ChaosLens
Free browser-based tools for image processing, health calculations, keyboard and display testing, random generation, charts, unit conversion, and everyday utilities. Many tools run locally in your browser, keeping files and inputs on your device.
All Tools
69 tools available. Select one to open it here.
Arc Diagram Maker
Build an arc diagram from source, target, weight, and group data, then inspect, style, and export the result.
Centimeter, Inch, and Feet-and-Inches Converter
Convert centimeters, total inches, and feet plus inches in either direction.
GIF Frame Player
Upload a GIF to play it frame by frame, reverse the preview, inspect delays, and download the current composited frame as PNG.
Image Splitter
Split images locally by crop boxes, draggable lines, grids, or fixed pixel tiles.
Mac Keyboard Test
Test a Mac keyboard one key at a time to see which standard keyboard events the browser recognizes and find keys that are not tested or captured.
Macro Calculator
Calculate daily protein, fat, and carbohydrate targets from calories, weight, and your preferred allocation rule.
Mouse Single- and Double-Click Test
Click the test area to distinguish separate clicks, valid double-click intervals, and suspected switch bounce.
Random Number Generator
Generate random integers or decimals within a custom range, with quantity, uniqueness and sorting controls.
Carbohydrate Needs Calculator
Enter daily calories, weight, goal, training volume, and carbohydrate percentage to estimate daily carbohydrate grams, calories, and a reference range.
BMI Calculator
Calculate BMI, a healthy weight range, and adult screening categories from your height and weight.
Increase Image File Size
Increase JPG, PNG, and WebP file sizes locally without changing pixel dimensions.
Keyboard CPS Test
Choose a duration and key mode, tap quickly, and review average CPS, the one-second rolling peak, and valid key count.
List Randomizer
Paste or upload a list, clean blank and duplicate lines, then shuffle the remaining items into a new order.
Ideal Weight Calculator
Compare four classic ideal-weight formulas and the adult BMI reference range using your height and sex.
Keyboard Rollover Test
Choose a combination to press at once, then hold several keys to see which key events the browser receives at the same moment, the maximum simultaneous count, and possible missing keys.
Random Item Picker
Paste a list of items, pick one or more entries at random, and review the remaining items and draw history.
Touchscreen Test
Use Touchscreen Test in the browser for a focused display check or calculation. The page keeps the work on this device.
Body Fat Goal Calculator
Enter your current weight, body fat percentage, and daily calorie deficit to estimate your target weight, amount of fat you need to lose, and the time frame.
Coin Flip Simulator
Choose how many flips to run, simulate a fair coin, and review the running counts, observed shares, and recent rounds.
Keyboard Chatter Test
Choose a key and complete repeated press-and-release cycles to flag intervals below a threshold and review the suspected chatter rate and stability.
Black Level Test
Step through near-black patches from 1 to 32 and record the gray level that first separates from a pure-black background on your display.
Keyboard Dropout Test
Hold a target key and analyze steady-state browser auto-repeat intervals to find suspected long gaps and judge whether the sample is sufficient.
Wedding Seating Chart Maker
Add your guest list and table assignments to create a wedding seating chart, review assignments, choose a design, and print or export it as PDF.
Waist-to-Hip Ratio Calculator
Enter sex, waist circumference, and hip circumference to calculate WHR and view common WHO adult reference cutoffs and measurement guidance.
Waist-to-Height Ratio Calculator
Enter waist circumference, height, and optional age to calculate WHtR, view a continuous adult reference band, and compare waist size with half your height.
Backlight Bleed Test
Use a full-screen black display to inspect edge and corner bright spots, then record the conditions, severity, and affected regions.
Body Fat Calculator (U.S. Navy Method)
Estimate body fat percentage, fat mass, and lean mass from sex, height, weight, and body circumferences using the classic U.S. Navy method.
Keyboard Latency Test
Press a normal key repeatedly to estimate the scheduling delay from the browser event timestamp to the start of JavaScript handling, then review the median, P95, and sample distribution.
TDEE Calculator
Enter sex, age, height, weight, and activity level to estimate BMR, TDEE, and a maintenance-calorie range, with steps and training minutes to check the activity factor.
Wedding Menu Card Maker
Build a wedding menu from courses and descriptions, choose a coordinated design, optionally personalize it with guest names and meal selections, then print or export PDF.
Calorie Deficit Calculator
Enter TDEE, select fat loss, maintenance or muscle gain mode, and instantly calculate target calories, daily difference, theoretical weekly change and planning range.
Caffeine Intake Calculator
Enter drink servings, volume, and caffeine per serving to estimate daily caffeine, source shares, and an adult reference comparison.
Sugar Intake Calculator
Enter daily calories and sugar sources to calculate added sugar, free sugars, and their share of energy.
Weight loss time calculator
Enter your current weight, target weight, and weekly weight loss rate to estimate the weeks required, target date, and planning range.
