Recommended Free Tools
To make modern emulators look more like a CRT, enable a shader preset in RetroArch, start with integer scaling, and add effects such as scanlines, phosphor masks, bloom and curvature only as your hardware and display allow. For a low-power device such as a Raspberry Pi, begin with a lightweight preset; use CRT-Royale when you have the graphics headroom and a high-resolution screen that can show its finer details.
What makes a CRT shader look convincing?
A CRT effect is a combination of image-processing techniques, not simply dark horizontal lines. Libretro describes shader presets as attempts to reproduce aspects of cathode-ray-tube displays, with results shaped by the preset, its settings, the source resolution, scaling and your display.
- Scanlines add or modulate horizontal structure associated with a raster display.
- Phosphor masks simulate the repeating colored structure of aperture-grille, slot-mask or shadow-mask displays.
- Bloom and halation approximate light spreading around bright image areas.
- Curvature and bezel geometry warp and frame the image to suggest a rounded tube face.
- Interlacing and NTSC processing can reproduce aspects of broadcast-era video and signal artifacts.
These effects are stylized approximations, not a reproduction of every electrical, optical or motion characteristic of a physical television. CRT-Royale, for example, models phosphor bloom by adding blur to spread brightness after a mask is applied; real CRTs also vary substantially. See Libretro’s CRT shader documentation and its CRT-Royale documentation.
Which CRT shader preset should you choose?
Choose according to your device’s graphics performance and the resolution of the screen you use. Lightweight presets trade some complexity for a better chance of running smoothly on weaker hardware; a demanding multi-pass preset offers more room for visual adjustment.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
#1 Best Overall
- Bright, clear picture: Bring entertainment to life on our 24" flat screen TV with bright 720p HD—perfect for bedrooms, kitchens, and beyond. Roku Smart Picture cleans up incoming TV signals, optimizes them, and chooses the right picture mode.
- Seamless streaming: With fast Wi-Fi and apps that launch in a snap, Roku Select Series TVs get you to your entertainment quickly. You get excellent picture quality, clear sound, automatic updates, and more. It’s simple to use. Hard to outgrow.
- TV, simplified: With setup that only takes minutes, a simple-to-navigate Home Screen, and an uncluttered remote control that does all you need—Roku makes it easier to watch the TV you love.
- A world of free entertainment: Enjoy a huge selection of free live TV, news, sports, movies, shows, and much more—all just a click away.
- More streaming, less searching: With personalized picks right on your Home Screen, quick access to the sports and entertainment you watch most, and fast and easy search in one place—the days of endless scrolling are over.
| Preset or approach | Visual character and tuning | Performance and resolution guidance |
|---|---|---|
| zfast-crt | A lightweight starting point for a basic CRT-style effect. | Intended for weaker hardware; exact performance depends on the device and settings. Libretro does not state a specific resolution target in the cited guidance. |
| crt-blurpi | A lightweight CRT treatment. | Libretro describes it as designed to run full speed on Raspberry Pi hardware and gives guidance for screens at 640×480 or less. That is configuration guidance, not a guarantee for every setup. |
| crt-pi | A practical lightweight option, particularly for a Raspberry Pi setup. | Libretro’s guidance targets 4:3 screens at 1080p. Actual performance varies with the device and configuration. |
| CRT-Royale | Highly customizable, with more complex mask, bloom and other CRT-style details. | More computationally demanding. Its documentation discusses 1440p and 4K-class displays for rendering phosphor-mask detail; a high-resolution display is useful, but does not ensure a particular result or frame rate. |
The comparisons above reflect Libretro’s documented guidance, not a benchmark across devices. Explore the preset descriptions and CRT-Royale’s notes on mask detail before choosing. At lower output resolutions, an intricate mask may not be clearly resolved; at higher resolutions it has more pixels available to render.
