Free online tools that just work
Fast, accurate and free. No sign-up, no clutter.
Smart Paste
Paste anything — a JWT, JSON, coordinates, a cron line, a hash, an equation — or drop a file. It is identified on the spot and the right tools open with it already filled in.
Everything stays in your browser: nothing you paste or drop is uploaded. Ctrl+Enter opens the best match.
Finance & Money
Loans, mortgages, savings, investing and everyday money math.
93 tools
Health & Everyday
BMI, calories, pace, sleep and other daily calculators.
27 tools
Sports & Fitness
Race predictions, training paces, scoring and match simulators.
48 tools
Conversion & Engineering
Unit conversion, electronics and mechanics.
32 tools
Images
Convert, resize, compress and analyze images in your browser.
34 tools
Time & Date
Time zones, date math, countdowns and calendars.
17 tools
Random & Generators
Passwords, dice, wheels, picks and other randomness.
13 tools
Games & Puzzles
Crosswords, word searches, sudoku, mazes and printable puzzles.
36 tools
Education & Learning
Grade calculators, memory simulators, study trainers and printable worksheets.
14 tools
Math Calculators
Algebra, calculus, geometry, matrices and number theory.
50 tools
Simulations & Math Toys
Epidemics, traffic, cellular automata, fractals and animated math.
183 tools
Arts & Crafts
Cross-stitch charts, papercraft box templates and printable graph paper.
6 tools
Planning & Organizing
Seating charts, gift exchanges, tournaments, schedules, matching and voting.
13 tools
Text & Writing
Word counts, diffs, case tools and text clean-up.
23 tools
Science
Chemistry, physics, biology and astronomy calculators.
51 tools
Machine Learning & AI
Neural nets, clustering, gradient descent and reinforcement learning — trained live in your browser.
52 tools
Data & Files
CSV, JSON, spreadsheets and file format tooling.
32 tools
Maps & Geo
Coordinates, great circles, sunlight maps and map rendering.
9 tools
Developer
Formatters, encoders, regex, hashes and dev utilities.
52 tools
Audio & Video
Convert, trim and inspect audio and video files.
21 tools
Statistics
Distributions, hypothesis tests, regression and probability.
59 tools
SEO & Web
Meta tags, SERP previews, redirects and page analysis.
8 tools
Gambling
Odds, expected value, house edge and bankroll math.
31 tools
Cryptography
Encryption, signatures, tokens and classic ciphers.
20 tools