Upscale video to 4K on your own PC – with AI or the classic way, in one clear workflow. Plus a guard that keeps an eye on your GPU. One-time purchase, no subscription, no cloud.
Two ways to the goal – and a guard that makes long, unattended runs possible.
Real-ESRGAN for photos and live footage when detail matters – or classic Lanczos when you need it fast.
Target resolution up to 4K/UHD (3840×2160). The model reconstructs edges and surfaces instead of just enlarging.
Encodes to HEVC/H.265 on the GPU, with a selectable quality up to "very high" (CQ 17).
Colour space and HDR are set automatically to match; deinterlacing is applied where needed.
The audio track is carried over unchanged – no re-encoding, no loss of sound quality.
A guard pauses the upscaling when the graphics card gets too hot and resumes once it has cooled down. Long runs without worry.
The most common job – video cleanly to 4K – no subscription and no yearly fee.
| Klarschliff VideoUpscaler | Topaz Video AI | |
|---|---|---|
| Price | €39 one-time | approx. $299 one-time |
| Ongoing cost | none | approx. $99/year for continued updates |
| Upscale to 4K / UHD | ✓ Real-ESRGAN (AI) & Lanczos | ✓ several AI models |
| GPU temperature guard | ✓ pauses on overheating | — |
| HEVC/H.265 on the GPU | ✓ up to CQ 17 | ✓ |
| Operation | one clear, focused workflow | extensive pro interface |
| Scope | focused on upscaling | very broad: also interpolation, denoise, stabilisation |
| Free trial | ✓ first 30 seconds | ✓ preview/trial |
Honestly: Topaz Video AI is the more comprehensive pro tool. Klarschliff VideoUpscaler does the most common job – getting video cleanly to 4K – for a fraction of the price, with no subscription and no yearly fee. If that's exactly what you need, the choice is easy.
Topaz pricing: as of October 2026, without guarantee · Topaz Video AI is a trademark of Topaz Labs, Inc. · no affiliation or partnership implied.
The demo upscales the first 30 seconds – with every method and setting.