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Business Tools (18)
Professional business tools for invoicing, quotes, and receipts. Streamline your workflow with browser-based utilities.
Break-Even Calculator
Find the units and revenue needed to break even.
Car Loan Calculator
Estimate car loan monthly payments, total paid, and interest.
CPC Calculator
Calculate cost per click, total ad spend, or clicks for marketing campaigns.
CPM Calculator
Calculate cost per thousand impressions for ads, campaigns, and sponsorships.
Crypto Profit Calculator
Calculate crypto profit, loss, net proceeds, and ROI percentage.
Depreciation Calculator
Calculate straight-line depreciation, accumulated depreciation, and book value.
EBITDA Calculator
Calculate EBITDA, EBITDA margin, and operating profit from basic business inputs.
Email Signature Generator
Create a clean HTML email signature from your name, role, company, and links.
Freelance Hourly Rate Calculator
Calculate a sustainable freelance hourly rate from income goals, expenses, and billable hours.
Inflation Calculator
Estimate how inflation changes the future cost of money over time.
Investment ROI Calculator
Calculate investment return, net profit, and ROI percentage in your browser.
Invoice Generator
Create professional invoices for your business. Add line items, apply tax and discounts, and download or print instantly.
Markup Calculator
Calculate markup, profit, margin, or selling price from cost.
Mortgage Payoff Calculator
Estimate how extra payments change your mortgage payoff timeline.
Profit Margin Calculator
Calculate profit, markup, margin, revenue, and cost for products or services.
Quote Generator
Create simple printable quotes for clients with line items, totals, and validity dates.
Receipt Generator
Create a simple printable payment receipt with customer, method, date, and amount.
ROAS Calculator
Calculate return on ad spend from revenue and advertising cost.
Construction & Home Improvement (20)
Free construction, landscaping, DIY, and home improvement calculators for material estimates.
Asphalt Tonnage Calculator
Estimate asphalt tons from paving area and thickness.
Brick Mortar Calculator
Estimate brick count and mortar bags from wall area.
Concrete Slab Calculator
Estimate concrete volume for slabs, patios, pads, and footings.
Deck Lumber Estimator
Estimate deck boards from deck size and board width.
Drywall Sheet Calculator
Estimate drywall sheet count from wall and ceiling area.
Fence Post Calculator
Calculate how many fence posts are needed from fence length and spacing.
Grass Seed Calculator
Estimate grass seed pounds from lawn area and seed rate.
Gravel Tonnage Calculator
Estimate gravel tons from area, depth, and material density.
Insulation R-Value Calculator
Combine insulation layers and estimate added R-value needed.
Lumber Board Foot Calculator
Calculate board feet from lumber dimensions and quantity.
Mulch Yardage Calculator
Estimate mulch cubic yards from bed size and depth.
Paint Gallon Calculator
Estimate gallons of paint from area, coats, and coverage.
Paver Stone Calculator
Estimate paver count from patio area and paver size.
Rebar Weight Calculator
Estimate total rebar weight from bar size, length, and quantity.
Retaining Wall Calculator
Estimate retaining wall block count from wall size and block face area.
Roofing Shingle Calculator
Estimate roofing squares and bundles from roof area.
Soil & Topsoil Calculator
Estimate cubic yards of soil or topsoil from area and depth.
Stud Framing Calculator
Estimate wall studs and plates for framed walls.
Tile Count Calculator
Estimate how many tiles you need for floors, walls, or backsplashes.
Wallpaper Roll Calculator
Estimate wallpaper rolls from wall area and roll coverage.
Text Tools (20)
Text manipulation tools for counting, cleaning, converting case, and removing duplicates.
Add Line Numbers
Add line numbers to plain text or code snippets.
Binary to Text Converter
Convert binary character codes into readable text.
Case Converter
Convert text to uppercase, lowercase, title case, sentence case, and more.
Character Counter
Count characters with or without spaces, check max length, and see remaining characters.
Find and Replace Text
Find and replace words, phrases, or patterns in text instantly.
Hex to Text Converter
Convert hexadecimal byte values into readable text.
Line Sorter
Sort lines alphabetically, reverse order, and remove empty lines.
Morse Code Translator
Translate text to Morse code and Morse code back to text.
Remove Duplicate Lines
Remove duplicate lines from text. Keep or remove duplicates with case-sensitive and trim options.
Remove Empty Lines
Remove blank lines from pasted text while keeping the remaining lines in order.
Slug Generator
Create clean SEO-friendly URL slugs from titles and text.
String Length Calculator
Count string length, characters without spaces, words, and lines.
Strip HTML Tags
Remove HTML tags and extract clean plain text.
Text Cleaner
Remove extra spaces, empty lines, duplicate lines, and clean up your text.
