Tools Docs
Understand each tool before you run it. The documentation is generated from the same registry as the tools themselves.
Internet Speed Test
Measure browser download speed, upload speed, and latency using a lightweight local test.
Internet & Network
What's My IP
Reveal your public IP and key browser details while keeping the process privacy-friendly.
Internet & Network
DNS Lookup
Inspect A, AAAA, MX, CNAME, TXT, NS, SOA, and CAA records for a domain.
Internet & Network
DNS Propagation Checker
Check whether a DNS change has propagated by comparing a record across 8 public resolvers and the domain's authoritative nameserver.
Internet & Network
Domain Checker
Check domain availability, status, and structure in a simple browser-based validator.
Website & Domain
HTTP Status Checker
Check the HTTP response for a URL and review the status, server, and redirect chain.
Website & Domain
Is My Website Down?
Test if a site is reachable and quickly review the response status and timing.
Website & Domain
Website Score
Measure a public website's SEO, performance, accessibility, security, and technical health.
Website & Domain
Website Speed Test
Test how fast a website loads: time to first byte, DNS, connection, TLS, download time, page size, compression, and render-blocking resources.
Website & Domain
Website Health Overview
Review the key status, performance, security, and SEO signals of a public website in one view.
Website & Domain
Headers Checker
Review HTTP response headers for caching, content type, security, and debugging information.
Website & Domain
SSL Checker
Check an SSL certificate's expiry date, issuer, covered hostnames, chain of trust, and TLS version for any domain.
Website & Domain
Ping
Measure the latency between your browser and a public endpoint using browser-friendly timing.
Internet & Network
Network Health Overview
Review your public connection quality in one view with IP detection, latency, and speed checks.
Internet & Network
Port Checker
Check whether a given host and port appear reachable from the browser environment.
Internet & Network
User Agent
Parse device, browser, and operating system details from the incoming user agent string.
Utilities
Color Converter
Convert colors between HEX, RGB, and HSL in real time.
Utilities
Developer Toolkit Overview
Review the most-used developer utilities for JSON, YAML, CSV, regex, timestamps, and build-time helpers in one dashboard.
Developer
JSON Formatter
Validate, format, minify, copy, and download JSON with a quick browser-based parser.
Developer
Base64
Encode and decode UTF-8 text directly in your browser.
Developer
Hash Generator
Create MD5, SHA-1, SHA-256, SHA-384, or SHA-512 checksums locally in your browser, and compare text digests with a published value.
Developer
Number Base Converter
Convert non-negative integers between binary, decimal, and hexadecimal.
Developer
JWT Decoder
Decode readable JWT headers and payloads locally without verifying signatures.
Developer
URL Encoder
Encode or decode URL strings and query parameter content securely in-browser.
Developer
Utility Toolkit Overview
Jump into the most popular browser-side utilities for PDFs, QR codes, passwords, image work, and everyday text tasks.
Utilities
QR Code Generator
Generate a customizable QR code from text or a URL and download it as PNG or SVG.
Utilities
Merge PDFs
Combine multiple PDF files into one document locally in your browser.
Utilities
Split PDF
Extract selected pages from a PDF into a new document locally.
Utilities
Remove PDF Pages
Remove selected pages from a PDF without uploading the file.
Utilities
Images to PDF
Combine PNG and JPEG images into a single PDF document locally.
Utilities
Text to PDF
Turn plain text into a simple downloadable PDF document in your browser.
Utilities
UUID Generator
Generate version 4 UUID strings using cryptographically secure randomness.
Developer
Password Generator
Create strong random passwords with adjustable length and symbol support.
Utilities
Case Converter
Convert text to upper, lower, title, camel, or snake case in your browser.
Utilities
Lorem Ipsum Generator
Generate placeholder paragraphs with adjustable paragraph and word counts.
Utilities
Date Difference
Calculate the exact difference between two dates and times.
Utilities
Timestamp Converter
Convert between Unix timestamps and human-readable dates in seconds or milliseconds.
