Alphabet Sequence Generator
Enter the start letter and the end letter, e.g. a-z, aa-zz, and output all the letters
Permutation Generator
Generate all permutations of a set of digits, with optional deduplication and a custom separator
Number Sequence Generator
Generate Numbers in Sequential Order within a Specified Range
Random Integer Generator
Generate a batch of random integers within a range, with a custom count and output separator
Random IPv6 Address Generator
Used to generate IPv6 addresses in bulk and receive the specified quantity
Table of Contents Generator
Enter the title and content to automatically generate a catalogue, clicking on the catalogue will position it to the title.
SKU Generator
Bulk SKU Generator, a cool development tool, I'm glad to introduce you to this generator!
Random Float Generator
Floating Point Generator, a cool development tool, I'm glad to introduce you to this generator!
UUID Generator
Generate UUID v4 identifiers in bulk right in your browser, with optional hyphen formatting
Random MAC Address Generator
MAC Address Generator, a cool development tool, I'm glad to introduce you to this generator!
Random String Generator
String Generator, a cool development tool, I'm glad to introduce you to this generator!
Random IPv4 Address Generator
Used to generate IPv4 addresses in bulk and receive the specified quantity
Random Boolean Generator
Boolean Generator, a cool development tool, I'm glad to introduce you to this generator!
IP to Integer Converter
Convert IPv4 addresses to decimal integers and back, with batch conversion for multiple lines at once
URL Encoder and Decoder
Encoding and decoding of URLs. Support batch operation, you can convert multiple URLs at a time
Text to Binary Converter
This tool converts text from various languages, including Chinese, English, Japanese, Korean, etc., into binary data, representing the text as sequences of 0s and 1s
Word Scrambler
English Word Smasher, A cool word tool, is happy to introduce you to this generator!
Remove Duplicate Lines
The text de-duplication tool is a cool tool that will automatically analyse and extract duplicates from the text to eliminate them and keep the text unique, the text de-duplication tool is a simple and easy to use tool that will help the user to process the text easily!
Line Shuffler
Text Smasher, A cool text tool, is happy to introduce you to this generator!Text Shuffle is an online tool for randomizing the order of texts
Text Repeater
Text Duplicator, a cool development tool, is happy to introduce you to this duplicator!
Number Grouping Tool
Extract numbers from text and split them into groups based on the specified number per group.
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Odd and Even Number Sorter
Split any list of numbers into odd and even groups, with optional dedupe, ascending or descending order and negative number support
Combination Calculator
Calculate unordered number combinations online, supporting custom number of elements and selection quantity
Number Extractor
Automatically identify and extract all numbers from any text, including integers, decimals and negative numbers
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Serial Number Generator
Generate sequential serial numbers from a start value and step, with optional prefix, suffix and zero padding
Number Range Filter
Accurately extract all numbers that meet the criteria based on the set value range
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Missing Number Finder
Find the numbers missing from a sequence: compare against a range step by step, list every gap or merge them into continuous ranges
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Shuffle Number Groups
Reshuffle multi-line number groups in bulk — sort or randomize inside each line and reorder the lines themselves, with optional dedupe
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SQL IN Clause Generator
Wrap every number with a prefix and a suffix, then join them with a separator to build ready-to-paste strings
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Function Grapher
Plot functions online and export SVG - explicit, polar, parametric and implicit F(x,y)=0, with adjustable domain, sample count and grid
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Remove Commas from Numbers
Strip thousands separators, spaces and dashes from numbers in one click (1,234,567 becomes 1234567), with options to keep the decimal point and minus sign
Number Shuffler
One-click to randomly shuffle the order of existing number sequences and generate new random permutations
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Sum Calculator
Add up each line of numbers in bulk and get a grand total for all groups, with support for decimals and negative numbers
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Random Number Picker
Randomly pick a given amount of numbers from your list, with multiple groups, optional dedupe and ascending or descending output
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Place Value Number Generator
Build random numbers place by place — choose the allowed digits for the units, tens, hundreds and beyond, then generate in bulk with dedupe and sorting
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Number Property Checker
Batch-check mathematical properties — prime, square, Fibonacci, happy — plus parity and digit count, with a filter to list only one kind
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Number Visualizer
Turn numbers into horizontal bars, columns or a stacked share bar to compare magnitudes at a glance, with linear or log scale plus shares and ranks
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Curved Text Generator
Lay numbers out along a circular arc - arch, bowl or full circle - with adjustable radius, sweep, size and colour, and export ready-to-use SVG code
