Image Resizer
Resize images to exact dimensions right in your browser. Lock aspect ratio, choose output format (JPEG, PNG, WebP) and quality. No upload required.
PNG, JPG, WebP — processed locally in your browser
How to use
- 1 Upload your image by clicking "Choose an image" or dragging and dropping it into the upload area.
- 2 Enter the target width and height. Toggle the lock icon to preserve the original aspect ratio automatically.
- 3 Pick a quick preset (HD 720p, FHD 1080p, Twitter, OG Image…) or use 50% to halve the original size.
- 4 Select the output format (JPEG, PNG, WebP) and adjust quality — note: quality only applies to JPEG and WebP, PNG is always lossless.
- 5 Click "Resize & Download" — the resized image is saved directly to your device with nothing uploaded to any server.
Key features
- Drag & drop or click-to-upload — supports PNG, JPG, and WebP
- Aspect ratio lock keeps proportions intact when you change one dimension
- One-click presets: HD 720p, FHD 1080p, Square 1:1, Twitter, OG Image, and 50% scale
- Choose JPEG, PNG, or WebP output with adjustable quality slider for lossy formats
- 100% client-side — your image never leaves your browser, nothing is uploaded
What is Image Resizing?
Image resizing changes the pixel dimensions of an image — width and height — while preserving (or optionally discarding) the original aspect ratio. Unlike cropping, which removes content from the edges, resizing scales the entire image up or down.
This tool performs all resizing entirely inside your browser using the Canvas API — no image is ever uploaded to a server. You can choose between JPEG, PNG, and WebP output formats, adjust quality for lossy formats, and lock the aspect ratio to avoid distortion.
Common Use Cases
Web performance optimisation
Resize large camera photos (4000×3000px) to web-friendly dimensions (1920×1080 or smaller) before uploading — dramatically improving page load speed.
Responsive image sets
Generate multiple sizes of the same image (large, medium, small) for responsive picture or srcset attributes — perfect for art direction and bandwidth optimisation.
Social media posts
Resize images to match platform-specific dimensions: Twitter banners, LinkedIn headers, Instagram posts, or OG image previews.
E-commerce product photos
Standardise product images to uniform dimensions (e.g. 800×800px square) for a consistent grid layout across your store.
Email-friendly images
Resize images to recommended email widths (600–800px max) to ensure they render correctly across email clients without horizontal scrolling.
Thumbnail generation
Create uniform thumbnails for blog posts, video galleries, or portfolio grids — consistent dimensions create a clean, professional layout.
Social Media Image Size Reference
Resize your images to match each platform's recommended dimensions.
| Platform | Use | Optimal size |
|---|---|---|
| Twitter / X | Post image | 1600 × 900 px |
| Twitter / X | Header banner | 1500 × 500 px |
| Feed post (square) | 1080 × 1080 px | |
| Feed post (portrait) | 1080 × 1350 px | |
| Stories / Reels | 1080 × 1920 px | |
| Profile banner | 1584 × 396 px | |
| Post image | 1200 × 627 px | |
| Feed post | 1200 × 630 px | |
| Cover photo | 851 × 315 px | |
| YouTube | Thumbnail | 1280 × 720 px |
| YouTube | Banner | 2560 × 1440 px |
| OG / Social preview | Open Graph image | 1200 × 630 px |
Choosing the Right Output Format
JPEG
Best for photos and complex images without transparency. Adjustable quality (10–100%) lets you balance file size and visual fidelity. Smaller files than PNG at equivalent quality.
PNG
Lossless compression with transparency support. Ideal for screenshots, logos, graphics with sharp edges, and images that need a transparent background. Larger files than JPEG.
WebP
Modern format supporting both lossy and lossless compression plus transparency. Up to 30% smaller than JPEG at the same quality. Supported by all modern browsers.