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 |
|---|---|---|---|
|
Redirect Generator
|
SEO Tools | Open | |
|
Redis Command Builder
|
Developer Tools | Open | |
|
Redox Half-Reaction Balancer
|
Chemistry Tools | Open | |
|
Redshift Calculator
|
Space & Astronomy | Open | |
|
Redshift to Distance Calculator
|
Astrophysics Tools | Open | |
|
Reel Line Capacity Calculator
|
Sports Tools | Open | |
|
Refinance Savings Calculator
|
Real Estate Tools | Open | |
|
Reflection Calculator
|
Math Calculators | Open | |
|
Reflux Ratio Calculator
|
Engineering Tools | Open | |
|
Refractive Index Calculator
|
Science Tools | Open | |
|
Refresh Rate Frame Time Calculator
|
Electrical Tools | Open | |
|
Refrigerant Charge Calculator
|
HVAC Tools | Open | |
|
Refrigerator COP Calculator
|
Physics Tools | Open | |
|
Regex Builder
|
Developer Tools | Open | |
|
Regex Cheatsheet
|
Developer Tools | Open | |
|
Regex Explainer
|
Developer Tools | Open | |
|
Regex Flags Tester
|
Developer Tools | Open | |
|
Regex Live Replace
|
Developer Tools | Open | |
|
Regex Split Tool
|
Developer Tools | Open | |
|
Regex Tester
|
Developer Tools | Open | |
|
Regex Validator
|
Developer Tools | Open | |
|
Registered Trademark Symbol
|
Symbols & Unicode | Open | |
|
Relative Density of Soil Calculator
|
Engineering Tools | Open | |
|
Relative Humidity Calculator
|
Weather Tools | Open | |
|
Relative Risk Calculator
|
Statistics Tools | Open | |
|
Relativistic Doppler Calculator
|
Physics Tools | Open | |
|
Relativistic Energy Particle Calculator
|
Astrophysics Tools | Open | |
|
Relativistic Kinetic Energy Calculator
|
Physics Tools | Open | |
|
Relativistic Momentum Calculator
|
Physics Tools | Open | |
|
Relocation Budget Calculator
|
Home & DIY | Open | |
|
Rem to Becquerels Converter
|
Unit Converters | Open | |
|
Rem to Curies Converter
|
Unit Converters | Open | |
|
rem to em Converter
|
Unit Converters | Open | |
|
Rem to Grays Converter
|
Unit Converters | Open | |
|
rem to Picas Converter
|
Unit Converters | Open | |
|
rem to Pixels Converter
|
Unit Converters | Open | |
|
rem to Points Converter
|
Unit Converters | Open | |
|
Rem To Px Converter
|
Developer Tools | Open | |
|
Rem to Rad Converter
|
Unit Converters | Open | |
|
Rem to Sieverts Converter
|
Unit Converters | Open | |
|
Remove Duplicate Lines
|
Text Tools | Open | |
|
Remove Duplicate Lines
|
Text Tools | Open | |
|
Remove Duplicate Words
|
Text Tools | Open | |
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Remove Empty Lines
|
Text Tools | Open | |
|
Remove Extra Spaces
|
Text Tools | Open | |
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Remove Line Breaks
|
Text Tools | Open | |
|
Remove Line Numbers
|
Text Tools | Open | |
|
Renal Dose Adjustment Guide
|
Health & Fitness | Open |
Showing 6,145–6,192 of 8,451 tools