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8,445 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 |
|---|---|---|---|
|
PERC Rule
|
Health & Fitness | Open | |
|
PERC Rule for PE (Simplified)
|
Health & Fitness | Open | |
|
PERC Rule for Pulmonary Embolism
|
Health & Fitness | Open | |
|
PERC Rule PE Calculator
|
Health & Fitness | Open | |
|
Perceived Stress Scale (PSS-10)
|
Health & Fitness | Open | |
|
Percent / URL Encoder
|
Developer Tools | Open | |
|
Percent Atom Economy
|
Chemistry Tools | Open | |
|
Percent Composition Calculator
|
Science Tools | Open | |
|
Percent Ionization Calculator
|
Chemistry Tools | Open | |
|
Percent of Total Calculator
|
Math Calculators | Open | |
|
Percent Symbol
|
Symbols & Unicode | Open | |
|
Percent Yield Calculator
|
Chemistry Tools | Open | |
|
Percent-Encode All Characters
|
Developer Tools | Open | |
|
Percentage Calculator
|
Number Tools | Open | |
|
Percentage Calculator
|
Math Calculators | Open | |
|
Percentage Change Calculator
|
Number Tools | Open | |
|
Percentage Decrease Calculator
|
Math Calculators | Open | |
|
Percentage Increase Calculator
|
Math Calculators | Open | |
|
Percentile Calculator
|
Math Calculators | Open | |
|
Percentile Rank Calculator
|
Education | Open | |
|
Percentile To Z Score
|
Education | Open | |
|
Perfect Number Checker
|
Math Calculators | Open | |
|
Perfume Concentration Guide
|
Beauty Tools | Open | |
|
Perimeter by Coordinates
|
Geography Tools | Open | |
|
Perimeter of a Circle Calculator
|
Math Calculators | Open | |
|
Perimeter of a Decagon Calculator
|
Math Calculators | Open | |
|
Perimeter of a Heptagon Calculator
|
Math Calculators | Open | |
|
Perimeter of a Hexagon Calculator
|
Math Calculators | Open | |
|
Perimeter of a Kite Calculator
|
Math Calculators | Open | |
|
Perimeter of a Nonagon Calculator
|
Math Calculators | Open | |
|
Perimeter of a Parallelogram Calculator
|
Math Calculators | Open | |
|
Perimeter of a Pentagon Calculator
|
Math Calculators | Open | |
|
Perimeter of a Rectangle Calculator
|
Math Calculators | Open | |
|
Perimeter of a Regular Polygon Calculator
|
Math Calculators | Open | |
|
Perimeter of a Rhombus Calculator
|
Math Calculators | Open | |
|
Perimeter of a Right Triangle Calculator
|
Number Tools | Open | |
|
Perimeter of a Sector Calculator
|
Math Calculators | Open | |
|
Perimeter of a Segment Calculator
|
Math Calculators | Open | |
|
Perimeter of a Semicircle Calculator
|
Math Calculators | Open | |
|
Perimeter of a Square Calculator
|
Number Tools | Open | |
|
Perimeter of a Trapezoid Calculator
|
Math Calculators | Open | |
|
Perimeter of a Triangle Calculator
|
Number Tools | Open | |
|
Perimeter of an Annulus Calculator
|
Math Calculators | Open | |
|
Perimeter of an Ellipse Calculator
|
Math Calculators | Open | |
|
Perimeter of an Equilateral Triangle Calculator
|
Number Tools | Open | |
|
Perimeter of an Octagon Calculator
|
Math Calculators | Open | |
|
Periodic Table Reference
|
Education | Open | |
|
Periodontal Risk Helper
|
Health & Fitness | Open |
Showing 5,473–5,520 of 8,445 tools