AI Image Upscaler
Increase image resolution 2× or 4× using Swin2SR super-resolution AI. All processing happens locally in your browser — your images are never uploaded anywhere.
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Swin2SR super-resolution AI — runs entirely in your browser
How it works
- Drop any JPG, PNG, WebP, or AVIF image
- 2× — AI super-resolution using Swin2SR (~47 MB model, downloads once and caches)
- 4× — AI 2× upscale followed by bicubic 2× for 4× total output (faster than full AI 4×)
- Large images are split into tiles processed sequentially — real-time ETA shown
- Output is always lossless PNG to preserve every detail
Common use cases
Print enlargement
Scale small digital files to print-ready resolution for posters, banners, and canvas prints.
Product photography
Enhance low-resolution product images to meet e-commerce platform requirements.
Old photo restoration
Bring clarity and detail back to scanned or low-resolution vintage photographs.
Social media content
Upscale cropped or compressed images to maintain quality at full display size.
Game asset upscaling
Improve texture resolution for retro games or indie projects without manual redrawing.
Thumbnail quality
Enlarge YouTube or blog thumbnails while keeping them sharp for all screen sizes.
Frequently asked questions
Is my image uploaded to a server?
No. The Swin2SR AI model downloads once to your browser and all processing happens locally. Your image never leaves your device.
What's the difference between 2× and 4×?
2× doubles width and height using the Swin2SR AI model. 4× runs a 2× AI pass then a 2× bicubic pass on top, giving 4× total — slightly faster than a full AI 4× and very close in quality.
What formats can I export?
Always lossless PNG, which preserves every detail the upscaler adds. You can convert to WebP or JPEG using the Format Converter tool after.
Will it work on large images?
Yes. Large images are split into overlapping tiles, each processed sequentially. You'll see a real-time progress estimate during processing.
Want to upscale a video?
2× and 4× Lanczos upscaling for MP4 and WebM clips — now live.
Related tools
Why it's different
Most upscalers run on servers and charge per image. NSS uses Swin2SR running entirely in your browser — private, free, no upload.
100% Private
Everything runs on your device using in-browser AI. Nothing is transmitted to any server — not the file, not metadata, not filenames.
True Alpha Channel
We export straight (non-premultiplied) alpha so transparent PNGs open with a real checkerboard in Photoshop and Figma — no black halos.
Free Forever
No paywall, no watermark, no premium tier. The full-quality AI is free, supported by non-intrusive ads.
Works Offline
Once loaded, the app and AI models cache locally. Process files without an internet connection. Installable as a desktop or mobile app.
Ready to try it?
Free, private, no signup.
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