Tools

Format JSON, convert files, edit images, work with PDFs and clean spreadsheets with browser-based tools for development and everyday tasks.

281 ready-to-use tools

Text

34 tools

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Subtitle Converter and Time ShifterConvert SRT and VTT subtitles, shift timings, detect overlaps, and extract text.

Text Diff CheckerCompare two texts by line or word and highlight additions and deletions. Inspect changes in documents, logs, or configuration text.

Text CleanupRemove blank lines and extra spaces, deduplicate or sort lines, and change letter case in pasted text.

Markdown PreviewPreview Markdown with tables, code highlighting, math formulas, and Mermaid diagrams. Export styled HTML from your browser.

Word and Character CounterCount characters, words, lines, paragraphs, and sentences, and estimate reading time for pasted text.

Letter Case ConverterChange text to uppercase, lowercase, title case, or sentence case. Copy the converted text without editing each word.

Naming Convention ConverterConvert names between camelCase, PascalCase, snake_case, and kebab-case for variables, fields, and filenames.

Find and Replace TextReplace matching text in bulk using a literal search or a JavaScript regular expression and a replacement string.

Line Prefix and Suffix ToolAdd a prefix, suffix, or sequential number to every line of a pasted list, then copy or download the transformed text.

Text Information ExtractorExtract email addresses, URLs, phone numbers, IP addresses, or numbers from pasted text using pattern matching.

Word Frequency CounterCount occurrences of Chinese and English words in text and sort the frequency list to find repeated terms.

Text ReverserReverse the order of characters, words, or lines in text. Select the unit of reversal before processing.

Chinese Placeholder Text GeneratorGenerate Chinese placeholder text by sentence or paragraph for layout prototypes and sample documents.

List Union, Intersection, and DifferenceCompare two line-separated lists and calculate their union, intersection, or difference to find shared or missing entries.

HTML to Plain Text ConverterRemove HTML tags and retain readable paragraphs and line breaks when converting HTML source to plain text.

Plain Text to HTML ConverterEscape text and convert paragraphs and line breaks into HTML that can be copied into a document or template.

Text Delimiter ConverterSplit text with a chosen separator and join the entries with a different delimiter for lists and data preparation.

Text Chunk SplitterSplit long text into consecutive chunks with a chosen character limit and inspect the resulting pieces.

Text Line WrapperInsert line breaks at a chosen column width to wrap long lines of plain text.

Text Truncation ToolShorten text to a chosen character limit and append a custom truncation marker.

Tabs and Spaces ConverterConvert indentation between tab characters and a chosen number of spaces in pasted text or code.

Whitespace VisualizerShow visible markers for spaces, tabs, line breaks, and non-breaking spaces to inspect hidden formatting.

Duplicate Line FinderFind repeated lines in text and report their occurrence counts and first positions without deleting the input.

Unicode Character InspectorInspect each character's Unicode code point, UTF-16 code units, and UTF-8 byte representation.

ASCII Character TableLook up ASCII characters, decimal and hexadecimal codes, and the names of control characters.

NATO Phonetic Alphabet ConverterConvert English letters to NATO spelling words or translate supported spelling words back to text. Digits are preserved.

Morse Code TranslatorTranslate English letters, digits, and supported punctuation to Morse code or decode dots and dashes.

Latin Braille Character ConverterConvert supported Latin letters and digits to Unicode Braille characters or decode supported Braille symbols.

ROT13 and ROT47 ConverterApply reversible ROT13 or ROT47 character substitution to text. These substitutions are not secure encryption.

Caesar Cipher Encoder and DecoderShift English letters by a selected offset to encode or decode a Caesar cipher for learning and puzzles.

Vigenere Cipher Encoder and DecoderEncode or decode alphabetic text with a keyword-based Vigenere cipher for classical cryptography exercises.

Latin Accent RemoverRemove accents and combining diacritical marks from Latin letters to normalize text for comparison.

Zero-Width Character RemoverDetect and remove common zero-width characters and byte-order marks from pasted text.

Unicode NormalizerNormalize text to NFC, NFD, NFKC, or NFKD to compare canonical and compatibility forms of Unicode characters.

Data conversion

5 tools

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JSON FormatterValidate, format, and minify JSON without changing number precision. Browse a collapsible tree, search nodes, and copy JSON Pointer paths.

