Free FPS Tester Tool
Monitor & Performance Checker
Check your browser's real FPS, find your monitor's true Hz, measure your reaction speed, test click rate, check every keyboard key, find dead pixels, and estimate PC bottlenecks — all free, in your browser. No download. No signup.
FPS Test — What It Measures and Why It Matters
FPS stands for Frames Per Second. It tells you how many images your system draws on screen every second. A higher FPS means smoother movement. A lower FPS means choppy, lagging visuals. This tool measures your browser's FPS using the requestAnimationFrame API — the same method browsers use internally to animate web pages and run WebGL.
This is a browser FPS test, not a GPU game benchmark. It tells you how fast your browser can render frames on this specific device. If you want to test in-game FPS, you need software like MSI Afterburner or your game's built-in counter. But for browser performance, web apps, and monitor verification — this tool gives you accurate, real numbers.
How to Read Your FPS Results
The tool shows six key values. Here is what each one tells you:
- Current FPS — the live frame rate right now, updated every 250ms by default
- Min FPS — the lowest frame rate recorded during the test session
- Max FPS — the highest frame rate seen — usually close to your monitor's Hz
- Avg FPS — the average across all readings — the most reliable overall number
- 1% Low — the bottom 1% of frame rate readings. Low 1% lows cause visible stutter even when average FPS looks fine
- Frame Time — how many milliseconds each frame takes. At 60 FPS, frame time is 16.67ms. At 144 FPS, it is 6.94ms
FPS Benchmarks — What Is a Good Score?
| FPS Range | What You See | Best For | Rating |
|---|---|---|---|
| Below 30 | Clearly choppy, hard to watch | Nothing — needs fixing | POOR |
| 30 – 59 | Watchable but not smooth | Video streaming, casual use | BELOW AVG |
| 60 | Smooth for most people | Web browsing, casual gaming | GOOD |
| 120 – 144 | Noticeably smoother than 60 | Competitive gaming, fast action | GREAT |
| 165 – 240 | Very smooth, quick response | Esports, fast-paced shooters | EXCELLENT |
| 360+ | Only visible on 360Hz+ monitors | Professional esports players | ELITE |
Why Your FPS Might Be Lower Than Expected
If your FPS test shows 60 but your monitor is 144Hz, there are a few common reasons. First, check that hardware acceleration is turned on in your browser — in Chrome, go to Settings → System → "Use hardware acceleration when available." Second, make sure no other heavy tabs or programs are running. Third, some browsers limit requestAnimationFrame to 60Hz by default unless the page actively uses GPU features.
Also note: this test is capped by your monitor's refresh rate. If you have a 60Hz monitor, you cannot get more than 60 FPS here — that is physically how your display works, not a limitation of the tool.
Frame Time vs FPS — Which Matters More?
Most people look at average FPS, but frame time consistency matters just as much. If your average is 100 FPS but every few seconds you get a spike to 50ms (20 FPS equivalent), you will feel stutters even though the number looks good. Always check your 1% Low and frame time alongside your average for a full picture of smoothness.
Refresh Rate Test — How to Check Your Monitor's True Hz
Your monitor's refresh rate is how many times per second it redraws the image on screen. It is measured in Hertz (Hz). A 60Hz monitor redraws 60 times per second. A 144Hz monitor redraws 144 times. More redraws = smoother motion, especially in fast games.
This test measures your monitor's actual refresh rate by timing the gaps between animation frames using performance.now(), which is accurate to fractions of a millisecond. It does not rely on what your operating system reports — it measures what your display is actually doing right now.
Why Your Detected Hz Might Not Match Your Monitor's Spec
Sometimes the test shows 60Hz even though you bought a 144Hz monitor. This usually means your monitor is connected via HDMI 1.4, which caps out at 60Hz for 1080p in many cases. DisplayPort cables support higher refresh rates. Also, make sure your display settings in Windows (Display Settings → Advanced Display → Refresh Rate) are set to the correct Hz — Windows often defaults to 60Hz even on high-refresh monitors.
