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Set width, height, or both. Lock aspect ratio. Choose output format. Compress. Download. All in your browser - or batch-process folders with the desktop app.
Resizing and compressing are two different things - but they're almost always done together.
You resize to specific dimensions, then compress to the optimal file size for delivery.
FastCompressor's image resizer handles both steps in one: resize to exact pixel dimensions, choose your output format, and apply compression - all in your browser, all offline, nothing uploaded.
Social media has specific image size requirements.
LinkedIn posts: 1200x627px.
Instagram: 1080x1080px.
Twitter/X: 1200x675px.
FastCompressor resizes to exact pixel targets - not approximate 'small/medium/large' options.
Resize to a specific width and FastCompressor automatically calculates the correct height to maintain your image's original proportions.
Or set both dimensions for exact cropping.
E-commerce teams don't resize one product image.
They resize 200.
FastCompressor's desktop app batch-resizes entire folders to a consistent specification.
Resizing before compressing is more efficient than compressing then resizing - fewer pixels means less data to compress.
FastCompressor does both in sequence automatically.
Built for professionals who need speed, privacy, and quality.
Learn how it works
Why image resizing matters more than most developers think
Serving an image at 400x300 pixels that's actually 4000x3000 pixels forces the browser to download 10x more data than it needs, then scale it down visually. This wastes bandwidth, slows page load, and directly impacts your Core Web Vitals "Largest Contentful Paint" score.
Google's Lighthouse flags "Properly size images" as one of its top performance recommendations - and it specifically checks whether images are served at the size they're displayed. A hero image displayed at 1200px wide but uploaded at 4000px wide is a Lighthouse error.
FastCompressor's image resizer handles this properly:
Pixel-perfect resizing - Set exact output dimensions. Aspect ratio lock prevents distortion. Useful for e-commerce product images with required dimensions (Shopify: 2048x2048, Amazon: 1000x1000 minimum).
Percentage resizing - Reduce to 50%, 25%, or any percentage. Useful for quickly creating thumbnail versions of existing images.
Maximum dimension resizing - Set a maximum width or height. The resizer scales down proportionally without cropping. Useful for standardising a folder of images to a consistent maximum size.
All resizing happens in your browser. The output is available immediately as a download. For batch resizing - entire product photo libraries, press kit images, or social media asset sets - use the FastCompressor desktop app.
See why teams choose FastCompressor
| Feature | FastCompressor | Typical Online Tool |
|---|---|---|
| Exact pixel control | Yes - width + height | Presets only |
| Aspect ratio lock | Yes | Sometimes |
| Batch folder resize | Unlimited (Pro) | 1-20 files |
| Format conversion | Yes - JPG/PNG/WebP | Limited |
| No upload | Yes | No |
| Price | $19 once | $5-79/month |
Exact pixels · Aspect ratio lock · Batch folders · No uploads · 30-day guarantee
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