Image Resizer
Resize images in your browser — no upload to server, fully private.
Why it matters
Oversized images are the #1 cause of slow page loads
Google uses page speed as a ranking factor, and images are usually the heaviest element on any page. A 4MB hero image that could be 200KB after proper resizing is directly hurting your Core Web Vitals scores — and your search rankings.
Beyond SEO, oversized images kill mobile experiences. Over 60% of web traffic comes from mobile devices, where bandwidth is limited and patience is thin. Resizing images to appropriate dimensions before publishing is one of the highest-impact optimizations you can make.
Features
What you get with Image Resizer
Client-side processing
All resizing happens in your browser using the Canvas API. No image is uploaded to any server — your photos and graphics stay completely private.
Aspect ratio lock
Maintain your image proportions by default. Enter one dimension and the other adjusts automatically to prevent stretching or distortion.
Output format control
Choose between JPEG, PNG, and WebP output formats. WebP delivers smaller file sizes with comparable quality — recommended for web publishing.
Quality slider
Adjust compression quality from 1-100 to find the right balance between file size and visual quality for your use case.
When to use Image Resizer
Resize product images for e-commerce listings
Optimize blog featured images for faster page loads
Prepare social media profile and cover photos to exact dimensions
Compress email newsletter images to reduce send size
Resize screenshots for documentation and presentations
Create thumbnails from larger source images
FAQ
Common questions about Image Resizer
Is my image uploaded to a server?
No. All processing happens in your browser using JavaScript. Your image never leaves your device. This is why the tool works offline once loaded.
What image formats are supported?
The tool accepts JPEG, PNG, GIF, BMP, and WebP input. You can output to JPEG, PNG, or WebP regardless of the input format.
Will resizing reduce image quality?
Reducing dimensions (e.g., from 4000px to 1200px) has minimal quality impact on screens. Reducing the quality slider or converting to WebP with compression does reduce quality slightly — but the file size savings are usually worth it for web use.
What dimensions should blog images be?
For featured images, 1200×630px is ideal (matches Open Graph/social media dimensions). For in-content images, 800-1200px wide is usually sufficient. For thumbnails, 400×300px works well.
Ready to level up your SEO?
Use Leafpad and supercharge your content strategy today
Leafpad automates the tedious parts of SEO content creation, so you can focus on what matters - creating amazing content and growing your audience.