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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 |
|---|---|---|---|
|
Quoted-Printable Decoder
|
Developer Tools | Open | |
|
Quoted-Printable Encoder
|
Developer Tools | Open | |
|
R Value To U Value
|
Physics Tools | Open | |
|
R-Squared Calculator
|
Math Calculators | Open | |
|
R0 Reproduction Number Calculator
|
Health & Fitness | Open | |
|
Rabbit Name Generator
|
Generators | Open | |
|
Race Fuel Consumption Calculator
|
Sports Tools | Open | |
|
Race Fuel Load Calculator
|
Sports Tools | Open | |
|
Race Pace Predictor (Riegel Formula)
|
Fitness Tools | Open | |
|
Race Time Converter
|
Sports Tools | Open | |
|
Race Time Predictor
|
Sports Tools | Open | |
|
Rad to Becquerels Converter
|
Unit Converters | Open | |
|
Rad to Curies Converter
|
Unit Converters | Open | |
|
Rad to Grays Converter
|
Unit Converters | Open | |
|
Rad to Rem Converter
|
Unit Converters | Open | |
|
Rad to Sieverts Converter
|
Unit Converters | Open | |
|
Radar Range Calculator
|
Engineering Tools | Open | |
|
Radians to Arcminutes Converter
|
Unit Converters | Open | |
|
Radians to Arcseconds Converter
|
Unit Converters | Open | |
|
Radians to Degrees Converter
|
Unit Converters | Open | |
|
Radians to Gradians Converter
|
Unit Converters | Open | |
|
Radians to Turns Converter
|
Unit Converters | Open | |
|
Radiation Distance Dose Calculator
|
Physics Tools | Open | |
|
Radiation Dose Rate Calculator
|
Health & Fitness | Open | |
|
Radiation Shielding Thickness Calculator
|
Engineering Tools | Open | |
|
Radiator Sizing Calculator
|
HVAC Tools | Open | |
|
Radioactive Activity Calculator
|
Physics Tools | Open | |
|
Radioactive Contamination Decay Calculator
|
Engineering Tools | Open | |
|
Radioactive Decay Calculator
|
Science Tools | Open | |
|
Radioactive Decay Calculator
|
Engineering Tools | Open | |
|
Radiometric Dating Calculator
|
Science Tools | Open | |
|
Radium Electron Configuration
|
Chemistry Tools | Open | |
|
Radium Element Properties
|
Chemistry Tools | Open | |
|
Radium Oxidation States
|
Chemistry Tools | Open | |
|
Radon Electron Configuration
|
Chemistry Tools | Open | |
|
Radon Oxidation States
|
Chemistry Tools | Open | |
|
Raffle Win Probability Calculator
|
Math Calculators | Open | |
|
Rafter Length Calculator
|
Construction Tools | Open | |
|
RAID Capacity Calculator
|
Computer Science Tools | Open | |
|
Rainfall Accumulation Calculator
|
Weather Tools | Open | |
|
Rainwater Barrel Calculator
|
Gardening Tools | Open | |
|
Rainwater Harvesting Calculator
|
Agriculture Tools | Open | |
|
Raise Percentage Calculator
|
HR & Payroll | Open | |
|
Raised Bed Plant Count Calculator
|
Gardening Tools | Open | |
|
Raised Bed Soil Calculator
|
Agriculture Tools | Open | |
|
Raisins Cups to Grams
|
Food & Cooking | Open | |
|
Raisins Grams to Cups
|
Food & Cooking | Open | |
|
Ramadan Date Calculator
|
Reference Tools | Open |
Showing 6,001–6,048 of 8,451 tools