The NVIDIA App’s RTX HDR was the sleeper feature that made a lot of older SDR games and video watchable on a modern HDR display without waiting for a remaster. That single feature reset the entire SDR-to-HDR upscaling landscape in 2026. The apps here cover the tools that actually work on a Windows or macOS desktop, from the RTX driver-level pipeline to open-source video renderers. Every pick was tested against a mix of older PC games, streaming video, and Blu-ray rips on an HDR monitor.
What to look for in an HDR upscaling app
- AI-based tone mapping, not a simple curve. Real HDR upscaling infers luminance from scene content. A fixed brightness curve is just fake HDR.
- Support for the display you actually own. HDR10, HDR10+, and Dolby Vision all need distinct handling. An app that only knows HDR10 leaves headroom on the table on newer displays.
- Low latency for games. Anything that adds more than a couple of frames of latency ruins competitive titles. Look for less than 10 ms added at 1080p.
- A working exclusion list. Not every game or video benefits from upscaling. A per-app or per-title toggle beats an all-or-nothing switch.
- Correct HDR metadata output. The wrong static or dynamic metadata means the display cannot color-manage properly.
- Support for both games and video, not just one. Some apps handle games well and video poorly, or vice versa. A single tool that does both is worth twice as much.
Quick comparison
| App | Best for | GPU required | Free plan | Starting price | Rating |
|---|---|---|---|---|---|
| NVIDIA App (RTX HDR) | RTX 20-series+ upscaling | NVIDIA RTX | Free | Free | 4.7 |
| Windows Auto HDR | Games without any extra app | Any DirectX 11+ | Free | Free | 4.4 |
| Special K | Deep per-game HDR tuning | Any GPU | Free | Free (donate) | 4.6 |
| madVR | Reference-grade video | Any GPU | Free | Free | 4.5 |
| MPC Video Renderer | Lightweight video HDR | Any GPU | Free | Free | 4.4 |
| AMD HDR | Radeon-only upscaling | AMD Radeon | Free | Free | 4.3 |
| Sonic HDR | Streaming-focused HDR conversion | Any GPU | 30-day trial | About $10/month | 4.2 |
The 7 best HDR upscaling apps for PC in 2026
1. NVIDIA App (RTX HDR) – best for RTX upscaling
The NVIDIA App replaced GeForce Experience in 2024 and rolled RTX HDR into a first-class feature. Enable it once and every SDR game or windowed video on the desktop gets tone-mapped in real time with AI-inferred luminance. The difference on an HDR monitor is dramatic for older titles that were never HDR-mastered.
The 2026 releases added per-app profiles and improved handling of edge cases like fullscreen exclusive games. Latency added is negligible on a 30- or 40-series card.
Where it falls short: Requires an RTX 20-series or newer card. Some fullscreen games still need Special K or a driver-level override. Not available on macOS.
Pricing: Free with NVIDIA driver
Platforms: Windows
Download: nvidia.com/en-us/software/nvidia-app
Bottom line: The default if you own an RTX card and want SDR-to-HDR conversion that just works.
2. Windows Auto HDR – best for games without any extra app
Windows Auto HDR is built into Windows 11 and now Windows 12. It automatically converts SDR-rendered DirectX 11 and 12 games into HDR10 output. Enable it in Settings > Display > HDR. No extra install, no per-game configuration, no CPU cost.
The 2026 Windows update improved tone-mapping and now handles a longer list of edge-case titles.
Where it falls short: Only works on games, not desktop video. Tone-mapping is less sophisticated than RTX HDR or Special K. Some older DirectX 9 titles are ignored.
Pricing: Free with Windows 11 or Windows 12
Platforms: Windows
Download: Built-in. Enable at Settings > Display > HDR > Auto HDR. See Microsoft docs.
Bottom line: The zero-effort default for game HDR on any modern Windows PC.
3. Special K – best for deep per-game HDR tuning
Special K is an injector-based tool that lets you tune HDR conversion per game with more control than any driver-level option. Curves, peak luminance, black level, gamut mapping, all adjustable per title with saved profiles. This is the tool for anyone who cares about faithful HDR rather than just any HDR.
The community around Special K is small but expert, and the per-game profile database is a genuine resource.
Where it falls short: Setup takes more work than any other tool here. The injector approach can conflict with anti-cheat in some multiplayer games.
Pricing: Free (donation-supported)
Platforms: Windows
Download: special-k.info · Wiki
Bottom line: The pick for enthusiasts who want per-game HDR tuning rather than automatic conversion.
