Citation Generator
Generate accurate citations in APA, MLA, Chicago, Harvard and IEEE from a DOI, PMID, ISBN, arXiv ID, BibTeX, RIS or reference text
Use Tool →Free Online Tools
A growing collection of practical utilities designed to help you get things done. Every tool runs in your browser: no uploads and no accounts. Analytics are anonymized and never include what you enter; the few tools that query public registries say so on their page. Built by engineers focused on accuracy, usability, and your privacy.
Citations
View all 5 →Reference Checker
Verify a pasted reference list against the scholarly registries
Use Tool →Paper Citation Checker
Cross-check in-text citations against the reference list, locally
Use Tool →Bibliography Generator
Manage and export your saved reference list in one place
Use Tool →Word & Character Counter
Count words, characters, sentences, and paragraphs in your text.
Use Tool →Cooking
View all 18 →Oven Temperature Converter
Convert between Fahrenheit, Celsius, and Gas Mark.
Use Tool →Cooking Unit Converter
Convert cups, tablespoons, teaspoons, ml, oz, and more.
Use Tool →Grams to Cups Converter
Free grams to cups converter — convert grams to cups, tablespoons, and teaspoons for 50+ baking ingredients using King Arthur and USDA density data.
Use Tool →Air Fryer Converter
Convert between oven and air fryer temperature and time with 30+ food presets.
Use Tool →Recipe Scaler
Scale any recipe instantly — paste ingredients, set servings, get adjusted quantities with clean fractions. Free, private, works offline.
Use Tool →Cooking Time Calculator
Calculate cooking time for meat and poultry by weight, cut, and doneness with USDA-verified temperatures.
Use Tool →Meat Temperature Guide
Interactive meat temperature chart with USDA safe temps, chef-preferred doneness, and pull temperature calculator.
Use Tool →Baker's Percentage Calculator
Calculate bread ingredient weights using baker's percentage where flour is always 100%.
Use Tool →Pan Size Converter
Convert recipes between different pan sizes and shapes by matching baking area and capacity.
Use Tool →Ingredient Substitution Finder
Find ingredient substitutes with dietary filters and quantity calculations for baking and cooking.
Use Tool →Pizza Dough Calculator
Calculate flour, water, salt, and yeast by pizza count, ball weight, and hydration. Supports 8 styles, 4 yeast types, and 4 fermentation schedules.
Use Tool →Crowd Food Calculator
Calculate food quantities per guest count for any event. Supports sit-down dinners, buffets, BBQs, and appetizer parties with 13 event presets and adjustments for kids, appetite, and duration.
Use Tool →Party Drinks & Ice Calculator
Work out how much beer, wine, spirits, soft drinks, and ice to buy for a party, with a shopping list and an optional budget.
Use Tool →Brine Calculator
Calculate salt, water, and brining times for wet brine, dry brine, and equilibrium brine. Supports 6 salt types, 14 proteins, and curing salt safety checks.
Use Tool →Food Cost Calculator
Calculate recipe food cost per serving with AP-to-EP yield factors, waste presets, pricing markup, and contribution margin for 10 business types.
Use Tool →Coffee Ratio Calculator
Calculate water-to-coffee ratio by brewing method with SCA Gold Cup references, grind size, bloom water, and brew temperature.
Use Tool →Nutrition Label Generator & Recipe Analyzer
Free nutrition label generator from any recipe — create FDA-compliant nutrition facts in 4 formats with macro breakdowns, daily value charts, and allergen detection.
Use Tool →Sourdough Hydration Calculator
Calculate sourdough hydration, baker's percentages, and ingredient weights with starter decomposition.
Use Tool →Decisions
View all 9 →Decision Tool Finder
Not sure which decision tool you need? Answer one question or explore the map to find the right one for your situation.
Use Tool →Core Values
Discover what matters most to you through guided exercises
Use Tool →Navigate
Explore ambiguous situations where you can't define your options yet. Map your resources, values, and unknowns with means inventory, values compass, landscape mapping, and safe-to-fail probes
Use Tool →Decide
Get clarity on hard decisions with 15 guided cognitive paths: weighted matrix, pre-mortem, inversion, values check, elimination, means inventory, affordable loss, 10/10/10 framework, and more
Use Tool →Decision Journal
Track your decisions and learn from outcomes over time
Use Tool →Commitment Tracker
Keep track of promises — yours and theirs
Use Tool →Expectation Tracker
Clarify what was understood after conversations
Use Tool →Assumptions Map
Surface, prioritize, and test the assumptions behind your decisions
Use Tool →Fact Base
Keep a trusted record of what you know — each fact saved with its source, date, and how sure you are.
Use Tool →Developer
View all 19 →JSON Formatter & Validator
Format, validate, and minify JSON with syntax highlighting.
Use Tool →Velvet MD - Markdown Beautifier
Transform markdown into beautifully styled documents with live preview and export to HTML, PDF, or DOCX.
