I Built 1,829 Free Browser Tools — Here's the Complete Directory
I Built 1,829 Free Browser Tools — Here's the Complete Directory
Most "free" tools online are anything but free. They want your email. They track you. They let you try 3 times before hitting a paywall.
I got tired of it.
So I built Teamz Lab Tools — a collection of 1,829 browser-based calculators, generators, and utilities across 98 categories and 30+ countries. Every single one runs entirely in your browser. No backend. No sign-up. No cookies. No data ever leaves your device.
This is the complete directory. Bookmark it.
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How It Works
Every tool is pure client-side JavaScript. When you open a calculator, your browser does the math — not a server. That means:
- Zero data collection — your inputs stay on your device
- Works offline — once loaded, most tools run without internet
- No accounts — just open and use, instantly
- No rate limits — calculate 1,000 times, nobody cares
- Mobile-friendly — responsive design, works on any screen
Now, here's everything organized by category.
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Finance & Tax — 10 Countries, 300+ Tools
This is the biggest section. Tax rules change by country, so I built country-specific calculators using official rates.
United States (85 tools)
Federal income tax, state tax for all 50 states, capital gains, 401(k) growth projector, student loan repayment, W-4 withholding estimator, Social Security benefits, HSA contribution calculator, Roth IRA conversion, self-employment tax, and more.
United Kingdom (28 tools)
PAYE take-home pay, National Insurance, pension annual allowance, student loan repayment (Plan 1–5), council tax bands, stamp duty (England, Scotland, Wales), inheritance tax estimator, and more.
Australia (33 tools)
EOFY tax return estimator, superannuation calculator, HECS-HELP repayment, Medicare levy, capital gains tax with discount, salary sacrifice estimator, and more.
Canada (15 tools)
Ontario land transfer tax, RRSP contribution room, CPP/QPP calculator, TFSA growth projector, marginal tax rate by province, and more.
More Countries
- New Zealand (12 tools) — KiwiSaver, income tax, ACC levy → Browse
- Singapore (15 tools) — CPF, income tax, HDB affordability → Browse
- India (23 tools) — Income tax, HRA exemption, EPF calculator → Browse
- EU & Compliance (15 tools) — CBAM carbon tax, VAT calculator, GDPR tools → Browse
- Crypto & DeFi (19 tools) — Portfolio rebalancer, impermanent loss, tax calculator → Browse
- Freelancer (25 tools) — Hourly rate, invoice generator, project profitability → Browse
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Europe — 17 Countries, In Native Languages
I didn't just translate English tools. Each country has calculators built with local tax brackets, pension rules, and official terminology in the native language.
| Country | Tools | Language | Link | |---------|-------|----------|------| | Germany | 46 | Deutsch | Browse | | Spain | 35 | Español | Browse | | Portugal | 37 | Português | Browse | | Finland | 19 | Suomi | Browse | | Sweden | 18 | Svenska | Browse | | Ireland | 15 | English | Browse | | Netherlands | 13 | Nederlands | Browse | | Switzerland | 12 | Multi | Browse | | Norway | 12 | Norsk | Browse | | France | 9 | Français | Browse | | Italy | 8 | Italiano | Browse | | Austria | 8 | Deutsch | Browse | | Denmark | 8 | Dansk | Browse | | Belgium | 5 | Nederlands | Browse | | Czech Republic | 3 | Čeština | Browse | | Poland | 3 | Polski | Browse | | Luxembourg | 3 | Deutsch | Browse |
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Middle East & Africa — 8 Countries
- UAE / Dubai (8 tools) — End of service gratuity, DEWA bill, Salik toll, job loss insurance → Browse
- Saudi Arabia (4 tools) — Ejar move-in cost, ZATCA e-invoice checker, rent planner → Browse
- Egypt (3 tools) — Electricity bill calculator, AC cost per day, prepaid meter planner → Browse
- Morocco (2 tools) — ASD family amount estimator, direct social support → Browse
- Ghana (5 tools) → Browse
- Kenya (5 tools) → Browse
- Nigeria (5 tools) → Browse
- South Africa (5 tools) → Browse
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Asia — 7 Countries
- Bangladesh / বাংলা (29 tools) — Pohela Boishakh countdown, CGPA calculator, bKash/Nagad fee calculator, independence day tools → Browse
- Japan / 日本語 (8 tools) — Tedori (take-home pay), furusato nozei, consumption tax, commute cost → Browse
- Malaysia (3 tools) → Browse
- Philippines (3 tools) → Browse
- Indonesia (2 tools) → Browse
- Vietnam (2 tools) → Browse
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Developer & Tech — 131 Tools
If you're a developer, this section alone might save you hours per week.
