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 |
|---|---|---|---|
|
Number Base Converter
|
Number Tools | Open | |
|
Number Extractor
|
Text Tools | Open | |
|
Number Line Generator
|
Education | Open | |
|
Number Needed to Treat
|
Statistics Tools | Open | |
|
Number of Atoms Calculator
|
Chemistry Tools | Open | |
|
Number to Words Converter
|
Language Tools | Open | |
|
Numerical Aperture Calculator
|
Physics Tools | Open | |
|
Numerical Derivative Calculator
|
Math Calculators | Open | |
|
Numerical Line Sorter
|
Text Tools | Open | |
|
Numerology Name Number Calculator
|
Culture & Trivia | Open | |
|
NYHA Heart Failure Classification Reference
|
Health & Fitness | Open | |
|
Nyquist Frequency Calculator
|
Engineering Tools | Open | |
|
Nyquist Sampling Rate Calculator
|
Computer Science Tools | Open | |
|
Nyquist Stability Helper
|
Engineering Tools | Open | |
|
NZD to EUR Converter
|
Currency Converters | Open | |
|
NZD to GBP Converter
|
Currency Converters | Open | |
|
NZD to USD Converter
|
Currency Converters | Open | |
|
Oats Cups to Grams Converter
|
Food & Cooking | Open | |
|
Oats Grams to Cups Converter
|
Food & Cooking | Open | |
|
Observability Helper
|
Engineering Tools | Open | |
|
Occupant Load Calculator
|
Engineering Tools | Open | |
|
Octal ASCII Code Decoder
|
Text Tools | Open | |
|
Octal to Base32 Converter
|
Math Calculators | Open | |
|
Octal to Base36 Converter
|
Math Calculators | Open | |
|
Octal to Base64 Converter
|
Math Calculators | Open | |
|
Octal to Binary Converter
|
Number Tools | Open | |
|
Octal to Decimal Converter
|
Number Tools | Open | |
|
Octal to Hexadecimal Converter
|
Number Tools | Open | |
|
Octane Blend Calculator
|
Engine & Combustion Tools | Open | |
|
Octave Band Calculator
|
Acoustics Tools | Open | |
|
October Birth Flower
|
Reference Tools | Open | |
|
October Birthstone
|
Reference Tools | Open | |
|
OD600 to Cell Density Calculator
|
Science Tools | Open | |
|
Odds Ratio Calculator
|
Statistics Tools | Open | |
|
Odds to Probability Converter
|
Math Calculators | Open | |
|
OEE Calculator
|
Engineering Tools | Open | |
|
Off-Grid Load Sizing Calculator
|
Energy Tools | Open | |
|
Office Emoji List
|
Symbols & Unicode | Open | |
|
OG Image Resizer
|
Image Tools | Open | |
|
OGG to AAC Converter
|
Audio Tools | Open | |
|
OGG to AIFF Converter
|
Audio Tools | Open | |
|
OGG to FLAC Converter
|
Audio Tools | Open | |
|
OGG to M4A Audio Converter
|
Audio Tools | Open | |
|
OGG to MP3 Converter
|
Audio Tools | Open | |
|
OGG to Opus Converter
|
Audio Tools | Open | |
|
OGG to WAV Converter
|
Audio Tools | Open | |
|
OGG to WMA Converter
|
Audio Tools | Open | |
|
Ohm Symbol
|
Symbols & Unicode | Open |
Showing 5,137–5,184 of 8,445 tools