Base64 Encoder and DecoderEncode UTF-8 text as Base64 or decode a Base64 string to readable text. Copy or download the result in your browser.

URL Encoder and DecoderPercent-encode text for URLs or decode escaped characters. Choose URL or component encoding for paths and query values.

YAML / JSON ConverterConvert YAML to JSON or JSON to YAML, with syntax validation and duplicate YAML key detection.

CSV / JSON ConverterConvert CSV tables to JSON or JSON arrays to CSV. Configure headers and delimiters, then copy or download the output.

Developer tools

18 tools

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Mermaid Diagram EditorEdit flowcharts and sequence diagrams with live preview and SVG or PNG export.

Unix Timestamp ConverterConvert Unix timestamps in seconds or milliseconds to dates, or convert a local date and time back to a timestamp.

UUID Generator and SHA Hash CalculatorGenerate UUIDs in batches or calculate SHA-256, SHA-384, and SHA-512 text digests locally in your browser.

JavaScript Regex TesterTest JavaScript regular expressions against text, highlight matches, and inspect match positions and capture groups.

SQL FormatterFormat SQL queries with a selected database dialect, indentation, and keyword style. No database connection is required.

Cron Expression HelperExplain five-field Cron expressions and preview the next run times in a selected time zone. No jobs are scheduled.

cURL ParserParse a cURL command into structured HTTP request data.

cURL Code GeneratorConvert cURL into Fetch, Axios, Go, Python, or raw HTTP code.

JSON DiffCompare two JSON values and generate an RFC 6902 Patch.

JSON Patch ApplierValidate and apply an RFC 6902 Patch to JSON.

JSON Schema GeneratorInfer a Draft 2020-12 JSON Schema from a JSON sample.

OpenAPI ValidatorParse and validate an OpenAPI document in JSON or YAML.

OpenAPI Example GeneratorGenerate JSON request examples from OpenAPI schemas.

JWK / PEM Key ConverterConvert keys between JWK and standard public or private PEM formats.

X.509 Certificate ViewerInspect X.509 certificate subjects, issuers, validity, and fingerprints.

SSH Public Key FingerprintCalculate the SHA-256 fingerprint of an OpenSSH public key.

Webhook Signature GeneratorGenerate GitHub, Stripe, or Shopify-style HMAC signatures.

Token EntropyEstimate a token's character pool, theoretical entropy, and repetition.

Security

10 tools

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JWT DecoderDecode JWT headers and payloads locally and inspect time claims. Decoding does not verify the token signature.

Password GeneratorGenerate passwords with browser cryptographic randomness. Choose length and character sets, then copy the generated passwords.

HMAC CalculatorCalculate an HMAC for a message and key using SHA-256, SHA-384, or SHA-512 locally in your browser.

AES-GCM Text EncryptionEncrypt or decrypt text with a passphrase using AES-GCM, a random salt, and locally derived key material.

PBKDF2 Key DerivationDerive key bytes from a password, salt, iteration count, and selected hash algorithm using PBKDF2.

HKDF Key DerivationExpand input key material using a salt and context information with the HKDF key derivation function.

CRC-32 Checksum CalculatorCalculate the CRC-32 checksum of text and display its hexadecimal value for error-detection comparisons.

Adler-32 Checksum CalculatorCalculate the Adler-32 checksum of text and inspect the hexadecimal checksum value.

TOTP Generator and CheckerGenerate and check time-based one-time passwords from a Base32 secret using RFC 6238 settings.

RSA-OAEP Key Pair GeneratorGenerate an RSA-OAEP public and private key pair in your browser and export the keys as PEM text.

Images

17 tools

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QR Code Generator and ReaderGenerate a downloadable QR code from text or a URL, or read a QR code from a local image without using a camera.

Image CompressorCompress a local image by adjusting output dimensions, format, and quality, then download the processed image.

Color Converter and Contrast CheckerConvert HEX, RGB, HSL, and OKLCH colors and check text contrast against a background using WCAG AA and AAA thresholds.

Image Annotation and RedactionAdd arrows, rectangles, numbered markers, and solid covers to local images. Undo edits and export a flattened PNG in your browser.

Batch Image ResizerResize images in batches to maximum dimensions while preserving proportions.

Image CropperDrag a crop region, choose an aspect ratio, and preview batch image crops.

