Most Visited
Calculators
555 Timer Calculator
Calculate 555 timer astable-mode frequency, period, and duty cycle from R1/R2/C, or solve backward for the resistors needed to hit a target frequency and duty cycle.
FreeHardware
Speaker & Headphone Test
Test your speakers and headphones right in the browser: left/right channel checks, a stereo test, a bass tone, and a 20 Hz to 20,000 Hz frequency sweep, all generated live with the Web Audio API.
FreeHardware
Ghosting Test
Test your monitor for screen ghosting and motion blur with a moving block, scrolling text, or fine-line pattern at an adjustable speed.
FreeHardware
Scroll Test
Test your mouse scroll wheel or trackpad with live direction, delta values, speed, and automatic wheel chatter detection.
FreeDownloader
Facebook Video Downloader
Paste a link to a public Facebook video and download it. No account, no extension, no Facebook login.
FreeCalculators
Acreage Calculator
Calculate acreage for rectangular, square, triangular, or circular land, converted to acres, hectares, and square meters/feet/yards.
FreeHardware
sRGB Color Test
Check your display against a 24-patch sRGB reference set: primaries, memory colors, and a neutral grey ramp, with a fullscreen patch view.
FreeHardware
Antenna Length Calculator
Calculate the physical length of a dipole, vertical, or loop antenna from an operating frequency, right in your browser.
FreeDownloader
Twitch Clip Downloader
Paste a link to a public Twitch clip and download it. No account, no extension, no Twitch login.
FreeCalculators
APR Calculator
Calculate the real APR of a loan including fees and discount points, right in your browser.
FreeCalculators
Appliance Energy Cost Calculator
Estimate the daily, monthly, and annual electricity cost of an appliance, with a running multi-appliance total.
FreeCalculators
Apgar Score Calculator
Calculate and categorize a newborn Apgar score from its five clinical signs, right in your browser.
FreeHardware
Keyboard Tester
Test every key on your keyboard in the browser: a full 101-key visual layout, key/code/modifier details, rollover and anti-ghosting stats, chatter detection, and a tested-key progress tracker.
FreeHardware
Gamma Calibration
Estimate your display's effective gamma with the classic stripe-vs-solid-patch test across five candidate gamma values, sRGB 2.2 marked.
FreeHardware
P3 Gamut Test
Compare sRGB against Display P3 across 12 hues around the color wheel to see exactly where wide-gamut displays show more vivid color.
FreeHardware
Webcam Test
Test your camera and microphone right in the browser: live preview, device switching, resolution and FPS readout, a mic level meter, and snapshot capture.
FreeDownloader
Twitter/X Video Downloader
Paste a link to a video or GIF post on X (Twitter) and download it. No account, no extension, no X login.
FreeDownloader
Mixcloud Track Downloader
Paste a Mixcloud track link and download the public stream for offline listening. No account, no extension, no Mixcloud login.
FreeDownloader
TikTok Video Downloader
Paste a TikTok video link and download it, with a watermark-free option when available. No account, no extension, no TikTok login.
FreeHardware
Backlight Bleed Test
Test your LCD screen for backlight bleed with a full-screen pure black pattern and a 3x3 scan grid, plus IPS glow guidance.
FreeImage
Add Noise Image
Add random grain or color noise to an image, right in your browser.
FreeText
Excel To HTML Table Converter
Paste from Excel or Google Sheets, or upload a .xlsx/.xls/.csv file, and get a clean HTML table with a live preview, optional styling, and numeric column alignment.
FreeText
DMARC Record Generator
Build a DMARC DNS record from plain-language fields, with staged rollout presets and a live enforcement-level indicator.
FreeDownloader
Streamable Video Downloader
Paste a Streamable video link and download it for offline viewing, for public videos. No account, no extension, no Streamable login.
FreeDownloader
Pinterest Video/Pin Downloader
Paste a Pinterest pin link and download the video or full-resolution image, for public pins. No account, no extension, no Pinterest login.
FreeCalculators
Angle Converter
Convert angles between degrees, radians, gradians, turns, arcminutes, arcseconds, and milliradians with live DMS support.
FreeCalculators
Angel Number Calculator
Discover the numerology meaning of a recurring number or your birth date Life Path Number, right in your browser.
FreeCalculators
Air Conditioner BTU Calculator
Estimate the air conditioning BTU capacity a room needs, with a multi-room whole-home total.
FreeCalculators
Advanced Zodiac Compatibility Analyzer
Analyze the astrological compatibility between two zodiac signs, right in your browser.
FreeImage
Favicon Generator
Upload an image and get a complete favicon package: favicon.ico, every PNG size browsers and devices expect, apple-touch-icon, Android icons, a site.webmanifest, and the HTML to paste in, all in one ZIP.
FreeDownloader
Odysee Video Downloader
Paste an Odysee video link and download it for offline viewing, for public videos. No account, no extension, no Odysee login.
FreeDownloader
SoundCloud Track Downloader
Paste a SoundCloud track link and download the public stream as an MP3 for offline listening. No account, no extension, no SoundCloud login.
FreeCalculators
CSR Viewer
Decode a PEM-encoded Certificate Signing Request (PKCS#10): Subject, public key, signature algorithm, and Subject Alternative Names, then verify its self-signature is actually valid.
FreeImage
Reverse Image Search
Upload a photo or paste an image URL, then search Google, Bing, Yandex, and TinEye for its source or similar images.
FreeText
Bionic Reading Converter
Convert any text into bionic reading format by bolding the first portion of each word to help you read faster and focus better.
FreeCalculators
At Bats Per Home Run Calculator
Calculate a baseball player's AB/HR power-hitting ratio, see its performance tier, compare against real MLB career leaders, and solve for the at-bats or home runs needed to hit a target ratio.
FreeHardware
Greyscale Test
Check a display for banding, shadow crushing, and highlight clipping with a real continuous 0-255 grey gradient, an interactive value readout, and a dedicated near-white patch set.
FreeHardware
Burn-in Test
Reveal OLED, plasma, or other display burn-in with solid gray, black, and white fields, plus a Flicker Boost mode that alternates gray shades to make faint marks easier to spot.
FreeHardware
Color Accuracy Test
Play an interactive color-matching game: reproduce a target color with RGB sliders and get a perceptual accuracy score.
FreeHardware
Gradient Test
Check your screen for color banding with grayscale, RGB channel, radial, and hue wheel gradient patterns, in fullscreen.
FreeCalculators
ARM Mortgage Calculator
Model the worst-case payment scenario for an adjustable-rate mortgage, with payment shock, a year-by-year schedule, and a fixed-rate comparison.
FreeCalculators
Arithmetic Mean Calculator
Calculate the arithmetic mean, median, mode, range, and both population and sample standard deviation of a dataset, with a dot plot and histogram.
FreeCalculators
Arctan2 Calculator
Calculate atan2(y, x), the angle of a point in the Cartesian plane, with quadrant detection, normalized angle, and a step-by-step breakdown.
FreeCalculators
Antilog Calculator
Calculate the antilogarithm (inverse log) of a number for base 10, e, 2, or a custom base, right in your browser.
FreeCalculators
Annuity Payout Calculator
Calculate a sustainable payout amount from a balance, or how long a fixed payment will last, right in your browser.
FreeText
Adler32 Checksum Calculator
Calculate the Adler-32 checksum of text or a file, right in your browser.
FreeImage
Adjust Gamma Image
Brighten or darken the midtones of an image with a gamma curve, right in your browser.
FreeCalculators
Add Business Days To Date
Add or subtract business days from a date, skipping weekends and optional holidays, with a full breakdown of skipped days.