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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 |
|---|---|---|---|
|
Reticulocyte Production Index Calculator
|
Health & Fitness | Open | |
|
Retirement Calculator
|
Finance Tools | Open | |
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Retirement Date Calculator
|
Date & Time | Open | |
|
Retro / Vintage Color Palette Generator
|
Color Tools | Open | |
|
Retro Text Generator
|
Text Tools | Open | |
|
Retry Backoff Calculator
|
Dev Utilities | Open | |
|
Return On Assets Calculator
|
Economics Tools | Open | |
|
Return on Equity Calculator
|
Accounting Tools | Open | |
|
Revenue Churn Calculator
|
Finance Tools | Open | |
|
Reverb Time Calculator (RT60)
|
Music Tools | Open | |
|
Reverberation Time RT60 Calculator
|
Audio Tools | Open | |
|
Reverse Diet Calculator
|
Health & Fitness | Open | |
|
Reverse DNS Lookup
|
Networking Tools | Open | |
|
Reverse Each Word
|
Text Tools | Open | |
|
Reverse Line Order
|
Text Tools | Open | |
|
Reverse Text
|
Text Tools | Open | |
|
Reverse Text Generator
|
Text Tools | Open | |
|
Reverse Words
|
Text Tools | Open | |
|
Review Schema Generator
|
SEO Tools | Open | |
|
Revised Cardiac Risk Index
|
Health & Fitness | Open | |
|
Revised Geneva Score for PE
|
Health & Fitness | Open | |
|
Reynolds Number Airfoil Calculator
|
Aerospace Tools | Open | |
|
Reynolds Number Calculator
|
Science Tools | Open | |
|
Reynolds Number Fluid Calculator
|
Physics Tools | Open | |
|
Reynolds Risk Score Calculator
|
Health & Fitness | Open | |
|
RF Field Strength Calculator
|
Engineering Tools | Open | |
|
Rf Value Chromatography Calculator
|
Chemistry Tools | Open | |
|
RGB to CMYK Converter for Print
|
Color Tools | Open | |
|
RGB to HEX Converter with Live Swatch
|
Color Tools | Open | |
|
RGB to HSL Converter Online
|
Color Tools | Open | |
|
RGB to HSV Converter
|
Color Tools | Open | |
|
RGB to HWB Converter
|
Color Tools | Open | |
|
RGB to LAB Color Converter
|
Color Tools | Open | |
|
RGB to RGBA Converter
|
Color Tools | Open | |
|
RGB to XYZ Converter
|
Color Tools | Open | |
|
RGBA to CMYK Converter
|
Color Tools | Open | |
|
RGBA to HEX Converter
|
Color Tools | Open | |
|
RGBA to HSL Converter
|
Color Tools | Open | |
|
RGBA to HSV Converter
|
Color Tools | Open | |
|
RGBA to HWB Converter
|
Color Tools | Open | |
|
RGBA to LAB Converter
|
Color Tools | Open | |
|
RGBA to RGB Converter
|
Color Tools | Open | |
|
RGBA to XYZ Converter
|
Color Tools | Open | |
|
Rhenium Electron Configuration
|
Chemistry Tools | Open | |
|
Rhenium Oxidation States
|
Chemistry Tools | Open | |
|
Rhodium Electron Configuration
|
Chemistry Tools | Open | |
|
Rhodium Element Properties
|
Chemistry Tools | Open | |
|
Rhodium Oxidation States
|
Chemistry Tools | Open |
Showing 6,241–6,288 of 8,451 tools