Screen Utility Tool
Professional screen testing, dead pixel detection, monitor calibration, and creative display modes all in one powerful tool
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Free Screen Utility Tool: Professional Monitor Testing & Dead Pixel Detection Online
Test your screen with 15+ professional modes including white screen, black screen, dead pixel tester, monitor calibration tools, hacker typer, Matrix rain screensaver, and more. Detect stuck pixels, calibrate displays, verify warranty claims, and enjoy creative screen effects—all 100% free in your browser.
What Is Screen Testing (And Why It Matters)?
Screen testing is the process of evaluating display quality, detecting pixel defects, calibrating color accuracy, and verifying monitor performance. According to Wikipedia's Dead Pixel article, manufacturers allow varying numbers of defective pixels before honoring warranty claims—Dell allows 0 bright pixels, while other brands permit 3-7 defects depending on screen size.
Professional screen testing goes beyond casual inspection. It uses controlled solid colors (pure white, black, red, green, blue) to reveal dead pixels, stuck sub-pixels, backlight bleed, color banding, and uniformity issues invisible during normal use. Testing before warranty expiration can save hundreds of dollars in replacement costs and ensures you receive a defect-free display.
Why Screen Testing Is Critical for Your Monitor:
Quality Assurance
- • Detect dead pixels: Find black pixels that won't illuminate
- • Identify stuck pixels: Locate pixels permanently lit in one color
- • Check uniformity: Verify consistent brightness across screen
- • Test color accuracy: Ensure proper RGB sub-pixel function
Warranty & Purchase Protection
- • Document defects: Screenshot evidence for RMA claims
- • Verify used monitors: Test before buying secondhand displays
- • ISO 13406-2 compliance: Know manufacturer pixel policies
- • Save money: Catch issues during return windows
Common Screen Defects Explained
Pixel remains black on all colors. Complete transistor failure. Most visible on white backgrounds. Usually permanent, qualifies for warranty replacement.
Pixel stays on one color (red, green, blue). Sub-pixel stuck on. Most visible on black/contrasting backgrounds. Sometimes fixable with pixel unsticking software.
Pixel always displays full brightness (white). All sub-pixels stuck on. Extremely visible on dark backgrounds. Difficult to fix, usually requires screen replacement.
One color component (R, G, or B) stuck while others work. Appears as colored dot. Sometimes fixable with rapid color cycling or pixel massage techniques.
How to Test Your Screen in 3 Simple Steps
💡 Pro Tip: Complete Dead Pixel Testing Protocol
Follow this professional sequence: 1) Start with white screen (detects dead pixels), 2) Switch to black screen (finds stuck/hot pixels), 3) Cycle through RGB colors (tests individual sub-pixels), 4) Use checkerboard pattern (reveals pixel clusters), 5) Try scanning lines (pinpoints exact pixel location). Document defects with screenshots for warranty claims. Repeat test in dark room for better stuck pixel visibility.
15+ Screen Testing Modes Available
Pure #FFFFFF display for maximum brightness testing. Dead pixels appear as black dots against white background—easiest defect type to spot. Also used for screen cleaning verification (shows fingerprints, dust, smudges clearly) and brightness uniformity checks. Keyboard shortcut: W
Pure #000000 display for contrast testing and OLED burn-in prevention. Stuck/hot pixels appear as bright dots against black background. Critical for detecting backlight bleed on LCD panels (visible as glow at edges/corners). Test in completely dark room for maximum effectiveness. Shortcut: B
Individual red, green, and blue screens test each color sub-pixel independently. Dead red pixel shows as cyan dot on red screen, dead green shows as magenta on green, dead blue shows as yellow on blue. Yellow, cyan, magenta screens test two sub-pixels simultaneously. Essential for diagnosing which color channel failed. Shortcuts: R G U Y
Comprehensive pixel testing with 8 patterns: solid colors (auto-cycles through red/green/blue/white/black every 5 seconds), checkerboard (1px alternating squares), color grid (10px blocks), horizontal scanning lines, vertical scanning lines, diagonal stripes, and gradient test. Detects stuck pixels, sub-pixel defects, and pixel clusters. Use arrow keys to navigate patterns manually. Most thorough testing option available.
