Every tool you need. Nothing you don't.
A growing library of fast, focused web utilities — free to use, no account required, and built to stay out of your way.
Start typing to search…
At a glance
1100+
Tools available
100%
Free to use
0
Sign-ups needed
Instant results
Most tools run in your browser for speed and privacy.
Private by default
Your inputs stay on your device — we don't store them.
Fresh additions
Recently Added
The latest tools added to our collection
Molar Mass Calculator
Calculate the molar mass (molecular weight) of any chemical formula with elemental composition breakdown.
Modular Multiplicative Inverse Calculator
Calculate the modular multiplicative inverse of an integer modulo m using the Extended Euclidean Algorithm with step-by-step solutions.
Mixed Number to Fraction Converter
Convert any mixed number to an improper fraction or proper fraction with clear, step-by-step math explanations.
Miter Angle Calculator
Calculate the precise miter and bevel angles for simple frames or compound crown molding joints using your saw.
Minimum Spanning Tree Calculator
Find the Minimum Spanning Tree (MST) of any weighted graph using Kruskal's or Prim's algorithm. Visualize the steps, sorted edges, and total tree weight.
Midrange Calculator
Calculate the midrange (arithmetic mean of maximum and minimum values) of any dataset. Get step-by-step formula breakdowns, min/max details, and sorted data analysis.
Meters to Feet Converter
Convert meters to feet and inches instantly with our free online converter. Supports custom decimal precision, visual comparisons, and real-world reference metrics.
Mercury Sign Calculator
Find your Mercury zodiac sign instantly based on your birth date, time, and timezone. Learn about your communication style, intellectual drive, and decision-making approach.
Mercury Retrograde Calendar
Check if Mercury is retrograde now. View complete Mercury retrograde dates, shadow periods, and zodiac signs for any year (1900-2100) with Swiss Ephemeris accuracy.
Menstrual Cycle Length Calculator
Calculate your menstrual cycle length, predict your next period, estimate fertile window and ovulation day based on your last two period start dates.
Benchmark Builder
Compare multiple performance test suites with mean, variance, and ratio analysis. Generate markdown tables and bullet list reports for your benchmarks.
Bcrypt Generator
Generate bcrypt password hashes with configurable salt rounds and verify hashes against plain text. Free online bcrypt hash generator and checker.
Basic Auth Generator
Generate HTTP Basic Authentication headers from username and password for API testing and web development. Free online Basic Auth header generator.
Base64 File Converter
Convert any file to Base64 encoded string and decode Base64 strings back to downloadable files with preview support. Free online Base64 file encoder and decoder.
Meeting Cost Ticker
Track the real-time cost of your meeting as it ticks up like a taximeter. Enter attendees and hourly rate to see the cumulative cost grow second by second.
Mean Median Mode Calculator
Calculate mean, median, mode, and range with step-by-step formulas and interactive visualizations for any dataset.
Median Calculator
Calculate the median of any dataset with step-by-step explanations, quartiles, sorted data view, and a box plot visualization.
Median Absolute Deviation Calculator
Calculate the Median Absolute Deviation (MAD) of any dataset with step-by-step formulas, scale factor options, outlier detection, and comparison to standard deviation.
Mean Calculator
Calculate the arithmetic mean (average) of any dataset with step-by-step formula breakdown and comprehensive statistics including sum, median, range, and standard deviation.
Maze Generator
Generate random, solvable mazes with custom dimensions, start/end points, and colors. Download as PNG, SVG, or animated GIF solution.
Max Heart Rate Calculator
Calculate your maximum heart rate using 6 scientifically-validated formulas including Tanaka, Gulati, and traditional methods. Free online maximum heart rate estimator with training zone breakdown.
Matrix Trace Calculator
Calculate the trace of any square matrix online. Free matrix trace calculator with step-by-step computation, eigenvalue verification, and property detection.
Matrix Rank Calculator
Calculate the rank of any matrix using row reduction with detailed step-by-step computation and matrix properties.
Matrix Power Calculator
Calculate the power of any square matrix raised to any integer exponent with step-by-step visualization and intermediate matrices.
Explore the library
Browse by Category
38 categories — pick one to explore its tools
ASCII Tools
26 tools
Audio & Video Tools
23 tools
Color Tools
42 tools
Construction & Real Estate
27 tools
Data Conversion
85 tools
Developer Tools
197 tools
Education Tools
7 tools
Electrical & Electronics
17 tools
Encoding & Encryption
77 tools
Engineering Fluid Mechanics
53 tools
Finance Calculators
212 tools
Food Cooking
18 tools
Fractal Generators
45 tools
Gaming Tools
26 tools
Health & Fitness
52 tools
Image Manipulation
120 tools
List Tools
42 tools
Math Calculators
362 tools
Miscellaneous tools
159 tools
Name Generators
9 tools
Network Tools
20 tools
Paycheck Calculators
51 tools
PDF & Document Tools
2 tools
Physics & Chemistry
75 tools
QR & Barcode Tools
4 tools
Random Generators
64 tools
Real Estate Finance
27 tools
Social Media Tools
20 tools
Statistics & Data Analysis
37 tools
Text Editors & Viewers
6 tools
Text Processing
81 tools
Time & Date
103 tools
Travel & Automotive
16 tools
Unicode Tools
43 tools
Unit Converters
48 tools
Utilities
28 tools
Weather & Environment
7 tools
Web & SEO Tools
18 tools
No categories match your search.
On the roadmap
Coming Soon
New mini-tools we're building next.
Html to Jsx
Convert HTML file to JSX online
Instagram Reel Downloader
Download and save Instagram videos locally with our Instagram Reel Downloader. No signup required.
Instagram Reel Thumbnail Downloader
Save thumbnails from any reel
Always free
No subscriptions, credits, or paywalls. Every tool on the site is free to use.
Privacy first
Processing happens client-side whenever possible. Your data never leaves your browser.
Organized by category
Browse by topic or search instantly. Find the right utility in seconds.
Support
Frequently Asked Questions
Straight answers about how Online Mini Tools works.
Are the tools on this website free to use?
Do I need to create an account to use the tools?
Can I suggest new tools or features?
Are the results generated by these tools accurate?
Are my inputs and results private and secure?
Are these tools compatible with mobile devices?
Have an idea?
Didn't find the tool you need?
We're always expanding the collection. Tell us what would make your workflow easier and we'll consider it for the roadmap.
Browser Extension
Get the Online Mini Tools Browser Extensions
Search and launch any tool from your browser toolbar — available for Chrome and Firefox. Access 1100+ tools without leaving your current tab.
Google and the Chrome Web Store badge are trademarks of Google LLC. Firefox and the Firefox Add-ons logo are trademarks of the Mozilla Foundation.