Test and fix your devices, right in your browser
Free tools for your phone, speakers, headphones and screen. No app to install, no sign-up, and everything runs on your own device.
Popular tools
Audio tools
Speakers, headphones, mics, webcams and sound levels
Speaker Cleaner
Play a 165 Hz water eject sound to push water and dust out of your phone speaker.Tone Generator
Play any frequency from 1 Hz to 22 kHz, including a 1000 Hz test tone.DTMF Tone Generator
Phone keypad touch tones: play keys, dial a number and download it as a WAV.Headphone Test
Check channels, low and high tones, and how far your headphones reach.Left Right Audio Test
Make sure left and right play on the correct side, with a stereo sweep and phase test.Speaker Test
Check each speaker for rattles, buzzing or a blown driver with test sounds and a full-range sweep.Subwoofer Test
Bass test tones from 20 Hz, a falling bass sweep, rattle check and phase setup.Surround Sound Test
Check every speaker of a 5.1 or 7.1 system one by one, including the subwoofer channel.Audio Latency Test
Measure the sound delay of your headphones or speakers, and how much Bluetooth adds.One Earbud Not Working
Find out which side is silent, then fix it step by step.Decibel Meter
Measure how loud it is with your microphone: live dB, average, max and safe listening time.Online Hearing Test
Find the highest tone you can hear, try the mosquito tone and match your tinnitus pitch.Online Voice Recorder
Record your voice with pause and resume, play it back and download it as WAV. Nothing is uploaded.Webcam & Mic Test
Check your camera and microphone before a call: live preview, resolution, mic level and playback.
Screen tools
Monitors, phones, tablets and TVs
Dead Pixel Test & Fixer
Fill your screen with solid colors to find dead or stuck pixels, then try the fixer.Refresh Rate Test
See the real Hz your monitor or phone runs at, spot skipped frames and check motion.Touch Screen Test
Find dead zones, check multi-touch and catch ghost touches on phones and tablets.HDR Test
Check if your screen and browser show HDR and wide color, and how bright HDR highlights get.OLED Burn-in Test
Gray and color patterns that reveal burn-in and image retention on phones, TVs and monitors.Backlight Bleed Test
Spot light leaking around the edges of LCD monitors, laptops and TVs.Screen Resolution
What is my screen resolution? See it in real pixels, with window size, scaling, aspect ratio and color depth.Aspect Ratio Calculator
Find the aspect ratio of any width and height, resize without stretching, and get screen size from the diagonal.Color Blind Test
Ishihara-style dot plates for red-green and blue-yellow colour vision, plus a reverse test.Battery Life Calculator
How long a battery will last from mAh, Ah or Wh and the load, plus a mAh to Wh converter.TV Mount Height Calculator
How high to mount your TV: screen centre, edges, bracket height and viewing angle.Monitor Ghosting Test
See ghosting trails, overshoot halos and motion blur, and find the best overdrive setting.Screen Flicker Test
Check a flickering monitor or laptop screen with PWM, pencil and inversion patterns, and find the cause.Online Mirror
Use your camera as a mirror, or switch to a true mirror and see yourself as others do.Standing Desk Height Calculator
Desk and monitor height for your height, a standing desk height chart and a measured mode.Sim Racing FOV Calculator
True horizontal and vertical FOV for your screen and seat, curved ultrawides and triple-screen angles.Screen Size Calculator
Width and height of any TV or monitor from its diagonal, PPI, and the right TV size for your room.White Screen
An all white full screen, plus a white wallpaper in your exact resolution.Red Screen
A full red screen in one tap, a dark red night light and a red wallpaper in your resolution.Pink Screen
A full pink screen in one tap: hot pink, light pink or soft pink light, plus a pink wallpaper in your resolution.Yellow Screen
A full yellow screen in one tap: bright, warm or light yellow light, plus why an iPhone screen turns yellow.Purple Screen
A full purple screen in one tap: violet, light purple or dark purple, plus fixes for a phone or TV stuck on purple.Black Screen
A pure black full screen, plus a black wallpaper in your exact resolution.
Input & Reflex tools
Mouse, reaction time and quick tests
Mouse Test
Check every button, catch unwanted double clicks and spot a jumping scroll wheel.Mouse DPI Test
Measure your mouse's real DPI with a ruler or a bank card, then work out your eDPI.eDPI Calculator
eDPI and cm/360 for Valorant, CS2, Fortnite, Overwatch 2 and Apex, plus the same feel in other games.Mouse Acceleration Test
Is mouse acceleration on? Slow vs fast strokes, then how to turn it off on Windows, Mac and Linux.Mouse Polling Rate Test
Measure your mouse's real polling rate in Hz: live, average and peak, plus how steady it is.Touchpad Test
Check your laptop touchpad: tracking across the whole pad, clicks, two-finger scroll and pinch zoom.Controller Vibration Test
Rumble each motor of a PS5, PS4 or Xbox controller at any strength, with pulses and trigger rumble.Keyboard Test
Press every key to find dead or stuck keys, check rollover and catch keys that type twice.Spacebar Counter
See how many times you can press the spacebar in 5, 10, 30 or 60 seconds.Reaction Time Test
React to a color change or a beep and get your time in ms: average, best and median.F1 Reaction Time Test
Five red start lights, a random pause, lights out. How fast is your race start?
