Free utilities
Quick tools for everyday tasks.
Converters, validators, text helpers, colour checks, and developer utilities. No sign-in required.
Every utility runs in your browser, with no uploads or external processing.
Collection
Browse 300 utilities
300 utilities
- Binary ↔ TextEncoding & identifiersConvert UTF-8 text to grouped binary bytes and back.
- Base64 Encode / DecodeEncoding & identifiersEncode or decode Base64 without corrupting UTF-8 text.
- URL Encode / DecodeEncoding & identifiersPercent-encode or decode URL component text.
- JSON Formatter & ValidatorStructured data & developerValidate, format, or compact JSON with clear parse errors.
- JSON ↔ CSVStructured data & developerConvert safely quoted CSV and JSON records in either direction.
- Query String Parser & BuilderStructured data & developerInspect query parameters or build a correctly encoded query string.
- JWT Payload DecoderSecurity & webDecode and format an unverified JSON Web Token payload.
- Unix Timestamp ConverterDates & numbersConvert Unix seconds or milliseconds to readable dates and back.
- UUID GeneratorEncoding & identifiersGenerate one or a bounded batch of browser-created UUIDs.
- SHA-256 Hash GeneratorSecurity & webHash UTF-8 text with the browser Web Crypto API.
- Text Case ConverterText & writingSwitch text between common letter and identifier cases.
- Slug GeneratorText & writingTurn a title into a clean, Unicode-friendly URL slug.
- Word / Character CounterText & writingCount words, characters, lines, and UTF-8 bytes.
- HTML Escape / UnescapeEncoding & identifiersEscape text for HTML or decode HTML character references.
- Regex TesterText & writingTest a JavaScript regular expression against bounded text input.
- Text DiffText & writingCompare two blocks of text with a line-oriented diff.
- Colour Contrast CheckerColour & designCalculate the WCAG contrast ratio between two valid colours.
- Hex / RGB / HSL ConverterColour & designConvert a valid colour between Hex, RGB, and HSL formats.
- Lorem Ipsum GeneratorText & writingGenerate a bounded amount of placeholder words or paragraphs.
- URL Inspector / NormalizerSecurity & webParse, inspect, and normalize the parts of a URL.
- Reverse TextText & writingReverse text by Unicode code point.
- Sort LinesText & writingSort bounded lines in ascending or descending order.
- Shuffle LinesText & writingRandomly reorder lines with browser cryptography.
- Remove Duplicate LinesText & writingKeep the first occurrence of each repeated line.
- Trim Blank LinesText & writingRemove blank lines from the start and end of text.
- Add Line NumbersText & writingPrefix every line with a padded line number.
- Remove Line NumbersText & writingRemove generated number-and-colon prefixes from lines.
- Text RepeaterText & writingRepeat text a bounded number of times with a separator.
- Split TextText & writingSplit text on one exact separator into lines.
- Join LinesText & writingJoin lines with one exact separator.
- Text to BulletsText & writingPrefix non-blank lines with a chosen bullet marker.
- Sentence CounterText & writingCount sentence-ending punctuation groups in text.
- Reading Time EstimatorText & writingEstimate reading time from word count and reading speed.
- Alphabetize WordsText & writingSort whitespace-delimited words alphabetically.
- Remove Extra WhitespaceText & writingCollapse whitespace runs and trim the result.
- Find & ReplaceText & writingReplace every literal occurrence of a text fragment.
- Text Prefix / SuffixText & writingAdd fixed text before and after every line.
- Markdown to Plain TextText & writingRemove common Markdown markers while preserving readable text.
- Text ↔ Hex (UTF-8)Encoding & identifiersConvert UTF-8 text to hexadecimal bytes and back.
- ASCII / Unicode Code PointsEncoding & identifiersConvert text to U+ code points or code points back to text.
- ROT13Encoding & identifiersApply the reversible ROT13 substitution to ASCII letters.
- Caesar CipherEncoding & identifiersShift ASCII letters by a chosen signed amount.
- URL-safe Base64 ConverterEncoding & identifiersEncode or decode unpadded URL-safe Base64 as UTF-8.
- Base32 Encode / DecodeEncoding & identifiersEncode or decode UTF-8 with RFC 4648 Base32.
- HTML Tag StripperEncoding & identifiersRemove tags and comments while returning plain text only.
- Unicode NormalizerEncoding & identifiersNormalize text to NFC, NFD, NFKC, or NFKD.