Smooth black-to-white gradient reveals color banding (visible steps instead of smooth transitions). Tests 8-bit vs 10-bit panel capability and display processing quality. Detects compression artifacts and poor color depth. Critical for photo/video editing monitors requiring accurate color reproduction. Also available: RGB gradients and radial patterns.
Black screen with edge/corner detection zones highlights backlight bleeding common in LCD panels. Excessive bleed appears as bright patches at screen edges when viewed in dark room. Normal on cheaper panels but warranty-eligible if severe. IPS panels typically show more bleed than VA panels. Compare to manufacturer specifications and online reviews of your model.
Press any key to auto-type realistic code snippets from Python, JavaScript, Go, C++, and Shell. Includes 6 terminal themes (classic Matrix green-on-black, blue, amber, dark, hacker). Perfect for presentations, film production, streaming overlays, or pretending to hack the mainframe. Every keypress types 3-7 characters for dramatic effect. Keyboard shortcut: H
Iconic Matrix movie effect with falling green Japanese Katakana characters. Supports multiple character sets (Katakana, Latin, numbers, mixed) and adjustable speed/density. Red "glitch" characters appear randomly. Uses HTML5 Canvas for smooth 60fps animation. Pause/resume with SPACE key. Shortcut: M
3D perspective star animation with adjustable speed from slow drift to hyperspace warp. Choose from white stars, blue nebula, rainbow spectrum, or random colors. 200-2000 stars depending on device performance. Click to change direction. Perfect for relaxation, meditation, or sci-fi themed displays. Battery-saving mode available for mobile devices. Shortcut: S
Animated circular radar with sweeping beam, distance rings, crosshairs, and random ping detection effects. Customizable sweep speed, ping count, and grid lines. Available in classic green, blue modern, or red alert color schemes. Includes optional sonar ping sound effects and coordinate display. Perfect for presentations, gaming overlays, or sci-fi aesthetics.
Realistic operating system loading screens with progress bars. Themes include Windows (blue background, white text), macOS (light gray, SF Pro font), Linux (dark terminal), and Modern (black with green accents). Speed options: instant (1s), fast (10s), medium (30s), slow (2min). Features 20+ humorous messages like "Downloading more RAM..." and "Hacking the mainframe...". Optional error simulation for pranks.
Realistic broken glass overlay with 8 crack patterns: impact crack, shattered, corner damage, hairline fracture, web pattern, diagonal split, edge fracture, and multiple impact. Touch/click to spread cracks. Mobile shake detection adds more fractures. Optional 10-second delayed activation. Clear "Reveal" button shows it's fake. Completely harmless—no actual damage to screen. Includes safety disclaimer.
Cyberpunk digital glitch effects: RGB color separation (chromatic aberration), CRT scanlines, random block displacement, VHS tracking errors, and static noise overlay. Intensity levels: subtle (slight aberration), medium (noticeable glitches), extreme (heavy distortion). Emulates analog TV and retro computer aesthetics. Perfect for digital art, music videos, or cyberpunk-themed content creation.
Mobile and tablet screen testing with multi-touch support (up to 10 simultaneous touches). Draw mode tests all screen areas for dead zones. Grid overlay shows untested regions. Trail visualization reveals touch accuracy and sensitivity. Adjustable touch size and grid density (2×2 to 20×20). Essential for smartphones, tablets, and touchscreen monitors before purchase.
Uses requestAnimationFrame API to calculate actual monitor refresh rate. Distinguishes 60Hz, 75Hz, 120Hz, 144Hz, 165Hz, 240Hz, and 360Hz displays. Verifies gaming monitor specifications and confirms high refresh rate is actually enabled in display settings. Helps troubleshoot "feels like 60Hz but should be 144Hz" issues common with HDMI vs DisplayPort connections.
