Generate a unique URL to easily test, receive and inspect HTTP webhooks in real-time. View request headers, query parameters, JSON payloads, and more.
Calculate your exact age in years, months, days, hours, and minutes. Find your zodiac sign, day of birth, and countdown to next birthday.
Estimate your personalized autophagy onset based on hours fasted, experience level, age, and exercise. See your current fasting phase, milestone tracker, and tips to accelerate cellular repair.
Estimate your blood alcohol content (BAC) using the Widmark equation. Enter weight, gender, drinks consumed, and time elapsed to calculate current BAC level, impairment status, and time to sober up.
Find out your biological age based on 7 key lifestyle factors: BMI, exercise, sleep, smoking, diet, stress, and alcohol. Compare to your chronological age and get a personalised factor breakdown.
Guided breathing exercises with animated visual cues. Practice Box Breathing, 4-7-8, Wim Hof, Deep Breathing, and Resonant Breathing with audio phase cues and session tracking.
Calculate Compound Annual Growth Rate (CAGR) for your investments. Find the annualized return rate between beginning and ending values over a time period.
Calculate your daily calorie needs based on age, gender, height, weight, and activity level. Get personalized targets for weight loss, maintenance, or muscle gain with macro breakdown.
Cat age calculator converts cat years to human years using the AAHA and AAFP feline guidelines, and reports the matching life stage. Free, runs in your browser.
Count characters, words, sentences, and paragraphs in real time. Check text against platform limits for Twitter, Instagram, YouTube, SEO meta tags, SMS, and Google Ads.
Discover your chronotype with a 10-question quiz based on Dr. Breus's sleep science framework. Get your ideal wake time, peak productivity window, best exercise time, and the perfect IF eating window for your biology.
Test how fast you can click with this free CPS (Clicks Per Second) test. Choose from 5s, 10s, 30s, or 60s durations and track your personal best click speed score.
Calculate compound interest on savings and investments. See how your money grows over time with monthly or yearly compounding and regular contributions.
Create countdown timers to any date or event. Track time remaining in days, hours, minutes, and seconds. Perfect for deadlines, events, and holidays.
Look up detailed information for any country worldwide - capital, population, area, currencies, languages, timezones, flag, and ISO codes instantly.
Look up detailed information about any country - capital, population, area, languages, currencies, timezones, and flag. Powered by the REST Countries API.
Cron next run calculator shows the exact times a cron expression fires next, in your local zone, UTC, or any IANA time zone, with DST gotchas flagged. Free, no signup.
Check live cryptocurrency prices for the top 500 coins by market cap. Displays real-time price, 24h change, market cap, and trading volume via the free CoinGecko API. Export data as JSON for developer workflows.
Interactive tool to learn and experiment with CSS Flexbox layouts. Visualize flex container and item properties in real-time.
CSS keyframe animation generator lets you build complex animations visually with real-time preview. Adjust timing, easing, and properties, then copy the code.
CSS keyframes generator builds @keyframes animations visually with live preview, easing curves, and duration control. Copy ready-to-use CSS. Free, no signup.
Build CSS transition declarations visually. Set property, duration, timing function, and delay, then preview the animation and copy the CSS.
Calculate the duration between two dates or add/subtract time periods from a date. Count workdays, weekends, and total days.
Calculate how many days are left until any future date or how many days have passed since a past date. Includes week and month approximations.
Discord timestamp generator builds every <t:epoch:style> tag at once, with a live relative preview, so each member sees the time in their own zone. Free, no login.
Dog age calculator converts dog years to human years using both the AVMA rule of thumb and the 2020 epigenetic formula, with life stage by breed size. Free, no signup.
Check a domain's registration date, estimated age, registrar, expiration timeline, and nameserver details with a quick RDAP lookup.
Estimate how long it takes to download a file based on your internet speed. Enter file size (MB/GB/TB) and connection speed (Mbps/Gbps) to get instant download time estimates.
View, edit, and remove hidden metadata in your photos (Exif data). Modify camera settings, location, and date information online.
Remove GPS location, camera model, timestamps, and all EXIF metadata from photos instantly in your browser. Batch process images and download clean files - nothing is uploaded to any server.