- Unicode InspectorEncoding & identifiersList code points, UTF-16 units, and positions for text.
- Random String GeneratorEncoding & identifiersGenerate bounded strings with browser cryptography.
- Random Number GeneratorEncoding & identifiersGenerate unbiased bounded safe integers with browser cryptography.
- Random Bytes GeneratorEncoding & identifiersGenerate a bounded batch of cryptographic random bytes as hex.
- UUID ValidatorEncoding & identifiersValidate UUID layout, variant, and version.
- ULID GeneratorEncoding & identifiersGenerate timestamped ULIDs with browser cryptography.
- Nano ID GeneratorEncoding & identifiersGenerate compact IDs from a bounded alphabet and length.
- JSON Key SorterStructured data & developerRecursively sort object keys and format the JSON result.
- JSON Array StatisticsStructured data & developerCalculate summary statistics for a numeric JSON array.
- NDJSON Formatter / ValidatorStructured data & developerValidate and compact one JSON value per non-blank line.
- JSON Escape / UnescapeStructured data & developerEscape text as a JSON string or decode a JSON string literal.
- CSV Delimiter ConverterStructured data & developerConvert correctly quoted comma, tab, or semicolon data.
- CSV Column ExtractorStructured data & developerExtract one named or numbered column from delimited rows.
- CSV Row CounterStructured data & developerCount parsed rows and columns in quoted delimited text.
- XML Formatter & ValidatorStructured data & developerCheck XML well-formedness and indent element-only content.
- XML Escape / UnescapeStructured data & developerEscape or decode the five predefined XML entities.
- HTML Table GeneratorStructured data & developerTurn delimited rows into escaped HTML table source code.
- HTML to TextStructured data & developerConvert common HTML blocks and entities into readable text.
- JavaScript String Escape / UnescapeStructured data & developerEscape string contents or decode standard JavaScript escapes without evaluation.
- CSS MinifierStructured data & developerRemove standalone comments and safe redundant whitespace from CSS text.
- SQL Keyword FormatterStructured data & developerUppercase common SQL keywords and add basic clause line breaks.
- HTTP Status LookupStructured data & developerLook up common HTTP status meanings from a local table.
- MIME Type LookupStructured data & developerLook up common MIME types by file extension.
- Cron Expression ExplainerStructured data & developerValidate and explain a basic standard five-field cron expression.
- Date Difference CalculatorDates & numbersCalculate the signed calendar-day difference between two dates.
- Date Add / SubtractDates & numbersAdd or subtract calendar days, weeks, months, or years.
- Age CalculatorDates & numbersCalculate completed years, months, and days on a chosen date.
- Business Days CalculatorDates & numbersCount weekdays in an inclusive date range.
- Time Zone ConverterDates & numbersDisplay an offset-qualified ISO timestamp in an Intl time zone.
- ISO Week Number CalculatorDates & numbersFind the ISO week year, week number, and weekday for a date.
- Number Base ConverterDates & numbersConvert bounded integers between binary, octal, decimal, and hex.
- Roman Numeral ConverterDates & numbersConvert canonical Roman numerals and integers from 1 to 3999.
- Number to WordsDates & numbersWrite a bounded English integer in words.
- Percentage CalculatorDates & numbersCalculate a percentage, share, or percentage change.
- Ratio SimplifierDates & numbersReduce two bounded integers to their simplest ratio.
- Average CalculatorDates & numbersCalculate the arithmetic mean of a bounded number list.
- Rounding CalculatorDates & numbersRound, floor, ceil, or truncate to chosen decimal places.
- Temperature ConverterDates & numbersConvert Celsius, Fahrenheit, and Kelvin values.
- Data Size ConverterDates & numbersConvert decimal and binary byte units.
- Colour Palette GeneratorColour & designGenerate a deterministic seeded palette or a crypto-random palette.
- Gradient GeneratorColour & designBuild validated linear-gradient CSS from two colours.
- Colour MixerColour & designMix two opaque sRGB hex colours by percentage.
- Colour Shade GeneratorColour & designGenerate bounded tints and shades around one colour.
- Hex Colour ValidatorColour & designValidate and normalize #RGB or #RRGGBB colours.
- CSS Box Shadow GeneratorColour & designBuild box-shadow CSS from bounded numeric controls.
- CSS Border Radius GeneratorColour & designBuild four-corner border-radius CSS code.