Classroom tools
Tools for teachers
Classroom Timer
A big visual timer for the board: shrinking pie, bar or digits, full screen and an end chime.Online Stopwatch
A precise stopwatch with laps, hundredths of a second and keyboard shortcuts. Keeps running if you reload.Random Team Generator
Paste a list of names and split it into fair random teams or groups in one click.Classroom Noise Meter
A live noise level for the board: sleeping monster, face or bar, with quiet minutes.Classroom Seating Chart Maker
Paste your class list, pick rows, pairs, groups or a U-shape, shuffle, swap and print. Names stay in your browser.Multiplication Chart
Print a 10×10 to 20×20 times table chart, filled, blank or as a practice sheet; tap a square to see its row and column.Hundreds Chart
Print a 1–100, 0–99 or 120 chart, filled, blank or with missing numbers, with skip-count shading.Number Line
Print number lines: 0–10 to 0–100, negative numbers, fractions, decimals, blank or open, up to 8 per page.Coordinate Plane
Print 4 quadrant or first quadrant coordinate grids, numbered or blank, up to 6 per page.Place Value Chart
Print a place value chart from tens and ones to billions, with decimals: blank, filled with your numbers, or as practice.Fraction Chart
Print a fraction wall, fraction circles or a fraction to decimal and mm chart in 1/16 to 1/64 inch steps.Ten Frame
Print blank ten frames, double ten frames, 0–20 ten frame cards or how-many worksheets; tap to add counters.Number Bonds
Print number bond worksheets to 5, 10 or 20 with a missing part or whole, or a blank number bond template.Telling Time Worksheets
Print read-the-clock or draw-the-hands worksheets to the hour, half hour or 5 minutes, blank clock faces, or use an interactive clock.Tally Chart
Count a class survey live with tally marks, totals and a bar graph, or print blank tally charts and tally worksheets.Fact Family
Type three numbers to get their fact family, or print fact family triangles and houses for + − or × ÷ with an answer key.Skip Counting
Print a skip counting chart from 2 to 12, missing-number worksheets, or number line jumps by 2, 5, 10 and more.Picture Graph
Make a picture graph from your class data with a key of 1, 2, 5 or 10, or print picture graph worksheets and a blank template.Counting Money
Practice counting coins on screen, or print money worksheets: count coins and bills, show an amount, making change and identify coins.Multiplication Arrays
Build arrays up to 12 × 12 and see every fact, or print array worksheets: write the sentence, repeated addition, draw arrays and division.Base Ten Blocks
Virtual base ten blocks on a place value mat with regrouping, base ten worksheets, and real-size printable blocks to cut out.
Printer tools
Test pages for inkjet and laser printers
Printer Test Page
Print a color or black and white test page to check ink, clogged nozzles, alignment and toner.Graph Paper
Print free graph paper in any grid size: 1/4 inch, 5 mm, 1 cm and more, on Letter or A4, or as dot paper.Lined Paper
Print free lined paper: wide ruled, college ruled, 8 mm or handwriting paper with a dashed midline, on Letter or A4.Printable Ruler
Print an actual-size ruler in inches and centimeters, with a credit-card check so you know the scale is right.Printable Tape Measure
Print an actual-size tape measure up to 60 in or 150 cm in strips to glue, plus a tape measure reading worksheet.Printable Ring Sizer
Find your ring size at home: a paper sizer strip, an actual-size ring size chart and a card scale check.Isometric Paper
Print isometric graph paper, isometric dot paper or hexagon paper in 1/4 in, 1/2 in, 5 mm or 1 cm, on Letter or A4.Polar Graph Paper
Print polar graph paper with 1 to 8 grids per page, angle lines in degrees, radians or both, or blank.Printable Protractor
Print a 180° or 360° protractor with 1° marks and two scales, from pocket size to full page.Cornell Notes Template
Print Cornell note sheets with a cue column, notes area and summary box, lined or blank, with an AVID-style option.
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Why FixAndTest?
- Works instantlyOpen a tool and use it. Nothing to download or install.
- Private by designTools run in your browser. Sound, camera and screen data never leave your device.
- Any deviceBuilt for phones first, and works just as well on tablets and computers.
- FreeEvery tool is free to use, as often as you need.