About NexTool

Online tools with free and paid access for developers, creators, and everyday calculations.

What is NexTool?

NexTool offers online calculators, converters, and developer tools. From mortgage and BMI calculators to JSON formatters and QR code generators, plus AI-assisted features and saved account data. We cover finance, health, fitness, developer utilities, text processing, and more.

Fast & Free

Start with free tools for common tasks. Paid plans provide higher usage limits and additional features.

Privacy First

Local calculations run in the browser. AI requests, accounts and saved reports use server services. See the privacy policy for details.

40+ Calculators

Financial, health, and math calculators covering mortgages, taxes, BMI, retirement, investments, and more.

Browser Access

Use NexTool in a modern web browser on desktop, tablet or mobile. Availability depends on the service and your connection.

Our Tools

NexTool offers tools across eight categories:

Calculators — Mortgage, BMI, salary, tax, retirement, investment, compound interest, and 30+ more
Converters — Unit converter, currency converter, cooking converter, and 60+ unit conversion pages
Text Tools — Word counter, case converter, markdown preview, text statistics
Developer Tools — JSON formatter, Base64, regex tester, JWT decoder, SQL formatter
Generators — QR codes, UUIDs, color palettes, invoices, passwords
Utilities — Typing speed test, countdown timer, screen resolution checker, time zone converter
Security — Hash generator, password generator with entropy analysis
AI Tools — Content writer, code generator, SEO analyzer, image describer

Content & Resources

60+ Conversion Pages

Dedicated pages for common conversions: kg to lbs, cm to inches, Celsius to Fahrenheit, and more.

Browse Conversions

Educational Blog

In-depth guides on mortgages, compound interest, BMI, debt payoff strategies, and more.

Read Articles

Pricing

All calculator and converter tools are completely free with generous daily limits. For power users and AI-powered tools, we offer affordable Pro and Business plans starting at $9/month.

Explore tools

Need deeper analysis? Try AI-powered document review

Analyze tax docs, contracts & statements with Pro — $9/mo

Learn more

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