How to resize an image
- Drop one or more images, paste one with Ctrl+V, or click Choose files.
- Pick By percent, By pixels or Longest side and enter the size.
- Click Resize images and download each result or all of them as a ZIP.
How it works
Your browser decodes each image, draws it onto a canvas at the new size and encodes it again. Photos taken sideways are turned upright first using their EXIF orientation, so a portrait shot never comes out lying down.
Longest side is the easiest choice for a mixed batch: set 1920 and landscape photos become 1920 px wide while portrait photos become 1920 px tall, with proportions kept. By pixels is for forms that demand an exact size such as 600 × 600; leave one field empty and the other is calculated.
What we measured
We resized 9 public sample photos from the scikit-image project (451 to 1,411 px wide, 6,072 KB in total as PNG) to 50 % in Chrome on a 4-core test computer. The batch took 0.38 seconds and the results came to 2,371 KB.
Halving width and height leaves a quarter of the pixels, which is why the files shrink so much. Phone photos are much larger than these samples, so expect each one to take longer, but the work still happens on your device.
When to use it
Shrinking photos before attaching them to an email or chat. Meeting a size rule on a job site, exam registration or online shop (for example 1000 × 1000 product images). Making a set of blog pictures the same width. Preparing a profile picture.
If the file is still too heavy after resizing, continue with Compress Image. To put the resized photos into one document, use Image to PDF.
Limits
- Enlarging cannot add detail: a small image scaled up looks soft. That’s why “Don’t enlarge smaller images” is on by default.
- Animated GIFs are saved as a still image of the first frame.
- Metadata such as camera model and GPS location is not copied to the new file, which is usually a plus for privacy.
- With Keep original, AVIF and unusual formats are saved as JPG.
Frequently asked questions
Are my photos uploaded?
No. Resizing runs in your browser with the canvas API. You can even disconnect from the internet after the page loads.
Will the image be stretched?
Not unless you ask for it. Percent and longest side always keep proportions. With pixels, keep Keep aspect ratio checked; uncheck it only if you really need an exact width and height.
How many images can I resize at once?
There is no fixed limit. Dozens of photos work fine; the limit is your device’s memory.
Which size should I use for the web?
1920 px on the longest side looks sharp on full-screen displays; 1200 px is plenty for blog posts; 1080 px is a common size for social media posts.