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 |
|---|---|---|---|
|
Harmonic Mean Calculator
|
Math Calculators | Open | |
|
Harmonic Series Calculator
|
Math Calculators | Open | |
|
Harris Hip Score Calculator
|
Health & Fitness | Open | |
|
Harris-Benedict BMR Calculator
|
Health & Fitness | Open | |
|
Harvest Yield Estimator
|
Gardening Tools | Open | |
|
Harvey-Bradshaw Index
|
Health & Fitness | Open | |
|
HAS-BLED Bleeding Risk Score
|
Health & Fitness | Open | |
|
HAS-BLED Score Calculator
|
Health & Fitness | Open | |
|
Hash Collision Probability
|
Computer Science Tools | Open | |
|
Hash Comparison Tool
|
Developer Tools | Open | |
|
Hash Iterations Calculator
|
Crypto Tools | Open | |
|
Hash Rate Converter
|
Crypto Tools | Open | |
|
Hashtag Generator
|
Productivity | Open | |
|
Hashtag Generator
|
Social Media Tools | Open | |
|
Hashtag Symbol
|
Symbols & Unicode | Open | |
|
Haul Cycle Time Calculator
|
Engineering Tools | Open | |
|
Haversine Distance Calculator
|
Space & Astronomy | Open | |
|
Hay Bale Calculator
|
Agriculture Tools | Open | |
|
Hazen-Williams Calculator
|
Physics Tools | Open | |
|
HbA1c to eAG Converter
|
Health & Fitness | Open | |
|
Head Loss Calculator
|
Physics Tools | Open | |
|
Headcount Cost Calculator
|
HR & Payroll | Open | |
|
Heading Correction Calculator
|
Aviation Tools | Open | |
|
Heading Structure Helper
|
Accessibility Tools | Open | |
|
Headline Analyzer
|
Text Tools | Open | |
|
Headroom Calculator
|
Audio Tools | Open | |
|
Headwind & Tailwind Calculator
|
Aviation Tools | Open | |
|
Health Insurance Subsidy Calculator
|
Insurance Tools | Open | |
|
Heart Emoji List
|
Symbols & Unicode | Open | |
|
Heart Pathway Score (HEART Score)
|
Health & Fitness | Open | |
|
Heart Rate From ECG
|
Biology Tools | Open | |
|
Heart Rate Reserve Calculator
|
Fitness Tools | Open | |
|
Heart Rate Zone Calculator
|
Health & Fitness | Open | |
|
HEART Score Calculator
|
Health & Fitness | Open | |
|
HEART Score for ED Chest Pain
|
Health & Fitness | Open | |
|
Heart Symbols
|
Symbols & Unicode | Open | |
|
Heat Capacity Ratio Calculator
|
Chemistry Tools | Open | |
|
Heat Duty Calculator
|
Engineering Tools | Open | |
|
Heat Energy Calculator
|
Physics Tools | Open | |
|
Heat Engine Efficiency Calculator
|
Science Tools | Open | |
|
Heat Exchanger Calculator
|
Engineering Tools | Open | |
|
Heat Index (NOAA)
|
Science Tools | Open | |
|
Heat Index Calculator
|
Weather Tools | Open | |
|
Heat of Combustion Calculator
|
Chemistry Tools | Open | |
|
Heat of Fusion Calculator
|
Physics Tools | Open | |
|
Heat Of Reaction Calculator
|
Chemistry Tools | Open | |
|
Heat of Vaporization Calculator
|
Physics Tools | Open | |
|
Heat Pump COP Calculator
|
Physics Tools | Open |
Showing 3,217–3,264 of 8,451 tools