Image Resizer
Resize any image to exact pixel dimensions — right in your browser, privately. Set a target width and height, or lock the aspect ratio and change one side, then download the resized image instantly.
What is an image resizer?
An image resizer changes the pixel dimensions of a picture — its width and height — to a target size. This is one of the most common image tasks on the web, because most platforms place limits on the dimensions they accept. A hero banner, product photo, social media post and email signature each need different dimensions, and a single huge original rarely fits all of them.
When you resize, the browser reads the image, redraws it onto a canvas at the requested width and height, and exports the result in the selected format. The default is PNG, and you can also keep the aspect ratio: with that option on, changing the width automatically recalculates the height so your image is never stretched or squashed.
Because this tool runs locally in your browser, your photo never leaves your device — there is no upload, no processing queue and no account to create.
How to use the image resizer
- Click Choose an image and select the file.
- Enter a new width and height in pixels, or keep Keep aspect ratio on and set just one dimension.
- Watch the live preview update as you type, then click Download resized image.
Example
A 4000×3000 photo weighing 4.8 MB is resized to 1200×900 with the aspect ratio locked. The tool ships a ~450 KB image that is perfectly proportioned for a blog header and loads in a fraction of the time.
Who is this image resizer for?
- Creators and designers: They size platform-perfect uploads — square, portrait or story — without cropping, so the full photo fits its slot.
- Marketers: They resize ad banners and social previews to exact dimensions to match what each network renders.
- Developers: They scale images to a specific width and height for an API, a hero slot, or a responsive breakpoint.
- Photographers: They resample large RAW-style exports down to a web-friendly size before sharing or uploading.
Common image dimensions
| Dimensions | Aspect | Megapixels | Typical use |
|---|---|---|---|
| 1080 × 1080 | 1:1 | 1.17 MP | Instagram square / profile |
| 1080 × 1350 | 4:5 | 1.46 MP | Instagram portrait feed |
| 1200 × 628 | 1.91:1 | 0.75 MP | Social share / Open Graph |
| 1920 × 1080 | 16:9 | 2.07 MP | Full-HD hero image |
| 2560 × 1440 | 16:9 | 3.69 MP | QHD wallpaper |
| 3840 × 2160 | 16:9 | 8.29 MP | 4K media thumbnail |
Common use cases
- Standardise hero, banner and blog images to fixed dimensions.
- Match the exact pixel size required by a social media platform or ad network.
- Shrink oversized photographs so they upload faster and use less bandwidth.
- Create consistent thumbnails or product images for a store or gallery.
Pro tips
- Leave Keep aspect ratio on unless you deliberately want to distort the image.
- For the web, roughly 1200–1600px wide is a strong default; about 300px for thumbnails.
- Downscaling loses sharpness that cannot be recovered, so resize downward for best results.
- Pair a resize with compression to get the smallest possible file for the web.
FAQ
Is the image resizer free?
Yes — free and unlimited, with no signup and no watermark.
Does resizing keep the aspect ratio?
Yes — tick the “Keep aspect ratio” box so the image scales proportionally and is not distorted.
Does resizing an image lose quality?
Downscaling removes detail, so a smaller image is slightly softer. Resizing up can only interpolate — it cannot add real detail.
What size should I resize to for the web?
800–1600px wide is a good default for most pages; around 300px for thumbnails and 1920px for full-screen heroes.
What format does the resizer output?
It produces a PNG by default, which keeps the resized image lossless.
Can I resize by percentage instead of pixels?
Enter the width you want and keep the aspect ratio on — the height recalculates so you can scale proportionally.
Do my images stay private?
Yes. Resizing runs entirely in your browser, so your images never leave your device.
How do I make the file really small after resizing?
Resize down to a sensible width, then run the result through an image compressor for the best balance.
What is the best image size for social media?
1200×630 px for link previews, 1080×1080 px for square Instagram posts, and roughly 1920 px wide for YouTube thumbnails or full-width heroes.
Can I resize multiple images at once?
This version resizes one image at a time, so repeat the steps for each photo you need to change.
Related image tools
- Image CropCrop a photo to any area or aspect ratio.
- Image CompressorShrink file size without visible quality loss.
- Aspect Ratio CalculatorFind the correct ratio for any width and height.
- Image RotateRotate or flip an image by angle or mirror.
- Increase Image Size (KB)Add weight to an image to exceed a KB minimum.
- All Image ToolsConverters, compressors & more — full hub.
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