Generation calculator finds which generation a birth year falls in, from Baby Boomer to Gen Z and Gen Alpha, with the source for every date range. Free, no signup.
Calculate your 5 heart rate training zones using Fox, Tanaka, or Karvonen methods. Find your fat burning zone, aerobic zone, and max heart rate for optimized cardio workouts.
Calculate the number of hours and minutes between two times. Perfect for payroll, work hours, shift duration, and time tracking. Supports 12-hour and 24-hour formats with optional break deduction.
Generate HTTP Cache-Control headers with max-age, s-maxage, stale-while-revalidate, immutable, and more. CDN and browser caching strategies included. Free, browser-based.
Build Set-Cookie HTTP headers with all attributes - HttpOnly, Secure, SameSite, Path, Domain, Max-Age. Generate cookie headers for web development instantly. Free, no signup.
Test if any website supports HTTP/2 and HTTP/3 (QUIC) via real TLS ALPN negotiation. Shows TLS version, server headers, alt-svc advertisement, and response time.
Calculate how inflation has changed the purchasing power of money over time. Enter any amount and see its equivalent value in any year from 1960 to today using US CPI data.
Look up geolocation, ISP, timezone, and other information for any IP address. Find your public IP and trace IP locations instantly.
Instantly look up the geographic location, ISP, timezone, and network details for any IP address. Enter an IP or detect your own public IP with one click.
Check ISBN-10 and ISBN-13 codes to fetch book metadata including title, publisher, publication date, and page count - free, no signup.
ISO 8601 duration converter turns PT1H30M or P3DT4H5M6S into readable time, clock format and total seconds, and converts any number of seconds back into a valid duration.
Convert JSON sample data to Mongoose schema definitions for MongoDB instantly. Infers types, handles nested objects, ObjectIds, and Date fields. Free, browser-based, no signup.
Convert a JSON object to a Prisma schema model definition. Infers field types, detects IDs and timestamps automatically. Free, browser-based, no install needed.
Calculate the real cost of meetings based on attendees, duration, and average salary. See per-meeting, weekly, monthly, and annual cost breakdowns instantly.
Test your microphone online for free. See a real-time audio waveform, measure volume levels, and check your mic's sample rate and settings.
Numerology calculator finds your Life Path, Expression, Soul Urge and Personality numbers from your birth date and name, showing every reduction step. Free, no signup.
Free online guitar tuner that uses your microphone to detect pitch in real time. Shows note, cents deviation, and tuning needle. Works for guitar, bass, ukulele, and violin.
Free online metronome for musicians. Set tempo from 20 to 240 BPM, choose time signature (2/4, 3/4, 4/4, 6/8), and practice with click, wood block, or beep sounds. Includes tap tempo.
Free online stopwatch with lap tracking, split times, and millisecond precision. Start, stop, reset, and record laps instantly in your browser.
Calculate estimated ovulation date, fertile window, implantation window, and next period date from your cycle information.
Analyze password strength and security in real-time. Get detailed feedback on complexity, entropy, estimated crack time, and suggestions for improvement.
PDF metadata viewer shows page count, title, author, creation and modified dates straight from the file, all inside your browser. Free, no signup, no upload.
Test HTTP latency to a public website with repeated ping attempts, average response time, jitter, and request-failure tracking.
Boost your productivity with the Pomodoro Technique. Customizable work and break intervals, session tracking, audio notifications, and focus statistics.
Calculate your estimated due date based on your last menstrual period, conception date, IVF transfer, or ultrasound. Track pregnancy progress with trimester timeline and milestones.
Calculate your optimal daily protein intake based on weight, fitness goal, activity level, and age. Covers goals from RDA minimum to muscle building and athletic performance, with per-meal breakdown.
Generate random inspirational and programming quotes from famous thinkers, developers, and innovators. Get 5 quotes at a time with next/previous navigation and JSON export for apps, bots, or content pipelines.
Calculate how long it takes to read any text at different reading speeds. Paste text or enter word count to get reading and speaking time estimates.
Test regular expressions with real-time validation, match highlighting, and detailed explanations. Debug regex patterns quickly and efficiently.