8 Real-World Screen Testing Scenarios
1. Warranty Claim Documentation
Scenario: You notice a bright spot on your 3-month-old monitor. Manufacturer requires proof of dead pixels for RMA.
Solution: Use white screen test to locate dead pixel. Take screenshot showing defect location. Switch to black screen to confirm pixel is completely dead (not stuck). Document with red/green/blue screens to show all sub-pixels failed. Include photos of full screen and close-up with ruler for scale. Submit to manufacturer with purchase receipt—claim approved within 48 hours.
2. Used Monitor Purchase Verification
Scenario: Buying a used 4K monitor from Craigslist for $300. Seller claims "perfect condition, no issues."
Solution: Bring laptop to seller's location. Load screen utility tool from phone or remember URL. Test with white screen (found 2 dead pixels seller "didn't notice"), black screen (revealed backlight bleed at bottom), gradient test (showed color banding). Negotiated price down to $180 or walked away. Saved $120 or avoided bad purchase entirely.
3. Professional Photo Editing Calibration
Scenario: Photographer notices color inconsistencies between monitor display and print output.
Solution: Use gradient test to check 10-bit color depth capability. RGB screens verify individual color channel accuracy. Backlight bleed test ensures uniform brightness for accurate exposure judgment. Combine with hardware calibrator like X-Rite ColorMunki for complete calibration. Gradient test revealed 8-bit panel marketed as 10-bit—explained print color mismatches.
4. Gaming Monitor High Refresh Rate Verification
Scenario: New 144Hz gaming monitor purchased but games still feel like 60Hz. Unsure if high refresh actually working.
Solution: Refresh rate indicator showed monitor running at 60Hz despite 144Hz spec. Issue: HDMI cable limited to 60Hz at 1440p resolution. Switched to DisplayPort cable, refresh test now shows 144Hz. Alternatively use starfield or Matrix rain animations to visually confirm smooth motion at higher frame rates. Problem solved.
5. Smartphone Dead Zone Detection
Scenario: iPhone touchscreen sometimes doesn't respond to taps in specific areas. Needs warranty service proof.
Solution: Touch screen test mode with grid overlay. Drew across entire screen surface—grid showed 4×4 zone at top-right never registered touches. Screen recorded video evidence. Apple Genius Bar verified dead zone, replaced screen under warranty at no cost. Dead zones are hardware defects covered by warranty but hard to prove without testing tool.
6. OLED Burn-In Prevention Routine
Scenario: OLED laptop owner worried about taskbar/dock burn-in after 2 years of same desktop layout.
Solution: Run black screen test weekly for 10 minutes (OLED pixel refresh). Use full-spectrum color rotation (white/red/green/blue) monthly to exercise all sub-pixels evenly. Prevented permanent image retention. Modern OLEDs have built-in pixel shift but manual cycling extends lifespan. Combined with screensaver when idle—no burn-in after 3 years of heavy use.
7. Content Creator Stream Overlay Testing
Scenario: Twitch streamer wants futuristic hacker aesthetic for coding streams but lacks technical background.
Solution: Use hacker typer mode as background during "coding segments" for dramatic effect. Matrix rain during breaks. Radar scanner for game loading screens. Record hacker typer fullscreen, import as video overlay in OBS Studio. Chat engagement increased 40% with professional terminal visuals. No actual coding knowledge required—realistic simulation does the work.
8. Monitor Quality Control (Manufacturing/Retail)
Scenario: Electronics retailer needs quick, free QA tool for testing returned/refurbished monitors before resale.
Solution: Train staff on 2-minute test protocol: white screen (30s), black screen (30s), dead pixel tester auto-cycle (60s). Bookmark URL on testing station. Pass/fail criteria: 0 bright pixels, maximum 3 dark pixels (ISO Class II). Document results with screenshots. 100% free alternative to enterprise testing software costing hundreds. Reduced customer complaints 85% by catching defects before resale.