Refresh Rate Comparison Table
| Refresh Rate | Frame Time | Smoothness Feel | Who Is It For? |
|---|---|---|---|
| 60 Hz | 16.67 ms | Standard smooth | Office work, casual browsing, movies |
| 75 Hz | 13.33 ms | Slightly better than 60 | Budget gaming monitor upgrade |
| 100 Hz | 10.00 ms | Noticeably smoother | General gaming, fast web use |
| 144 Hz | 6.94 ms | Very smooth — most popular | PC gamers, competitive games |
| 165 Hz | 6.06 ms | Smooth+ | Mid to high-end gaming setups |
| 240 Hz | 4.17 ms | Extremely smooth | Competitive FPS, esports |
| 360 Hz | 2.78 ms | Near-instant visual feedback | Professional tournament players |
What Is Frame Time Variance?
The test also shows variance and stability. Variance tells you how consistent your monitor's frame delivery is. A very stable monitor will show variance under 0.1ms. Higher variance (0.5ms or more) can cause micro-stutters even at a high average refresh rate. This is worth checking if your screen looks rough despite a high Hz reading.
Does More Hz Always Mean Better?
Not always. Your GPU needs to be powerful enough to produce the extra frames too. A 240Hz monitor running 80 FPS looks the same as a 144Hz monitor running 80 FPS. The monitor Hz only helps when your frame rate matches or exceeds it. That is why FPS and Hz go together — test both using this tool.
Reaction Time Test — Measure Your Real Response Speed
Your reaction time is how long it takes you to respond to something you see. It is measured in milliseconds (ms). In gaming, a faster reaction time gives you a real advantage — especially in first-person shooters where split-second decisions win fights.
This test shows a green signal after a random delay. You click as fast as you can. The time between the signal appearing and your click is your reaction time. The random delay prevents you from guessing and clicking early, which would give a fake fast result.
What Affects Your Reaction Time Score?
Your raw biological speed is the foundation, but several other things change your final score here:
- Monitor input lag — budget monitors can add 10–40ms of delay between signal and screen update
- Mouse polling rate — a 125Hz mouse adds up to 8ms of click delay; a 1000Hz mouse adds under 1ms
- Fatigue and focus — tired people react 30–50ms slower than when rested and focused
- Caffeine — mild stimulants can improve reaction time by 10–20ms in some people
- Practice — doing this test daily trains your anticipation and reflexes over time
Average Reaction Time by Skill Level
| Reaction Time | Skill Rating | Who Scores This? | Gaming Impact |
|---|---|---|---|
| Under 150ms | ELITE | Top-tier competitive players | Significant first-shot advantage |
| 150 – 190ms | PRO LEVEL | Experienced daily gamers | Strong competitive edge |
| 190 – 230ms | GOOD | Regular gamers, healthy adults | Competitive in casual lobbies |
| 230 – 270ms | AVERAGE | General population | Standard performance |
| 270 – 320ms | BELOW AVG | Non-gamers, tired users | Noticeable disadvantage |
| Over 320ms | SLOW | Very fatigued, high monitor lag | Significant disadvantage |
How to Improve Your Reaction Time
Practice this test daily for a week and you will likely see a 15–30ms improvement just from learning how to focus and click at the right moment. Beyond this tool, aim training games like Aim Lab and KovaaK's are designed specifically to build faster reflexes. Good sleep, hydration, and reducing eye strain also measurably improve reaction scores.
Important Limitation — This Measures Click Reaction, Not Aim Speed
This test measures how fast you click after seeing a signal. In real games, your reaction time also includes the time to move your mouse to a target, read the situation, and make a decision. That is why in-game performance involves more than just a fast click — but a fast baseline is still a real advantage.
CPS Test — How Many Clicks Per Second Can You Do?
CPS stands for Clicks Per Second. This test counts how many times you click your mouse button within your chosen time window (5, 10, 15, 30, or 60 seconds) and divides that by the number of seconds. The result is your CPS score.
CPS matters in Minecraft PvP, browser games, and any clicking challenge. A higher CPS can give you a real advantage in games where click speed affects damage rate or block placement. However, technique matters as much as raw speed.