Set up a CRT shader in RetroArch
RetroArch supports GLSL and Slang shader formats, can stack shader passes, and lets you adjust parameters and save tuned presets. The documented workflow is:
Rank #2
- 13-inch combo TV/DVD player; measures 14.25 x 15 x 14.4 inches (W x H x D)
- Compatibility with DVD movie, CD audio,CD-R/CD-RW, DVD-R, and VCD discs
- JPEG Viewer enables you to create slideshows with digital photos stored on disc
- Digital coaxial audio output connects to your multi-channel audio/video receiver for surround sound content
- Glow-key remote control, icon-based on-screen displays, V-chip, and an auto-clock
- Update the shader packs using Main Menu → Online Updater.
- Launch the game or other content you want to play.
- Open Quick Menu → Shaders.
- Select Load Shader Preset and choose a preset. Libretro’s shader introduction gives
shaders_glsl/crt/crt-geom.glslpas an example. - Adjust the available parameters until the image suits your screen and preference.
- Save your tuned settings as a new preset so your changes can be reused.
Menu labels and available presets can depend on your RetroArch setup and installed shader pack. For format and preset details, see Libretro’s shader introduction.
Get cleaner scanlines with scaling and gradual tuning
Integer scaling generally produces cleaner, more regular repeating scanline effects because source pixels map to whole numbers of output pixels. Start there before increasing shader complexity. Then change one group of effects at a time: tune scanlines and sharpness first, and add curvature, mask and bloom gradually. This makes it easier to spot when a setting dims the image too much or blurs details you want to keep.
Do these 3 things before closing this tab:
1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteRank #3
- 1:10.1"TV screen is full HD
- 2:Small TV built-in, ATSC tuner to receive your favourite local free-to-air TV programmes
- 3:Main formats compatible with the TV's USB port: AVI, MOV, MPEG 1, MPEG 2, MPEG 3, MPEG4, XVID, AVC, MP4, H.264, HEVC(H.265), FLV, MKV, MP3, JPEG, WMV, RMVB, AVI, MKY, 3GP
- 4:HDMI and AV inputs:This portable TV offers enhanced compatibility with a wide range of devices.Sync up to HD 1080P video from your to this TV via HDMI/AV cable (not included). You can also connect many other devices to this small TV, such as DVD player, TV sticks, Xbox, game consoles,kindle fire, computer, camera,and more
- 5:Package accessories: 10.1inchportable TV, AC adapter, manual, remote control, antenna, car 12v cable
Do not assume that a stronger effect is automatically more faithful. A dense mask or heavy bloom can change brightness and clarity, while curvature alters the framing. The appropriate balance depends on the game’s source resolution, your scaling and your display.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Can a Raspberry Pi run CRT shaders?
Yes. Libretro documents lightweight CRT shaders for Raspberry Pi hardware, including crt-blurpi, described as designed to run full speed on Raspberry Pi hardware, and crt-pi. Start with one of these or zfast-crt, then check that the game remains smooth before trying more elaborate effects.
Rank #4
- RCA to HDMI Converter: Converts analog RCA composite (Yellow, White, Red) input to HDMI 720P/1080P output on HDTVs/Monitors. Only support RCA to HDMI. NOT Support HDMI to RCA!
- Plug to Play: AV to HDMI converter doesn't need extra drivers, just plug and play, easy to use. Please hook up the USB power cable (included) to 5V power adapter when using this RCA to HDMI adapter.
- Wide Compatibility: This av hdmi converter supports for all standard TV formats such as PAL, NTSC3.58, NTSC4.43, SECAM, PAL/M, PAL/N. Provide advanced signal processing and make videos come to life.
- Extensive Use: Composite to HDMI converter widely applied to PS2, PS3, Xbox, N64, WII, STB, VHS, VCR, DVD Players and other devices with standard composite AV input.
- Attention & Package: Please ensure to connect this rca to hdmi converter to power source to make it work. Package include: 1x RCA to HDMI Converter, 1* Micro USB cable (adapter not included), 1*User Manual. Please free feel to contact us if you have any product problems.
Older RPi1 and Zero models may need overclocking for some shader setups, but it is a possibility rather than a universal requirement or performance guarantee. A demanding preset such as CRT-Royale will generally place more load on the graphics hardware, so it is a less sensible first choice for a low-power build. Consult Libretro’s CRT shader guidance for its device and screen recommendations.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
Free tools Windows power users keep installed
One-click scans. No signup required.
