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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 |
|---|---|---|---|
|
FFT Frequency Resolution Calculator
|
DSP Tools | Open | |
|
FIB-4 Fibrosis Index Calculator
|
Health & Fitness | Open | |
|
FIB-4 Index Calculator
|
Health & Fitness | Open | |
|
FIB-4 Index Calculator
|
Health & Fitness | Open | |
|
Fiber NA Calculator
|
Physics Tools | Open | |
|
Fiber Optic Bandwidth Calculator
|
Physics Tools | Open | |
|
Fiber Optic Dispersion Calculator
|
Physics Tools | Open | |
|
Fibonacci Calculator
|
Math Calculators | Open | |
|
Fibonacci Sequence Generator
|
Number Tools | Open | |
|
FICA Tax Calculator
|
Finance Tools | Open | |
|
Field of View Calculator for Photography
|
Photography Tools | Open | |
|
FIFO Inventory Calculator
|
Finance Tools | Open | |
|
Filament Cost Calculator
|
Electrical Tools | Open | |
|
File Checksum Verifier
|
Developer Tools | Open | |
|
Filler Word Finder
|
Writing Tools | Open | |
|
Film Reciprocity Failure Calculator
|
Photography Tools | Open | |
|
Filter Lines Containing
|
Text Tools | Open | |
|
Filter Order Calculator
|
DSP Tools | Open | |
|
Final Exam Grade Calculator
|
Education | Open | |
|
Final Gravity Calculator
|
Food & Cooking | Open | |
|
Final Velocity Calculator
|
Science Tools | Open | |
|
Financial Leverage Calculator
|
Accounting Tools | Open | |
|
Find And Replace Text
|
Text Tools | Open | |
|
Fire Flow Calculator
|
Construction Tools | Open | |
|
Fire Flow Required Calculator
|
Engineering Tools | Open | |
|
FIRE Number Calculator
|
Finance Tools | Open | |
|
Fire Resistance Rating
|
Engineering Tools | Open | |
|
Firewood BTU Reference Chart
|
Woodworking | Open | |
|
Firewood Cord Calculator
|
Agriculture Tools | Open | |
|
First Law of Thermodynamics Calculator
|
Physics Tools | Open | |
|
First Letter Capitalizer
|
Text Tools | Open | |
|
First Pass Yield (FPY) Calculator
|
Engineering Tools | Open | |
|
First-Order ODE Solver
|
Science Tools | Open | |
|
Fiscal Year Calculator
|
Finance Tools | Open | |
|
Fish Name Generator
|
Generators | Open | |
|
Fish Tank Stocking Calculator
|
Pet Tools | Open | |
|
Fish Weight from Length Calculator
|
Sports Tools | Open | |
|
Fisher Exact Test
|
Statistics Tools | Open | |
|
Fisher Grade Calculator
|
Health & Fitness | Open | |
|
Fishing Line Strength Calculator
|
Sports Tools | Open | |
|
Fishing Sinker Weight Selector
|
Sports Tools | Open | |
|
Fitzpatrick Skin Type Classifier
|
Health & Fitness | Open | |
|
Five Number Summary Calculator
|
Math Calculators | Open | |
|
Fixed Point Iteration
|
Math Calculators | Open | |
|
Fixture Unit Calculator
|
Engineering Tools | Open | |
|
FLAC to AAC Converter
|
Audio Tools | Open | |
|
FLAC to AIFF Converter
|
Audio Tools | Open | |
|
FLAC to M4A Converter
|
Audio Tools | Open |
Showing 2,593–2,640 of 8,445 tools