Clicking Techniques Explained
| Technique | Typical CPS | How It Works | Risk |
|---|---|---|---|
| Regular Click | 4 – 8 | Normal index finger clicking | None |
| Drag Click | 25 – 50+ | Drag finger across button to register many clicks | Mouse damage |
| Jitter Click | 12 – 16 | Tense arm muscles to vibrate the hand rapidly | Wrist strain |
| Butterfly Click | 16 – 25 | Two fingers alternating on one button | Moderate wrist strain |
| Auto Click | Unlimited | Software simulates clicks automatically | Cheating — ban risk |
What Is a Good CPS Score for Regular Users?
| CPS Score | Rating | What It Means |
|---|---|---|
| 1 – 4 | LOW | Casual or elderly users, single slow clicks |
| 5 – 8 | AVERAGE | Normal desktop users, non-gamers |
| 9 – 12 | GOOD | Regular gamers using fast regular clicks |
| 13 – 16 | FAST | Practiced gamers, light jitter clicking |
| 17 – 25 | VERY FAST | Butterfly or drag clicking technique users |
| 25+ | Verify method | Drag click or auto-clicker territory |
Tips for a Better CPS Score
Use a lightweight mouse with a low-weight click mechanism. Keep your hand relaxed — tension slows you down. Your wrist should rest comfortably, not hover. Practice short 5-second bursts rather than long sessions. Most importantly: do not try jitter or butterfly clicking without taking regular breaks, as repetitive strain injuries are a real risk.
Does CPS Matter in All Games?
No. In most modern PC games, holding down the mouse button or having a high polling rate matters more than raw CPS. CPS is most relevant in Minecraft Java PvP (1.8 versions), browser clicker games, and some mobile games. In FPS titles like Valorant or CS2, aim accuracy and reaction time matter far more than clicking speed.
Keyboard Tester — Test Every Key on Your Keyboard
This tool lights up each key as you press it so you can check that every single key is working correctly. It is useful when you buy a new keyboard, troubleshoot a key that feels stuck, or want to test for ghosting — which is when your keyboard fails to register certain key combinations.
What Is Keyboard Ghosting?
Ghosting happens when you press 3 or more keys at the same time and one of them does not register. This is a hardware limitation of cheaper keyboards that use a simple key matrix design. For example, pressing W + A + Shift in a game might cause one key to be ignored.
Gaming keyboards advertise N-Key Rollover (NKRO) which means every key you press registers correctly no matter how many others are held. To test this, hold multiple keys at once and watch which ones light up on this tester. If some keys you are holding do not light up, your keyboard has ghosting on those combinations.
What Should You Use This Keyboard Tester For?
| Use Case | What to Check | Result to Look For |
|---|---|---|
| New keyboard setup | Press every key once | All keys register and light up |
| Sticky or dead key | Press that specific key | Does it light up and release cleanly? |
| Ghost key test | Hold W + A + Shift + Space | All four should light up at once |
| After spill accident | Test all rows systematically | Identify which keys are affected |
| Dual-mode keyboards | Test in both modes | Confirm all keys work in each profile |
Sticky Mode vs Highlight Mode
The tester has two modes. In Highlight mode, keys light up while held and turn off when released — ideal for testing ghosting with multiple simultaneous keys. In Sticky mode, keys stay lit after being pressed, making it easy to track which keys you have already tested during a full keyboard sweep.
Common Keyboard Problems Found With This Tool
Keys that do not light up at all have either a hardware failure (common in membrane keyboards after heavy use) or a driver conflict. Keys that light up but then immediately disappear may be chattering — a common problem in older mechanical switches. If your keyboard shows correct input here but behaves wrong in a game, the game likely has a key conflict or rebinding issue, not a hardware fault.
Fill your screen with a solid color to spot dead/stuck pixels. Click Fullscreen Mode for the most accurate test — look for any tiny dots that don't match the background color.
Dead Pixel Test — Find Faulty Pixels on Your Monitor
A dead pixel is a tiny dot on your screen that does not display the correct color. Instead, it stays permanently black, white, red, green, or blue — no matter what is showing on screen. Dead pixels are hardware defects. They cannot be fixed by software updates or driver changes.
This test fills your entire screen with one solid color at a time. Any pixel that does not match the background color stands out immediately as a defective pixel. For the best results, use the fullscreen mode in a dark or dim room.
