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Image Resizer
A free tool to resize images to any dimension. Supports JPG, PNG, WebP, and GIF. Drag & drop or upload, set your target size, and download instantly. 100% private — your images never leave your browser.
Last updated: June 2026 · Free · No sign-up required
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Drag & drop an image here
or browse files
Quick reference
| Common target | Pixels |
|---|---|
| Instagram post | 1080 × 1080 |
| YouTube thumbnail | 1280 × 720 |
| Full-HD wallpaper | 1920 × 1080 |
| Twitter/X header | 1500 × 500 |
| Web hero (2x retina) | 2400 × 1200 |
Interpretation guide
| Operation | Quality impact |
|---|---|
| Downscale | Safe — detail is averaged away cleanly |
| Upscale | Soft/blurry — pixels are invented |
| Aspect change without lock | Distortion — keep the lock on |
Formula & methodology
Formula: Locked ratio: height = width × (orig H ÷ orig W); canvas resample to target pixels
- Drop an image — processing is local, nothing uploads.
- Enter the target width or height; the aspect lock computes the other side to avoid distortion.
- The canvas resampler produces the exact-pixel output for download.
Worked example: a 4000×3000 photo resized to width 1200 gives 1200×900 with the lock on; forcing 1200×600 without the lock would visibly squash it.
Frequently asked questions
How do I resize an image without distorting it?
Keep the aspect-ratio lock on: set one dimension and the tool computes the other from the original proportions. Distortion only happens when both dimensions are forced independently.
Does resizing reduce file size?
Dramatically — file size scales roughly with pixel area. Halving both dimensions cuts pixels 4×, typically shrinking the file 60–75%. Pair with the Image Compressor for maximum savings.
Can I enlarge a small image?
You can, but quality suffers — upscaling invents pixels, producing softness. Modest enlargements (≤1.5×) pass; beyond that consider AI upscalers built for the job.
Is my image uploaded anywhere?
No — resizing happens in your browser via the canvas API. Private images stay on your device throughout.
What size should web images be?
No wider than their largest display size ×2 for retina: content images ~1600 px wide max, thumbnails at exact slot size. Oversized images are the #1 page-weight mistake.