Image Format ConverterConvert batches between PNG, JPEG, and WebP.

Image Rotation and FlipRotate or flip images horizontally and vertically in batches.

Image WatermarkAdd a text watermark to selected positions on multiple images.

Image EXIF ViewerInspect camera, time, orientation, and location EXIF metadata.

Image Metadata RemoverRe-encode images to remove EXIF and location metadata.

SVG OptimizerClean and minify SVG source with standard SVGO rules.

SVG RasterizerRender SVG files as PNG, JPEG, or WebP at a selected width.

Favicon GeneratorGenerate common Favicon, Apple Touch, and PWA icon sizes.

Color Palette ExtractorExtract a dominant color palette from image pixels.

Image CollageCombine multiple images into a regular grid collage.

Image Grid SplitterSplit an image into separate files using a custom row and column grid.

Chinese language

7 tools

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Simplified and Traditional Chinese ConverterConvert Chinese text between Simplified Chinese, Taiwan Traditional Chinese, and Hong Kong Traditional Chinese.

Chinese to Pinyin ConverterConvert Chinese characters to Pinyin with tone marks, tone numbers, or no tones. Review pronunciation in context.

Fullwidth and Halfwidth ConverterConvert fullwidth ASCII letters, digits, and punctuation to halfwidth forms, or convert them in the opposite direction.

Chinese and English Punctuation ConverterReplace common Chinese punctuation with English equivalents or convert English punctuation to Chinese forms.

Number to Chinese NumeralsConvert integers and decimals to ordinary Chinese numerals or uppercase financial numerals.

RMB Amount in Chinese Financial NumeralsConvert a numeric RMB amount to uppercase Chinese financial text, including yuan, jiao, and fen.

Sensitive Text MaskerMask common phone, email, Chinese ID, and bank card patterns in text. Review the output manually before sharing.

Encoding

9 tools

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Text File Encoding ConverterDecode local text files and export UTF-8 with configurable BOM and line endings.

Unicode Escape ConverterEncode text as Unicode escape sequences or decode escaped Unicode characters back to readable text.

HTML Entity Encoder and DecoderConvert special characters to HTML entities or decode named and numeric character references into text.

Text to Binary ConverterConvert UTF-8 text to eight-bit binary byte sequences or decode binary bytes back to UTF-8 text.

Number Base ConverterConvert integers between binary, octal, decimal, hexadecimal, base 32, and base 36 representations.

Text to Hex ConverterEncode UTF-8 text as hexadecimal bytes or decode hexadecimal byte sequences to readable UTF-8 text.

Base32 Encoder and DecoderEncode text or decode Base32 data using the RFC 4648 alphabet and padding conventions.

Punycode Domain ConverterConvert internationalized domain names between Unicode and ASCII Punycode representations without querying DNS.

Legacy Escape Encoder and DecoderEncode or decode legacy percent escapes and percent-u Unicode sequences used by older JavaScript escape formats.

Web

30 tools

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URL ParserSplit a URL into protocol, hostname, port, path, query parameters, and fragment to inspect its structure locally.

URL Query String ConverterConvert URL query parameters to a JSON object or build a query string from JSON key-value pairs.

HTTP Header ParserConvert HTTP header lines to a JSON object or generate header text from JSON for request and response inspection.

Cookie Header ParserParse a Cookie request header into key-value data or generate a Cookie header from a JSON object.

Basic Auth Header GeneratorCreate a Basic Authorization header from a username and password or decode an existing header locally.

Chmod Permissions CalculatorConvert Unix file permissions between octal numbers and symbolic read, write, and execute notation.

IPv4 Subnet CalculatorCalculate network and broadcast addresses, subnet masks, and host ranges from an IPv4 address and CIDR prefix.

IPv4 to Integer ConverterConvert dotted-decimal IPv4 addresses to unsigned integers or convert integers back to IPv4 addresses.

IPv6 Expander and CompressorValidate IPv6 addresses and convert between expanded eight-group notation and compressed notation.

User-Agent ParserParse a User-Agent string to identify reported browser, operating system, device, and rendering engine details.

HTTP Status Code ReferenceLook up common HTTP status codes, their categories, names, and meanings for request troubleshooting.

MIME Type LookupLook up common MIME types by filename extension or search extensions associated with a content type.