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Filter Numbers by Digit Count
Filter numbers by digit count in bulk — equals, range, at least or at most, keeping or removing the matches
Duplicate Number Counter
Quickly identify and count duplicate numbers in multiple sets of numerical data, sorted by repetition count
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Product Calculator
Multiply each line of numbers in bulk and get the total product of all groups, handy for chain and compound calculations
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Outlier Detector
Flag unusual values in your data with IQR, Z-score or MAD detection, and see a deviation score for every number
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Combination Generator
One group of numbers per line — enumerate every combination that picks one number from each group, with custom joiners and dedupe
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Repeated Digit Finder
Filter numbers by how often a digit repeats — a specific digit or any digit, with at-least or exactly-N rules
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Big Random Number Generator
Generate extra-long random numbers with a chosen digit count, with optional leading zeros and dedupe — produced as text, so no precision loss
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Exclude Digit Filter
Filter numbers by the digits they contain — check any position or one position counted from the right, keeping or removing the matches
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Special Number Generator
Generate square, cube, triangular, prime, Fibonacci and perfect numbers in one click, each with its formula
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Add Leading Zeros
Pad numbers with zeros to a target length in bulk — left or right, with optional decimal alignment and leading-zero cleanup
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Number Frequency Counter
Analyse how values are distributed: how many times each one appears, its share, the cumulative share, and how many distinct values there are
Thousand Separator
Automatically add separators to long numbers by thousands place for easier reading and understanding
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Anagram Duplicate Finder
Find numbers that are rearrangements of each other by digit composition, reversal or exact match, then filter to the duplicates or the unique ones
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Batch Math Calculator
Apply addition, subtraction, multiplication, division or modulo to a list of numbers at once, with a custom fixed value and precision
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Dot Matrix Number Generator
Render numbers, times and dates as a 5x7 dot matrix with a retro LED look, with dot styles, zoom levels and several board colour themes
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Amount Splitter
Split a total amount into equal, weighted or random shares that always add back up to the exact total - ideal for bill splitting and cost apportioning
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Number Splitter
Split a list of numbers into a given number of parts — sequential, interleaved or random, with optional dedupe
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Standard Deviation Calculator
Compute count, sum, average, standard deviation, minimum, maximum and range for each line of data, with sample or population formulas
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Number Omission Statistics
One group per line — count how often each number appears and how long it has been missing, with hit rate, current omission and max omission
Duplicate Number Finder
One-click to filter out all duplicate numbers in the number list and display their occurrence count
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Number Sequence Generator
Generate classic sequences — arithmetic, geometric, Fibonacci, Lucas, square, triangular — with the step difference and running total for every term, plus min/max/mean
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Palindrome Checker
Check whether numbers read the same forwards and backwards, optionally ignoring signs and decimal points, and list only palindromes or only non-palindromes
Compare Two Number Lists
Compare two sets of number lists to quickly find the difference values and unique numbers between them
Number Sorter
One-click to sort number lists in ascending or descending order
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Compare Multiple Number Sets
Use the first line as the basis and compare it with every other line — shared numbers, basis-only and line-only values
Permutation Calculator
Calculate ordered number permutations online, supporting custom number of elements and selection quantity
Random Number Generator
Generate a batch of random numbers within a min-max range, with a custom count and separator
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Geometry Calculator
Enter point coordinates to auto-detect the figure, compute sides, angles, area and perimeter, decide properties such as equilateral, isosceles, right, parallelogram or square numerically, and verify claims like AB = CD, AB // CD or AB ⊥ CD
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Sequence Pattern Detector
Detect the pattern of each number sequence line by line: constant, arithmetic, geometric, finite differences, second-order linear recurrence, periodic, plus common sequences such as primes, squares, cubes, triangular numbers, factorials and powers of two - with the reasoning, general term and next-term prediction
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Matrix Calculator