- CSS Clamp CalculatorColour & designCalculate a simple fluid pixel size with CSS clamp().
- Password GeneratorSecurity & webGenerate bounded passwords with browser cryptography.
- Password Strength EstimatorSecurity & webEstimate password strength with transparent local heuristics.
- SHA-1 / SHA-384 / SHA-512 Hash GeneratorSecurity & webHash UTF-8 text with a selected Web Crypto digest.
- HMAC GeneratorSecurity & webCreate a hexadecimal HMAC with Web Crypto.
- URL Slug / Query CleanerSecurity & webNormalize an HTTP URL and remove common tracking parameters.
- User-Agent ParserSecurity & webApply basic local rules to summarize a User-Agent string.
- HTTP Header Formatter / ParserSecurity & webValidate and format an HTTP header block as text and JSON.
- Line Ending ConverterText & writingConvert text between LF, CRLF, and CR line endings.
- Word WrapText & writingWrap bounded Unicode text to a chosen line width.
- Tabs / Spaces ConverterText & writingExpand tabs or compact leading indentation with fixed tab stops.
- Whitespace VisualizerText & writingShow spaces, tabs, and line endings with visible text markers.
- Word Frequency CounterText & writingCount and rank bounded Unicode word occurrences.
- Character Frequency CounterText & writingCount Unicode code-point occurrences with inspectable labels.
- Line Length InspectorText & writingReport code-point and UTF-8 byte lengths for each line.
- Duplicate Word FinderText & writingFind adjacent repeated Unicode words in bounded copy.
- Palindrome CheckerText & writingCheck a phrase after deterministic Unicode normalization.
- Anagram CheckerText & writingCompare two phrases by normalized Unicode letters and numbers.
- Initials GeneratorText & writingCreate bounded initials from Unicode words in a name or phrase.
- Text List FormatterText & writingJoin non-blank lines into a readable and/or list.
- Email Candidate ExtractorText & writingExtract and deduplicate email-shaped candidates from text.
- Web Link ExtractorText & writingExtract and normalize absolute HTTP and HTTPS links from text.
- Literal Line FilterText & writingKeep or remove lines containing exact literal text.
- List Set OperationsText & writingFind union, intersection, or one-sided differences between line lists.
- Ascii85 Encode / DecodeEncoding & identifiersConvert UTF-8 text with bounded Adobe-style Ascii85.
- Base58 Encode / DecodeEncoding & identifiersConvert bounded UTF-8 bytes with the Bitcoin Base58 alphabet.
- Base45 Encode / DecodeEncoding & identifiersEncode or decode bounded UTF-8 bytes with Base45.
- Quoted-Printable Encode / DecodeEncoding & identifiersEncode or decode bounded UTF-8 quoted-printable text.
- Morse Code ConverterEncoding & identifiersConvert supported Latin text and International Morse symbols.
- NATO Phonetic ConverterEncoding & identifiersConvert supported letters and digits to or from code words.
- Text Data URI Encode / DecodeEncoding & identifiersBuild or inspect bounded UTF-8 text/plain data URIs.
- UUID Version 5 GeneratorEncoding & identifiersDerive a deterministic UUID from a namespace UUID and UTF-8 name.
- ULID DecoderEncoding & identifiersInspect a canonical ULID timestamp and randomness field.
- Snowflake ID DecoderEncoding & identifiersBreak a bounded 64-bit Snowflake ID into time, datacentre, worker, and sequence fields.
- ISBN Checksum ValidatorEncoding & identifiersValidate ISBN-10 or ISBN-13 layout and check digits.
- IBAN Checksum ValidatorEncoding & identifiersNormalize an IBAN-shaped value and verify its mod-97 checksum.
- Luhn Check Digit CalculatorEncoding & identifiersCalculate or validate a bounded decimal Luhn check digit.
- EAN Check Digit CalculatorEncoding & identifiersCalculate or validate EAN-8 and EAN-13 check digits.
- MAC Address FormatterEncoding & identifiersValidate EUI-48/EUI-64 hexadecimal layout and switch separators.
- Hex Byte Order ConverterEncoding & identifiersReverse a bounded sequence of complete hexadecimal bytes.
- JSON Pointer EvaluatorStructured data & developerResolve an escaped JSON Pointer against bounded JSON.
- JSON Pointer Flattener / UnflattenerStructured data & developerRound-trip JSON through a flat map of escaped pointer paths.
