Most Visited
Calculators
Absolute Value Calculator
Find the absolute value of a number or arithmetic expression with a step-by-step explanation, or process a whole batch list at once.
FreeCalculators
1099 Tax Calculator
Estimate your self-employment tax and federal income tax on 1099 income, with a quarterly payment breakdown and real IRS deadline dates. Free, private, runs in your browser.
FreeHardware
Screen & Monitor Tester
Check a laptop, monitor, or TV before you buy it secondhand: dead/stuck pixel sweep, light bleed and IPS glow test, burn-in and banding check, refresh rate measurement, motion/ghosting test, and a black/white level test.
FreeDownloader
Bandcamp Track Downloader
Paste a Bandcamp track link and download the public stream as an MP3 for offline listening. No account, no extension, no Bandcamp login.
FreeText
Cron Expression Generator
Build and parse cron expressions with a live field editor, plain-English description, and the next 5 actual run times. Supports presets, @ shortcuts, and the optional 6-field seconds variant.
FreeText
Secrets/Config Redactor
Paste a .env or config file and automatically mask API keys, passwords, and tokens next to sensitive key names or known secret formats (AWS, GitHub, Stripe, JWT, PEM). Safe to then paste into a chat AI or bug report.
FreeText
ASCII Art Generator
Turn typed text or an uploaded image into ASCII art. Choose a font style or character ramp, preserve color, and export as plain text or PNG.
FreeGame
Amidakuji (Ladder Lottery Generator)
Generate a random, fair "ghost leg" ladder lottery (amidakuji) that pairs participants with outcomes one-to-one. Trace each line down the ladder to reveal results, or show them all at once.
FreeImage
Poster Maker
Split any image into printable A4/Letter/A3 pages you can tape together into one big poster, with adjustable overlap for easy alignment, entirely in your browser.
FreeImage
RGB Channels Image
Split a photo into its Red, Green, and Blue channels, in grayscale or colorized form, merge them back, and download as a ZIP, directly in your browser.
FreeImage
Random Bitmap Generator
Generate a random bitmap pattern of greyscale or colored squares, with a reproducible seed and batch ZIP download, directly in your browser.
FreeImage
Filters Image
Apply Instagram-style photo filters like Vintage, Lomo, or Sunrise, with intensity, vignette, and greyscale controls, directly in your browser.
FreeImage
Image Sharpen & Detail
Sharpen an image, apply edge enhancement, run edge detection, or remove noise, directly in your browser.
FreeImage
Image Stylize Effects
Apply emboss, glow, vignette, pixelate, or censor/redact effects to an image directly in your browser.
FreeImage
Image Split & Merge
Split an image into a grid of pieces, or merge multiple images into one, directly in your browser.
FreeImage
Image Flip & Rotate
Flip an image horizontally or vertically, or rotate it by 90°, 180°, or any custom angle directly in your browser.
FreeImage
Image Tint Effects
Apply Colorize (single-color tint) or Duotone (two-color gradient map) effects to an image with a live preview.
FreeImage
Image Histogram Equalizer
Boost contrast using histogram equalization, across the whole image or just a selected area.
FreeImage
Image Levels & Threshold
Adjust tonal range with Clip, Stretch (Levels), or Threshold (black & white) modes, with a live preview.
FreeImage
Image Channel Mixer
Independently scale the red, green, and blue channel intensity of an image with a live preview.
FreeImage
Image Vibrance Adjuster
Boost or reduce color vividness in an image while protecting already-vivid colors and grays, unlike a flat saturation change.
FreeImage
Brightness Contrast Image
Adjust the brightness and contrast of an image in your browser with a live preview, then download the result.
FreeCalculators
Box and Whisker Plot Maker
Turn one or more datasets into box-and-whisker plots with five-number summary, mean, standard deviation, and outlier detection.
FreeImage
Blurred Frame Images Generator
Fit your photo into a square or other aspect ratio without cropping, filling the extra space with a blurred, zoomed copy of the image.
