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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.
FreeCalculators
Aquarium Volume & Stocking Calculator
Calculate aquarium water volume by tank shape and estimate a rough fish stocking capacity.
FreeCalculators
Aquarium Heater Wattage Calculator
Calculate the right heater wattage for your aquarium based on tank size and temperature gap.
FreeText
API Tester
Send HTTP requests to any API endpoint and inspect the response, right in your browser.
FreeCalculators
Annuity Calculator
Project how a savings balance grows with regular contributions and compound interest, right in your browser.
FreeCalculators
ANC Calculator
Calculate Absolute Neutrophil Count (ANC) from CBC values and see the NCI CTCAE neutropenia grade, right in your browser.
FreeImage
Analogous Color Scheme
Generate a harmonious analogous color palette from any base color, right in your browser.
FreeCalculators
Age Calculator
Calculate exact age in years, months, and days, plus fun extras like your age on other planets.
FreeVideo
Add Watermark To Video
Add a text or image watermark onto a video and export it, right in your browser.
FreeCalculators
Add To A Date
Add or subtract years, months, weeks, and days from a date, right in your browser.
FreeImage
Add Text To Image
Add one or more custom text captions onto an image, right in your browser.
FreeText
Add Text Each Line
Insert the same text into every line, at the start, end, an exact position, or next to a match, right in your browser.
FreeImage
Adjust HSL Image
Shift hue, saturation, and lightness on an image with live sliders, right in your browser.
FreeImage
Bulk Batch Add Noise Image
Add the same grain or color noise effect to many images at once, right in your browser.
FreeImage
Add Line To Image
Draw one or more lines onto an uploaded image by dragging or precise coordinates, then download the result at full resolution.
FreeCalculators
Actual Cash Value Calculator
Estimate an item's actual cash value (ACV) for insurance purposes from replacement cost and straight-line depreciation.
FreeCalculators
Acres to Perches Converter
Convert between acres and square perches (rods/poles) in either direction, live as you type, with square meters equivalent.
FreeCalculators
Acres to Hectares Converter
Convert between acres and hectares in either direction, live as you type, with a quick-reference table and square meters equivalent.
FreeCalculators
Acceleration Calculator
Solve for acceleration, final velocity, initial velocity, or time, with g-force and distance-traveled breakdowns.
FreeCalculators
A/B Test Significance Calculator
Check whether an A/B test result is statistically significant, with p-value, z-score, and a confidence interval for the lift.
FreeCalculators
Absolute Value Equation Solver
Solve |ax + b| = c step by step, with both cases explained and verified.
FreeCalculators
529 College Savings Calculator
Project 529 education savings growth and see what percentage of a future college cost your savings are on track to cover.
FreeCalculators
401(k) Calculator
Project your 401(k) retirement savings growth with employer match, salary increases, and inflation-adjusted real value.
FreeCalculators
3-Phase Power Calculator
Find real, apparent, and reactive power from voltage, current, and power factor, or solve for current from a known load. Free, private, runs in your browser.
FreeCalculators
3D Surface Plotter
Plot any function z = f(x, y), from a paraboloid to a saddle to a Gaussian, as a rotatable, color-coded 3D wireframe surface. Free, private, runs in your browser.
FreeCalculators
3D Distance Calculator
Find the straight-line distance between two points in 3D space, with midpoint, 2D, and Manhattan distance breakdowns included. Free, private, runs in your browser.
FreeCalculators
1031 Exchange Calculator
Estimate deferred and taxable gain on a 1031 like-kind property exchange, with a recapture vs. capital gains tax breakdown and a 45/180-day deadline tracker. Free, private, runs in your browser.
FreeGame
Spin the Wheel (Wheel of Names)
Turn any list into a spinning wheel and get a fair random pick in seconds. Free, no sign-up, everything runs in your browser.
FreeVideo
Webcam Video Recorder
A real online camera in your browser: record video with optional microphone audio, take photos, choose your resolution (480p/720p/1080p), pause and resume, add a 3-second countdown, and download everything as standard video or PNG files.
FreeHardware
Battery Health
Live battery percentage, charging state, and time estimates, plus a session-based full-charge runtime estimate and cycle usage tracker, low-battery and full-charge alerts, battery care tips, and direct steps to check your real battery health on Windows, macOS, Chromebook, and iPhone.
FreeMusic
Pitch Detector
A real-time instrument and vocal tuner in your browser: note name, frequency, and cents deviation from your microphone, with guitar/bass/ukulele/violin presets, adjustable A4 reference pitch, and a pitch history graph.
FreeHardware
Mouse Test
Test every part of your mouse in the browser: buttons and side buttons, double-click chatter detection, a click speed (CPS) test, scroll wheel, drag and drop, cursor polling rate, and a click accuracy game.
FreeText
List Randomizer
Shuffle any list, pick random winners for giveaways, and split entries into even groups, all in your browser with an unbiased Fisher-Yates shuffle.
FreeText
Line Counter
An advanced line counter that instantly analyzes your pasted text: duplicate/empty line detection, comment line filtering, regex-powered find & replace, sorting, and prefix/suffix insertion.