- JSON Merge PatchStructured data & developerApply a bounded merge patch to a JSON document.
- JSON Tree StatisticsStructured data & developerCount containers, keys, values, and maximum depth in JSON.
- JSON Duplicate Key DetectorStructured data & developerFind repeated member names within individual JSON objects.
- NDJSON ↔ JSON ArrayStructured data & developerConvert bounded JSON Lines and JSON arrays in either direction.
- INI ↔ JSON ConverterStructured data & developerConvert a deterministic INI subset and string-valued JSON sections.
- Dotenv ↔ JSON ConverterStructured data & developerConvert bounded dotenv assignments and string-valued JSON.
- Markdown Table GeneratorStructured data & developerTurn bounded delimited rows into escaped Markdown table source.
- Markdown Outline ExtractorStructured data & developerExtract bounded ATX and Setext headings into an outline.
- Markdown Link ExtractorStructured data & developerExtract bounded inline links and autolinks as text records.
- Regex Literal EscaperStructured data & developerEscape text for literal matching in a JavaScript regular expression.
- Bounded Glob TesterStructured data & developerMatch path lines with a small deterministic glob subset.
- Unix Permission CalculatorStructured data & developerConvert octal permissions and symbolic rwx text.
- Semantic Version ComparatorStructured data & developerCompare two strict semantic-version precedence values.
- JSON to TypeScript TypeStructured data & developerInfer bounded TypeScript type source from example JSON.
- TypeScript String Union GeneratorStructured data & developerTurn unique text lines into an escaped string-literal union.
- HTML Meta Tag GeneratorStructured data & developerGenerate escaped title, description, canonical, robots, and theme-colour source.
- SQL INSERT GeneratorStructured data & developerGenerate bounded INSERT source from consistently shaped delimited rows.
- CSS Specificity CalculatorStructured data & developerCalculate specificity tuples for bounded selector text.
- Day of Year CalculatorDates & numbersFind a UTC calendar date's ordinal day and the number of days in its year.
- Leap Year CheckerDates & numbersApply Gregorian leap-year rules to a four-digit year.
- Month Calendar GeneratorDates & numbersGenerate a plain-text Gregorian month calendar.
- Recurring Date GeneratorDates & numbersGenerate a bounded daily, weekly, monthly, or yearly date series.
- Time Arithmetic CalculatorDates & numbersApply a bounded signed-seconds offset to a time of day.
- Duration FormatterDates & numbersBreak bounded milliseconds into readable day and time units.
- ISO Duration BreakdownDates & numbersBreak down a bounded day-and-time ISO duration subset.
- Decimal / Fraction ConverterDates & numbersConvert bounded terminating decimals and exact fractions.
- Fraction CalculatorDates & numbersAdd, subtract, multiply, or divide exact bounded fractions.
- GCD / LCM CalculatorDates & numbersCalculate exact greatest common divisor and least common multiple.
- Prime Number InspectorDates & numbersCheck primality and report the smallest factor of a bounded integer.
- Scientific Notation ConverterDates & numbersNormalize bounded decimal values to or from scientific notation.
- Significant Figures RounderDates & numbersRound a finite number to a chosen count of significant figures.
- Combinations / Permutations CalculatorDates & numbersCalculate exact bounded nCr or nPr values with BigInt.
- Percentile CalculatorDates & numbersCalculate a bounded percentile with disclosed linear interpolation.
- Linear Interpolation CalculatorDates & numbersInterpolate or extrapolate y from two finite coordinate points.
- Decimal Degrees / DMS ConverterDates & numbersConvert latitude or longitude between decimal and DMS text.
- 32-bit Bitwise CalculatorDates & numbersApply bounded unsigned 32-bit AND, OR, XOR, and shift operations.
- Circle Geometry CalculatorDates & numbersCalculate radius, diameter, circumference, and area from one known measurement.
- Quadratic Equation SolverDates & numbersCalculate the discriminant and real roots of a bounded quadratic equation.
- CSS Filter GeneratorColour & designBuild a validated CSS filter declaration from bounded visual controls.
- Hex / CMYK Colour ConverterColour & designConvert opaque sRGB hex and formula-based CMYK values.
- sRGB Colour DistanceColour & designCalculate straight Euclidean distance between two sRGB colours.
- Colour Vision SimulatorColour & designApply fixed approximate colour-vision matrices to an sRGB colour.
