How to Resize an Image to Exact Pixel Dimensions
Make a picture exactly 1200 × 800, 600 pixels wide or any size a form or website asks for — with or without keeping its proportions. Free, no upload.
3 min read ·
To resize an image to an exact size, open the Image Resizer, add the picture, type the Width and Height in pixels, and download the result. Keep the aspect ratio locked to avoid stretching, or unlock it when you need precise dimensions regardless of shape — though for that, cropping first gives a better result, as explained below.
Resize an image step by step
- Open the Image Resizer and add your image (JPG, PNG, WebP, BMP and other common formats).
- Under Dimensions (Pixels), enter the Width, the Height, or both.
- Keep the aspect ratio lock on to change one dimension and have the other follow automatically. Turn it off to set both freely.
- Optionally set a Target File Size in KB, or leave it blank.
- Choose the Output Format: Same as Original, JPG, PNG or WebP.
- Process the image, check the preview, and download it.
Keep the proportions — or crop first
Every image has a shape: a phone photo is usually 4:3 or 3:4, a screenshot often 16:9. If the size you need has a different shape, there are three options:
| Option | Result |
|---|---|
| Resize with the lock on | Correct shape, but one side won't exactly match |
| Resize with the lock off | Exact size, but the picture is stretched or squashed |
| Crop to the right shape, then resize | Exact size and no distortion — part of the edge is trimmed |
The third option is almost always the right one. Crop the picture to the target's proportions with the Image Cropper or the Aspect Ratio Tool (for example 3:2 for 1200 × 800), then resize to the exact pixels.
Common sizes people need
- Website images: 1200–1920 pixels wide for full-width pictures, 600–800 for images inside text.
- Email newsletters: 600 pixels wide is the usual maximum.
- Profile pictures: usually square — 400 × 400 or 800 × 800.
- Online forms: whatever they state, often with a file-size limit too (see below).
- Social media: each platform has its own sizes; the Social Media Image Resizer produces them all at once.
Making images bigger
Resizing up works, but it can't invent detail: a 400-pixel photo enlarged to 1600 pixels looks soft. For photos that need to be larger and sharp, use the AI Image Upscaler, which reconstructs detail with AI.
Size in pixels versus size in KB
Pixels are the picture's dimensions; KB is the file's size on disk. They're related but not the same — a 1000 × 1000 photo can be 80 KB or 800 KB depending on compression. When a form says "maximum 100 KB", reducing the pixels helps, but the reliable way is to compress to the limit with Compress Image to KB. The resizer's Target File Size option does a similar job if you need both a size and a limit.
Resizing many images at once
For a folder of product photos or a batch of pictures for a website, the Bulk Converter & Resizer resizes dozens of images to the same dimensions in one go and downloads them as a ZIP.
Which output format?
- JPG for photos — small files, universally accepted.
- PNG for screenshots, logos and graphics with sharp edges or transparency.
- WebP for websites — smaller than both at similar quality.
- Same as Original when you just want the size changed.
Frequently asked questions
Is my image uploaded?
No. Resizing happens in your browser, so personal photos stay on your device.
Does resizing reduce quality?
Making an image smaller keeps it sharp. Making it larger can look soft; saving as JPG adds slight compression.
Can I resize a photo on my phone?
Yes. The tool works in Safari and Chrome on phones; the resized image goes to your Downloads folder or Files app.