- Choose Image — Click Choose Image and select a photo (JPG/PNG/WebP).
- Pick Scale — 1×–4×. Larger scales = bigger output.
- Enhance — Multi-step upscale + edge-preserving sharpen in linear color space.
- Fine-tune — Amount (strength), Radius (edge size), Threshold (noise guard).
- Download — Save the enhanced PNG.
Tips: For tiny originals, try 3×–4×, Amount 140–180%, Radius 1.4–1.8. For already-sharp images, lower Amount or raise Threshold.
Troubleshooting
- Upload doesn’t respond? This build falls back to an
<img>loader if your browser blockscreateImageBitmap. - Noisy result? Increase Threshold or reduce Amount.
- Edge halos? Lower Radius (e.g., 1.2→0.9).
- Download blocked? Allow downloads for this page or try another browser.
Shortcuts: ? open guide · Esc close