Developer
Regex Tester
Test regular expressions against sample text to validate search and parse logic quickly.
Developer
Text Counter
Count characters, words, lines, sentences, and estimated reading time for any text block.
Utilities
Cron Job Maker
Generate cron expressions with presets, validation, and human-friendly explanations for common Linux and Unix schedules.
Developer
SVG to PNG Converter
Upload or paste SVG markup, preview it, adjust output size, and export a PNG locally in the browser.
Utilities
Image Resizer
Resize JPG, PNG, and WebP images locally with aspect-ratio locking, presets, and export-quality controls.
Utilities
YAML to JSON
Convert YAML into JSON with validation and instant browser-side output for API and config workflows.
Developer
JSON to YAML
Transform JSON into YAML for configuration files, deployments, and readable structured data.
Developer
CSV to JSON
Parse CSV data into structured JSON arrays and objects for quick app, API, and spreadsheet workflows.
Developer
JSON to CSV
Convert JSON arrays into CSV tables for easy import into spreadsheets and data tools.
Developer
XML Formatter
Pretty-print and validate XML with readable indentation, cleanup, and error feedback.
Developer
SQL Formatter
Format SQL statements with indentation, consistent spacing, and readable database query output.
Developer
Markdown Preview
Turn markdown into rendered HTML preview with simple formatting controls for writing and documentation checks.
Utilities
Text Diff
Compare two text blocks and highlight the exact additions, removals, and changes between versions.
Developer
URL Parser
Break down a URL into protocol, host, path, query parameters, hash, and other useful components.
Developer
Slug Generator
Create clean, URL-friendly slugs from titles and text for blogs, pages, and content management workflows.
Utilities
Line Ending Converter
Convert text between Unix, Windows, and Mac line endings without leaving the browser.
Utilities
HTML Escape / Unescape
Escape HTML special characters into entities or unescape entities back into raw HTML text.
Developer
ASCII / HEX Converter
Convert text to its hexadecimal byte representation, or decode hex back into readable ASCII text.
Developer
CSP Header Parser
Break a Content-Security-Policy header into its individual directives and sources for review.
Developer
CSS Gradient Generator
Build linear and radial CSS gradients visually and copy the generated background or text gradient code.
Developer
Box Shadow Generator
Design layered CSS box shadows with a live preview and copy the generated box-shadow declaration.
Developer
Border Radius Generator
Adjust each corner radius independently and copy the resulting CSS border-radius declaration.
Developer
Color Contrast Checker
Check the contrast ratio between two colors against WCAG AA and AAA accessibility thresholds.
Developer
UUID Validator
Check whether a value is a valid UUID and identify its version and variant.
Utilities
Credit Card Validator
Check a card number's Luhn checksum and identify its likely card network from the number pattern.
Utilities
ULID Generator
Generate sortable, timestamp-based ULID identifiers as an alternative to random UUIDs.
Utilities
Text Line Sorter
Sort lines of text alphabetically, numerically, by length, or in reverse, with duplicate removal.
Utilities
Duplicate Line Remover
Remove duplicate lines from a block of text while preserving the original order of first occurrences.
Utilities
Text Line Joiner
Join multiple lines of text into a single line using a comma, space, or custom delimiter.
Utilities
Text Splitter
Split text into separate lines using a delimiter such as a comma, space, or custom character.
Utilities
Golden Ratio Calculator
Calculate the complementary dimension of a layout using the golden ratio, approximately 1.618.
Utilities
Aspect Ratio Calculator
Calculate a missing width or height from a known aspect ratio, or find the ratio between two dimensions.
Utilities
PX / REM Calculator
Convert px to rem and rem to px with a configurable base font size, or switch to px to em for sizing relative to a parent font.
Utilities
YouTube Thumbnail Downloader
Get direct links to a YouTube video's thumbnail images in every available resolution.
Utilities
Heading Extractor
Fetch a public page and list its title, meta description, and H1–H6 heading structure in order.