7 Screen Testing Mistakes That Cost You Money
Not Cleaning Screen Before Testing
Mistake: Mistaking dust, fingerprints, or smudges for dead pixels. Wasting hours troubleshooting non-issues.
Fix: Use microfiber cloth with screen-safe cleaner. Wipe in circular motions. Wait for complete drying. Retest on white screen—most "defects" disappear. Real dead pixels are perfectly round dots, not irregular smudges.
Testing at Low Brightness
Mistake: Running tests at 30-50% brightness. Missing stuck pixels that only appear at maximum brightness.
Fix: Set brightness to 100% during all tests. Dead/stuck pixels most visible at full brightness. Reduce after testing completes. Many warranty claims denied because defect "not reproducible"—manufacturer tests at max brightness.
Only Testing with One Color
Mistake: Checking white screen only. Missing stuck sub-pixels invisible against white.
Fix: Always test minimum: white (dead pixels), black (stuck pixels), red/green/blue (sub-pixel defects). Complete test takes 2 minutes. Stuck red sub-pixel appears cyan on red screen but invisible on white. Test all colors or miss 60% of defects.
Not Documenting Defects Properly
Mistake: Finding dead pixels but no photo evidence. Warranty claim requires proof you "can't provide later."
Fix: Screenshot immediately (Windows: Win+Shift+S, Mac: Cmd+Shift+4). Take phone photo showing full screen. Close-up with ruler for scale. Note exact pixel coordinates. Date-stamped evidence. Manufacturers require documentation within 30-day return window—no photos = no replacement.
Assuming 1 Dead Pixel = Warranty Replacement
Mistake: Expecting replacement for single defect. Most brands require 3-7 pixels depending on screen size.
Fix: Check manufacturer's dead pixel policy before purchase. Dell: 0 bright pixels tolerated. LG/Samsung: 3-5 pixels. Budget brands: 5-10 pixels. Read ISO 13406-2 standard. Know your rights. Some stores offer zero-defect guarantees—worth paying extra.
Testing From Wrong Viewing Angle
Mistake: Checking screen from side angle. IPS glow and TN color shift mask real defects or create false positives.
Fix: Sit directly in front at normal viewing distance (arm's length). Eyes level with center of screen. TN panels show massive color shift at angles—this is normal, not defect. IPS glow at corners when viewing from side is also normal. Test from proper position to avoid false alarms.
Waiting Too Long to Test New Monitor
Mistake: Unboxing monitor, using for 3 months, then discovering dead pixels after return period expired.
Fix: Test immediately upon unboxing—before removing protective film. Dead pixels often present from factory. Amazon: 30-day return. Best Buy: 15 days. Manufacturer warranty: 1-3 years but stricter requirements. Find defects during generous return window when "I don't like it" is valid reason. After 30 days, you need proof and minimum defect count.
Frequently Asked Questions
How do I test for dead pixels on my monitor?
Use a solid color screen test: 1) Start with pure white screen (#FFFFFF)—dead pixels appear as black dots. 2) Switch to pure black screen (#000000)—stuck/hot pixels appear as bright dots. 3) Cycle through red, green, and blue screens to test individual sub-pixels. 4) Clean your screen first with microfiber cloth to avoid mistaking dirt for defects. 5) Set brightness to 100% for accurate detection. 6) View from directly in front at normal distance. Complete test takes 2-3 minutes. Our dead pixel tester auto-cycles through all necessary colors and includes checkerboard pattern for cluster detection.
What's the difference between dead pixels and stuck pixels?
Dead pixel: Remains black on all colors due to complete transistor failure. Most visible on white backgrounds. Typically permanent damage requiring screen replacement. Stuck pixel: Stays lit in one color (red, green, or blue) because one sub-pixel is stuck "on" while others work normally. Most visible on black or contrasting color backgrounds. Sometimes fixable with pixel unsticking software that rapidly flashes colors, or gentle pressure massage. Hot pixel: Always displays full white brightness (all sub-pixels stuck on). Extremely visible on dark content. Difficult to fix, usually permanent. Test with both white and black screens to distinguish between these defect types.
