How to resize an image
- Click Choose an image, drag a file onto the box, or paste a screenshot with Ctrl+V (⌘+V on a Mac). JPG, PNG, WebP, GIF and BMP work, as does any other format your browser can display.
- Type a new Width or Height in pixels, or pick a Quick size: 75%, 50% or 25% of the original, or a width of 1920, 1280, 800 or 400 px. With Keep aspect ratio ticked, the other side follows automatically.
- Choose the output Format – JPG, PNG or WebP – and, for JPG and WebP, a Quality from 10% to 100% (80% by default).
- Check the preview and the line showing the new dimensions, file size and the change from the original, then click Download. The file keeps the original name with the new size added, such as
holiday-1920x1440.jpg.
Your image stays on your device
Resizing happens inside your browser using the HTML canvas: the file is read from your disk, redrawn at the new size and saved back to it. Nothing is uploaded, so it is safe for private photos and scanned documents, and it is fast even on a slow connection.
Worked examples
- A phone photo for email or the web. A 4032 × 3024 photo (12 megapixels) resized to 1920 px wide becomes 1920 × 1440, about 23% of the original pixel count. Saved as JPG at 80% quality, it is usually several times smaller and still looks sharp on most screens.
- A screenshot for a manual. A 2880 × 1800 screenshot from a high-resolution laptop at 50% becomes 1440 × 900. Keep it as PNG so text and edges stay crisp.
- A portrait photo at a fixed width. A 4000 × 6000 photo set to 1080 px wide becomes 1080 × 1620: with the aspect ratio kept, the height is 1080 × 6000 ÷ 4000.
- Planning a print. Print size depends on pixels per inch (PPI). At 300 PPI, a common target for photo prints, a 1800 × 1200 image prints at 6 × 4 inches (15.24 × 10.16 cm). Work out the pixels you need first, then resize to them.
Formats and quality
- JPG – the standard for photos. It is lossy: the quality setting trades fine detail for file size. Around 70–85% is usually hard to tell from the original; at low settings blocky artefacts appear around edges. JPG has no transparency, so transparent areas become white.
- PNG – lossless, so there is no quality slider. Best for screenshots, logos, diagrams and anything with text or transparency, but a photo saved as PNG is often far larger than the same photo as JPG.
- WebP – a newer format with both lossy compression and transparency, usually smaller than JPG at similar quality, and supported by all current major browsers. If your browser can't create WebP files, the tool saves a PNG and tells you so.
Why enlarging makes images blurry
Resizing never adds information. When you shrink an image, groups of pixels are averaged into fewer pixels, which looks clean; this tool reduces large images in several halving steps with high-quality smoothing to avoid jagged edges. When you enlarge one, the pixels in between have to be guessed from their neighbours. A 400 × 300 image stretched to 1600 × 1200 has 16 times as many pixels but no more detail, so it looks soft. Start from the largest original you have and resize down, not up.
The aspect ratio is the width divided by the height. Changing one side with Keep aspect ratio turned off stretches or squashes the picture. If you need a different shape, such as a square profile photo from a landscape shot, crop it first in a photo editor and then resize it here.
Tips
- Always resize from the original. Saving a JPG again and again loses a little quality each time.
- If the new file is larger than the original, you have probably turned a JPG into a PNG, chosen a very high quality or enlarged the image.
- For website images, the Screen Resolution page shows your device pixel ratio; on a ratio-2 screen, an image needs about twice its displayed width in pixels to look sharp.
- To embed a small icon directly in HTML or CSS, turn the resized file into a data URL with Base64 Encode / Decode.
FAQ
Is the photo's metadata kept?
No. The new file has no EXIF data such as the camera model, the date taken or the GPS location, which is good for privacy when sharing. Browsers apply the photo's orientation when they open it, so the saved copy should still be the right way up.
Can it open iPhone HEIC photos?
Only if your browser can display HEIC, which most browsers other than Safari can't. Otherwise export the photo as JPG first, or set the iPhone to Settings › Camera › Formats › Most Compatible.
What happens to animated GIFs?
Only the first frame is used, so the result is a still image.
Is there a size limit?
The output can be up to 50 megapixels, for example 8000 × 6000. On phones with little memory, very large images can still fail; if the file can't be created, try a smaller size.