Miscellaneous Tools
Calculate percentages, solve rule of three problems and view formatted JSON. All processing happens in your browser and no installation is required.
Main Tools
Aspect Ratio Calculator
Calculate missing dimensions and maintain exact aspect ratios for images or screens.
Percentage Calculator
Calculate percentages, percentage increases, decreases, and percentage differences easily.
Simple Rule of Three Calculator
Solve direct and inverse simple rule of three math problems instantly.
Moon Phase Today
Check the current moon phase, illumination percentage, and upcoming lunar cycles.
For Developers
JSON Viewer
View, format, validate, and explore complex JSON data with a tree structure.
MD5 Hash Generator
Generate cryptographic MD5 hashes from any text input string.
Bcrypt Generator
Generate and verify secure Bcrypt password hashes online.
Moon Phases & Lunar CalendarFreetool.dev App
Track moon phases, check the lunar calendar, plan observations and photography, and never miss an eclipse. See precise moonrise and moonset times, track its position in real time, follow its trajectory in the sky, and access detailed astronomical data.- ✓Current Moon Phase
- ✓Lunar Calendar
- ✓Sky Finder
- ✓Sky Trail and Trajectory
- ✓Eclipses
- ✓Astronomical Data
Digital CounterFreetool.dev App
The ultimate tool to track your counts with advanced features and ease of use.- ✓Read total out loud
- ✓Count using volume buttons
- ✓Counts by shifts or periods
- ✓Counting goal
- ✓Visual and audio warnings on goal
- ✓Reports and more