Website & Domain
OGP Checker
Fetch a public page and review its Open Graph and Twitter/X card tags with a social preview.
Website & Domain
OGP Tag Generator
Generate Open Graph and Twitter/X meta tags from a title, description, image, and URL.
Developer
OGP Image Simulator
Preview how a title, description, and image will look as a shared social link card.
Developer
Image Compressor
Compress JPG and WebP images in your browser with a quality slider or approximate target size. Files never leave your device.
Utilities
HEIC to JPG
Convert HEIC and HEIF photos to JPG in batches without uploading them. Conversion runs locally in your browser.
Utilities
Image Format Converter
Convert image files between JPG, PNG, WebP, AVIF, GIF, BMP, and ICO in your browser. Your files stay on your device.
Utilities
EXIF Viewer
Inspect EXIF and other image metadata, then create a metadata-stripped copy locally. Your image is never uploaded.
Utilities
Image Palette Extractor
Sample an image in your browser to find its most frequent colors, then click a swatch to copy its HEX value.
Utilities
Image Cropper
Crop, rotate, and flip an image locally with percentage-based bounds. Your image is processed in the browser, never uploaded.
Utilities
Favicon Generator
Create 16px and 32px PNG favicons, a 180px Apple touch icon, and an ICO file from an image in your browser.
Utilities
SVG Optimizer
Optimize an SVG in your browser with SVGO, preview its markup, compare file sizes, and download the optimized vector.
Developer
Meme Generator
Add top and bottom captions to your own image and download a meme as PNG. Image editing happens entirely in your browser.
Utilities
Image to Text
Run browser-based OCR to extract text from an image, then copy or download the transcript. The image is never uploaded.
Utilities
PDF to Text
Extract selectable text from a PDF, view the result by page, and copy or download it locally. Your PDF is never uploaded.
Utilities
QR Code Scanner
Scan a QR code with your camera or decode a QR image in your browser. Camera frames and images are never uploaded.
Utilities
Age Calculator
Calculate age in years, months, and days, discover the weekday you were born, and see a countdown to your next birthday. Dates stay in your browser.
Utilities
Percentage Calculator
Find a percentage of a number, calculate percent change between two values, or work out a discounted price. Calculations stay in your browser.
Utilities
BMI Calculator
Estimate BMI, basal metabolic rate, and daily energy needs using metric or imperial measurements. Health calculations stay in your browser.
Utilities
Loan Calculator
Estimate a fixed-rate loan's monthly payment, full month-by-month amortization schedule, and total interest. Your inputs remain in your browser.
Utilities
Compound Interest Calculator
Project compound growth from an initial deposit, an annual rate, a term, and recurring monthly contributions. Values stay in your browser.
Utilities
Tip Calculator
Work out a tip, optional tax, the final bill, and each person's share when splitting a check. Bill values stay in your browser.
Utilities
GST/HST Calculator
Estimate combined Canadian sales tax by province or territory, add tax to a price, or remove tax from a tax-included total. Amounts stay local.
Utilities
Salary to Hourly Calculator
Convert annual, monthly, biweekly, semimonthly, or weekly pay into an hourly estimate, with weekly hours and overtime inputs. Pay values stay local.
Utilities
Unit Converter
Convert length, weight, temperature, volume, speed, and digital storage units with common cm-to-inch and kg-to-pound pairs preselected.
Utilities
Currency Converter
Convert between more than 150 currencies using the open.er-api.com exchange-rate feed. Only the requested currency code is sent for rates.
Utilities
Sleep Calculator
Estimate bedtime options for a target wake-up or wake-up times for a chosen bedtime using 90-minute cycles and time to fall asleep.
Utilities
Countdown Timer
Create a titled event countdown with days, hours, minutes, and seconds. Share one exact deadline across timezones through a link or social platform.
Utilities
Online Stopwatch
Run a browser stopwatch with pause, reset, lap times, and fullscreen mode. Timing remains on your device.