FreeCalculators
Blood Donation Time Calculator
Calculate your next eligible blood donation date based on your last donation and donation type, using common waiting-period guidelines.
FreeImage
Blend Colors
Blend two colors together with an adjustable balance, using simple RGB, gamma-correct, or HSL blending.
FreeCalculators
Bitwise Calculator
Perform AND, OR, XOR, NAND, NOR, XNOR, NOT, and bit shift operations on binary, octal, decimal, or hexadecimal numbers.
FreeGame
Bingo Card Generator
Generate unique, print-ready 5x5 bingo cards with classic 1-75 numbers, custom words, or emojis, in a choice of color themes.
FreeCalculators
Binary Calculator
Add, subtract, multiply, and divide binary numbers directly, with results shown in binary and decimal, plus a binary/decimal converter.
FreeCalculators
Big Number Calculator
Perform exact arithmetic on numbers far larger than a normal calculator can handle: addition, subtraction, multiplication, division, exponentiation, square root, factorial, modulo, GCD, and LCM.
FreeCalculators
Betting Odds Converter
Convert betting odds between American, Decimal, Fractional, and implied probability formats, with payout, profit, and bookmaker margin (vig) calculations.
FreeCalculators
Basic Calculator
A simple, free online calculator for everyday arithmetic, with memory storage, scientific-notation entry, and keyboard support.
FreeCalculators
Pressure Converter
Convert pressure between Pa, kPa, MPa, bar, PSI, atm, torr, and inHg all at once, with a visual gauge and presets for tires, bikes, and scuba tanks.
FreeText
Bar Graph Maker
Turn simple label,value data into a customizable bar chart with 8 color themes, orientation, sorting, negative-value support, instant stats, and SVG/PNG export.
FreeText
Backronym Generator
Turn any acronym or word into a backronym across 6 tones and 5 sentence patterns, with custom words per letter and Memorability/Pronounceability scoring.
FreeCalculators
Average Rate Of Change Calculator
Calculate the average rate of change of any function f(x) (polynomials, trig, logs, roots, and more) over an interval [a, b], with a graph of the function and its secant line.
FreeCalculators
Auto Loan Calculator
Estimate a car loan's monthly payment, total interest, and total cost of ownership, accounting for down payment, trade-in (including negative equity), incentives, sales tax, and fees.
FreeHardware
Refresh Rate Test
Measure your display's real, live refresh rate right in your browser using requestAnimationFrame timing, and catch a monitor advertised at 144Hz or higher that is really only running at 60Hz.
FreeHardware
Brightness Test
Test your screen with a 10-step brightness ladder and a 9-zone fullscreen uniformity check to spot clouding or uneven backlighting.
FreeHardware
Color Banding Test
See exactly what 6-bit vs 8-bit color banding looks like with an honest, adjustable mathematical quantization simulation.
FreeHardware
RGB Channel Test
Test your screen for dead, stuck, or hot pixels with pure red/green/blue channel isolation plus any custom color via hex or picker.
FreeHardware
Touch Screen Test
Test a touchscreen with multi-touch visualization, a free-draw precision canvas, and a dead-zone grid coverage scan.
FreeHardware
HDR Test
Check what your browser and display report about HDR and wide color gamut support, with a real sRGB vs Display P3 visual comparison.
FreeText
Atbash Cipher Tool
Encode and decode text with the Atbash cipher in classic, digit, and Hebrew variants, with a live mirror-pair reference and character mapping table.
FreeText
Argon2 Hash Generator
Generate and verify Argon2id/Argon2i/Argon2d password hashes entirely in your browser, with adjustable memory cost, time cost, and parallelism.
FreeCalculators
Area Calculator
Calculate the area of rectangles, triangles, trapezoids, circles, sectors, ellipses, and parallelograms, with a live diagram and instant unit conversions.
FreeCalculators
Arcsin Calculator
Calculate the arcsine (inverse sine) of a value in degrees or radians, with special-angle detection and a unit circle visualization.
FreeCalculators
Arccos Calculator
Calculate the arccosine (inverse cosine) of a value in degrees or radians, with special-angle detection.