Compute matrix multiplication, addition, transpose, determinant, inverse, rank and trace at once - separate two matrices with a blank line, LU with partial pivoting for the determinant and Gauss-Jordan for the inverse
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Fractal Tree Generator
Draw a recursive fractal tree on canvas and label every node with a number - binary, ternary, Pythagoras and Sierpinski shapes with sequential, binary-path, Fibonacci or seeded random numbering
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Probability Distribution Calculator
Pick one of seven distributions (normal, binomial, Poisson, uniform, exponential, geometric, hypergeometric) and get a PMF/PDF and CDF table, a text bar chart and a summary of mean/variance/SD/mode; combinatorics run in log space, so binomial n=200 never overflows
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Statistics Calculator
Batch statistics per line: mean, median, mode, harmonic and geometric mean, min/max, range, variance, standard deviation, sum of squares, sum and count - with population or sample variance
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3D Function Plotter
Enter one function z=f(x,y) per line and get a colour-shaded 3D surface drawn with isometric projection, painter-algorithm occlusion and adjustable azimuth/elevation, plus sampling statistics and sample point tables
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Combinatorial Design Generator
Generate Latin squares, Steiner triple systems STS(v), balanced incomplete block designs BIBD(v, k, lambda) and pairwise covering arrays, with Bose construction, greedy plus backtracking and clear reasons for infeasible parameters
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Next Number in Sequence
Infer the next term of a sequence from its first few terms: arithmetic, geometric, finite differences, second-order linear recurrence and well-known sequences such as Fibonacci, primes, squares, factorials and Catalan numbers - every model is verified against the known terms
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Polynomial Root Finder
Solve polynomial equations online: Durand-Kerner returns all roots including complex ones, plus Newton and bisection methods with step-by-step iterations
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Cartesian Product Calculator
One set per line - list every combination of the Cartesian product A x B x C, with a custom joiner, optional grouping and the exact product size
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Regex Tester
Test a regex against sample text with g, gi, gm, gim, gs or gims flags and find, replace or split modes, listing every match with content, position, length, capture groups and line number, clear syntax-error messages and safe zero-width handling
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Subset Generator
One set per line - list every subset (the power set) with an iterative bit-mask loop, filter or group by subset size, and get the exact subset total
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Set Calculator
One set per line - get the union, intersection, difference, symmetric difference and complement at once, plus a Venn diagram count summary, with exact handling of very long integers
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Discrete Log Solver
Solve g^x ≡ h (mod p) for x with Baby-step Giant-step, brute force and Pohlig-Hellman side by side; one g,h,p per line, automatic order detection, no-solution detection and g^x mod p = h verification
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Math Worksheet Generator
Generate primary-school arithmetic drills from a few parameters - operation, question count and value limit - with a result table and a printable worksheet, answers shown or hidden, and a seed that reproduces the same set
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Finite State Machine Simulator
Online finite state machine simulator: paste a transition table (comma or arrow notation) to run DFA and NFA machines with epsilon transitions, plus determinism checks, reachable and unreachable states, and a step-by-step trace for each test string
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Nash Equilibrium Calculator
Analyze bimatrix and zero-sum games: strict/weak dominated strategy elimination, pure and 2x2 mixed Nash equilibria, zero-sum saddle points, maximin security strategies and game value
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Prime Factorization Calculator
Factor numbers into primes in batch - product and exponent form plus the divisor count and divisor sum, for integers up to 18 digits
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Integer Partition Generator
List every addition combination that sums to a number (integer partitions, order ignored), group them by addend count, or count them - with batch input and exact BigInt counting
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Truth Table to Boolean Expression
Turn a truth table (its output column or the list of rows that output 1) into a minimized Boolean expression with Quine-McCluskey, giving minimal SOP and POS plus the canonical sum and a row-by-row verification
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Elliptic Curve Calculator
Compute point addition, doubling, scalar multiplication, negation and curve order on y²=x³+ax+b (mod p) over a finite field - modular inverse via extended Euclid, scalar multiplication via double-and-add with step output, secp256k1 presets, all exact with BigInt
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CRC Calculator
Batch-compute eight standard CRCs (CRC-8, CRC-8/MAXIM, CRC-16/ARC, CRC-16/CCITT-FALSE, CRC-16/XMODEM, CRC-16/MODBUS, CRC-32, CRC-32C) - one record per line, UTF-8 text / hex / decimal byte input, per-row verification and byte-by-byte steps
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GCD and LCM Calculator