Utilities
Pomodoro Timer
Use customizable focus, short-break, and long-break intervals with a task label, optional sound, completed-session count, and a downloadable summary.
Utilities
Fraction Calculator
Add, subtract, multiply, or divide fractions, simplify the result, and see its decimal equivalent in your browser.
Utilities
Scientific Calculator
Evaluate typed arithmetic expressions with parentheses, powers, pi, e, and trigonometric and logarithmic functions. Calculations stay local.
Utilities
Statistics Calculator
Paste a list of numbers to calculate mean, median, mode, population standard deviation, and range locally in your browser.
Utilities
Business Days Calculator
Count weekdays between two dates, excluding weekends and an optional custom list of holiday dates. Date ranges stay in your browser.
Utilities
Microphone Test
Check microphone input level, choose an available device, and record a sample for playback. Audio stays in your browser and is never uploaded.
Utilities
Webcam Test
Preview your webcam, check its reported video resolution, and save a snapshot as PNG. Camera frames stay in your browser and are never uploaded.
Utilities
Speaker Test
Play separate left- and right-channel tones or a frequency sweep to check speaker output. Audio is generated locally in your browser.
Utilities
Keyboard Tester
Check held and detected keys on a visual keyboard, including navigation and numpad keys. Key codes remain in memory until reset or leaving the page.
Utilities
Typing Test
Take a 60-second typing test with rotating sample texts and see words per minute and character accuracy. Typed text remains in your browser.
Utilities
Reaction Time Test
Measure visual reaction time across five attempts and compare your average and best response. Timing is local to your browser.
Utilities
Screen Test
Cycle fullscreen solid colors to inspect a display for stuck or dead pixels. The test uses local browser rendering and sends no screen data.
Utilities
Subnet Calculator
Calculate an IPv4 subnet's network, broadcast, mask, host range, usable host count, and binary representation locally in your browser.
Developer
Schema Markup Generator
Generate JSON-LD for FAQ, HowTo, Article, LocalBusiness, Product, and Breadcrumb schemas. Structured data stays in your browser.
Developer
UTM Builder
Build a campaign URL with source, medium, campaign, term, and content parameters, plus presets and URL validation. Data stays in your browser.
Developer
SERP Preview
Preview a search result title, description, and URL with desktop and mobile layouts, and measure text pixel widths in your browser.
Developer
Robots.txt Generator
Build a robots.txt file with user-agent, allow, disallow, crawl-delay, and sitemap rules, then download it locally.
Developer
XML Sitemap Generator
Turn a pasted list of absolute URLs into XML sitemap entries with optional last-modified dates, change frequency, and priority.
Developer
TOTP Generator
Generate rolling six-digit authenticator codes from a Base32 shared secret using Web Crypto. Secret processing is fully client-side.
Developer
SSH Key Generator
Generate an RSA 2048-bit or ECDSA P-256 SSH key pair in your browser with an OpenSSH public key and PKCS#8 PEM private key.
Developer
CSR Decoder
Decode common subject fields and public-key and signature algorithms from a PEM certificate signing request in your browser.
Developer
File Hash Checker
Calculate MD5, SHA-1, SHA-256, and SHA-512 digests for local files using browser APIs and a local MD5 implementation. Files are not uploaded.
Developer
WebSocket Tester
Connect to a WebSocket endpoint you choose, send messages, and inspect live events in a browser log. Messages go only to that endpoint.
Developer
Text Encryptor
Encrypt and decrypt text locally with AES-256-GCM and a passphrase-derived key. Plaintext and passphrases are never uploaded.
Utilities
Wi-Fi QR Code Generator
Create a scannable QR code from an SSID, network security type, password, and hidden-network setting. Credentials stay in your browser.
Utilities
Barcode Generator
Generate Code 128, EAN-13, UPC-A, or Code 39 barcodes from text or digits, then download PNG or SVG locally.
Utilities
Text to Speech
Read text aloud with browser speech voices, adjustable rate and pitch, and optional voice selection. Text is passed to your browser's speech engine, not SiteIndex.
