Image aspect ratio converter
Crop or pad an image to a standard ratio: 1:1 square, 4:5 portrait, 16:9 widescreen, 9:16 vertical and more. Move the crop to frame the subject, or pad with a colour or blur to keep the whole picture.
- Price
- Free, no account
- Runs
- In your browser
- Uploads
- None. Files stay on your device
Open an image, pick a ratio, then drag the frame to choose what stays.
How to use it.
Open an image
PNG, JPEG or WebP. The original stays untouched; you download a new file.
Pick a ratio
Choose one of the common ratios or type your own, such as 21:9.
Crop or pad
Crop cuts the image to the ratio: drag the frame to choose what stays. Pad keeps the whole image and fills the rest with a colour or a blurred copy.
Download
Saves a PNG or JPEG at the largest size the source allows, or at a fixed width you set.
Common image ratios.
Width to height. The pixel sizes are common exports, not the only valid ones: any size with the same proportions has the same ratio.
| Ratio | Shape | Common sizes (px) | Used for |
|---|---|---|---|
| 1:1 | Square | 1080 × 1080, 2048 × 2048 | Square: profile pictures, product thumbnails, feed posts |
| 4:5 | Portrait | 1080 × 1350 | Portrait feed posts |
| 3:4 | Portrait | 1080 × 1440, 1536 × 2048 | Portrait photos, tablets |
| 2:3 | Portrait | 1000 × 1500, 4000 × 6000 | Portrait photos (35 mm film), posters, pins |
| 9:16 | Portrait | 1080 × 1920 | Vertical video, stories, phone wallpapers |
| 4:3 | Landscape | 1024 × 768, 1600 × 1200 | Older screens, compact cameras, slides |
| 3:2 | Landscape | 1500 × 1000, 6000 × 4000 | Landscape photos (35 mm film, most DSLRs) |
| 16:9 | Landscape | 1280 × 720, 1920 × 1080, 3840 × 2160 | Video, presentations, desktop screens, thumbnails |
| 21:9 | Landscape | 2560 × 1080, 3440 × 1440 | Ultrawide screens, cinematic banners |
| 1.91:1 | Landscape | 1200 × 628, 1200 × 630 | Link previews and landscape ad images |
What an aspect ratio is.
An image's aspect ratio is its width divided by its height, written as two whole numbers. A 1920 × 1080 image is 16:9; so is 1280 × 720. Changing the ratio means either cutting part of the image away (crop) or adding space around it (pad); stretching it distorts the picture.
To find a ratio from pixel sizes, divide both by their greatest common divisor: 1080 × 1350 divides by 270 to give 4:5. To find a size for a ratio, fix one side and scale the other: a 4:5 image 1080 wide is 1080 × 5 ÷ 4 = 1350 tall.
Make the source image.
Generating images? Windpaint returns images in ten aspect ratios directly, from 1:1 to 21:9, so there is nothing to crop.
Questions.
What is a 1:1 image?
A square image, as wide as it is tall, such as 1080 by 1080 pixels. It is the default for profile pictures, product thumbnails and many social posts.
What is a 4:5 image?
A portrait image four units wide and five tall, such as 1080 by 1350 pixels. It takes more vertical space in a feed than a square.
What size is a 16:9 image?
Common 16:9 sizes are 1280 by 720, 1920 by 1080 and 3840 by 2160 pixels. It is the standard ratio for video, slides and desktop screens.
How do I change an image's aspect ratio without cropping?
Use Pad. The whole image is kept and the extra space is filled with a solid colour or a blurred, enlarged copy of the image.
How do I work out an aspect ratio from pixel sizes?
Divide width and height by their greatest common divisor. 1920 by 1080 divides by 120 to give 16:9. The tool shows this for any image you open.
Does my image get uploaded?
No. Cropping and padding happen on a canvas in your browser, and the file is saved straight to your device.