG output is lossless at the new size.
Limitations
- Images up to 50 MB each are accepted. Very large images (tens of megapixels) depend on device memory, and iPhones and iPads limit canvases to about 16.7 megapixels.
- Animated GIFs are saved as a single still frame.
- Maximum output size is 20,000 pixels per side, lower on phones.