Utilities
Speech to Text
Dictate a live transcript with the browser Web Speech API, then copy or download the recognized text. Speech processing depends on browser support.
Utilities
Voice Recorder
Record microphone audio in your browser with a live input-level meter, then play or download the local recording.
Utilities
Fancy Text Generator
Convert plain Latin letters into decorative Unicode styles and copy each variant. Text conversion happens locally in your browser.
Utilities
ASCII Art Generator
Render a short phrase as monospaced FIGlet ASCII art using several font styles, then copy the text from your browser.
Utilities
Morse Code Translator
Translate letters and digits to International Morse code or decode Morse back to text, with optional browser-generated tone playback.
Utilities
Spin Wheel
Spin a wheel to choose a random name or option from an editable list. Your entries are saved in this browser's local storage.
Utilities
Random Number Generator
Generate cryptographically random integers from a range, draw unique numbers, roll configurable dice, or flip a coin locally.
Utilities
Invoice Generator
Create a simple invoice with line items, tax, and an optional local logo, then print or save it as PDF through your browser.
Utilities
Citation Generator
Draft starter APA, MLA, or Chicago citations for a book or web source from author, title, year, publisher, and URL fields.
Utilities
GPA Calculator
Calculate a credit-weighted GPA from course grades and credits, or estimate the GPA needed in upcoming courses to reach a target.
Utilities
Email Extractor
Extract and deduplicate email addresses, phone-like numbers, and URLs from pasted text, then export the matches as CSV locally.
Utilities
Readability Checker
Estimate English Flesch Reading Ease, Flesch-Kincaid grade level, word and sentence counts, and reading time locally.
Utilities
Chart Maker
Turn pasted CSV data into a bar, line, or pie chart and download the canvas as PNG without uploading the dataset.
Utilities
White Noise
Play locally generated white, pink, or brown noise through the Web Audio API with a volume control and optional sleep timer.
Utilities
Metronome
Set a 20–300 BPM tempo and time signature, tap to estimate a beat, and hear browser-generated metronome clicks.
Utilities
Love Calculator
Generate a playful, repeatable name-pair compatibility score for entertainment. The toy calculation runs locally and is not relationship advice.
Utilities
Magic 8 Ball
Ask a yes-or-no question and get a random classic-style 8-ball response, with optional device shake interaction. It is a toy, not advice.
Utilities
Mortgage Calculator
Estimate monthly mortgage principal, interest, property tax, and insurance with a fixed-rate calculation.
Utilities
EMI Calculator
Calculate a fixed equated monthly instalment, total interest, and total loan repayment.
Utilities
Sales Tax Calculator
Add sales tax to a price or reverse an inclusive total to find the price before tax.
Utilities
Retirement Calculator
Project retirement savings from contributions, assumed returns, and inflation, with a today-value comparison.
Utilities
ROI Calculator
Calculate investment gain or loss, total return on investment, and annualized return.
Utilities
Pregnancy Due Date Calculator
Estimate a pregnancy due date from the first day of your last period and usual cycle length.
Utilities
Ovulation Calculator
Explore an estimated ovulation date and fertile window using a regular-cycle calendar assumption.
Utilities
Ideal Weight Calculator
See the adult weight interval corresponding to BMI 18.5-24.9, without prescribing one ideal weight.
Utilities
Macro Calculator
Illustrate adult maintenance energy and a stated protein, carbohydrate, and fat split.
Utilities
Water Intake Calculator
Explore a rough weight-based adult daily fluid range with explicit health and hydration limitations.
Utilities
BAC Calculator
Explore an educational blood alcohol estimate and why a calculation cannot establish driving safety.
Utilities
Meta Tag Generator
Create escaped page title, description, canonical, robots, viewport, and optional author tags.
Developer
CSS Button Generator
Style a button with live colors, spacing, corners, hover, and keyboard focus, then copy CSS and HTML.