Common Network Port ReferenceLook up common TCP and UDP port numbers and their usual protocol or service assignments.

Content Security Policy BuilderBuild a Content-Security-Policy header by configuring source lists and supported policy directives.

CORS Header BuilderGenerate CORS response headers from allowed origins, HTTP methods, request headers, and credential settings.

Cache-Control Header BuilderCombine cache visibility, freshness lifetime, and revalidation directives into a Cache-Control header.

Content-Disposition Header BuilderGenerate an inline or attachment Content-Disposition header with an encoded download filename.

DNS Record BuilderGenerate A, AAAA, CNAME, MX, TXT, and CAA record text from entered DNS settings without changing DNS records.

UTM BuilderBuild a tracking URL with source, medium, campaign, term, and content parameters.

JSON-LD Structured Data GeneratorGenerate Organization, Website, Article, Product, or FAQ JSON-LD.

hreflang GeneratorGenerate alternate hreflang tags for multiple localized URLs.

Canonical GeneratorGenerate a canonical URL and an optional mobile alternate tag.

HTML Head InspectorInspect title, description, canonical, viewport, and Open Graph metadata.

Redirect GeneratorGenerate redirect rules for Nginx, Netlify, Cloudflare, or Apache.

Open Graph Image GeneratorGenerate a 1200 by 630 Open Graph social image in your browser.

CSS Clamp GeneratorGenerate a fluid CSS clamp expression from font and viewport ranges.

CSS Shadow GeneratorBuild a box-shadow from offset, blur, spread, color, and inset settings.

CSS Gradient GeneratorGenerate a linear gradient from angle, color, and position settings.

CSS Grid GeneratorGenerate fixed-column or automatically responsive CSS Grid layouts.

CSS Media Query GeneratorGenerate CSS media queries from a named breakpoint list.

Date and time

11 tools

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Date and Time Difference CalculatorCalculate the elapsed days, hours, minutes, and seconds between two dates and times.

Date Addition and SubtractionAdd or subtract years, months, days, hours, or minutes from a date and inspect the resulting date and time.

Time Zone ConverterConvert a date and time between supported IANA time zones and compare the corresponding local times.

Week CalculatorFind a date's ISO week number, weekday, and day of the year using ISO week-date conventions.

Age CalculatorCalculate completed years and elapsed years, months, and days between a birth date and a target date.

Business Day CalculatorCount weekdays between two dates, with optional custom excluded dates and inclusive endpoints. Holiday calendars are not loaded automatically.

Duration ConverterConvert supported ISO 8601 duration strings to readable durations or parse readable durations into ISO notation.

Leap Year CheckerCheck whether a year is a leap year and view the number of days in that year.

Days in a Month CalculatorFind the number of days in a selected month and the weekdays of its first and last days.

Calendar Quarter CalculatorFind the calendar quarter containing a date and display that quarter's start and end dates.

Date Sequence GeneratorGenerate consecutive dates with a chosen daily, weekly, monthly, or yearly step and number of entries.

Randomizers

6 tools

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Random Integer GeneratorGenerate random integers within a chosen range using the browser's cryptographic random source.

Random Name and List PickerPick one or more random entries from a pasted candidate list for selections and draws.

Random Group GeneratorSplit a list of participants randomly into groups with sizes kept as even as possible.

Dice RollerRoll a chosen number of virtual dice with a configurable number of sides and view the total.

Coin Flip SimulatorSimulate one or more coin flips and count heads and tails using browser-generated random outcomes.

Random List ShufflerShuffle the order of a line-separated list using browser cryptographic randomness, then copy the reordered entries.

Format and validation

20 tools

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XML FormatterValidate XML syntax and format or minify an XML document for inspection and exchange.

XML / JSON ConverterConvert XML to JSON or JSON to XML while representing attributes and text nodes explicitly.

TOML / JSON ConverterConvert TOML configuration to JSON or serialize compatible JSON data as TOML.

INI / JSON ConverterConvert INI sections and key-value settings to JSON or generate an INI configuration from JSON.

Java Properties / JSON ConverterConvert Java Properties key-value configuration to JSON or generate Properties text from a JSON object.

JSON Lines / JSON ConverterConvert newline-delimited JSON records to a JSON array or split an array into JSON Lines records.

JSONPath Query ToolQuery a JSON document with a JSONPath expression and view the matching values and nodes.