Text Diff Checker
Compare two text blocks line by line in your browser.
Text Reverser
Reverse text characters instantly in your browser.
Text to Binary Converter
Convert plain text into binary character codes.
Text to Hex Converter
Convert plain text into hexadecimal byte values.
Word Counter
Count words, characters, sentences, paragraphs, and reading time instantly.
Word Frequency Counter
Count repeated words and find the most common terms in text.
Developer Tools (37)
Essential tools for developers: JSON formatter, encoder/decoder, and more.
ASCII Converter
Convert text to ASCII codes or ASCII codes back to text.
Base64 Encoder/Decoder
Encode text to Base64 or decode Base64 to text. Fast, secure, and private.
Binary Calculator
Add, subtract, multiply, or divide binary numbers.
Color Converter
Convert HEX colors to RGB and HSL with a live preview.
Cron Expression Generator
Build cron expressions with fields and common schedule presets.
CSS Minifier
Minify CSS code in your browser to reduce file size and clean up stylesheets.
CSS Unit Converter
Convert CSS px, rem, em, percent, vw, and vh values quickly.
CSV to JSON Converter
Convert CSV rows into formatted JSON locally.
CSV to Table Viewer
Paste CSV data and view it as a clean table instantly.
Curl To Fetch Converter
Convert common cURL commands into JavaScript fetch snippets.
Hash Generator
Generate SHA hashes from text using your browser crypto API.
Hex Calculator
Calculate with hexadecimal numbers and see decimal equivalents.
HTML Entity Encoder/Decoder
Encode and decode HTML entities for safe web text and markup.
HTML Formatter
Format messy HTML into readable, indented code directly in your browser.
HTML Minifier
Minify HTML by removing comments and extra whitespace in your browser.
Image Compressor
Compress JPG, PNG, and WebP images in your browser with quality and resize controls.
Image Resizer
Resize images to exact dimensions in your browser and download the result.
JavaScript Minifier
Minify JavaScript snippets in your browser by removing comments and extra whitespace.
JSON Formatter
Format, minify, and validate JSON data. See clear error messages with line numbers.
JSON to CSV Converter
Convert JSON arrays into CSV files in your browser.
Json To XML Converter
Convert JSON objects into simple XML in your browser.
JSON to YAML Converter
Convert JSON data into a readable YAML-style format.
JSON Validator
Validate JSON and find syntax errors instantly in your browser.
JWT Decoder
Decode JSON Web Tokens locally in your browser without sending tokens to a server.
JWT Validator
Decode a JWT token and inspect its header, payload, and signature presence.
Markdown Previewer
Preview Markdown and copy clean HTML in your browser.
Meta Tag Generator
Generate title, description, canonical, Open Graph, and Twitter tags.
Regex Tester
Test regular expressions against sample text and view matches.
Robots.txt Generator
Create a simple robots.txt file with sitemap and disallow rules.
SHA256 Hash Generator
Generate a SHA-256 hash from text using your browser.
SHA512 Hash Generator
Generate a SHA-512 hash from text using your browser.
SQL Formatter
Format simple SQL queries for easier reading.
Timestamp Converter
Convert Unix timestamps to readable dates and convert dates back to Unix time.
URL Encoder/Decoder
Encode or decode URLs and text for safe web transmission.
UUID Generator
Generate secure random UUID v4 identifiers in your browser.
XML Formatter
Format and clean XML markup for easier reading and debugging.
YAML to JSON Converter
Convert simple YAML key-value content into JSON.
Workplace & Pay (10)
Free workplace, payroll, pay, shift, commission, and employee planning calculators.
401(k) Contribution Calculator
Estimate annual 401(k) contributions, employer match, and simple multi-year totals.
Commission Payout Calculator
Calculate estimated commission payout from sales, commission rate, base pay, and bonus.
Freelance Tax Withholding Calculator
Estimate freelance tax reserves and take-home amount from income and expenses.
Hourly Paycheck Calculator
Estimate gross pay, deductions, and net pay for hourly work.
Overtime Pay Calculator
Estimate regular pay, overtime pay, and total gross pay from hours and rate.
Per Diem Calculator
Estimate per diem reimbursement from daily rates, eligible days, and meal deductions.
Severance Pay Calculator
Estimate gross severance pay from weekly pay, years of service, and weeks-per-year formula.
Shift Differential Calculator
Estimate extra pay from evening, night, weekend, or special shift differentials.
Substitute Teacher Pay Calculator
Estimate substitute teacher gross and net pay from daily rate and days worked.
Tip Pool Split Calculator
Split a tip pool evenly or by hours worked using a browser calculator.
Generators (4)
Generate QR codes, passwords, and other useful items instantly.
Lorem Ipsum Generator
Generate placeholder text for designs, mockups, and layouts.