- Aspect Ratio CalculatorColour & designReduce dimensions and calculate a matching missing width or height.
- Pixel / REM ConverterColour & designConvert CSS pixels and rem units with a chosen root size.
- Modular Type Scale GeneratorColour & designGenerate bounded typography steps from a base size and ratio.
- Spacing Scale GeneratorColour & designGenerate bounded spacing tokens from a base size and multiplier.
- CSS Grid Template GeneratorColour & designBuild validated repeat/minmax grid source from compact controls.
- Flexbox Shorthand BuilderColour & designBuild a validated CSS flex grow/shrink/basis declaration.
- CSS Transform GeneratorColour & designBuild bounded translate, rotate, scale, and skew source.
- Cubic Bézier Timing SamplerColour & designSample a valid CSS cubic-bezier timing curve locally.
- SVG ViewBox CalculatorColour & designBuild a validated viewBox and report viewport scale factors.
- CSS Triangle GeneratorColour & designGenerate bounded border-based triangle CSS source.
- IPv4 Subnet CalculatorSecurity & webCalculate network, broadcast, mask, and bounded host ranges from CIDR.
- IPv4 / Integer ConverterSecurity & webConvert dotted IPv4 addresses and unsigned 32-bit integers.
- IPv6 Expander / NormalizerSecurity & webExpand and RFC-style compress a bounded IPv6 address.
- CIDR Membership CheckerSecurity & webCheck whether an IPv4 or IPv6 address belongs to a same-family CIDR.
- Same-Origin CheckerSecurity & webCompare two absolute HTTP(S) URLs by scheme, host, and effective port.
- Relative URL ResolverSecurity & webResolve a relative reference against an absolute HTTP(S) base URL.
- Hostname Syntax InspectorSecurity & webInspect bounded hostname labels and ASCII serialization locally.
- Cookie Header ParserSecurity & webParse a bounded Cookie request header into ordered name/value pairs.
- Set-Cookie InspectorSecurity & webInspect one bounded Set-Cookie line and common attributes.
- Cache-Control ParserSecurity & webParse bounded Cache-Control directives into ordered structured text.
- CSP Directive ParserSecurity & webParse a bounded Content-Security-Policy string by directives and tokens.
- Permissions-Policy ParserSecurity & webParse a bounded Permissions-Policy header subset into feature allowlists.
- Robots Directive ParserSecurity & webNormalize bounded robots meta or X-Robots-Tag directive text.
- Common Port LookupSecurity & webLook up selected TCP/UDP port uses from a fixed local reference.
- Diacritic RemoverText & writingRemove selected Unicode combining marks while preserving readable text.
- Smart Punctuation NormalizerText & writingConvert curly quotes, long dashes, ellipses, and selected spaces to plain text.
- Text Readability CalculatorText & writingCalculate disclosed English readability scores from bounded copy.
- Sentence SplitterText & writingSplit bounded text into ordered sentence records with source offsets.
- Text N-gram AnalyserText & writingCount and rank bounded word sequences from bigrams through five-grams.
- Text ConcordanceText & writingFind bounded literal keyword occurrences with offsets and nearby context.
- Number ExtractorText & writingExtract signed decimal or scientific-number tokens and their positions.
- Hashtag & Mention ExtractorText & writingExtract and deduplicate bounded hashtag and @mention candidates from text.
- Duplicate Sentence FinderText & writingFind repeated sentence units with deterministic case and whitespace normalisation.
- Text DedentText & writingRemove common visual indentation while preserving relative layout.
- Text TruncatorText & writingTruncate by Unicode code-point length with explicit omission metrics.
- Levenshtein Distance CalculatorText & writingCalculate bounded character edit distance between two text values.
- Lexical Diversity CalculatorText & writingCalculate bounded vocabulary-diversity metrics from Unicode words.
- Paragraph Length AnalyserText & writingReport per-paragraph words, sentences, and character lengths.
- Punctuation RemoverText & writingRemove Unicode punctuation with bounded preservation options.
- Control Character CleanerText & writingRemove bounded control characters with an explicit inspection ledger.
- CRC-32 ChecksumEncoding & identifiersCalculate a CRC-32/ISO-HDLC checksum over UTF-8 bytes.
- Hex Dump GeneratorEncoding & identifiersRender UTF-8 bytes as bounded offset, hexadecimal, and ASCII rows.
