All Free Tools
8,445 free online tools across 85 categories
Every tool here runs in your browser — no sign-up, no upload, nothing to install. Convert files, format code, generate text, run calculations, and check SEO across PDF, image, developer, finance, and unit-conversion tools. Pick one and start.
| Tool | Category | Description | Action |
|---|---|---|---|
|
Rate Limit Calculator
|
Dev Utilities | Open | |
|
Rate of Climb Calculator
|
Aviation Tools | Open | |
|
Rate of Reaction Calculator
|
Chemistry Tools | Open | |
|
Ratio Calculator
|
Number Tools | Open | |
|
Rayleigh Criterion Calculator
|
Physics Tools | Open | |
|
Rayleigh Range Calculator
|
Physics Tools | Open | |
|
RC Circuit Calculator
|
Physics Tools | Open | |
|
RC Filter Cutoff Frequency Calculator
|
DSP Tools | Open | |
|
RC Filter Cutoff Frequency Calculator
|
Electrical Tools | Open | |
|
RC Time Constant Calculator
|
Science Tools | Open | |
|
RCRI Score Calculator
|
Health & Fitness | Open | |
|
RDS Cost Estimator
|
Databases | Open | |
|
Reaction Order Calculator
|
Chemistry Tools | Open | |
|
Reaction Quotient Calculator
|
Chemistry Tools | Open | |
|
Reactive Power Compensation Calculator
|
Electrical Tools | Open | |
|
Reactor Conversion Calculator
|
Engineering Tools | Open | |
|
Reactor Criticality Helper
|
Engineering Tools | Open | |
|
Readability for SEO
|
SEO Tools | Open | |
|
Readability Grade Checker
|
Language Tools | Open | |
|
Readability Improver
|
Writing Tools | Open | |
|
Readability Score Checker
|
Text Tools | Open | |
|
Reading Level Accessibility Checker
|
Accessibility Tools | Open | |
|
Reading Level Analyzer
|
Text Tools | Open | |
|
Reading Level Grade
|
Education | Open | |
|
Reading List Tracker
|
Productivity | Open | |
|
Reading Speed by Language
|
Language Tools | Open | |
|
Reading Time Calculator
|
Language Tools | Open | |
|
Reading Time Calculator for Content
|
Writing Tools | Open | |
|
Reading Time Estimator
|
Productivity | Open | |
|
Real Estate Commission Split Calculator
|
Real Estate Tools | Open | |
|
Real vs Nominal Calculator
|
Finance Tools | Open | |
|
Realm Name Generator
|
Generators | Open | |
|
Reaumur to Celsius Converter
|
Unit Converters | Open | |
|
Reaumur to Fahrenheit Converter
|
Unit Converters | Open | |
|
Reaumur to Kelvin Converter
|
Unit Converters | Open | |
|
Reaumur to Rankine Converter
|
Unit Converters | Open | |
|
Rebar Calculator
|
Construction Tools | Open | |
|
Rebar Development Length Calculator
|
Engineering Tools | Open | |
|
Receipt Generator
|
PDF Tools | Open | |
|
Receivables Turnover Calculator
|
Economics Tools | Open | |
|
Recipe Nutrition Calculator
|
Food & Cooking | Open | |
|
Recipe Scaler & Converter
|
Food & Cooking | Open | |
|
Recoil Velocity Calculator
|
Physics Tools | Open | |
|
Recovery Factor Calculator
|
Engineering Tools | Open | |
|
Recursive Sequence Calculator
|
Math Calculators | Open | |
|
Redirect Generator
|
SEO Tools | Open | |
|
Redis Command Builder
|
Developer Tools | Open | |
|
Redox Half-Reaction Balancer
|
Chemistry Tools | Open |
Showing 6,097–6,144 of 8,445 tools