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Free online tools that actually do the job.
Calculators, converters, formatters, and how-to guides — all in your browser, all free forever. From loan and mortgage math to JSON formatters, QR codes, and Pomodoro timers, Free Tool Arena puts every tool you keep Googling on a single page each. No account, no email, no upsell.
Why not just ask ChatGPT? Because ChatGPT can’t print a properly aligned Avery 5160 label sheet from your CSV in 4 seconds, can’t guarantee your loan numbers cite the IRS, can’t run when your wifi drops mid-calculation. We can. Every formula published with primary sources.
Most used this week
All tools →- Money & FinanceLoan Calculator
- Money & FinanceMortgage Calculator
- Money & FinanceCompound Interest Calculator
- Money & FinanceMonthly Budget Calculator
- Money & FinanceTip Calculator
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- Money & FinanceScientific Calculator
- Developer UtilitiesJSON Formatter
- Developer UtilitiesRegex Tester
- Developer UtilitiesQR Code Generator
- Developer UtilitiesPassword Generator
- Developer UtilitiesBase64 Encoder & Decoder
- ProductivityPomodoro Timer
- ProductivityCountdown Timer
- File & Format ConvertersImage Resizer
- File & Format ConvertersImage Compressor
- Health & FitnessBMI Calculator
- GamesSnake Game
- Games2048 Game
- GamesTic Tac Toe
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Popular tools
All tools →Tool · Money & Finance
Tip Calculator
Determine the perfect tip and split the bill among any number of people. This free online calculator works on mobile with instant results and no ads.
Tool · Money & Finance
Loan Calculator
Work out monthly payments and total interest on any loan. Enter amount, rate, and term — get a clear breakdown in seconds.
Tool · Money & Finance
Mortgage Calculator
Calculate your real monthly mortgage cost. Get a full PITI breakdown covering principal, interest, taxes, and insurance for FHA, VA, and conventional loans online.
Tool · Money & Finance
Compound Interest Calculator
Calculate how your money grows with compound interest. Add starting balance and monthly contributions to watch the curve — free online tool in seconds.
Tool · Money & Finance
Car Loan Calculator
Free car loan calculator. Enter the vehicle price, down payment, APR, and term to see your monthly payment and total interest before signing.
Tool · Money & Finance
Auto Loan Calculator
Estimate your auto loan payment, total interest, and payoff timeline in seconds. Free, mobile-friendly, no signup.
Popular guides
All guides →Guide · Money & Finance
How to Save Money Fast
Generate 15 real tactics to save money fast by automating cuts and raising income. Instant checklist, free and no sign-up required.
Guide · Money & Finance
The Best Side Hustles for Beginners
Filter honest side hustle ideas by immediate payout and long-term potential instantly. Identify real opportunities and skip the scams free online.
Guide · Money & Finance
How to Start Investing With $100
Start investing with just $100: pick a broker, buy a low‑cost index fund, and automate your contributions. Free online guide with no sign‑up required.
Guide · Money & Finance
How to Make a Monthly Budget
Build a budget in 20 minutes using zero-based rules. Create your monthly budget online for free instantly with no registration, tailored to your life.
Guide · Money & Finance
How to Pay Off Debt Fast
Compare snowball and avalanche debt payoff methods with real math—which saves dollars, which builds momentum. A free instant calculator, no sign-up needed online.
Guide · Money & Finance
How to Build Credit From Zero
Transform your credit score with a secured card and on-time payments. Learn what mistakes to avoid in this free, no sign-up guide for beginners.
Browse by category
Money & Finance
Budget, loan, interest, and paycheck math — in seconds.
109 tools · 83 guides
Productivity
Timers, planners, and routines for focused work.
34 tools · 23 guides
File & Format Converters
PDFs, images, data formats — converted in your browser, offline-safe.
79 tools · 27 guides
Developer Utilities
Formatters, generators, and regex tools for daily dev work.
155 tools · 83 guides
Coding & Tech
Learn to code, ship your first project, land the dev job.
20 guides
Career & Growth
Interviews, résumés, promotions, and smart career moves.
60 tools · 52 guides
Health & Fitness
Quick calculators and plain-English habit guides.
43 tools · 66 guides
Writing & Content
Write better, start a blog, grow an audience online.
30 tools · 30 guides
Home & Life
A calmer, cleaner, better-run home life — one habit at a time.
58 tools · 21 guides
AI & Prompt Tools
Prompt builders, token counters, and prompt libraries for ChatGPT, Claude, Gemini, and image models.
53 tools · 119 guides
Audio, Video & Voice
Record, trim, convert, and transcribe audio + video — all in your browser.
23 tools · 25 guides
Games
Quick browser games for breaks — snake, 2048, tic-tac-toe, memory, hangman, word puzzles.
20 tools
Gaming
Sensitivity converters, DPS calculators, bracket generators, and the math for Minecraft, D&D, and MTG.
23 tools · 12 guides
Automotive
Car loans, fuel economy, depreciation, insurance, tires, and the full cost of owning a vehicle.
16 tools · 3 guides
Cooking & Food
Recipe scaling, baking conversions, coffee ratios, food storage times — the kitchen math that doesn't change.
13 tools
Parenting & Baby
Pregnancy, baby feeding, sleep schedules, growth percentiles, and the daily calculators parents actually need.
13 tools
Pets
Dog and cat age conversions, food amounts, vaccine timing, travel and boarding costs — practical pet math.
11 tools · 1 guide
Relationships & Social
Friendships, hard conversations, and social skills that travel.
2 tools · 8 guides
Text & Writing Utilities
Count, format, clean, and convert text in a tab.
58 tools · 13 guides
Unit Converters
Length, speed, temperature, and more — no ads, no math.
31 tools · 13 guides
Random & Fun
Coin flips, dice, and decision makers when you just need an answer.
16 tools · 1 guide
Runs in your browser
Inputs never leave your device. No accounts, no tracking scripts, no cookie wall.
Written to be useful
Short, specific guides — the kind a friend would send you, not a 2,000-word intro.
Fast on any device
Static pages and tiny bundles. Works the same on a slow phone as a desktop.
Last reviewed end-to-end October 2026. See exactly how our tools work →