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 |
|---|---|---|---|
|
Dental Restoration Material Mix Ratio Calculator
|
Health & Fitness | Open | |
|
Depreciation Calculator
|
Finance Tools | Open | |
|
Depth of Field Calculator
|
Photography Tools | Open | |
|
Depth of Field Calculator
|
Image Tools | Open | |
|
Depth Sounder Converter
|
Marine Tools | Open | |
|
Derangement Calculator
|
Math Calculators | Open | |
|
Derivative Calculator
|
Math Calculators | Open | |
|
Descent Rate Calculator
|
Aviation Tools | Open | |
|
Detention Time Calculator
|
Engineering Tools | Open | |
|
Determinant 3x3 Calculator
|
Math Calculators | Open | |
|
Determinant 4x4 Calculator
|
Math Calculators | Open | |
|
Device Pixel Ratio (DPR) Calculator
|
Developer Tools | Open | |
|
Dew Point Calculator
|
Weather Tools | Open | |
|
Dewormer Dose Calculator
|
Veterinary Tools | Open | |
|
DH Parameter Helper
|
Engineering Tools | Open | |
|
Dialysis Clearance Calculator
|
Health & Fitness | Open | |
|
Diameter Symbol
|
Symbols & Unicode | Open | |
|
Diamond Carat to MM Converter
|
Home & DIY | Open | |
|
Diamond Price Estimator
|
Jewelry Tools | Open | |
|
Diaper Count Estimator
|
Health & Fitness | Open | |
|
Dice Probability Calculator
|
Math Calculators | Open | |
|
Dice Probability Calculator
|
Gaming Tools | Open | |
|
Dice Roller
|
Gaming Tools | Open | |
|
Dice Set Roller
|
Gaming Tools | Open | |
|
Diesel Cycle Efficiency Calculator
|
Physics Tools | Open | |
|
Diff Checker
|
Developer Tools | Open | |
|
Differential Drive Kinematics Calculator
|
Engineering Tools | Open | |
|
Diffie-Hellman Key Exchange Explainer
|
Security & Privacy | Open | |
|
Diffraction Grating Calculator
|
Physics Tools | Open | |
|
Diffraction Grating Equation Calculator
|
Physics Tools | Open | |
|
Diffraction Limit Calculator for Photography
|
Photography Tools | Open | |
|
Dihybrid Ratio Calculator
|
Biology Tools | Open | |
|
Dilution Calculator
|
Science Tools | Open | |
|
Dilution Calculator (C1V1 = C2V2)
|
Chemistry Tools | Open | |
|
Dilution CFU Calculator
|
Biology Tools | Open | |
|
Dilution Factor Calculator
|
Science Tools | Open | |
|
Dilution for Injection Calculator
|
Health & Fitness | Open | |
|
Dilution Gravity Calculator
|
Food & Cooking | Open | |
|
Dilution Plating Calculator
|
Science Tools | Open | |
|
Dilution Series Calculator
|
Chemistry Tools | Open | |
|
Dimensional Weight Calculator
|
E-Commerce Tools | Open | |
|
Dingbat Symbols
|
Symbols & Unicode | Open | |
|
Dipole Antenna Calculator
|
Engineering Tools | Open | |
|
DIPSS Myelofibrosis Score
|
Health & Fitness | Open | |
|
Disability Insurance Calculator
|
Insurance Tools | Open | |
|
Discord Font Generator
|
Text Tools | Open | |
|
Discord PFP Resizer
|
Image Tools | Open | |
|
Discount Calculator
|
Finance Tools | Open |
Showing 2,017–2,064 of 8,445 tools