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How to Use Image Resizer: Complete Guide (2026)
Learn how to use image resizer free online — no signup, no download. Follow our step-by-step guide below.
What is Image Resizer?
Resize images to exact dimensions with fit modes (cover, contain, stretch). Supports JPG, PNG, WebP, and AVIF output formats. Maintains aspect ratio or stretches to fit. All processing uses Sharp (server-side) for high-quality resampling.
- 100% browser-based — no data uploaded to servers
- Free to use — no signup required
- Instant results — no waiting
- Works on all devices — mobile, tablet, desktop
How to Use Image Resizer: Step-by-Step
- 1
Upload an image
Drag and drop an image or click to browse.
- 2
Set target size
Enter target width and height in pixels. Choose fit mode: Cover (crop), Contain (letterbox), or Stretch.
- 3
Choose output format
Select JPG, PNG, WebP, or AVIF. Set quality (for lossy formats).
- 4
Resize and download
Click Resize. Preview and download the result.
Common Use Cases
Social media images
Resize images to exact dimensions required by Twitter, Instagram, Facebook, LinkedIn.
Web optimization
Generate multiple sizes from a single source image for responsive srcset.
Print preparation
Resize images to print resolution (300 DPI) from screen resolution (72 DPI).
FAQ About Image Resizer
What fit mode should I use?
Cover = crop to fill (may cut off edges). Contain = fit inside (may add letterbox). Stretch = force exact dimensions (may distort).
What is the best output format?
WebP = smallest file size with good quality. AVIF = even smaller but less browser support. JPG = max compatibility. PNG = only if you need transparency.
Is my image data private?
Images are processed server-side (using Sharp). They are not stored permanently. Uploaded images are deleted after processing.
Ready to Try Image Resizer?
No signup. No download. 100% free.