Find the GCD and LCM of each line of integers in batch, with the Euclidean algorithm steps and support for very long numbers
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Percentage Calculator
Batch percentage math from two numbers per line - what percent, percent of a value, change rate, increase or decrease, with the formula shown
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Prime Number Checker
Check whether numbers are prime, list primes in a range, or find the Nth prime - Miller-Rabin for large numbers and the smallest factor for composites
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Finite Difference Calculator
Compute every order of differences for each series and print a staircase difference table - a constant row reveals the polynomial degree and the leading difference, and up to degree 3 the Newton forward formula is recovered
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Boolean Expression Converter
Convert between SOP and POS forms, swap minterms and maxterms, and translate truth-table row numbers - a hand-written parser enumerates the truth table and returns canonical SOP/POS with Sigma-m / Pi-M indexes
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Knapsack Solver
Solve the 0/1 knapsack and unbounded knapsack online - enter items as "weight,value", set the capacity, and get the optimal combination with its best total value, total weight and remaining capacity
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Recursion Visualizer
Step through 8 classic recursive algorithms (factorial, fibonacci, hanoi, binary search, permutations, subsets, recursive GCD, merge sort) call by call, with an indented call tree, total calls, max depth and duplicate-subproblem statistics, plus a node cap for trimming
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LLL Lattice Reduction Tool
A teaching demo of LLL lattice basis reduction and the low-density subset-sum (knapsack) attack: feed a lattice basis or a knapsack instance and get the reduced basis, norms and a verified 0/1 solution vector, with an honest failure notice when reduction cannot recover it
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Truth Table Generator
Enter a Boolean expression and get the full truth table plus the minterm form (sum of products) and maxterm form (product of sums) - NOT/AND/OR/XOR/implication/equivalence, up to 8 variables
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Fibonacci Calculator
Compute the Nth Fibonacci or Lucas number, the first N terms, or any index range - fast doubling handles the 10000th term in milliseconds
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Compression Simulator
Data compression simulator: enter one or more texts, simulate lossless Huffman coding and LZ77, and compare original vs compressed bit counts, compression ratio and Shannon entropy, with a full Huffman code table and LZ77 triple breakdown
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Karnaugh Map Solver
Enter minterms and don't cares to get the minimal SOP and POS via Quine-McCluskey, a Gray-code Karnaugh map grid with every group marked, plus the prime implicant count and an AND/OR/NOT gate estimate
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Graph Algorithm Solver
Compute adjacency list, BFS/DFS traversal, shortest path (Dijkstra for weighted graphs), connected and strongly connected components, topological sort, minimum spanning tree and adjacency matrix from an edge list, with clear notices for cycles, self loops, duplicate edges and negative weights
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Pi Nth Digit Lookup
Look up which digit stands at decimal position 1 to 1,000,000 of pi, with five digits of context on each side; the first million decimals are preloaded on the server, and several positions can be queried at once
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Advanced Stats Calculator
Get IQR, skewness, kurtosis, mode, coefficient of variation, Shannon entropy, T statistic and per-point Z scores in one run - Excel-compatible definitions (QUARTILE.INC / SKEW / KURT), with a dash instead of NaN when a metric is undefined
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Mental Math Trainer
Timed mental arithmetic drills for addition, subtraction, multiplication and division with difficulty, operation type and per-question time limits
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Binary Practice
Four-mode binary conversion drills - binary to decimal, decimal to binary, bit-flipping challenge and quick conversion - with bit-weight visualisation
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Number Memory Test
Flash a number, recall it from memory. Digit length adapts to your accuracy, with stats for accuracy, average response time and best streak
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Sudoku Online
Play sudoku online with four difficulty levels, pencil-mark notes, hints, error checking and full solution, all keyboard accessible
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Sliding Puzzle
The classic sliding tile puzzle from 3x3 up to 6x6, always solvable thanks to inversion-parity checking, with arrow-key controls and hints
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Prime Number Game
Click every prime number in the grid within 60 seconds - correct picks score points, mistakes cost you - and sharpen your number sense
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Memory Matching Game
A flip-and-match memory game with up to 20 number pairs across four difficulty levels, tracking your time and number of attempts
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Number Swap Puzzle
Sliding number puzzle from 3x3 to 5x5 with three shuffle intensities, best-time records and hints for misplaced tiles
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