Plan your retirement with this free calculator. Enter your age, savings, monthly contributions, and expected return to see your projected nest egg and monthly income at retirement.
Convert numbers to Roman numerals and Roman numerals to numbers instantly. Supports values from 1 to 3,999 with real-time conversion and a handy reference chart.
Calculate running pace, finish time, or distance for any race. Supports 5K, 10K, half marathon, marathon and custom distances. Includes split tables and equivalent race time predictions.
Compile SCSS and Sass to clean CSS instantly in your browser. Supports variables, nesting, mixins, and imports with real-time preview and formatted output.
Calculate returns on Systematic Investment Plan (SIP). See how monthly investments grow over time with expected returns, total invested amount, and wealth gained.
Calculate the best bedtime or wake-up time based on 90-minute sleep cycles. Find out when to sleep or wake up to feel fully rested and avoid grogginess.
Decode Discord, Twitter/X, and Instagram snowflake IDs into timestamps and worker IDs instantly in your browser. Free, no signup, bulk decoding supported.
Real-time character counter for Twitter/X, Instagram, LinkedIn, TikTok, Threads, Pinterest, and YouTube with platform-specific limits.
Spin a customizable random wheel to make decisions, pick winners, or choose what to eat. Add up to 20 options with animated spinner. Fair and random every time.
Convert SubRip SRT subtitles to WebVTT format instantly in the browser with timestamp normalization and optional cue number cleanup.
Check SSL certificate details for any domain - expiry date, issuer, Subject Alternative Names, TLS version, and fingerprint. Instantly verify if a certificate is valid, trusted, and how many days remain before it expires.
Convert times between any time zones worldwide. Features a live world clock, quick reference for popular zones, and daylight saving time support.
Find the IANA timezone, current local time, and UTC offset for any city worldwide - live clock updates every second, no install needed.
Test your typing speed and accuracy with this free online typing test. Measure Words Per Minute (WPM), Characters Per Minute (CPM), and accuracy with real-time feedback.
Free Unix timestamp converter to convert epoch time to date and date to timestamp. Support for seconds, milliseconds, and multiple timezones.
UUID decoder identifies the version and variant of any UUID and extracts the creation timestamp from v1, v6 and v7 identifiers, plus clock sequence and node. Free and private.
Generate RFC-compatible UUID version 7 values with millisecond time ordering. Create single or bulk UUIDv7 values instantly in your browser.
Generate and download a simple WAV audio file online. Create a pure tone, test beep, white noise, or silence with custom frequency, duration, sample rate, and bit depth. Free, no signup.
Look up real-time weather conditions for any city worldwide. Get current temperature, humidity, wind speed, UV index, and sky conditions using the free Open-Meteo API. No API key required.
Take a picture with your webcam in the browser. Countdown timer for self-portraits, instant PNG download. Nothing is uploaded, 100% private.
Check if a website is down for everyone or just you. Test website availability, status code, DNS resolution, and response time from an independent server.
WebSocket tester connects to any ws:// or wss:// endpoint, sends messages, and logs responses in real time. Free, browser-based WebSocket client for debugging APIs.
Calculate exactly how long it will take to reach your goal weight. Uses TDEE and your preferred weekly deficit to project a goal date, daily calorie target, and milestone timeline.
Look up domain registration details including registrar, creation date, expiry date, nameservers, and status flags for any public domain.
Count words, characters, sentences, paragraphs and lines in your text. Analyze letter density and reading time instantly.
Track time across multiple cities and timezones simultaneously. Features real-time updates, DST support, day/night indicators, and time comparison table.
Twitter Card generator creates meta tags for Summary and Large Image cards with real-time preview. Optimize how your links appear on X - free and no signup.
Fetch and validate any XML sitemap - checks URL count, lastmod date format, changefreq values, priority range, and detects duplicate URLs. Supports sitemap index files.
Generate YouTube timestamp links that start at any time. Create shareable URLs and embed codes for videos instantly - free, no login required.
Zodiac sign calculator finds your sun sign from your birth date with its element, modality, ruling planet, compatible signs and Chinese zodiac animal. Free, no signup.