Types of Pixel Defects — What Each One Looks Like
| Defect Type | What You See | What Causes It | Can It Be Fixed? |
|---|---|---|---|
| Dead Pixel | Always black dot, visible on white/bright screens | Transistor completely failed — no power reaches pixel | Rarely — usually permanent |
| Stuck Pixel | Always one color (red, green, or blue) | Pixel is stuck in the ON state | Sometimes — pixel-fixing apps can help |
| Hot Pixel | Always white or very bright | Sub-pixel draws maximum current constantly | Sometimes |
| Sub-pixel defect | Tiny colored fringe on one side | One of the three RGB sub-pixels has failed | Rarely |
How to Do a Proper Dead Pixel Test
Click Fullscreen Test above. Your entire screen will fill with a solid color. Slowly scan across the entire screen — pay extra attention to the corners and edges where pixel defects are most common. Click to cycle through black, white, red, green, and blue. Each color reveals different types of defects. A dead pixel (always black) is only visible on white, red, green, or blue backgrounds — it disappears on a black screen.
Dead Pixel Policies — Know Your Rights
Most monitor manufacturers have a "dead pixel policy." They will only replace a monitor if it has more than a certain number of dead pixels. For example, some brands replace only if there are 5+ dead pixels. Premium brands like ASUS ROG offer a "zero bright dot" guarantee on selected models. Always check the dead pixel policy before buying a monitor, and run this test within the return window of any new display.
Can You Fix a Stuck Pixel?
Stuck pixels (not dead ones) can sometimes be fixed by rapidly flashing colors at the stuck pixel location to "unstick" the transistor. Some free tools do this by cycling RGB values very quickly for several minutes. This works in some cases but not all. It does not work on truly dead pixels where the transistor has completely failed.
🧠 CPU
🎮 GPU
💾 RAM
🎯 Use Case
PC Bottleneck Calculator — Find What Is Slowing Down Your System
A bottleneck happens when one component in your PC cannot keep up with the rest. The most common example: a slow CPU paired with a powerful GPU. The GPU finishes rendering a frame quickly and then just waits for the CPU to send it more work. The GPU sits idle instead of running at full speed — and your FPS suffers.
This calculator estimates the balance between your CPU, GPU, and RAM based on their performance tiers. It gives you a directional result — meaning it tells you which component is the likely weak link — so you know what to upgrade first.
How to Read Your Bottleneck Results
| Result | What It Means | What to Do |
|---|---|---|
| Well Balanced (difference <10%) | CPU and GPU are well matched | Upgrade both together for best gains |
| CPU Bottleneck | CPU is slower than the GPU can use | Upgrade CPU, enable XMP for RAM, raise in-game resolution |
| GPU Bottleneck | GPU cannot keep up with CPU output | Upgrade GPU, lower resolution/graphics settings |
Common Bottleneck Situations in Real Gaming
| Setup Example | Likely Bottleneck | Why |
|---|---|---|
| RTX 4090 + Intel Core i5-8400 | Heavy CPU bottleneck | 6-year-old mid-range CPU cannot feed a top GPU fast enough |
| RTX 3060 + Core i9-13900K | GPU bottleneck at 1080p | Powerful CPU waiting for mid-tier GPU, especially at 144+ FPS |
| RTX 4070 + Ryzen 7 5800X | Balanced (slight GPU at 4K) | Good pairing for 1440p; GPU limited at 4K which is normal |
| GTX 1660 Super + Ryzen 5 3600 | Balanced | Both from the same era, roughly matched performance tiers |
| Any GPU + 8GB single-channel RAM | RAM bottleneck | Single channel halves memory bandwidth, hurting both CPU and GPU |
Important Note About This Calculator
This tool gives you an estimate based on component tiers — it does not have access to your actual hardware performance data. Real-world bottlenecks vary by game engine, resolution, settings, and workload. Certain games like Microsoft Flight Simulator are heavily CPU-limited even on powerful rigs. Others like Cyberpunk 2077 at 4K Ultra are almost always GPU-limited. Use this calculator as a starting guide, then check benchmarks specific to the games you play.
