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 |
|---|---|---|---|
|
Ohm Symbol
|
Symbols & Unicode | Open | |
|
Ohm's Law Calculator
|
Science Tools | Open | |
|
Ohms to Amps Calculator
|
Engineering Tools | Open | |
|
Ohms to Horsepower Calculator
|
Engineering Tools | Open | |
|
Ohms to Joules Calculator
|
Engineering Tools | Open | |
|
Ohms to Kilowatt Hours Calculator
|
Engineering Tools | Open | |
|
Ohms to Kilowatts Calculator
|
Engineering Tools | Open | |
|
Ohms to kVA Calculator
|
Engineering Tools | Open | |
|
Ohms to Volts Calculator
|
Engineering Tools | Open | |
|
Ohms to Watts Calculator
|
Engineering Tools | Open | |
|
Oil Change Interval Tracker
|
Automotive Tools | Open | |
|
Oil Reserves Calculator
|
Engineering Tools | Open | |
|
Old English Font Generator
|
Text Tools | Open | |
|
Olive Oil Cups to Grams Converter
|
Food & Cooking | Open | |
|
Olive Oil Grams to Cups Converter
|
Food & Cooking | Open | |
|
Om Symbol
|
Symbols & Unicode | Open | |
|
Omega Symbol
|
Symbols & Unicode | Open | |
|
OMR to EUR Converter
|
Currency Converters | Open | |
|
OMR to USD Converter
|
Currency Converters | Open | |
|
One Half Symbol
|
Symbols & Unicode | Open | |
|
One Quarter Symbol
|
Symbols & Unicode | Open | |
|
One Rep Max Calculator (Brzycki)
|
Sports Tools | Open | |
|
One Rep Max Epley Calculator
|
Health & Fitness | Open | |
|
One Rep Max Percentage Table
|
Sports Tools | Open | |
|
One Sample T-Test Calculator
|
Math Calculators | Open | |
|
One Third Symbol
|
Symbols & Unicode | Open | |
|
One-Hot Encoding Helper
|
Computer Science Tools | Open | |
|
One-Time Pad Encrypt / Decrypt Tool
|
Security & Privacy | Open | |
|
One-Way ANOVA Calculator
|
Statistics Tools | Open | |
|
Online Metronome
|
Music Tools | Open | |
|
Op-Amp Gain Calculator
|
Engineering Tools | Open | |
|
Open Graph Tag Generator
|
SEO Tools | Open | |
|
Open Reading Frame (ORF) Finder
|
Biology Tools | Open | |
|
Operating Leverage Calculator
|
Accounting Tools | Open | |
|
Operating Margin Calculator
|
Economics Tools | Open | |
|
Opioid Conversion Calculator
|
Health & Fitness | Open | |
|
Opioid Morphine Equivalent Calculator
|
Health & Fitness | Open | |
|
Optical Power Budget Calculator
|
Physics Tools | Open | |
|
Option Breakeven Calculator
|
Finance Tools | Open | |
|
Option Delta Calculator (Black-Scholes)
|
Finance Tools | Open | |
|
Option Gamma Calculator
|
Finance Tools | Open | |
|
Option Intrinsic Value Calculator
|
Finance Tools | Open | |
|
Option Rho Calculator
|
Finance Tools | Open | |
|
Option Theta Calculator
|
Finance Tools | Open | |
|
Option Vega Calculator
|
Finance Tools | Open | |
|
Options Profit Calculator
|
Finance Tools | Open | |
|
Opus to AAC Converter
|
Audio Tools | Open | |
|
Opus to AIFF Converter
|
Audio Tools | Open |
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