How many dead pixels are acceptable for warranty replacement?
Depends on manufacturer policy and ISO 13406-2 classification. Dell: 0 bright pixels, 5 dark pixels (premium bright pixel guarantee). LG/Samsung: 3-7 pixels depending on screen size and location. Apple: Case-by-case, typically requires 3+ pixels in close proximity. Budget brands: 5-10 pixels. ISO Class I: Zero defects. Class II: 2 bright, 2 dark, 5 sub-pixel per million pixels (most common). Class III: 5 bright, 15 dark, 50 sub-pixel. Check your monitor's manual or manufacturer website for specific policy. Bright/stuck pixels weighted more heavily than dark ones. Center screen defects more serious than edge defects. Document defects with screenshots and photos for warranty claims.
Can I fix dead or stuck pixels myself?
Dead pixels: Usually permanent, rarely fixable. Hardware failure requires screen replacement. Stuck pixels: Sometimes fixable with these methods: 1) Pixel unsticking software: Programs like JScreenFix or UDPixel rapidly flash colors at stuck pixel location for 10+ minutes (20-30% success rate). 2) Pressure method: Gently press stuck pixel location with soft cloth while turning monitor on/off (risky, may worsen). 3) Heat method: Apply warm (not hot) damp cloth to area for few minutes (low success rate). 4) Time: Some stuck pixels fix themselves after weeks/months of varied use. Our screen utility includes rapid color cycling mode useful for unsticking attempts. Success rates vary—don't delay warranty claim hoping for self-fix. Document defect immediately even if attempting repair. Most stuck pixels reappear after temporary fix.
What is backlight bleeding and is it normal?
Backlight bleeding appears as bright glow at screen edges/corners when displaying pure black (#000000) in dark room. Caused by LCD panel design where backlight behind liquid crystal layer leaks around edges. Normal levels: Slight glow at corners on IPS panels (common, acceptable). VA panels typically show less bleed. TN panels minimal bleed but worse viewing angles. Excessive bleed: Bright patches covering 20%+ of screen area, visible during normal use (not just black screens in dark room). This warrants warranty claim for "poor manufacturing quality." Test with our backlight bleed mode in completely dark room. Compare to reviews of your specific monitor model—some designs naturally show more bleed. Gaming monitors with thin bezels typically worse than professional displays. Not fixable—requires panel replacement if severe. Most manufacturers won't replace for "normal" levels—check customer photos of your model to set expectations.
Why should I test a monitor before buying (especially used)?
New monitors: Factory defects occur in 2-5% of units according to industry data. Dead pixels, backlight bleed, excessive IPS glow, or color banding invisible during brief in-store viewing under bright lights. Test immediately upon unboxing during generous return period (Amazon: 30 days, retail: 15 days) when "I don't like it" suffices. After window closes, you need proof of significant defects meeting warranty thresholds. Used monitors: Sellers often unaware of or hide defects. $500 monitor with 5 dead pixels worth $200 at most. Backlight bleed worsens over time. OLED burn-in from previous owner's use. Bring laptop to seller location, load screen test URL (bookmark this page), test thoroughly before paying. Walk away from defective units. Used monitor market filled with warranty-rejected returns sold as "excellent condition." 10 minutes of testing saves hundreds in bad purchases or repair costs. Document everything if buying online—PayPal/eBay protection requires proof seller misrepresented condition.
Is this screen testing tool safe for my monitor?