Password Generator
Generate secure, random passwords with customizable options. Copy and use instantly.
QR Code Generator
Generate QR codes for text, URLs, WiFi credentials, and more. Download as PNG.
Random Number Generator
Generate secure random numbers within a custom range.
Kitchen & Recipe (11)
Free kitchen conversion, recipe scaling, baking, coffee, and cooking-time calculators.
Air Fryer Cooking Time Converter
Convert oven cooking time and temperature into air fryer estimates.
Baking Ingredient Scaler
Scale a baking ingredient amount from original servings to desired servings.
Coffee Water Ratio Calculator
Calculate coffee-to-water ratio in grams, cups, and ounces.
Egg Substitution Calculator
Calculate common egg substitutes such as applesauce or flax eggs for baking.
Liquid Measurement Converter
Convert cups, tablespoons, and teaspoons into milliliters and fluid ounces.
Recipe Multiplier Divider
Multiply or divide recipe ingredient amounts for batch resizing.
Slow Cooker To Oven Time Converter
Estimate oven time from slow cooker low or high cooking times.
Sourdough Hydration Calculator
Calculate sourdough hydration including starter flour and water contribution.
Sugar To Honey Converter
Convert sugar amount to an estimated honey substitution and liquid reduction.
Turkey Thaw Time Calculator
Estimate turkey thaw time by refrigerator or cold-water method.
Yeast Conversion Calculator
Convert instant yeast to active dry yeast, fresh yeast, and approximate grams.
Calculators (30)
Calculate percentages, discounts, and other common calculations.
Age Calculator
Calculate exact age in years, months, days, and total days from a birth date.
Amortization Calculator
Estimate loan payment, total interest, and a simple amortization schedule.
Compound Interest Calculator
Estimate future value, total contributions, and interest earned with compounding.
Date Difference Calculator
Calculate days, weeks, months, and years between two dates.
Day of the Week Calculator
Find the weekday for any date.
Decimal to Fraction Converter
Convert decimals into simple fraction approximations.
Discount Calculator
Calculate sale price, savings, and final total after discount.
Factorial Calculator
Calculate factorial values for whole numbers.
Fraction to Decimal Converter
Convert fractions into decimal values.
GCD LCM Calculator
Find the greatest common divisor and least common multiple.
GPA Calculator
Calculate GPA from grades and credit hours.
Hourly to Salary Calculator
Convert hourly pay into annual, monthly, and weekly salary estimates.
Leap Year Checker
Check whether a year is a leap year.
Loan Calculator
Estimate monthly payment, total interest, and total cost for a loan.
Matrix Calculator
Calculate a 2x2 matrix determinant and inverse.
Percentage Calculator
Calculate percentages, percentage increase/decrease, and solve common percentage problems.
Percentage Increase Calculator
Calculate percentage increase or decrease between two values.
Prime Number Checker
Check whether a whole number is prime.
Probability Calculator
Calculate independent event probabilities.
Roman Numeral Converter
Convert numbers to Roman numerals and Roman numerals back to numbers.
Salary to Hourly Calculator
Convert annual salary into hourly, weekly, and monthly pay estimates.
Sales Tax Calculator
Add or remove sales tax from a price with any tax rate.
Scientific Calculator
Evaluate common scientific calculator expressions in your browser.
Simple Interest Calculator
Calculate simple interest and total amount from principal, rate, and time.
Standard Deviation Calculator
Calculate sample standard deviation from a list of values.
Time Duration Calculator
Calculate time between two times and subtract breaks.
Timer & Stopwatch
Use a simple browser timer and stopwatch with no app install.
Unit Converter
Convert length, weight, temperature, volume, and speed units instantly.
Variance Calculator
Calculate sample variance from a list of values.
VAT Calculator
Calculate VAT, tax-inclusive, and tax-exclusive prices instantly.
Privacy-Friendly Tools (7)
Tools that process everything locally. Your data never leaves your device.
Browser Database Backup
Export and import RunX local IndexedDB data from this browser.
Browser Storage Inspector
View localStorage keys and IndexedDB counts saved by RunX tools in this browser.
Local Bookmark Manager
Save private bookmarks in this browser with JSON export.
Local Expense Tracker
Track simple expenses locally in your browser and export CSV.
Local Notes
Write private notes saved only in this browser.
Local Reading List
Save articles to read later using local browser storage.
Local To-Do List
Manage tasks saved only in this browser.
Aesthetic Text Tools (16)
Unicode text generators for aesthetic fonts, glitch text, blank space, Discord formatting, and copy-paste styles.
Aesthetic Font Changer
Turn plain text into spaced aesthetic text for bios and captions.
Blank Space Copy Paste
Generate blank and invisible-looking spacing characters for copy and paste.