- Byte Array ConverterEncoding & identifiersConvert validated decimal byte lists and hexadecimal byte sequences.
- CSS Escape / UnescapeEncoding & identifiersEscape or decode bounded CSS identifier code points as text.
- MIME Encoded-Word ConverterEncoding & identifiersEncode or decode bounded UTF-8 MIME encoded-word text.
- UUID Version 7 GeneratorEncoding & identifiersGenerate bounded time-ordered UUID v7 identifiers with browser cryptography.
- UUID Timestamp InspectorEncoding & identifiersDecode embedded timestamps and fields from canonical UUID v1, v6, or v7 text.
- MongoDB ObjectId InspectorEncoding & identifiersInspect the timestamp and raw byte fields of a canonical ObjectId.
- ISBN-10 / ISBN-13 ConverterEncoding & identifiersConvert checksum-valid ISBN-10 and compatible 978 ISBN-13 values.
- ORCID ValidatorEncoding & identifiersValidate ORCID layout and its ISO 7064 Mod 11-2 check character.
- ISIN ValidatorEncoding & identifiersValidate ISIN syntax and its expanded Luhn check digit.
- VIN Checksum ValidatorEncoding & identifiersValidate the North American position-nine VIN checksum.
- Verhoeff Check Digit CalculatorEncoding & identifiersCalculate or validate a bounded decimal Verhoeff check digit.
- ASCII Table GeneratorEncoding & identifiersGenerate a bounded decimal, hexadecimal, character, and control-name reference.
- JSON Structural DiffStructured data & developerCompare parsed JSON and emit bounded JSON Pointer change records.
- JSON Patch ApplierStructured data & developerValidate and apply bounded RFC 6902 operations to JSON.
- CSV TransposerStructured data & developerTranspose a validated rectangular quoted delimited table.
- CSV JoinerStructured data & developerJoin two quoted tables by named key with an explicit join mode.
- CSV DeduplicatorStructured data & developerRemove duplicate parsed records using selected key columns.
- TOML ↔ JSON ConverterStructured data & developerConvert a disclosed bounded TOML scalar and table subset.
- Markdown to HTML SourceStructured data & developerConvert a bounded Markdown subset to escaped inert HTML source.
- CSS Custom Property ExtractorStructured data & developerExtract bounded CSS custom-property declarations as text records.
- CSS Media Query BuilderStructured data & developerBuild inert media-query source from bounded structured controls.
- Semantic Version Range TesterStructured data & developerTest strict semantic versions against a bounded comparator range subset.
- Gitignore TesterStructured data & developerApply bounded ordered ignore and negation rules to path text.
- File Path NormalizerStructured data & developerNormalize POSIX or Windows path segments without filesystem access.
- Cron Next RunsStructured data & developerCalculate bounded future UTC matches for a numeric five-field cron expression.
- HTTP Message ParserStructured data & developerParse one bounded HTTP/1-style start line, header block, and inert body.
- Content-Type ParserStructured data & developerParse a bounded media type and quoted parameter values.
- Robots.txt ParserStructured data & developerGroup bounded robots.txt agents and directives from pasted text.
- Sitemap XML InspectorStructured data & developerInspect bounded sitemap urlset XML text for URL records.
- Hreflang Tag GeneratorStructured data & developerValidate bounded locale and absolute-URL pairs and generate inert link source.
- Descriptive Statistics CalculatorDates & numbersCalculate bounded spread, quartile, variance, and mode statistics.
- Linear Regression CalculatorDates & numbersFit a bounded least-squares line to paired numeric points.
- Z-score CalculatorDates & numbersCalculate a bounded value's population or sample z-score.
- Prime FactorizationDates & numbersFactor a bounded integer into exact prime powers.
- Modular Arithmetic CalculatorDates & numbersCalculate exact bounded modular operations and inverses.
- Matrix CalculatorDates & numbersAdd, subtract, multiply, or transpose bounded numeric matrices.
- Vector CalculatorDates & numbersCalculate bounded vector sums, dot products, magnitudes, and angles.
- Right Triangle CalculatorDates & numbersSolve bounded right-triangle sides, angles, area, and perimeter.
- Haversine Distance CalculatorDates & numbersCalculate local great-circle distance between two coordinate pairs.
- Measurement Unit ConverterDates & numbersConvert bounded length, area, volume, and mass units.