Yes, 100% safe. Our tool only displays colors and animations—no software installation, no system access, no hardware interaction beyond normal display output. Solid colors (white, black, RGB) are standard testing method used by manufacturers themselves. Cannot cause burn-in, pixel damage, or hardware issues. All processing happens client-side in your browser using standard HTML5 Canvas and CSS. No data sent to servers. No cookies except LocalStorage for preferences. Works offline after initial page load. Safety features: Photosensitivity warning for flashing modes, ESC key always exits, no trap mechanisms. OLED-specific: Prolonged static images can cause burn-in on OLED displays—avoid leaving solid white screen for hours. Test briefly (30-60 seconds per color), use auto-cycling modes, or switch colors frequently. LCD/LED monitors immune to burn-in. Our tool same technology used by professional calibration software costing hundreds of dollars. Trusted by retail stores for QA testing.
What's the best monitor testing routine for new displays?
Immediate unboxing test (5 minutes): 1) Clean screen with microfiber cloth. 2) Set brightness to 100%. 3) White screen test for 60 seconds—check for dead pixels. 4) Black screen test for 60 seconds in dark room—check stuck pixels and backlight bleed. 5) Cycle through red, green, blue screens (30 seconds each)—test individual sub-pixels. 6) Gradient test—check color banding. 7) Take screenshots and photos of any defects. 8) Repeat test in 24 hours (some defects appear after panel warms up). Weekly maintenance (OLED only): Run black screen for 10 minutes weekly to refresh pixels. Monthly full-color rotation. Before warranty expires: Complete test again at 11 months for 1-year warranty, 2.5 years for 3-year warranty. Catch degradation issues (backlight dimming, color shift) before coverage ends. Document everything with date-stamped evidence. Most defects appear within first month or near warranty expiration—test both periods thoroughly.
Advanced Monitor Testing & Calibration Strategies
Professional Pixel Density & Viewing Distance Calculations
Understanding PPI (pixels per inch) helps determine if dead pixels will be visible during normal use. Calculate: diagonal pixels / diagonal inches. Example: 27" 4K monitor = √(3840² + 2160²) / 27 = 163 PPI. At 24" viewing distance, pixels below 1 arc minute (0.3mm at that distance) are invisible to human eye. Dead pixel visibility: Low PPI (90-110) like 24" 1080p = very visible, warranty critical. Medium PPI (110-160) like 27" 1440p = visible up close, less noticeable at distance. High PPI (160-220) like 27" 4K = barely visible at normal distance. Retina (220+ PPI) like MacBook displays = invisible without magnification. Use our built-in PPI calculator by entering your resolution and screen size. Higher PPI monitors may technically have dead pixels you'll never see—consider whether warranty claim worth the hassle.
Color Gamut & Bit Depth Verification
Gradient test reveals actual color depth vs marketing claims. 6-bit + FRC (budget panels): Noticeable banding in grayscale gradients, dithering patterns visible. 8-bit native (standard): Smooth gradients with 16.7 million colors. 10-bit (professional): Ultra-smooth gradients with 1.07 billion colors, no visible banding. Test with grayscale gradient and RGB rainbow gradients. Compare to specs: if monitor claims 10-bit but shows banding, likely 8-bit panel with FRC dithering. Professional photo/video work requires true 10-bit. Gaming monitors typically 8-bit which is sufficient. Use gradient test alongside hardware colorimeter (X-Rite i1Display Pro, Datacolor SpyderX) for complete calibration. Our tool free alternative for basic gamut verification—pair with color converter tool for hex code testing.
Response Time & Ghosting Analysis
Fast-moving animations like starfield and Matrix rain reveal pixel response time issues. TN panels: 1-2ms response, minimal ghosting. IPS panels: 4-5ms typical, some trailing on fast motion. VA panels: 5-8ms, most ghosting especially dark to light transitions. Manufacturers advertise "1ms" using overdrive which causes inverse ghosting (dark trails). Test with Matrix rain at various speeds—watch character trails. Adjust monitor's overdrive setting ("Response Time," "AMA," "TraceFree" in OSD menu). Too high = overshoot artifacts. Too low = ghosting. Find sweet spot where trails minimal without inverse ghosting. Compare to TestUFO (dedicated motion test site) for comprehensive analysis. Our starfield warp speed mode good for quick ghosting check—stars should have minimal trails. Gaming monitors benefit most from response time testing.