JSON Pointer Query ToolLocate a JSON value using an RFC 6901 JSON Pointer, including escaped slashes and tildes in property names.

JSON FlattenerFlatten nested JSON objects into dot-path key-value pairs for easier inspection or tabular processing.

JSON UnflattenerRebuild nested JSON objects from flat dot-path keys and their associated values.

JSON Key SorterSort object keys recursively throughout a JSON document while preserving the order of array elements.

JSON Object MergerMerge two JSON objects recursively and choose how arrays are combined in the resulting document.

JSON Schema ValidatorValidate JSON data against a JSON Schema and inspect validation errors with their data paths.

JSON to TypeScript InterfacesGenerate TypeScript interfaces from sample JSON data to create a starting point for application types.

JSON to Go StructGenerate Go struct definitions with json tags from sample JSON objects and arrays.

JSON to Markdown TableConvert an array of JSON objects into a Markdown table with columns based on object properties.

CSV to Markdown TableConvert CSV headers and records into an aligned Markdown table for documentation and reports.

CSV to SQL INSERT GeneratorGenerate SQL INSERT statements from CSV headers and rows for a selected table. Statements are not executed.

HTML Table to JSON ConverterExtract headers and row values from an HTML table and represent the table as JSON records.

GraphQL FormatterParse and format GraphQL queries or schema definitions to standardize their layout without making API requests.

Unit conversion

30 tools

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Length ConverterConvert lengths between meters, kilometers, miles, feet, inches, and nautical miles.

Area ConverterConvert areas between square meters, hectares, square kilometers, Chinese mu, and acres.

Volume ConverterConvert volumes between liters, milliliters, cubic meters, gallons, and fluid ounces.

Mass and Weight ConverterConvert mass between kilograms, grams, metric tonnes, pounds, and ounces.

Temperature ConverterConvert temperatures between Celsius, Fahrenheit, and Kelvin and inspect equivalent readings.

Speed ConverterConvert speeds between meters per second, kilometers per hour, miles per hour, and knots.

Time Unit ConverterConvert durations between milliseconds, seconds, minutes, hours, days, and weeks.

Data Size ConverterConvert bytes and decimal or binary storage units, including the distinction between KB and KiB.

Angle ConverterConvert angular measurements between degrees, radians, gradians, and complete turns.

Pressure ConverterConvert pressure between pascals, kilopascals, bars, standard atmospheres, and PSI.

Energy ConverterConvert energy between joules, kilowatt-hours, calories, and British thermal units.

Power ConverterConvert power between watts, kilowatts, megawatts, and mechanical horsepower.

Force ConverterConvert force between newtons, kilonewtons, pound-force, and kilogram-force.

Torque ConverterConvert torque between newton-meters, pound-feet, and kilogram-force meters.

Frequency ConverterConvert frequency between hertz, kilohertz, megahertz, gigahertz, and revolutions per minute.

Density ConverterConvert density between kilograms per cubic meter, grams per cubic centimeter, and pounds per cubic foot.

Volume Flow Rate ConverterConvert volume flow between liters per second, liters per minute, cubic meters per hour, and gallons per minute.

Fuel Economy ConverterConvert fuel consumption between liters per 100 km, kilometers per liter, and US or Imperial miles per gallon.

Acceleration ConverterConvert acceleration between meters per second squared, standard gravity, and feet per second squared.

Typography Unit ConverterConvert px, rem, pt, and pica values using a configurable root font size for relative units.

Illuminance ConverterConvert illuminance between lux, phot, and foot-candles to compare lighting measurements.

Electric Current ConverterConvert electric current between amperes, milliamperes, microamperes, and other supported units.

Voltage ConverterConvert electrical potential between volts, millivolts, kilovolts, and other supported voltage units.

Electrical Resistance ConverterConvert electrical resistance between ohms, kilohms, megohms, and other supported units.

Capacitance ConverterConvert capacitance between farads, millifarads, microfarads, nanofarads, and picofarads.

Inductance ConverterConvert inductance between henries, millihenries, microhenries, and other supported units.

Magnetic Flux Density ConverterConvert magnetic flux density between tesla, millitesla, microtesla, and gauss.

Data Transfer Rate ConverterConvert network and file transfer rates between bits per second, bytes per second, and their multiples.