- Fuel Economy ConverterDates & numbersConvert common distance-per-volume and volume-per-distance units.
- Pace CalculatorDates & numbersDerive bounded kilometre pace, speed, time, or distance values.
- Bandwidth Transfer Time CalculatorDates & numbersEstimate ideal transfer duration from data size and bit rate.
- Work Hours CalculatorDates & numbersTotal bounded same-day time intervals and explicit breaks.
- Date-Time Duration CalculatorDates & numbersCalculate exact elapsed time between two offset-qualified instants.
- Julian Date ConverterDates & numbersConvert bounded UTC instants and Julian Date numbers.
- Excel Serial Date ConverterDates & numbersConvert bounded spreadsheet serial dates in the 1900 or 1904 system.
- Nth Weekday CalculatorDates & numbersFind the first through fifth or last weekday in a chosen month.
- IEEE-754 Float InspectorDates & numbersEncode or decode bounded 32-bit and 64-bit floating-point fields.
- Two's Complement ConverterDates & numbersConvert signed integers and fixed-width two's-complement bit patterns.
- Advanced Colour Space ConverterColour & designConvert opaque sRGB colours to HSV, HWB, CIE Lab, and OKLab records.
- Delta E Colour DifferenceColour & designCalculate a disclosed perceptual Lab colour-difference metric.
- Alpha Compositing CalculatorColour & designComposite a translucent foreground colour over a background.
- Colour Temperature ConverterColour & designApproximate an sRGB colour from a bounded Kelvin temperature.
- CSS Named Colour LookupColour & designLook up fixed local CSS colour names and hexadecimal values.
- Colour Blend Mode CalculatorColour & designCalculate selected opaque sRGB channel blend formulas.
- PPI / Print Size CalculatorColour & designRelate pixel dimensions, print dimensions, PPI, and megapixels.
- Paper Size ConverterColour & designLook up local ISO and common US paper dimensions in multiple units.
- CSS Box Model CalculatorColour & designCalculate content, padding, border, and margin box dimensions.
- Object Fit CalculatorColour & designCalculate contain, cover, none, or scale-down image placement.
- Responsive Image Source GeneratorColour & designGenerate bounded inert srcset and sizes source from width candidates.
- CSS Clip Path GeneratorColour & designGenerate bounded polygon clip-path source from percentage points.
- CSS Font Shorthand BuilderColour & designValidate and assemble bounded CSS font shorthand source.
- Line Height CalculatorColour & designCalculate line-box size, unitless ratio, and extra leading.
- Image Crop CalculatorColour & designCalculate a maximal crop rectangle for a target aspect ratio.
- Sprite Sheet CalculatorColour & designCalculate bounded sprite-grid coordinates and background positions.
- IPv4 Range to CIDRSecurity & webCover an ordered IPv4 interval with a bounded minimal CIDR list.
- CIDR Subnet SplitterSecurity & webSplit one IPv4 or IPv6 CIDR into bounded equal child networks.
- CIDR Overlap CheckerSecurity & webCompare two same-family CIDRs for overlap and containment.
- IPv6 Subnet CalculatorSecurity & webCalculate canonical IPv6 network bounds and address count.
- DNS Zone ParserSecurity & webParse a bounded inert subset of DNS zone-file records.
- CORS Header ModelSecurity & webModel selected request and response-header CORS decisions locally.
- Referrer Policy SimulatorSecurity & webModel a Referer value for two HTTP(S) URLs and a selected policy.
- Content-Disposition ParserSecurity & webParse bounded disposition and filename parameter syntax.
- ETag ComparatorSecurity & webApply strong or weak comparison rules to two entity tags.
- SRI Generator / VerifierSecurity & webGenerate or compare bounded SHA integrity tokens for supplied text.
- PKCE GeneratorSecurity & webGenerate a bounded verifier and S256 challenge with browser cryptography.
- JWK Thumbprint CalculatorSecurity & webCalculate a SHA-256 thumbprint for supported public JWK members.
- PEM Block InspectorSecurity & webInspect bounded PEM labels, decoded byte lengths, and fingerprints.
- PBKDF2 Key DeriverSecurity & webDerive bounded PBKDF2 test vectors with explicit Web Crypto parameters.
- Password Hash InspectorSecurity & webParse recognised modular password-hash fields and declared parameters.
- IP Address ClassifierSecurity & webClassify an IPv4 or IPv6 address against fixed local special-purpose ranges.