Random, IDs, mock data, calculators, references and browser debug — the kitchen sink.
Strong passwords with entropy meter.
Secure random numbers, ranges and picks.
Pick random items from any list.
Side-by-side file and text diff.
Generate placeholder images locally.
Verify file integrity against a hash.
Press any key to see its codes.
Generate fake names, emails, addresses and numbers.
Flip a virtual coin with heads/tails history.
Roll D4, D6, D8, D10, D12, D20, D100, or custom dice.
Ask a question and get a random yes or no.
Ask a question and shake the virtual 8-ball.
Spin a colorful wheel to pick from your options.
Randomly split a list of names into teams.
Generate printable 5×5 bingo cards with custom ranges.
Generate quick picks for Powerball, Mega Millions, EuroMillions, and more.
Spin an American or European roulette wheel.
Generate memorable, high-entropy diceware-style passphrases.
Generate K-Sortable Unique Identifiers (KSUIDs).
Generate and decode 12-byte Mongo ObjectIDs.
Generate collision-resistant CUID2 short IDs.
Generate numbered ID sequences with custom prefix and padding.
Generate random IDs from any alphabet, with collision estimates.
Generate URL-safe base62 short keys for link shorteners.
Compute MD5, SHA-1, SHA-256, and SHA-512 hashes for any file.
Check whether a plain text password matches a bcrypt hash.
Live password strength scoring with entropy and crack-time estimates.
Generate live RFC 6238 TOTP codes with a QR code for any authenticator app.
Generate counter-based RFC 4226 HOTP codes.
Generate cryptographic salts in hex, base64, base64url, or base32.
Generate hundreds of fake person names for testing.
Generate bulk fake email addresses with custom or built-in domains.
Generate fake phone numbers for US, UK, India, Germany, France, and Japan.
Generate fake US postal addresses with street, city, state, and ZIP.
Generate Luhn-valid test card numbers per brand for sandbox testing.
Generate fake IBANs with valid mod-97 checksums per country.
Generate plausible fake company and startup names.
Generate fake product rows with SKU, price, category, and description.
Generate complete fake user profiles as a downloadable JSON array.
Generate fake JSON instances from a simple schema definition.
Define columns and generate downloadable CSV rows with fake data.
Generate fake SQL INSERT statements for Standard, MySQL, or PostgreSQL.
Generate meaty bacon ipsum placeholder text with configurable length.
Toggle between pirate-speak and corporate-jargon placeholder text.
Drop in two text files and see a side-by-side line-by-line diff.
Compute union, intersection, and differences between two lists of strings.
Compare two directory snapshots from tree output and see what changed.
Generate a file of arbitrary size filled with zeros, random bytes, or text.
Split any file into smaller numbered parts by size or by chunk count.
Concatenate multiple files into a single combined file with drag reordering.
Drop in files to see name, MIME type, size, modified date, and image dimensions.
Inspect a .zip file's contents in tree or flat view and extract individual entries.
Calculate percentages in every common direction.
Compute the tip and split the total across your party.
Monthly EMI, total interest, and amortization schedule.
Project growth with compounding and recurring contributions.
Savings, final price, and stacked-discount math.
Add tax to a price or extract the pre-tax amount from a total.
Offline conversion between 22 major world currencies.
Format any number as currency in any locale via Intl.NumberFormat.
Body Mass Index with WHO category and color-coded result.
US Navy body fat percentage from tape measurements.
Convert between distance, time, and pace for any run.
Split a restaurant bill itemized per person with tax and tip.
Check whether a number is prime, with smallest factor if not.
Generate every prime up to N using the Sieve of Eratosthenes.
Compute n!, P(n,r) and C(n,r) with BigInt precision.
List the first N Fibonacci numbers with sum and golden-ratio convergence.
Greatest common divisor and least common multiple with Euclidean trace.
Add, subtract, multiply, divide, or mod arbitrarily large integers.
Convert decimals to best-fit fractions and fractions back to decimals.
Solve ax² + bx + c = 0 with discriminant, roots and vertex.
Mean, median, mode, variance, stddev, and percentiles for any dataset.
Bin numbers into a horizontal histogram with adjustable bin count.
Format numbers as scientific, engineering, accounting, Roman, and more.
Compute any percentile of a dataset with quartiles, IQR, and outlier detection.
Full ASCII table with decimal, hex, octal, binary and char.
Inspect any Unicode character: codepoint, UTF-8, UTF-16, block, escapes.
Search ~500 common emoji by name or keyword with skin-tone selector.
Searchable reference of common HTML named and numeric entities.
Curated palette of typographic, math, currency, arrow, and legal symbols.
ISO 3166-1 alpha-2, alpha-3, numeric and calling codes for every country.
ISO 4217 currency codes with symbol, decimal digits, and using countries.
ISO 639-1 and 639-2 language codes with native names and language family.
International dialing codes with two-way country-to-code lookup.
Yotta to yocto SI prefixes with a live unit converter.
Greek letters with romanization and common usage in math, physics, and CS.
Visual periodic table of all 118 elements, color-coded by category.
Searchable reference of essential Vim commands.
Searchable VS Code keyboard shortcuts with macOS / Windows toggle.
Searchable reference of common Git commands.
Searchable reference of Docker CLI and Compose commands.
Searchable reference of tmux sessions, windows, panes, and copy mode.
Reference table of POSIX signals with numbers, defaults, and uses.
Frequency-analysis aid for cracking monoalphabetic substitution ciphers.
Live display of window, document and screen size measurements.
Live readout of devicePixelRatio with CSS-to-device pixel conversion.
Test multitouch with live visualization of touch points and event log.
Live mouse coordinates relative to page, viewport, and tracking area with velocity.
Test pointer events with pressure, tilt, twist visualization for stylus debugging.
View, edit, add, and delete localStorage entries for this origin.
View, edit, add, and delete sessionStorage entries for this tab.
View, add, edit, and delete document-visible cookies.
Query and request browser permissions for geolocation, camera, notifications, and more.
Inspect WebGL and WebGL2 capabilities, limits, and supported extensions.
Live readout of connection effective type, downlink, RTT, and online status.
Read and write the system clipboard to test Clipboard API support.
Live readout of connected gamepads with axes and buttons visualization.
Request and exit fullscreen on a target element with live event logging.
Convert ASCII to fullwidth Ａｅｓｔｈｅｔｉｃ Unicode.
See bold, italic, fraktur, cursive, squared and more in one go.
Reverse character order or apply true mirror writing.
tUrN tExT iNtO mOcKiNg SpOnGeBoB cAsE.
Insert 👏 emoji 👏 between 👏 each 👏 word.
Generate creative usernames from word pools.
Generate startup and company name ideas by industry.
Build acronyms from phrases or find anagrams of words.
Auto-saving plain-text notepad in your browser.
Colored sticky notes that persist in your browser.
Quick answers to the questions developers ask most.
Switch context — 11 more toolsets ready to go.