Dynamic Viscosity ConverterConvert dynamic viscosity between pascal-seconds, centipoise, and pounds per foot-second.

Radioactive Activity ConverterConvert radioactive activity between becquerels, kilobecquerels, and curies using fixed unit factors.

Calculators

32 tools

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Percentage CalculatorCalculate a percentage of a number or find what percentage one value represents of another.

Percentage Change CalculatorCalculate the percentage increase or decrease from an original value to a new value.

Ratio SimplifierReduce the ratio of two integers to its simplest form by dividing both sides by their greatest common divisor.

Fraction SimplifierReduce an integer fraction and display its decimal value and mixed-number representation.

Descriptive Statistics CalculatorCalculate count, sum, mean, median, mode, minimum, and maximum for a list of numerical observations.

Standard Deviation CalculatorCalculate population and sample variance and standard deviation from a list of numbers.

Quartile CalculatorCalculate the minimum, first quartile, median, third quartile, and maximum of a numerical dataset.

Permutation and Combination CalculatorCalculate exact integer values for permutations nPr and combinations nCr from n and r.

Prime Checker and FactorizationCheck whether an integer is prime and display its prime factorization.

GCD and LCM CalculatorFind the greatest common divisor and least common multiple of two or more integers.

Modulo CalculatorCalculate remainders, normalized modulo values, and modular exponentiation for integer inputs.

Quadratic Equation SolverSolve ax² + bx + c = 0 from its coefficients and display real or complex roots.

Two-Variable Linear Equation SolverSolve a system of two linear equations in two unknowns using the supplied coefficients and constants.

2×2 Matrix CalculatorCalculate determinants, inverses, sums, and products of two-by-two matrices.

2D Vector CalculatorCalculate vector lengths, addition, dot products, angles, and the scalar cross product of two-dimensional vectors.

Complex Number CalculatorAdd, subtract, multiply, or divide two complex numbers entered as real and imaginary parts.

Roman Numeral ConverterConvert positive integers to standard Roman numerals or convert valid Roman numeral text to decimal integers.

Scientific Notation ConverterConvert a number between ordinary decimal display and scientific notation with configurable significant digits.

Bitwise CalculatorCalculate AND, OR, XOR, NOT, and bit shifts for numerical inputs and inspect the resulting values.

IEEE 754 Floating-Point InspectorInspect the sign, exponent, and mantissa bits of 32-bit and 64-bit IEEE 754 floating-point numbers.

Significant Figures CalculatorRound a number to a selected number of significant figures and inspect the resulting representation.

Arithmetic and Geometric Sequence GeneratorGenerate arithmetic or geometric sequences from initial values and steps or ratios, and calculate their sums.

Fibonacci Sequence GeneratorGenerate a chosen number of Fibonacci terms or look up the value of a specified term.

Circle CalculatorCalculate a circle's diameter, circumference, and area from its radius.

Triangle CalculatorCheck whether three side lengths form a triangle and calculate its perimeter and area.

Rectangle CalculatorCalculate a rectangle's area, perimeter, and diagonal from its width and height.

Regular Polygon CalculatorCalculate the perimeter and area of a regular polygon from its number of sides and side length.

Coordinate Distance CalculatorCalculate Euclidean distance, Manhattan distance, and the midpoint between two coordinate pairs.

Line Slope CalculatorFind the slope, intercept, and equation of a straight line through two points.

Compound Interest CalculatorEstimate a future balance from principal, fixed interest rate, duration, and compounding frequency.

Fixed-Rate Loan Payment CalculatorEstimate equal monthly payments, total interest, and total repayment for a fixed-rate amortizing loan.

Discount CalculatorCalculate a discounted price, the amount saved, and the effective discount percentage.

Generators

22 tools

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ULID GeneratorGenerate time-sortable ULID identifiers in batches using their standard 26-character representation.

Nano ID GeneratorGenerate compact random Nano ID identifiers with a selected length and batch size.

CUID2 GeneratorGenerate CUID2 identifiers in batches for application records and distributed identifier use cases.

MongoDB ObjectId GeneratorGenerate 24-character hexadecimal identifiers compatible with the MongoDB ObjectId format.

Random Hex GeneratorGenerate a chosen number of cryptographically random bytes as hexadecimal text with an optional 0x prefix.