HDR & Local Dimming Zone Testing
Black screen test reveals local dimming behavior on FALD (Full Array Local Dimming) monitors. Edge-lit LED: Entire screen dims uniformly, significant backlight bleed. FALD (32-512 zones): Zones dim independently, visible "blooming" around bright objects on black background. Mini-LED (500+ zones): Minimal blooming, near-OLED blacks. OLED: Perfect blacks, per-pixel control, zero bloom. Test by displaying small white square on black screen (use cracked screen overlay or custom pattern)—watch for halo effect around white area. Good FALD minimizes bloom, cheap implementations create large halos. Also test for zone flickering (zones turning on/off creates shimmer). HDR certification: DisplayHDR 400 (edge-lit, minimal improvement), DisplayHDR 600 (basic FALD), DisplayHDR 1000 (good FALD/Mini-LED), DisplayHDR 1400 (premium Mini-LED). Our black screen mode helps verify actual performance vs marketing specs.
Multi-Monitor Uniformity Matching
Multi-monitor setups require color/brightness matching. Test each screen individually with white/gray screens then compare side-by-side. Common issues: Different white points (one screen warmer/cooler), brightness variance (one dimmer), tint differences (green/magenta cast). Solution: Calibrate each monitor separately. Use monitor OSD to adjust RGB gains (color temperature), brightness, contrast. Match to weakest monitor (can't increase max brightness beyond panel capability, only decrease). Professional solution: Hardware calibrator creates ICC profile per monitor. Budget solution: Visual matching with our white screen test. Display same solid color across all monitors, adjust until they match. Use gray screen (not white) for matching—human eye more sensitive to gray differences. Some panel-to-panel variation inevitable even with same model. Consider purchasing monitors from same production batch (same serial number prefix) for better matching. Test with gradient across all monitors—should appear seamless. Mismatched monitors problematic for photo editing, design work, and immersive gaming.
Viewing Angle & Panel Type Identification
Panel type affects viewing angle performance. Test with solid colors while moving head side-to-side and up-down. TN panels: Massive color shift at angles, vertical shift worse than horizontal, colors invert when viewed from below. Cheap, fast, poor angles. IPS panels: Excellent viewing angles, slight IPS glow at corners when viewed from side, minimal color shift. Premium price, moderate speed. VA panels: Good viewing angles (better than TN, worse than IPS), noticeable darkening at extreme angles, best contrast ratio. Middle ground option. Test with white screen from various angles. TN shows yellowing/darkening dramatically. IPS shows purple/white glow at corners. VA shows uniform darkening. Verify manufacturer claims—some "IPS-type" panels actually VA. Viewing angle matters for: shared screen viewing, vertical monitor orientation, multi-monitor peripheral screens. Gaming monitors often TN for speed despite poor angles. Professional displays always IPS for color accuracy and wide angles. Use color screens at angles to see shift intensity.
Related Testing & Utility Tools
🎨 Color Converter
Convert HEX, RGB, HSL color codes for custom screen test colors and calibration reference values.
📏 Unit Converter
Calculate PPI, convert inches to centimeters for screen size verification and viewing distance optimization.
🔢 Scientific Calculator
Calculate pixel density, aspect ratios, and screen diagonal measurements for monitor specifications.
🖼️ Image Resizer
Resize screenshots of screen defects for warranty claim documentation and pixel-perfect comparison.
⏰ Timestamp Converter
Track warranty expiration dates and document when screen defects first appeared for RMA claims.
🔐 Checksum Calculator
Verify monitor firmware downloads and driver integrity before installation to prevent display issues.
Ready to Test Your Screen?
Start testing with 15+ professional screen modes. Detect dead pixels, calibrate colors, verify monitor quality, or enjoy creative screensavers—all completely free in your browser. No signup, no installation, instant access.