All online tools (2226)
Browse every tool by category, or filter with a keyword.
Developer Tools
JSON, code formatting, regex testing and developer helpers
Encryption & Hashing
MD5, Base64, AES, URL encoding and hash digests
Text Utilities
Counting, replacing, dedupe, case and symbol handling
Unit Converters
Length, area, weight, temperature and data storage
Date & Time
Timestamps, date intervals, countdowns and calendars
Image Tools
Compress, convert, resize and pick colors from images
Color & Design
Palettes, gradients, color conversion and CSS generators
Everyday Life
Health, finance, documents and everyday lookups
Webmaster & SEO
Encoding checks, robots, TDK and site diagnostics
QR & Barcode
QR generation, styling, barcodes and scenario encoders
Media & Documents
Media info, audio trimming, image to PDF, recording
PDF Tools
Merge, split, extract, delete, rotate, watermark, number, encrypt PDFs
Study & Reference
Chemistry, math drills, reference tables and quick facts
Math & Geometry
Equations, fractions, logs, trigonometry, geometry, matrices and sequences
Physics & Chemistry
Velocity, force, energy, Ohm law, gas laws, molarity and equation balancing
Finance & Money
Loans, compound interest, ROI, retirement savings, inflation and real returns
Statistics
Distributions, hypothesis tests, confidence intervals, regression and sample size
Health & Medical
BMR/TDEE, body fat, target heart rate, drug dosing and clinical scores
Divination & Folklore
BaZi, Zi Wei, Qi Men, feng shui, astrology, tarot, numerology, runes and coffee reading โ entertainment only
Engineering
Concrete, paint, wire sizing, voltage drop, beam loads and pipe flow