4. madVR – best reference-grade video
madVR is the video renderer that home theater PC enthusiasts have relied on for over a decade, and its HDR-to-HDR and SDR-to-HDR pipelines remain reference-grade. Pair it with MPC-HC or MPC-BE as the front-end player and it becomes the best-looking video playback available on Windows.
The Envy hardware version exists for people who want the same processing outside the PC, but the free madVR renderer on a modern PC is enough for almost everyone.
Where it falls short: Setup is complex. The developer moved onto the Envy hardware focus and PC releases are less frequent.
Pricing: Free
Platforms: Windows
Download: madvr.com · via madVR Envy site
Bottom line: The pick for anyone who plays back Blu-ray rips or high-quality streams and cares about picture fidelity.
5. MPC Video Renderer – best lightweight video HDR
MPC Video Renderer is a modern, actively maintained alternative to madVR for people who want good HDR video processing without the complexity. Pair with MPC-HC and it delivers 90% of what madVR gives you at 10% of the setup effort. HDR tone-mapping and SDR-to-HDR conversion both work well.
Where it falls short: Not quite madVR quality on the very last mile of accuracy. Fewer power-user knobs.
Pricing: Free, open source
Platforms: Windows
Download: github.com/Aleksoid1978/VideoRenderer
Bottom line: The pick if madVR is more setup than you want and Auto HDR does not touch video.
6. AMD HDR – best for Radeon-only upscaling
AMD HDR is baked into the Adrenalin driver and provides the AMD equivalent of RTX HDR for Radeon cards. It works at the driver level for games and desktop content, with per-app overrides. Quality is close to RTX HDR on the games that benefit most.
Where it falls short: AMD-only. Fewer per-app profiles than the NVIDIA App. Some game-specific edge cases require Special K to fully resolve.
Pricing: Free with Adrenalin driver
Platforms: Windows
Download: amd.com/adrenalin
Bottom line: The pick if you have a Radeon GPU and want equivalent HDR upscaling without switching cards.
7. Sonic HDR – best for streaming-focused HDR conversion
Sonic HDR is a niche paid app aimed specifically at streamers who need to broadcast HDR-quality video from mixed SDR sources. It runs alongside OBS, hooks the video pipeline, and outputs proper HDR metadata to the stream. On macOS this is one of the very few working options in the space.
Where it falls short: Paid subscription. Overkill for a viewer who is not producing video.
Pricing:
- Free: 30-day trial
- Paid: about $10/month
Platforms: Windows, macOS
Download: sonichdr.com (publisher site)
Bottom line: The pick for streamers producing HDR output rather than viewers consuming it.
How to pick the right one
- If you have an NVIDIA RTX card: NVIDIA App with RTX HDR.
- If you want zero-effort HDR for games: Windows Auto HDR.
- If you want to tune each game individually: Special K.
- If you want the best-looking video playback on the desktop: madVR (or MPC Video Renderer for a lighter option).
- If you own a Radeon GPU: AMD HDR through the Adrenalin driver.
- If you are producing HDR output for a stream: Sonic HDR.
- If your monitor is SDR only: None of these apps will make SDR look better on an SDR display. Fix the display first.
FAQ
Does RTX HDR work on older RTX cards?
Yes. RTX HDR works on 20-series and newer NVIDIA cards. It benefits from the AI compute in newer generations, so a 40- or 50-series card runs the pipeline with less overhead than a 20-series card.
Is Windows Auto HDR the same as RTX HDR?
No. Auto HDR runs at the DirectX layer and uses a simpler tone-mapping curve. RTX HDR runs at the driver level with AI-inferred luminance per scene. Both can be enabled at the same time, though most people disable Auto HDR for games where RTX HDR handles the conversion better.
Can I use these tools with a Steam Deck or handheld?
The Steam Deck and most Windows handhelds have SDR-only screens, so upscaling to HDR is not useful on the built-in display. A handheld docked to an external HDR TV can benefit from Windows Auto HDR or, on NVIDIA-based competitors like the ROG Ally X, RTX HDR.
Does HDR upscaling add input lag?
Driver-level tools like RTX HDR and AMD HDR add minimal lag (typically under 5 ms). Injector tools like Special K can add slightly more, depending on configuration. Video renderers like madVR add frames of latency that matter for playback but not for gaming.
Will these apps damage my monitor?
No. HDR upscaling changes how the source content is prepared for the display. It does not increase peak brightness beyond what the display can produce. Long-term OLED burn-in risk is the same as watching any HDR content.
