Image Resizer
Resize images to the exact width and height you need — by pixels or percentage, with aspect ratio locked by default. Everything happens in your browser.
To resize an image, upload it, enter a target width, height or percentage (aspect ratio locked by default), and download the resized image — all in your browser.
Drop your files here, or choose files
Resize images to exact pixel dimensions, social presets, or a percentage scale.
Zero Server Uploads
Files process in local RAM
Instant WASM Speed
No waiting queues or lags
Unlimited Batching
Convert files without limits
Suggest a Feature or Improvement for Image Resizer
Need custom options, higher limits, or extra format support? Let our engineering team know!
How to use Image Resizer
- 1Upload a JPG, PNG or WebP image.
- 2Enter a target width or height, or use a percentage; keep the ratio locked to avoid distortion.
- 3Pick an output format and quality.
- 4Download the resized image.
How it works
Upload an image, enter a target width or height (or a percentage), and it's resized on your device using a high-quality canvas scaler with a live preview. Keep the aspect ratio locked to avoid distortion, or unlock it to stretch to exact dimensions.
Choose your output format and quality, then download.
Common uses
Fitting an image to a maximum width for a website or email, preparing an avatar or thumbnail, shrinking a photo before uploading to a form with size limits, or hitting an exact pixel size like 1080×1080.
Format comparison
| Resize (fewer pixels) | Compress (same pixels) | |
|---|---|---|
| What changes | Width & height in pixels | Quality / encoding only |
| Effect on size | Largest single saving | Moderate saving |
| Effect on sharpness | Matches display size — looks crisp | Softens detail at low quality |
| Best for | Images shown small (web, email, avatars) | Keeping full dimensions, smaller file |
Resizing to the size you actually display beats compression alone — and you can do both together.
Input & output compatibility
Accepts
- JPG / JPEG
- PNG
- WebP
Produces
- Same format, resized to your target width/height
Aspect ratio is locked by default so images don't stretch; enlarging past the original adds pixels but not real detail, so it can look soft.
Real file-size examples
The same 12 MP photo (4000 px wide) saved as JPG q80 at descending widths — pixel count is the biggest lever on file size:
12 MP photo → common web widths
Most photos are displayed far smaller than they're stored. Resizing to the width you'll actually show (often ≤ 2000 px) shrinks the file dramatically with zero visible loss — the single most effective optimisation.
When should you use each format?
Not sure what width to resize to? Pick by where the image will appear:
Common problems & solutions
Enlarged image looks blurry
Scaling up can't invent detail that isn't there. For bigger-and-sharper, use the Image Upscaler (AI) instead of a plain resize.
Image looks stretched or squashed
Keep the aspect-ratio lock on. If you need exact dimensions with a different ratio, crop first, then resize.
Not sure what dimensions to use
Match the display: ~2000 px for full-width, ~1200 px for content images, ~400–800 px for thumbnails. Check the whenToUse guide below.
Is this private?
This image resizing runs entirely in your browser using the built-in canvas and WebAssembly engine. Your files are read from local memory, processed on your own device, and never uploaded to a server.
Because nothing leaves your machine, there is no upload wait, no queue, and no copy of your image sitting in someone else's storage. Closing the tab discards everything — we keep no logs of the files you open and have no account system that could retain them.
That also means it works offline once the page has loaded, and there is no per-file limit imposed by an upload quota — the only ceiling is your device's available memory.
Frequently Asked Questions
Are my images uploaded to a server?
No. Every conversion runs locally in your browser using your device's own processor. Your images never leave your computer or phone, and nothing is stored on our servers.
Will resizing distort my image?
Not if you keep the aspect ratio locked (the default) — setting one dimension scales the other proportionally. Unlock it only if you intend to stretch to exact dimensions.
Can I make an image larger?
Yes, but enlarging past the original resolution can look soft, since there's no extra detail to add. Downscaling always stays crisp.
Which formats can I output?
You can keep the original format or export the resized image as JPG, PNG or WebP, with a quality control for the lossy formats.