RAM and Bottlenecks — Often Overlooked
RAM can cause a bottleneck too, especially if you are using a single RAM stick (single-channel). Dual-channel RAM roughly doubles your memory bandwidth, which directly improves both CPU and GPU performance in memory-sensitive games. If your RAM is running in single-channel mode, switching to two sticks of the same speed can give you a noticeable FPS boost at no extra cost beyond the RAM itself.
How This Tool Works — Technical Transparency
Every test on this page runs entirely inside your browser. No data leaves your device. Here is exactly what powers each tool:
| Tool | Browser API Used | Accuracy Level |
|---|---|---|
| FPS Tester | requestAnimationFrame + performance.now() | Up to monitor Hz |
| Refresh Rate Test | performance.now() (sub-millisecond) | ±0.5 Hz typical |
| Reaction Time Test | performance.now() + random delay via setTimeout | ±1–5ms (input lag dependent) |
| CPS Test | mousedown event listener + setInterval | Exact click count |
| Keyboard Tester | keydown / keyup events + event.code | 100% accurate per key event |
| Dead Pixel Test | HTML5 Canvas + CSS Fullscreen API | Visual check only |
| Bottleneck Calc | JavaScript logic based on hardware tier scoring | Directional estimate |
All timing uses performance.now() rather than Date.now() because it provides higher precision (microsecond-level resolution) and is not affected by system clock changes. This is the same API used by browser developer tools and WebGL engines. For a complete hardware performance picture alongside these browser-based tools, our GPU test and CPU test can benchmark your core components directly to complement what you measure here.
Frequently Asked Questions
No. This test measures how fast your browser can render animation frames using requestAnimationFrame. It is a browser rendering speed test, not a GPU gaming benchmark. For in-game FPS numbers, you need software like MSI Afterburner, the built-in game overlay, or Steam's FPS counter. However, this browser FPS test is accurate for understanding your system's general rendering health and verifying that your monitor and browser are working at full speed. To benchmark your graphics card directly, use our GPU test which measures real shader throughput, particle rendering, and geometry performance independent of browser overhead.
There are three common reasons. First, browser hardware acceleration may be turned off — go to your browser settings and enable it. Second, your monitor's refresh rate in Windows Display Settings might still be set to 60Hz — change it to 144Hz in Settings → Display → Advanced Display. Third, if you are using an HDMI 1.4 cable, it may be limiting your monitor to 60Hz — switch to a DisplayPort cable or HDMI 2.0/2.1 for full speed. Once you have confirmed your monitor is running at its correct Hz, our UFO test is the best way to visually verify motion clarity and ghosting performance at that refresh rate.
250ms is a completely normal human reaction time. It is not bad at all. The average person reacts between 200 and 270ms depending on focus, fatigue, and age. For casual and most competitive gaming, 200–270ms is perfectly fine. Where sub-200ms times truly matter is at the highest tier of esports competitions. Also remember: your in-game reaction is affected by monitor input lag, server latency, and mouse response on top of your biological baseline. If you want to understand how your reaction time connects to overall mechanical output, tracking your APM test score alongside your reaction baseline can reveal whether speed or consistency is the bigger limiter in your gameplay.
Go to the Keyboard Tester tab and hold down 6 or more keys at the same time. If all of them light up on the layout, your keyboard supports at least 6-key rollover (6KRO). If some keys you are holding do not appear on screen, those combinations are being ghosted. True N-Key Rollover (NKRO) keyboards register every single key no matter how many are pressed — you can hold all keys at once and they will all register. Most budget keyboards only support 2KRO or 3KRO, which is enough for regular typing but can cause issues in gaming.
You can trust it as a starting point, but not as a final verdict. Our calculator scores your CPU, GPU, and RAM based on performance tier and generation, then estimates which side is the weaker link. This is useful for planning upgrades — it correctly identifies obvious mismatches like a GTX 1050 with an RTX 4080-level CPU. However, real bottlenecks vary heavily by game engine and specific settings. For accurate game-specific data, look up benchmarks for your exact CPU and GPU combination in the games you actually play. You can also run our CPU test to measure your processor's actual sustained performance under load, which often reveals throttling or thermal issues the calculator cannot account for.
