Compress images online
Reduce file size up to 90%. Convert to WebP, JPG, or PNG.
Drop images here
or click to browse
Files never leave your browser
Output format
Choose WebP, JPG, or PNG.
Compress images online
Compress images online, instantly.
Reduce image file size up to 90% without losing quality. Convert to WebP, JPG, or PNG in bulk. For max speed, try the WebP optimizer. No uploads — everything runs locally in your browser.
Perfect for web developers, designers, and bloggers who need to optimize images for faster websites.
How it works
Three steps to smaller files
Drop your files, tune your settings, and download instantly. No login, no waiting.
Upload locally
Drag and drop images into the glass panel. Everything stays on your device.
Pick quality + format
Adjust the quality slider and choose WebP, JPG, or PNG output.
Download instantly
Save each file with the correct filename and extension, ready for the web.
Features
Modern, minimal, and surprisingly powerful
Built for speed and clarity, NanoJPG helps you compress images online without the usual clutter.
Privacy-first by design
All processing stays in your browser. No uploads, no tracking, no server storage.
Bulk image compressor
Handle multiple files in one pass, with clear results and quick downloads.
Quality you control
Dial the slider to balance sharpness and size for every project.
Lightning-fast output
Client-side compression keeps everything instant and responsive.
Format comparison
Pick the best output for your workflow
WebP wins for speed, JPG keeps photos light, and PNG is best for transparency. Want to focus on Core Web Vitals? Explore the WebP conversion page.
Who uses NanoJPG
Image optimization for every workflow
From freelance designers to e-commerce teams, NanoJPG helps professionals compress images online without compromising quality.
Web developers
Optimize images for faster page load times and better Core Web Vitals scores.
Graphic designers
Export client work in multiple formats without bloated file sizes.
E-commerce stores
Compress product photos in bulk for faster storefronts and better SEO.
Bloggers & content creators
Reduce image size for WordPress, Medium, or any CMS without quality loss.
Marketing teams
Prepare social media assets and email graphics at optimal file sizes.
Agencies & freelancers
Process client images securely without uploading to third-party servers.
Privacy
Local processing means total control
NanoJPG never uploads your files. Compression happens entirely in your browser, so your images stay private and secure.
FAQ
Quick answers
Everything you need to know before you compress images online.
How do I compress images without losing quality?
Use the quality slider to find the sweet spot between file size and visual quality. At 80% quality, most images look identical to the original while being 60-90% smaller.
Is this image compressor really free?
Yes, NanoJPG is completely free to use. There are no limits on file size or number of images. Everything runs in your browser with no account required.
Do my images get uploaded to a server?
Never. NanoJPG processes everything locally in your browser. Your images never leave your device, making it perfect for sensitive or confidential files.
Can I compress multiple images at once?
Yes. Drop multiple files or even a ZIP archive for instant batch compression. Download all results as a single ZIP with folder structure preserved.
What is the best format for web images?
WebP offers the best compression for modern websites — up to 30% smaller than JPG with similar quality. Use JPG for photos and PNG when you need transparency.
How much can I reduce image file size?
Typically 60-90% depending on the original image and quality settings. A 5MB photo can often be reduced to under 500KB while maintaining excellent quality.
Does NanoJPG work offline?
Yes. After the first page load, NanoJPG works completely offline since all processing happens in your browser.
Can I use this on my phone or tablet?
Absolutely. NanoJPG is fully responsive and works great on mobile devices. Tap to select files or use drag-and-drop on supported browsers.
Works offline
No internet? No problem.
Install NanoJPG as an app and use it anywhere — even without internet connection.
Install as app
Add to your home screen or desktop for instant access. Works just like a native app.
100% offline capable
Once loaded, all tools work without internet. Your images never leave your device.
Lightning fast
No server uploads means instant processing. Resize hundreds of images in seconds.
Completely private
Everything runs in your browser. No data sent anywhere, ever.