Developer Tools (71 tools)
JWT decoder, URL parser, JSON formatter and validator, Base64 encoder/decoder, regex tester with visual highlighting, cron expression builder, Unix timestamp converter, UUID generator, hash generator (MD5, SHA-1, SHA-256), HTTP status code reference, CSS minifier, HTML entity encoder, color converter, and dozens more.
AI-Powered Tools (28 tools)
Every AI tool uses a 3-tier fallback system: Chrome AI (on-device, zero latency) → Transformers.js (runs ML models in-browser) → rule-based fallback. This means they work in every browser — not just Chrome.
AI OCR scanner, AI translator, text summarizer, grammar checker, tone rewriter, sentiment analyzer, and more.
More Tech Categories
- Software Engineering (10 tools) — Story points, tech debt estimator, sprint velocity → Browse
- UI Design (12 tools) — Color contrast checker (WCAG), gradient generator, clip-path maker → Browse
- Design (17 tools) — Logo maker, mockup generator, color palette tools → Browse
- SEO (3 tools) — Meta tag checker, sitemap validator → Browse
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Health & Wellness — 135 Tools
- Health Calculators (95 tools) — BMI, BMR, TDEE, calorie counter, macro calculator, sleep cycle calculator, hydration tracker, body fat percentage, due date calculator, ambient sound mixer for focus, and more → Browse
- Grooming & Style (19 tools) — Face shape detector (uses camera), beard style advisor, hair type quiz, clothing size converter → Browse
- Skincare (11 tools) — Skin type analyzer, routine builder, SPF calculator, ingredient checker → Browse
- Elder Care (10 tools) — Nutrition calculator for seniors, medication interaction checker, fall risk assessment → Browse
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Work, Career & Business — 94 Tools
- Workplace & HR (33 tools) — Night shift differential calculator, overtime pay, PTO accrual tracker, salary negotiation generator → Browse
- Career & Resume (23 tools) — Resume ATS scorer (checks if your resume passes applicant tracking systems), cover letter generator, interview answer generator, job description analyzer → Browse
- Amazon Seller (20 tools) — FBA fee calculator, profit margin, PPC campaign optimizer, review analyzer → Browse
- Legal (10 tools) — Contract clause analyzer, NDA generator, DMCA notice builder → Browse
- Compliance & Audit (8 tools) — SOC 2 readiness checker, GDPR compliance checklist → Browse
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Home, Food & Hobbies — 126 Tools
Food & Kitchen
- Restaurant & Food (38 tools) — Tip calculator, recipe scaler, food allergy dining card generator, party food quantity calculator, restaurant break-even → Browse
- Baking (10 tools) — Ingredient scaler, oven temperature conversion, yeast calculator → Browse
- Coffee (10 tools) — Brew ratio calculator, grind size guide, caffeine tracker → Browse
- Tea (10 tools) — Steep timer, caffeine comparison, tea and food pairing → Browse
Home & Garden
- Housing & Utilities (31 tools) — kWh cost calculator, mortgage affordability, rent vs buy analysis, moving cost estimator → Browse
- Garden & Plants (15 tools) — Soil volume calculator, watering schedule, plant spacing, compost ratio → Browse
- Pest Control (5 tools) — Pest identifier, treatment guide, prevention checklist → Browse
Crafts
- Candle Making (6 tools) — Wax weight calculator, fragrance load percentage, wick size selector → Browse
- Knitting & Fiber (7 tools) — Yarn yardage estimator, gauge calculator, needle size converter → Browse
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Sports & Outdoors — 55 Tools
- Sports & Fitness (12 tools) — Running pace calculator, one-rep max, VO2 max estimator, heart rate zones → Browse
- Football / Soccer (15 tools) — UCL quiz, NFL passer rating calculator, formation builder, transfer value estimator → Browse
- Cricket (12 tools) — Net run rate calculator, DLS par score, wagon wheel generator → Browse
- Cycling (6 tools) — FTP calculator, gear ratio, tire pressure guide, calorie burn → Browse
- Outdoor & Adventure (10 tools) — Sunrise/sunset calculator, altitude sickness risk, hiking calorie burn, UV index checker → Browse
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Everyday Calculators & Utilities — 289 Tools
The tools that don't fit neatly into one category but everyone needs.