No. Every calculation in this tool runs entirely in your browser using JavaScript. No results, hardware information, or keyboard inputs are sent to any server. The tool does not use cookies, analytics tracking, or any form of data collection. Your keyboard inputs in the Keyboard Tester are captured locally by the page and are never recorded or transmitted anywhere.
All modern browsers work well. Google Chrome and Microsoft Edge give the most consistent results because they have the most mature hardware acceleration support. Firefox works well but may show slightly different FPS numbers due to differences in how it handles requestAnimationFrame timing. Safari on Mac also works correctly. For best results, make sure hardware acceleration is enabled, close unnecessary tabs, and avoid running heavy background applications during your tests. If you play online games and suspect your connection is affecting perceived performance, running our ISP test alongside these browser tools will tell you whether network latency or packet loss is a factor on top of your hardware setup.
Why You Should Test Your Monitor and PC Performance Regularly
Most people never check if their monitor is actually running at its advertised refresh rate. A monitor showing 60Hz when it should be 144Hz is a common problem — and a complete waste of money you spent on the upgrade. Similarly, a keyboard with ghosting on gaming key combos can cause real in-game issues that feel like lag or network problems when they are actually hardware failures. For the same reason, it is worth periodically using our UFO test to confirm your display's motion clarity and ghosting behaviour have not changed after driver updates or new hardware installations — issues that can appear silently without any obvious warning.
Running these tests when you set up new hardware, after driver updates, or when something feels "off" about your system is simply good practice. It takes two minutes and can save hours of troubleshooting guesswork. If online games suddenly feel sluggish despite your hardware checking out, an ISP test is the next logical step — network latency and bandwidth issues frequently masquerade as local hardware problems.
Complete Guide to PC Performance Testing
Step 1 — Confirm Your Monitor Is Running at Full Speed
Use the Refresh Rate Test first. If your 144Hz monitor shows 60Hz, fix that before testing anything else. Go to Windows Display Settings, click Advanced Display Info, and change the refresh rate to the maximum your monitor supports. If it does not show the correct option, check your cable type — HDMI 1.4 does not support 144Hz at 1080p on all monitors. After confirming your Hz setting, run the UFO test to visually verify motion clarity and ghosting at your confirmed refresh rate — a number in display settings does not always mean the panel is performing cleanly at that speed.
Step 2 — Run the FPS Test to Check Browser Performance
Once your monitor is confirmed at the right Hz, run the FPS test. Your FPS should come close to matching your monitor's Hz if your system is healthy. A big gap (e.g., 40 FPS on a 144Hz monitor) in the browser test points to CPU, RAM, or hardware acceleration issues worth investigating. If you suspect your graphics card is the limiting factor, follow up with our GPU test to measure its actual rendering throughput and rule out driver issues or thermal throttling.
Step 3 — Test Your Reaction Time Under Real Conditions
Do this test when you are feeling alert and rested. Five to ten tries give you a good average. This baseline is your personal reference point. If your score suddenly gets 50ms worse, it is likely fatigue, not skill regression. Use it to track whether your gaming improvements over time are measurable. For competitive players, pairing your reaction time data with an APM test gives a fuller picture of mechanical performance — reaction speed tells you how fast you respond, while APM measures how that speed translates into consistent, high-volume in-game actions.
Step 4 — Check Keyboard Keys After Any Hardware Issue
Spilled water, a stuck key, or keys that feel different after cleaning — the keyboard tester quickly confirms whether the physical actuation is registering correctly. This takes 60 seconds and can tell you definitively if a key is dead or just sticky.
Step 5 — Use the Bottleneck Calculator Before Any Upgrade
Before spending money on a new GPU or CPU, run the bottleneck calculator with your current and planned components. If you have a big CPU bottleneck, buying a faster GPU will give minimal gains. Fix the actual bottleneck first for the best performance-per-dollar upgrade. To validate the calculator's estimates against real-world results, run our ISP test as well — in online gaming scenarios, a network bottleneck can make a CPU or GPU bottleneck feel worse than it actually is, and separating the two helps you target the right upgrade first.