Keyboard Polling Rate Test
Alternate between two ordinary keys to estimate the upper bound of the browser's non-repeat key-event frequency, then inspect P10 gaps, stability, and sample distribution. The result cannot certify hardware polling rate.
Random Letter Generator
Generate one or more random English letters while controlling case, repeats, excluded letters, and sorting.
Wedding Favor Tag Maker
Enter one or more favor-tag messages, choose copies and tag size, then generate a printable Letter sheet of wedding favor tags.
Random String Generator
Choose a length, quantity, and character set to create one or more random strings directly in your browser.
Typing Speed Test
Choose a practice passage from ChaosLens's eight default languages and measure net speed, gross speed, accuracy, uncorrected errors, corrections, and completion progress locally in your browser.
Water Intake Calculator
Estimate a daily beverage range from your weight, activity and heat or sweating, while keeping total-water AI separate.
Wedding Invitation Maker
Enter couple names, date, ceremony time, venue and RSVP details to create a printable wedding invitation.
Wedding Vendor Tip Calculator
Enter vendor costs and your chosen percent, fixed or per-person tip rules to calculate a wedding tip-envelope plan.
JavaScript Keyboard Event Tester
Focus the test area and press keys to inspect the keydown, keyup, key, code, location, repeat, modifier, composition, and timing data that this browser receives.
Random Hex Generator
Generate random hexadecimal data by exact byte count or HEX character count, with a clear view of character length, byte equivalent, and random bits.
Keyboard Repeat Rate Test
Hold a chosen key to measure the first auto-repeat delay, the steady repeat interval, and repeats per second reported by the browser, then review interval stability. The result reflects operating-system and browser events, not the keyboard's hardware polling rate.
Keyboard Layout Detector
Sample the browser's code-to-key mapping, compare five candidate character layouts, and review the leading layout, conflicts, and confidence. Operating-system settings are not read.
Color Banding Test
Compare controlled gradients, quantization, and dithering to record visible bands, level jumps, or grain on a display.
Hotkey and Combination Tester
Choose a shortcut combination and press it in the capture area to see whether this browser receives every target key, left/right modifier, and extra key.
Keyboard Layout Analyzer
Enter Latin text or recorded key sequences to compare QWERTY, Dvorak, and Colemak by key frequency, finger load, and adjacent-key patterns.
Monitor Color Accuracy Test
Use reference patches for a visual cast check, or enter measured Lab data to calculate CIEDE2000 ΔE00.
Key Hold Duration Test
Hold a chosen key and release it repeatedly to measure the duration of each browser keyboard event.
Dead Pixel Test
Clean the screen, switch through six full-screen solid colors, and mark the locations of fixed bright, dark, or stuck-color pixels.
Grayscale Test
Display discrete grayscale, near-black, and near-white levels to record which adjacent steps remain distinguishable, along with neutral color cast and regional unevenness.
Remove Prefixes from Words
Remove a chosen prefix from detected words while leaving other text and separators in place.
Monitor Color Test
Show controlled colors and gradients full-screen to check dead pixels, tint, uniformity, and visible rendering issues.
Monitor Color Calibration Guide
Follow a practical five-step monitor setup for brightness, contrast, gamma, white point, RGB balance, and a final visual check.
Monitor Color Gamut Test
Compare browser-reported sRGB, Display-P3, and Rec.2020 support with color patches, gradients, and a readiness checklist.
Monitor Contrast Test
Use black, white, window, and checker patterns to inspect shadow detail, highlight clipping, and perceived contrast.
Red Screen
Use Red Screen in the browser for a focused display check or calculation. The page keeps the work on this device.
Green Screen Test
Open a pure green fullscreen to inspect the green channel, pixel anomalies, and large-area uniformity, with optional framing guides.
Blue Screen
Show a standard pure-blue background in one click, enter full screen, and optionally leave automatically after a timer.
Gray Screen Test
Show calibrated gray levels in fullscreen to observe panel uniformity, tint, and near-black behavior.
Orange Screen
Use Orange Screen in the browser for a focused display check or calculation. The page keeps the work on this device.
4:4:4 Chroma Subsampling Test
Render colored text and one-pixel patterns to visually check whether a display path preserves chroma detail.
LCD Pixel Inversion Test
Show high-frequency alternating pixel patterns and record visible flicker, scan lines, or pixel-walk effects on an LCD.
Display Test Card Generator
Choose a resolution and test layers to create PNG or SVG cards for TVs, monitors, and projectors.
Square GIF Maker
Upload a GIF, choose the effect or layout you want, and create a new animation locally in your browser with Square GIF Maker.
Single-Frame GIF Generator
Set the options for Single-Frame GIF Generator and generate the animation locally in your browser; no source file is required.
1×1 Pixel GIF Generator
Set the options for 1×1 Pixel GIF Generator and generate the animation locally in your browser; no source file is required.
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