All Free Tools
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 |
|---|---|---|---|
|
Sparkle Symbol
|
Symbols & Unicode | Open | |
|
Speaker SPL Calculator
|
Audio Tools | Open | |
|
Speaking Time Calculator
|
Language Tools | Open | |
|
Speaking Time Script
|
Writing Tools | Open | |
|
Spearman Rank Correlation Calculator
|
Statistics Tools | Open | |
|
Special Character Remover
|
Text Tools | Open | |
|
Specific Fuel Consumption Calculator
|
Aerospace Tools | Open | |
|
Specific Gravity (Pharmacy) Calculator
|
Health & Fitness | Open | |
|
Specific Gravity Calculator
|
Science Tools | Open | |
|
Specific Gravity Solution Calculator
|
Chemistry Tools | Open | |
|
Specific Heat Calculator
|
Science Tools | Open | |
|
Specific Heat Capacity Calculator
|
Physics Tools | Open | |
|
Specific Impulse Calculator
|
Physics Tools | Open | |
|
Specific Orbital Energy Calculator
|
Astrophysics Tools | Open | |
|
Specific Stiffness Calculator
|
Science Tools | Open | |
|
Specific Weight Calculator
|
Physics Tools | Open | |
|
Spectrophotometric Cell Count Calculator
|
Health & Fitness | Open | |
|
Spectrophotometry Calculator
|
Biology Tools | Open | |
|
Speed By Country Converter
|
Travel Tools | Open | |
|
Speed From Skid Marks
|
Automotive Tools | Open | |
|
Speedometer Error Calculator
|
Automotive Tools | Open | |
|
Speedrun Timer
|
Gaming Tools | Open | |
|
Spell Name Generator
|
Generators | Open | |
|
Spelling Test Generator
|
Education | Open | |
|
Spetzler-Martin AVM Grade
|
Health & Fitness | Open | |
|
SPF Reapplication Timer
|
Beauty Tools | Open | |
|
SPF Record Generator
|
Networking Tools | Open | |
|
Sphere Equation Calculator
|
Math Calculators | Open | |
|
Sphere of Influence Calculator
|
Astrophysics Tools | Open | |
|
Spherical Equivalent Calculator
|
Health & Fitness | Open | |
|
Spherical Mirror Calculator
|
Physics Tools | Open | |
|
Spinal Cord ASIA Impairment Scale
|
Health & Fitness | Open | |
|
Spine Text Fit Calculator
|
Printing Tools | Open | |
|
Spiral Stair Calculator
|
Woodworking | Open | |
|
Split Complementary Color Finder Online
|
Color Tools | Open | |
|
SpO2/FiO2 Ratio Calculator
|
Health & Fitness | Open | |
|
SpO2/FiO2 Ratio Calculator
|
Health & Fitness | Open | |
|
Sports Emoji List
|
Symbols & Unicode | Open | |
|
Spot Savings Calculator
|
Computer Science Tools | Open | |
|
Spotify Playlist Cover Resizer
|
Image Tools | Open | |
|
Spread to Treasury Calculator
|
Finance Tools | Open | |
|
Spring Constant Calculator
|
Science Tools | Open | |
|
Spring Design Calculator
|
Engineering Tools | Open | |
|
Spring Frequency Calculator
|
Physics Tools | Open | |
|
Spring Potential Energy Calculator
|
Physics Tools | Open | |
|
Spring Rate Calculator
|
Construction Tools | Open | |
|
Sprinkler Density Calculator
|
Engineering Tools | Open | |
|
Sprint Speed Calculator
|
Sports Tools | Open |
Showing 6,769–6,816 of 8,445 tools