Convert Files. Crunch Numbers. All Free.
Free online calculators, business tools, AI economy analyzers, and file converters. Everything runs in your browser — no uploads, no accounts.
Categories
Pick a category to find the tool you need.
Tax Calculators
Income tax, self-employment tax, sales tax, and more for every US state.
23 toolsPayroll Calculators
Paycheck estimators, employer cost calculators, and overtime tools.
22 toolsPricing Calculators
Markup, margin, hourly rate, and project pricing tools.
13 toolsBusiness Planning
Break-even analysis, startup cost estimators, and ROI calculators.
19 toolsFreelancer Tools
Rate calculators, invoice generators, and time tracking tools for freelancers.
9 toolsE-Commerce Calculators
FBA fees, shipping cost, profit margin, and dropshipping calculators.
10 toolsReal Estate Calculators
Mortgage, rental yield, property tax, and closing cost calculators.
9 toolsAI Economy Tools
AI cost calculators, ROI tools, and job impact analyzers.
20 toolsAI Agency Tools
Pricing, profitability, and client ROI tools for AI agencies.
20 toolsFile Converters
Convert documents, images, audio, video, and data files in your browser.
234 toolsReference & Conversion
Unit converters, currency tools, and quick reference utilities.
17 toolsDeveloper Tools
Color converters, encoders, generators, and utilities for developers.
30 toolsInvestment Calculators
Compound interest, ROI, retirement savings, and investment growth tools.
4 toolsTopic Hubs
Curated multi-step tool paths for complete workflows.
Tax and Payroll Optimization Hub
Paycheck, withholding, tax planning, and reimbursement workflows for recurring money operations.
Business and AI Economics Hub
Cost, ROI, and automation decision workflows for AI adoption and growth planning.
Conversion and Data Pipelines Hub
High-demand document, media, and data conversion flows for repeat utility usage.
Freelancer Unit Economics Hub
Pricing, margin, tax, and workload tools for independent operators.
Tool Collections
Deep toolsets built around high-demand workflows.
Payroll & Tax
Paychecks, bonus withholding, overtime, and employer cost planning tools.
AI Economics
ROI tools for automation decisions, chatbot rollouts, and cost benchmarking.
E-Commerce Margins
Marketplace-specific tools for Amazon, Etsy, eBay, and Shopify profit visibility.
Unit Economics
CAC, LTV, ROI, and SaaS metrics tools for pricing strategy and growth.
Developer Utilities
Conversion and debugging tools for JSON, regex, URLs, and timestamps.
Popular Tools
The most-used tools across payroll, AI, e-commerce, and conversions.
Paycheck Calculator
Estimate take-home pay after federal taxes, state taxes, and payroll deductions for hourly or salary income.
Use tool →Self-Employment Tax Calculator
Calculate your self-employment tax (Social Security + Medicare) based on your net earnings. Supports all 50 US states.
Use tool →AI vs Human Cost Calculator
Compare the cost of completing a task with AI tools versus hiring a human. Includes API costs, time savings, and ROI.
Use tool →AI Model Comparison Table
Compare top AI model providers in one up-to-date table covering flagship models, API access, context, and links to official docs.
Use tool →AI Automation Savings Calculator
Estimate time and cost savings from automating recurring business tasks with AI and workflow tools.
Use tool →Home Office Deduction Calculator
Estimate your home office deduction using simplified and actual expense methods for side businesses and self-employment.
Use tool →Customer Acquisition Cost Calculator
Calculate CAC from sales and marketing spend and estimate payback period using customer gross profit.
Use tool →Shopify Profit Calculator
Estimate Shopify order profit after product costs, payment fees, shipping, apps, and marketing spend.
Use tool →Image Format Converter
Convert images between JPG, PNG, and WebP formats. Resize, adjust quality, batch convert — all in your browser.
Use tool →JSON to CSV / CSV to JSON Converter
Convert between JSON and CSV formats instantly. Supports custom delimiters, nested objects, and file upload.
Use tool →Customer Lifetime Value Calculator
Estimate customer lifetime value using monthly revenue, gross margin, and churn. Includes LTV:CAC ratio.
Use tool →Creator & Culture Tools
Short-form hooks, meme ideation, slang translation, and content quality tools.
Short-Form Video Hook Generator
Generate high-retention hooks and script beats for TikTok, Reels, and YouTube Shorts.
Use tool →Viral Hashtag Generator
Create platform-specific hashtag bundles tuned to trend intent, niche relevance, and discovery.
Use tool →Meme Idea Generator
Generate meme-ready concept packs by format and vibe for fast posting across major social platforms.
Use tool →Gen Alpha Slang Translator
Translate trending internet slang to plain English and convert plain phrasing into social-native language.
Use tool →AI Slop Risk Checker
Score content drafts for generic AI-style signals and get practical recommendations to increase authenticity.
Use tool →AI Model Comparison Table
Compare top AI model providers in one up-to-date table covering flagship models, API access, context, and links to official docs.
Use tool →Newest Tools
Recently published tools.
Anagram Solver
Find words and exact anagrams from a set of letters.. Free online, browser-based tool with instant results and no signup.
Use tool →Wordle Solver
Filter and rank likely Wordle guesses from pattern, included letters, and excluded letters.
Use tool →MusicXML to PDF Converter
Render MusicXML note data into a printable PDF score preview.. Free online, browser-based tool with instant results and no signup.
Use tool →ABC to PDF Converter
Render ABC notation into a printable PDF note sheet.. Free online, browser-based tool with instant results and no signup.
Use tool →ABC Notation to MIDI Converter
Convert ABC notation text into playable MIDI files.. Free online, browser-based tool with instant results and no signup.
Use tool →MIDI to MusicXML Converter
Convert MIDI note sequences into MusicXML notation output.. Free online, browser-based tool with instant results and no signup.
Use tool →MusicXML to MIDI Converter
Convert MusicXML score notation into standard MIDI files.. Free online, browser-based tool with instant results and no signup.
Use tool →MIDI to MP3/WAV Converter
Synthesize MIDI note events to WAV or MP3 audio directly in the browser.. Free online, browser-based tool with instant results and no signup.
Use tool →100%
Free with no hidden fees or paywalls
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Guides, Widgets & Benchmarks
Go deeper with long-form guides, embeddable widgets, and benchmark datasets.
How It Works
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