Bold Text Generator
Convert letters and numbers into bold Unicode characters.
Bubble Text Generator
Convert letters and numbers into bubble Unicode characters.
Cursive Text Converter
Convert plain text into script-style Unicode letters.
Discord Text Formatter
Format Discord messages with bold, italic, code, quote, spoiler, and heading styles.
Fancy Font Generator
Create several Unicode text styles from one plain input.
Glitch Text Converter
Create glitch-style text using Unicode marks and symbol substitutions.
Invisible Character Generator
Copy zero-width and invisible Unicode characters for testing and formatting.
Mirror Text Generator
Mirror and reverse text for stylized usernames, posts, and messages.
Small Caps Text Generator
Convert text into small caps Unicode style where supported.
Strikethrough Text Generator
Add strikethrough styling to text using Unicode combining characters.
Underlined Text Generator
Add underline styling to text using Unicode combining characters.
Upside Down Text Converter
Flip text upside down using Unicode replacement characters.
Vaporwave Text Converter
Convert text into full-width vaporwave style.
Zalgo Text Generator
Add chaotic combining marks above and below text for spooky or glitchy styles.
Lifestyle Calculators (9)
Everyday lifestyle calculators and converters for pets, sizing, luggage, apparel, and simple personal estimates.
Belt Size Calculator
Estimate belt size from pants waist size.
Bra Size Calculator
Estimate bra band and cup size from bust and underbust measurements.
Cat Age Calculator
Estimate a cat age in human years using common cat-age conversion rules.
Clothing Size Converter
Estimate general clothing size from chest and waist measurements.
Dog Age to Human Years Calculator
Estimate a dog age in human years with a simple browser calculator.
Hat Size Calculator
Convert head circumference into an approximate hat size.
Luggage Linear Inches Calculator
Add luggage length, width, and height to check linear inches.
Ring Size Converter
Convert a US ring size into approximate EU and Japanese ring sizes.
Shoe Size International Converter
Estimate US, UK, and EU shoe sizes from foot length.
Automotive Tools (9)
Free automotive, mechanical, fuel, tire, and vehicle calculators.
Bolt Pattern Measurement Tool
Estimate wheel bolt pattern diameter from lug count and measurement.
Car Depreciation Estimator
Estimate vehicle value after annual depreciation.
Engine Compression Ratio Calculator
Calculate static compression ratio from swept and clearance volume.
Engine Displacement Calculator
Calculate engine displacement from bore, stroke, and cylinder count.
Gear Ratio Calculator
Calculate gear ratio and estimated speed from RPM, tire size, and final drive.
Horsepower to Weight Calculator
Calculate horsepower-to-weight ratio for cars, bikes, and performance comparisons.
Tire Size Comparison Calculator
Compare tire diameter, sidewall, circumference, and speedometer difference.
Towing Capacity Calculator
Estimate remaining towing margin from rating, trailer weight, cargo, and passengers.
Trip Fuel Cost Calculator
Estimate trip fuel cost from distance, fuel economy, and price per gallon.
E-Commerce Fee Calculators (10)
Free selling fee and profit calculators for online sellers and side hustles.
Amazon FBA Fee Calculator
Estimate Amazon-style referral, fulfillment, and profit numbers.
Depop Fee Calculator
Estimate Depop-style seller fees and payout.
eBay Fee Calculator
Estimate eBay-style selling fees and net proceeds.
Etsy Fee Profit Calculator
Estimate Etsy-style marketplace fees, profit, and margin.
Mercari Fee Calculator
Estimate seller payout after marketplace and payment fees.
PayPal Fee Calculator
Estimate PayPal-style transaction fees and net received.
Poshmark Fee Calculator
Estimate marketplace seller fees and profit.
Shopify Pricing Tier Calculator
Compare simplified monthly platform cost and processing impact.
Stripe Fee Calculator
Estimate payment processing fees and net received.
Vinted Fee Calculator
Estimate seller profit after adjustable marketplace costs.
AI & Prompt Tools (7)
Free AI prompt, token, vector, and context utilities that run in your browser.
AI Context Window Trimmer
Trim long text to an estimated token budget from the start, end, or both.
Cosine Similarity Calculator
Calculate cosine similarity between two numeric vectors.
LLM Token Counter
Estimate token count and character usage for prompts and AI text.
Prompt Template Builder
Build reusable prompt templates with role, task, context, and output format sections.
Stable Diffusion Resolution Calculator
Calculate image dimensions, megapixels, and aspect ratios for AI image workflows.
Subtitles SRT Time Shifter
Shift SRT subtitle timestamps forward or backward in your browser.
Vector Dimension Visualizer
Inspect vector length, magnitude, and normalized values for embedding experiments.