Developer
XML to JSON Converter
Convert XML to an ordered JSON representation retaining attributes, mixed content, and repeated elements.
Developer
cURL to Code Converter
Convert a cURL request into Python requests, JavaScript fetch, and PHP cURL examples in your browser.
Developer
JWT Signer
Sign JSON claims as a JWT with HMAC or an RS256 private key using browser cryptography.
Developer
OpenAPI Viewer
Inspect API operations and paths from an OpenAPI or Swagger document in JSON or YAML.
Developer
.gitignore Generator
Generate a starter .gitignore file from common Node, Python, Java, Go, and React presets.
Developer
CSS Specificity Calculator
Estimate the ID, class, attribute, pseudo-class, and element specificity of a CSS selector.
Developer
Code Screenshot Generator
Preview a code snippet and download it as a PNG image rendered in your browser.
Developer
README Generator
Draft a project README with a title, description, setup steps, usage section, and SPDX license reference.
Developer
License Notice Generator
Create an SPDX license notice for a project using common license identifiers.
Developer
Volume Converter
Convert litres, millilitres, cubic units, and explicitly labeled US and Imperial volumes.
Utilities
Length Converter
Convert metric lengths and international inches, feet, yards, and miles with instant results.
Utilities
Temperature Converter
Convert Celsius, Fahrenheit, and Kelvin with offset-aware formulas and absolute-zero validation.
Utilities
Weight Converter
Convert milligrams, grams, kilograms, ounces, pounds, and stones using standard mass definitions.
Utilities
Density Calculator
Calculate density from a measured mass and volume, with explicit units and SI results.
Utilities
Roman Numerals Converter
Convert whole numbers from 1 to 3999 into Roman numerals, or validate and decode Roman notation.
Utilities
Alarm Clock
Set a local browser alarm with a visual alert and optional sound while the page remains open.
Utilities
Calendar
View any Gregorian month from 1900 to 2199 with localized labels and Sunday-first weeks.
Utilities
Time Calculator
Add or subtract signed durations with hours, minutes, seconds, and optional milliseconds.
Utilities
World Clock
Compare live times and local dates across selected IANA time zones using your device clock.
Utilities
Grade Calculator
Calculate a weighted average from percentage scores and matching weights, with normalization shown.
Utilities
Concrete Calculator
Estimate rectangular slab volume, waste allowance, and whole bags from a manufacturer-specified yield.
Utilities
Roofing Calculator
Estimate simple pitched-roof surface area and roofing squares from a horizontal footprint and pitch.
Utilities
Square Footage Calculator
Calculate rectangle, triangle, or circle area in square feet and square metres with explicit dimensions.
Utilities
Slope Calculator
Calculate rise, run, line inclination, and distance between two points, including vertical-line handling.
Utilities
Standard Deviation Calculator
Compare population and sample standard deviation with variance, mean, and count for a numeric list.
Utilities
Significant Figures Calculator
Count significant figures using stated zero conventions and round decimal digits into explicit scientific notation.
Utilities
Long Division Calculator
Divide signed whole numbers exactly with quotient, remainder, and digit-by-digit absolute-value steps.
Utilities
Number to Words Converter
Spell signed decimals in English short-scale words while preserving individually spoken fractional digits.
Utilities
Force Calculator
Calculate one-dimensional Newtonian net force from mass and signed acceleration in SI units.
Utilities
Kinetic Energy Calculator
Calculate classical translational kinetic energy from mass in kilograms and velocity in metres per second.
Utilities
Velocity Calculator
Calculate average one-dimensional velocity from signed displacement and positive elapsed time.
Utilities
Running Pace Calculator
Calculate average elapsed pace per kilometre and mile plus speed from distance and duration.
Utilities
Dice Roller
Roll up to 100 custom-sided dice using browser cryptographic randomness with individual results and a total.
Utilities
Bra Size Calculator
Explore an approximate adult US/UK bra-fitting starting size from underbust and bust measurements.
Utilities