Image Resizer

Resize JPG, PNG and WebP images by exact pixels or percentage, keep the aspect ratio, and download the result. Free and private.

Choose an image

Drag and drop a file here, or click the button. PNG, JPG, WebP, GIF, BMP or SVG, up to 30 MB.

Your image stays on your device. It is resized in your browser and never uploaded.

About This Tool

NinjaFunction's Image Resizer changes the width and height of any picture in seconds. Type an exact size in pixels or choose a percentage, keep the aspect ratio so nothing is stretched, pick PNG, JPG or WebP, and download the result with its new file size shown. Quick width buttons cover common sizes such as 1920 and 1280 pixels. The image is resized in your browser, so it is never uploaded to a server.

🔑 How to Use

Choose an image. Click Select image, drag a file onto the box, or try the sample picture.
Pick how to resize. Use Pixels to type an exact width or height, or Percent to make the image a share of its original size.
Keep the aspect ratio ticked so the picture is not stretched. Change one number and the other follows.
Choose a format. It starts with the same format as your image. Pick JPG or WebP for smaller files.
Click Resize image, check the preview and file size, then click Download.

💡 Pro Tips

✔ Use the quick widths for common sizes such as 1920 or 1280 pixels.
✔ Make images smaller, not bigger. Enlarging makes a picture blurry.
✔ Keep your original. Resize a copy so you can always go back.
✔ Need a different shape? Resize first, then use the Image Cropper to cut it to size.

Common Image Sizes

Websites and apps ask for different sizes. These are popular ones, but platforms change them from time to time, so check the current size before you upload.

Use	Size in pixels
Full HD screen or video	`1920 × 1080`
YouTube thumbnail	`1280 × 720`
Instagram square post	`1080 × 1080`
Instagram or Facebook story	`1080 × 1920`
Website share image (Open Graph)	`1200 × 630`
LinkedIn banner	`1584 × 396`
Profile picture or app icon	`512 × 512`

If the shape does not match, for example a wide photo for a square post, resizing alone will stretch it. Crop it to the right shape first with the Image Cropper.

Resize, Compress or Convert?

Resize changes the number of pixels. Use it when an image is too big for a page, an email or a form.
Compress keeps the pixels but makes the file smaller. Use the Image Compressor when the size is right but the file is too heavy.
Convert changes the file type, for example PNG to JPG. Use the Image Converter for that.

For the best result, resize first and compress last. Resizing alone often cuts the file size a lot, because a smaller picture has fewer pixels to store.

Tips for Sharp Results

Start from the biggest, best original you have, and make copies from it.
Reduce the size in one go instead of resizing several times in a row.
For screenshots, text and logos, save as PNG so the edges stay crisp.
For photos on the web, a JPG or WebP quality of 80 to 90 percent looks almost the same and gives a much smaller file.

Frequently Asked Questions

How do I resize an image without losing quality?

Make the image smaller rather than larger, keep the aspect ratio locked, and save it as PNG or at a high JPG or WebP quality. Making an image smaller keeps it sharp. Making it larger cannot add detail that is not there, so it will look soft.

What does keep the aspect ratio mean?

The aspect ratio is the shape of the picture: its width compared with its height. When it is kept, changing the width also changes the height by the same amount, so the picture is not stretched or squashed.

What is the difference between resizing and compressing?

Resizing changes how many pixels the image has. Compressing keeps the pixels but stores them in a smaller file. A smaller image is usually a smaller file too, but to shrink a file without changing its size, use the Image Compressor.

Which format should I save my image in?

Use JPG for photos, PNG for logos, screenshots and images with transparent areas, and WebP for the smallest files on websites. The tool starts with the same format as your original image.

Why does my PNG get a white background when I save it as JPG?

JPG cannot store see-through areas, so they are filled with white. Save as PNG or WebP to keep the transparency.

Is there a size limit?

You can open files up to 30 MB. The new image can be up to 16,000 pixels on each side, as long as your browser has enough memory to create it.

Is my image uploaded to a server?

No. The image is resized in your browser, so it never leaves your device and nothing is stored after you close the page.