Random IPv4 GeneratorGenerate sample IPv4 addresses from public, private, or unrestricted address ranges for test data.

Random IPv6 GeneratorGenerate sample IPv6 addresses in standard compressed notation for configuration examples and tests.

Random MAC Address GeneratorGenerate sample MAC addresses with unicast or locally administered address options.

Random Date GeneratorGenerate random dates within a selected start and end date range for sample datasets.

Fictional Person Data GeneratorGenerate fictional names and sample profile fields as JSON or CSV for test data and prototypes.

Username GeneratorCombine a keyword with random suffixes to generate username candidates in batches.

URL Slug GeneratorConvert a title to a lowercase, URL-friendly slug with normalized separators.

Semantic Version CalculatorCalculate the next semantic version from a current version and a major, minor, patch, or prerelease increment.

Plus-Address Email Alias GeneratorGenerate tagged email aliases for addresses whose provider supports plus addressing.

Text to Data URI GeneratorEncode text as a Data URI with a selected MIME type for embedding small text resources.

cURL Command BuilderBuild a cURL command from an HTTP method, URL, headers, and body without sending the request.

robots.txt GeneratorGenerate robots.txt directives from user-agent names, allowed and disallowed paths, and a sitemap URL.

XML Sitemap GeneratorTurn a list of page URLs into an XML sitemap that can be reviewed and published on your website.

Web App Manifest GeneratorGenerate a PWA manifest with an app name, theme colors, start URL, and display settings.

HTML Meta Tag GeneratorGenerate HTML title, description, canonical, and robots tags from your page details.

Open Graph Tag GeneratorGenerate Open Graph metadata for a page's title, description, URL, and social sharing image.

ICS Calendar Event GeneratorCreate an iCalendar event file from an event title, start and end times, location, and description.

Documents and files

17 tools

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PDF OrganizerMerge PDFs and reorder, rotate, or remove pages locally.

PDF SplitterSplit a PDF into one or more custom page ranges.

Images to PDF ConverterCombine JPEG, PNG, or WebP images into a PDF.

PDF to Image ConverterRender every PDF page as a PNG or JPEG image.

PDF WatermarkAdd a locally generated text watermark to every PDF page.

PDF Page NumbersAdd sequential page numbers at the top or bottom of a PDF.

PDF Page CropperCrop the visible area of every PDF page using custom margins.

PDF MetadataInspect, edit, or remove PDF title, author, and producer metadata.

PDF Text ExtractorExtract an existing PDF text layer into page-by-page plain text. Scanned pages require OCR, which is not included.

ZIP Archive CreatorPackage multiple local files into a ZIP archive in your browser.

ZIP Archive ExtractorExtract a ZIP archive and download selected files locally. Extracted files are not scanned for malware.

Batch File RenamerRename files in batches with name, index, and extension templates.

File Checksum CalculatorCalculate SHA-256 or SHA-512 checksums for local files.

Duplicate File FinderFind exact duplicate files using SHA-256 content hashes.

File InspectorInspect file names, MIME types, extensions, sizes, and modification times.

File SplitterSplit a large file into fixed-size parts with a checksum manifest.

File JoinerJoin local file parts in natural filename order.

Spreadsheet data

13 tools

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Spreadsheet Data Quality CheckerCheck required values, duplicate keys, and column types in XLSX, CSV, TSV, or JSON data. Edit cells and export an issue report locally.

Spreadsheet ConverterConvert spreadsheet data between XLSX, CSV, TSV, and JSON.

Spreadsheet ViewerPreview, lightly edit, and export a spreadsheet without uploading it.

Table CleanerTrim whitespace and remove fully empty spreadsheet rows and columns.

Table DeduplicatorRemove duplicate rows using the entire row or selected key columns.

Table Column ManagerSelect, reorder, and rename spreadsheet columns in batches.

Table Filter SortFilter a spreadsheet column and sort text or numeric values.

Table SplitSplit one spreadsheet into multiple CSV files by distinct column values.

Table ConcatenateAlign multiple spreadsheets by column name and append their rows.

Table Join ToolRun an inner or left join across two spreadsheets using key columns.

Table Difference CheckerFind added, removed, and changed rows using a unique key.

Table SummarySummarize numeric columns with counts, sums, means, and ranges.

Pivot Table GeneratorGroup spreadsheet rows and calculate sums, averages, or counts.