All Free Tools
8,451 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 |
|---|---|---|---|
|
Renal Stone Risk Calculator
|
Health & Fitness | Open | |
|
Render Time Estimator
|
Video Tools | Open | |
|
Renewal Rate Calculator
|
Finance Tools | Open | |
|
Renovate Config Generator
|
Developer Tools | Open | |
|
Rent Increase Calculator
|
Real Estate Tools | Open | |
|
Rent Receipt Generator
|
PDF Tools | Open | |
|
Rent Split by Room Calculator
|
Finance Tools | Open | |
|
Rent vs Buy Real Estate Calculator
|
Real Estate Tools | Open | |
|
Rent vs. Buy Calculator
|
Finance Tools | Open | |
|
Rental Yield Calculator
|
Real Estate Tools | Open | |
|
Reorder Point Calculator
|
E-Commerce Tools | Open | |
|
Rep Max Percentage Table
|
Health & Fitness | Open | |
|
Repeating Gradient Generator
|
Color Tools | Open | |
|
Replacement Cost Calculator
|
Insurance Tools | Open | |
|
Request Count Budget Calculator
|
Dev Utilities | Open | |
|
Requests Per Second Capacity
|
Dev Utilities | Open | |
|
Reserved vs On-Demand Cloud Cost Comparison
|
Computer Science Tools | Open | |
|
Reservoir Pressure Calculator
|
Engineering Tools | Open | |
|
Residence Time Calculator
|
Engineering Tools | Open | |
|
Resin Mixing Calculator
|
Home & DIY | Open | |
|
Resin Volume Calculator
|
Electrical Tools | Open | |
|
Resistance of Wire Calculator
|
Physics Tools | Open | |
|
Resistance Parallel Calculator
|
Science Tools | Open | |
|
Resistance Series Calculator
|
Science Tools | Open | |
|
Resistivity Calculator
|
Physics Tools | Open | |
|
Resistor Color Code Calculator
|
Engineering Tools | Open | |
|
Resistor E-Series Lookup
|
Electrical Tools | Open | |
|
Resistors in Parallel Calculator
|
Physics Tools | Open | |
|
Resistors In Series
|
Physics Tools | Open | |
|
Resolution Chromatography Calculator
|
Chemistry Tools | Open | |
|
Resolution Scaling Calculator
|
Electrical Tools | Open | |
|
Resonance Frequency System
|
Physics Tools | Open | |
|
Resonant Frequency of a Tube
|
Acoustics Tools | Open | |
|
Resource Utilization Calculator
|
Productivity | Open | |
|
Respiratory Dead Space Calculator
|
Health & Fitness | Open | |
|
Respiratory System Compliance Calculator
|
Health & Fitness | Open | |
|
Responsive Breakpoint Helper
|
Design Tools | Open | |
|
Rest Interval Timer
|
Fitness Tools | Open | |
|
Restaurant Name Generator
|
Generators | Open | |
|
Restaurant Tax & Tip Calculator
|
Finance Tools | Open | |
|
Restriction Enzyme Finder
|
Biology Tools | Open | |
|
Resume Builder
|
PDF Tools | Open | |
|
Retail Price Calculator
|
E-Commerce Tools | Open | |
|
Retained Earnings Calculator
|
Accounting Tools | Open | |
|
Retaining Wall Calculator
|
Construction Tools | Open | |
|
Retaining Wall Stability Calculator
|
Engineering Tools | Open | |
|
Retention Factor Calculator (Rf)
|
Chemistry Tools | Open | |
|
Reticulocyte Production Index (RPI) Calculator
|
Health & Fitness | Open |
Showing 6,193–6,240 of 8,451 tools