Free Tool
Compress images for the web without losing quality
Control exactly how much quality you trade for file size — before/after comparison included.
The problem
Slow-loading images hurt SEO, Core Web Vitals scores, and user experience. But "just compress everything" isn't a good answer — aggressive compression makes product photos and hero images look blurry and unprofessional.
The NSS solution
The NSS Image Compressor gives you a quality slider and a real-time before/after size comparison. Drag to find the exact point where file size is minimal but quality remains sharp. Download JPEG or WebP, all in your browser.
How to use it
- 1
Optimise product photos for e-commerce
Amazon, Shopify, and Etsy product images need to load fast without looking compressed. JPEG 80–85 is typically the sweet spot for product shots.
- 2
Reduce blog image file sizes
Blog hero images are often exported from design tools at much higher quality than needed. Compress to under 200 kB before publishing.
- 3
Prepare social media assets
Instagram, LinkedIn, and Facebook have file size limits and compress uploads themselves. Pre-compressing to the right size prevents double-compression artefacts.
- 4
Archive size reduction
When storing large libraries of photos, compressing to WebP at quality 75–80 can reduce storage by 60–70% with no visible difference at web viewing sizes.
- 5
Email attachment optimisation
Email clients and servers often have file size limits. Compress images to under 500 kB before attaching to client-facing emails.
Step-by-step guide
- 1
Upload your image
Drag a JPG or PNG into the Image Compressor. WebP and AVIF are also accepted as input.
- 2
Choose your output format
JPEG for photos that don't need transparency; WebP for web delivery where you want smaller files or transparency support.
- 3
Adjust the quality slider
Start at 80 and move left until you see visible degradation, then move back right. The before/after shows original vs compressed side by side.
- 4
Check the size reduction
The tool shows original size, compressed size, and percentage saved. Aim for 50–70% reduction for web use.
- 5
Download
Your compressed file downloads directly — no email, no cloud, no waiting.
Common questions
What quality setting should I use?
For JPEG: 75–85 is the practical sweet spot for most images. For WebP: 65–80 gives equivalent visual quality to JPEG at smaller file sizes.
Will compression affect my transparent PNG?
Yes — JPEG doesn't support transparency. Use WebP if you need lossy compression with transparency preserved. PNG compression (lossless) is handled separately by the PNG Optimizer.
How small can I go?
Below quality 60, most images show visible blocking and colour banding. It's rarely worth the quality loss for anything that needs to look professional.
Is this the same as the PNG Optimizer?
No. The PNG Optimizer uses lossless compression (no quality loss at all, but smaller size reduction). The Image Compressor uses lossy compression (larger size reduction, small quality trade-off).
Ready to try it?
No account. No subscription. No images uploaded to any server.
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