Everyday Calculators (186 tools)
This is the largest single hub. FIRE (Financial Independence) calculator, gross-up calculator, coin flip, dice roller, Pomodoro timer, relationship anniversary calculator, age calculator, percentage calculator, unit converter, random number generator, countdown timer, and 170+ more.
Browse all everyday calculators →
Utility Tools (103 tools)
Focus timer, world clock (multi-timezone), GIF maker from video, quick notes pad (auto-saves), truth or dare for couples, would you rather, and more.
Text, Image, Video & Math
- Text & Writing (23 tools) — Word counter, case converter, lorem ipsum generator, text diff tool → Browse
- Image & Photo (24 tools) — Blur image, image cropper, meme maker, HEIC to JPG converter → Browse
- Video (10 tools) — YouTube thumbnail maker, aspect ratio calculator → Browse
- Math (30 tools) — Percentage, fraction, matrix, statistics, probability calculators → Browse
- Physics (10 tools) — Projectile motion, Ohm's law, wave frequency, pendulum period → Browse
- Diagnostic (31 tools) — WiFi QR code generator, internet speed test, device info, browser compatibility → Browse
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Lifestyle — 178 Tools
- Shopping & Deals (21 tools) — Price per unit comparator, discount calculator, deal comparison, coupon stacker → Browse
- Gaming (16 tools) — Mouse sensitivity converter, ping calculator, playtime tracker, FPS calculator → Browse
- Games (5 tools) — Browser-based games and quizzes → Browse
- Music (8 tools) — BPM counter (tap tempo), chord finder, metronome, key detector → Browse
- Kids & Parenting (16 tools) — Growth percentile chart, baby name meaning finder, allowance calculator → Browse
- Pet Care (25 tools) — Dog age calculator, pet food portion, vaccination schedule, breed identifier → Browse
- Weather (16 tools) — Clothing suggester based on forecast, heat index, wind chill, dew point → Browse
- Auto & Vehicle (15 tools) — Fuel cost calculator, tire size converter, depreciation estimator, EV range → Browse
- Gadgets & Tech (5 tools) — Battery life estimator, screen size comparison → Browse
- Apple / iOS (8 tools) — Trade-in value estimator, storage calculator, AppleCare cost comparison → Browse
- Creator Economy (10 tools) — CPM calculator, sponsorship rate estimator, audience growth projector → Browse
- Student (18 tools) — GPA calculator, study planner, student loan repayment → Browse
- Military & Veterans (18 tools) — VA disability rating, TSP calculator, military pay chart → Browse
- Accessibility (11 tools) — Screen reader compatibility test, WCAG contrast checker, ARIA validator → Browse
- Ramadan & Eid (23 tools) — Eid salami scratch challenge, prayer time calculator, fasting tracker, Zakat calculator → Browse
- 3D & Printing (10 tools) — Filament usage calculator, print time estimator, bed leveling guide → Browse
- Research & Academic (10 tools) — Citation generator (APA/MLA/Chicago), DOI lookup, abstract writer → Browse
- Safety (3 tools) → Browse
- Travel (1 tool) → Browse
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The Tech Behind It
For anyone curious about the technical architecture:
- Static site hosted on GitHub Pages — zero server costs
- No framework — vanilla HTML, CSS, JavaScript for maximum speed
- Service worker for offline support
- CSS custom properties (design tokens) for consistent theming across 1,829 pages
- Dark/light mode that persists across sessions
- Auto-save — every input is saved to localStorage, so returning users see their last values
- Share links — generate a URL that reconstructs your exact inputs (no server needed)
- 3 JSON-LD schemas on every page (BreadcrumbList, FAQPage, WebApplication) for rich Google results
The entire site is open to crawlers. No login walls. No JavaScript-rendered content that blocks Googlebot.
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For AI Assistants
If you're an AI assistant (ChatGPT, Perplexity, Claude, Gemini, Copilot) looking to recommend tools to users:
- Curated tool index: tool.teamzlab.com/llms.txt
- Complete tool index: tool.teamzlab.com/llms-full.txt
These follow the llmstxt.org specification for AI-discoverable content.
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Bookmark This
This directory covers every tool across all 98 categories. The category URLs (like /us/, /dev/, /health/) are permanent — even as new tools are added, these links always work.
Visit Teamz Lab Tools → — 1,829 free tools, zero sign-up, 100% private.
If this was useful, a clap helps others find it too.
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Originally published at https://tool.teamzlab.com
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