Resize Image Online — Set Width, Height or Aspect Ratio
Part of Image tools: See all Image tools.
What is Image Resizer?
This free image resizer changes a JPG, PNG or WebP image to the exact width and height you need, up to 4096 pixels on each side. It can also center-crop the image to a fixed shape: 1:1 square, 4:3, 16:9, 3:4 or 9:16. Your image is uploaded over HTTPS, resized on our server and returned as a JPG. The upload is not kept.
How to use Image Resizer
- Click Upload image, or drag a JPG, PNG or WebP file onto the box. The tool shows its current size and fills in the Width and Height boxes.
- To keep the proportions, type the width you want and set Height to 0, or type the height and set Width to 0. Fill in both only when you want that exact size.
- Optional: choose a crop shape (1:1, 4:3, 16:9, 3:4 or 9:16). The center of the image is kept and the edges are trimmed.
- Click Resize & Download. The resized JPG downloads as yourfile_resized.jpg, and the tool shows its file size.
Why use this tool?
Websites, marketplaces and social networks expect images of a particular size and shape. If you upload the wrong one, they crop it for you, often cutting off a face or a product. Resizing first means you decide what is kept. It also turns a 4000-pixel phone photo into something that loads quickly.
How the image resizer works
When you choose a file, the tool shows its name, its size in pixels and its file size. It also fills in the Width and Height boxes with the current dimensions. Click Resize & Download and the image is uploaded to our server, which does three things in order:
- Turns the photo upright. Phones often save a portrait photo sideways with a “rotate” tag. The tool applies that tag first, so the result looks the way you saw it.
- Crops to a shape, if you chose one. With 1:1, 4:3, 16:9, 3:4 or 9:16 selected, it trims equal amounts from both sides, or from the top and bottom, so the center of the picture is kept.
- Resizes. With both Width and Height set, the image is scaled to exactly that size. With only one set and the other at 0, the missing side is calculated from the image's proportions. Resizing uses Lanczos resampling, which keeps edges clean when you shrink an image.
The result is saved as a JPG at quality 90 and downloads as yourfile_resized.jpg. Each side can be up to 4096 pixels.
Keeping the proportions (avoiding stretched photos)
Because the Width and Height boxes start filled in with the original size, the most common mistake is to change just one of them. Say a 4032 × 3024 photo is loaded and you type 1200 for the width, but leave the height at 3024. The tool then makes a tall, squashed 1200 × 3024 image. To keep the proportions, set the box you are not using to 0. Width 1200 and Height 0 gives 1200 × 900 for that photo.
If you need an exact size and a different shape, such as 1200 × 628 from a 4:3 photo, choose the nearest crop shape first, or accept that a little stretching will happen. The crop options are 1:1, 4:3, 16:9, 3:4 and 9:16.
Common sizes and how to get them
| Goal | Crop to aspect ratio | Width | Height |
|---|---|---|---|
| Square profile or product photo | 1:1 | 1080 | 0 |
| Widescreen 1920 × 1080 (HD) | 16:9 | 1920 | 0 |
| Video thumbnail 1280 × 720 | 16:9 | 1280 | 0 |
| Vertical story 1080 × 1920 | 9:16 | 1080 | 0 |
| Portrait 3:4, 1200 tall | 3:4 | 0 | 1200 |
| Website hero image, 1600 wide | None | 1600 | 0 |
Social networks and marketplaces change their recommended sizes from time to time, so check the platform's help page for the current numbers. The table shows how to enter any size you find.
Making images smaller vs. larger
Shrinking is where resizing helps most. A 12-megapixel phone photo (4032 × 3024) shown at 1200 pixels wide on a web page looks the same to visitors, and the file is a fraction of the size. Enlarging is allowed up to 4096 pixels, but resampling cannot invent detail that the camera never captured. A small image made twice as large will look soft. If you only have a small image, use it at its natural size or close to it.
Resize, then compress
Resizing changes the number of pixels. Compressing changes how heavily those pixels are encoded. For the smallest file that still looks good, resize to the size you will actually display, and then run the result through the Image Compressor if the file is still too heavy for an email or upload limit. Doing it in that order avoids compressing pixels that you are about to throw away.
Output details and limits
- Format: always JPG at quality 90. Need PNG or WebP? Run the result through the Image Format Converter.
- Transparency: transparent areas of a PNG or WebP are filled with white. For a logo with a transparent background, resize it in a tool that keeps PNG.
- Metadata: camera details, GPS location and other EXIF data are not copied into the new file, which is useful before you share a photo publicly.
- Crop position: crops are always centered. If your subject is off to one side, crop by hand first.
- One image at a time. Upload, resize and download, then choose the next file.
Privacy
Resizing happens on our server, not in your browser, so your image is uploaded over HTTPS. It is processed in memory for that one request and the JPG is sent straight back. We do not keep the upload or the result, and you do not need an account. If you need a transparent background removed before resizing a product photo, try the Background Remover.
Frequently asked questions
- How do I resize an image without stretching it?
- Enter only one dimension and set the other to 0, which means auto. For example, enter Width 1200 and Height 0, and the height is worked out to keep the original proportions. If you enter both numbers and they do not match the image's shape, the picture is stretched to fit.
- How do I make a square or 16:9 image?
- Choose 1:1 or 16:9 under Crop to aspect ratio. The tool first trims the edges evenly to that shape, keeping the center, and then applies any width or height you entered. For example, choose 1:1 with Width 1080 and Height 0 to get a 1080 × 1080 square.
- What format is the resized file?
- Always JPG, saved at quality 90. Transparent areas in a PNG or WebP become white, because JPG does not support transparency. If you need a PNG or WebP, convert the result with the Image Format Converter.
- What is the largest size I can resize to?
- Up to 4096 pixels for width and height. You can also make an image larger than the original, but enlarging cannot add detail, so the result looks softer.
- Do phone photos come out the right way up?
- Yes. The tool reads the rotation setting that phones save with a photo and turns the image upright before resizing. The rotation tag and other metadata, including camera details and GPS location, are not copied into the new JPG.
- Is my image stored?
- No. The image is uploaded over HTTPS, resized in memory for your request, and sent back to your browser. We do not keep a copy of the upload or the result.
Step-by-step guides
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