Image Resizer
Resize images to any dimension. Scale by percentage or exact pixels.
Click to select an image
Supports JPEG, PNG, WebP
Quickly resize images to specific dimensions or scale by percentage. Maintain aspect ratio or set custom sizes. Perfect for social media, thumbnails, or web optimization.
Resizing an image sounds trivial until you have to match an exact pixel target, preserve aspect ratio, and avoid visible softness from a poor resampling algorithm. This tool handles all three in the browser: you can scale by percentage, type in width and height, or lock the aspect ratio so the other dimension fills in automatically. The canvas-based resample uses bilinear smoothing, which is the same algorithm Photoshop's "Bilinear" option runs.
The most common reason to resize is to fit a specific constraint — a 1200x630 Open Graph image, a 400x400 avatar, a 1080px-wide blog header, or a thumbnail under 100 KB. Oversized images hurt page speed and Core Web Vitals scores, and upload forms often reject files above a size cap. Downscaling in the browser is lossless in the sense that no server sees your photo, and the resampling quality is high enough for production web use.
For upscaling beyond the original resolution, expect blurriness — no browser-based tool can invent detail that isn't there. Use an AI upscaler if you need to go larger than the source.
- 1
Upload an image
Drop a file onto the uploader or select one from disk. JPEG, PNG, WebP, and GIF all work, and the current dimensions display immediately.
- 2
Set new dimensions
Enter target width and height in pixels, or use the percentage slider to scale proportionally. Keep the aspect-ratio lock on to prevent stretching.
- 3
Download the result
Preview the resized image and download it in the original format. File size and new dimensions are shown before you save.
Social media sizing
Match exact platform requirements — 1200x630 for Facebook link previews, 1080x1080 for Instagram posts, 1500x500 for Twitter headers.
Web page optimization
Shrink oversized hero images before they hit your CDN so mobile visitors don't download 5 MB when 300 KB is enough.
Avatar and thumbnail prep
Create 400x400 profile pictures or 150x150 thumbnails from a larger source photo without opening a desktop editor.
Upload-form compliance
Bring an image below a portal's pixel or file-size limit — common for government forms, job applications, and LMS uploads.
Does resizing reduce image quality?
Downscaling preserves visible quality — you're throwing away pixels you didn't need. Upscaling looks blurry because the browser has to invent pixels, and no amount of interpolation fixes that.
Is my image sent to a server?
No. The resize runs on a canvas in your browser. The file never leaves your device, which matters if you're handling client photos, IDs, or internal screenshots.
What formats are supported?
JPEG, PNG, WebP, and GIF input and output. Transparency is preserved for PNG and WebP; GIF animation is flattened to the first frame.
How do I keep the aspect ratio?
Leave the aspect-ratio lock enabled and only edit one dimension — the other updates automatically. Turn it off if you need a non-proportional stretch.
What's the maximum image size it handles?
Most browsers handle images up to roughly 20–30 megapixels smoothly. Very large RAW-sized images may cause the tab to slow down — downscale in two passes if needed.