Use Tool →Base64 Encoder/Decoder
Encode text or files to Base64, decode Base64 to text or files.
Use Tool →URL Encoder/Decoder
Encode special characters for URLs or decode percent-encoded strings.
Use Tool →Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text or files.
Use Tool →Regex Tester
Test regular expressions with live highlighting and match details.
Use Tool →Code Minifier
Minify JavaScript, CSS, and HTML to reduce file size.
Use Tool →Password Generator
Generate strong, random passwords with customizable options.
Use Tool →Random Number Generator
Generate random numbers, integers, or sequences within a custom range with no duplicates option.
Use Tool →JSON to CSV
Paste or upload JSON and instantly convert to CSV with automatic column flattening.
Use Tool →CSV to JSON
Paste or upload CSV and instantly convert to JSON with nested object support.
Use Tool →UUID Generator
Generate UUIDs (v4, v7, v1), ULIDs, and NanoIDs instantly.
Use Tool →Slug Generator
Convert text to URL-friendly slugs for SEO-optimized links and file names.
Use Tool →Color Converter
Convert colors between HEX, RGB, HSL, HSV, and CMYK formats instantly.
Use Tool →XML Formatter
Format, validate, and beautify XML with syntax highlighting.
Use Tool →YAML Formatter
Format, validate YAML, and convert between YAML and JSON.
Use Tool →Data Unit Converter
Convert between bytes, KB, MB, GB, TB, and PB with binary or decimal base.
Use Tool →Color Palette Generator
Generate beautiful color palettes with harmonies, Material Design tones, and export options.
Use Tool →Color Contrast Checker
Check and calculate WCAG contrast ratios between text and background colours for accessibility compliance.
Use Tool →Engineering
View all 21 →Decimal Feet Converter
Convert between feet-and-inches (with fractions) and decimal feet. Bidirectional with quick reference table.
Use Tool →Feet and Inches Calculator
Add, subtract, multiply, or divide feet and inches. Calculate rectangular area and perimeter or evaluate measurement expressions.
Use Tool →Box Fill Calculator
Calculate electrical box fill in cubic inches and check it against NEC 314.16 — conductors, clamps, devices, and grounds included.
Use Tool →Conduit Fill Calculator
Calculate conduit fill percentage and find the minimum conduit size for your conductors using NEC Chapter 9 tables.
Use Tool →Duct Size Calculator
Calculate HVAC duct dimensions from airflow (CFM). Supports round and rectangular ducts with velocity validation.
Use Tool →Duct System Planner
Free HVAC duct size calculator and system planner. Auto-size ducts by CFM from plenum to registers, calculate friction loss and total pressure drop per ASHRAE and ACCA standards.
Use Tool →Dwelling Load Calculator
Calculate a single-family dwelling service load and the minimum service size using the NEC Article 220 standard and optional methods.
Use Tool →Electric Motor Sizing Calculator
Torque, speed and power a motor must provide for a real load — with gearing, motion cycles and candidate checks.
Use Tool →Heat Load Calculator
Calculate residential heating and cooling loads room by room. Simplified Manual J methodology with ASHRAE design temperatures.
Use Tool →HVAC Cost Comparison Calculator
Compare annual heating and cooling costs across six HVAC system types. Uses degree-day analysis with real energy prices to find the most affordable and greenest option.
Use Tool →HVAC Repair vs Replace Calculator
Should you repair or replace your HVAC system? Uses the 50% Rule, Rule of 5,000, and ASHRAE lifespan data to give you a clear, data-driven recommendation.
Use Tool →HVAC Sizing Calculator
Calculate the right AC, furnace, or heat pump size for your home. Uses ACCA Manual S sizing limits with standard equipment capacities.
Use Tool →Insulation R-Value Calculator
Calculate insulation R-value for wall assemblies, attics, and floors. Check IECC 2021 code compliance by climate zone.
Use Tool →Mini Split Sizing Calculator
Calculate the right ductless mini split size for each room based on area, insulation, climate zone, and room type.
Use Tool →Psychrometric Calculator
Calculate every moist-air property — dew point, wet bulb, relative humidity, humidity ratio, enthalpy — from any two, with an interactive psychrometric chart.
Use Tool →Refrigerant Charge Calculator
Calculate superheat, subcooling, and look up pressure-temperature values for 15 common refrigerants. Diagnose charge issues for TXV and fixed orifice systems.
Use Tool →Register Size Calculator
Find supply register, return grille, and filter grille sizes for any CFM, with face velocity checked against ACCA Manual D guidance.
Use Tool →Room Airflow Calculator
Calculate CFM airflow requirements and register sizes for each room. Uses ASHRAE 62.2 ventilation rates and load-based airflow calculations.
Use Tool →Transformer Calculator
Calculate rated secondary current, ideal voltage and turns ratios, and the kVA rating a load needs, for single-phase and three-phase transformers.
Use Tool →Voltage Drop Calculator
Calculate voltage drop and select optimal wire sizes for electrical circuits. Supports NEC, IEC, and BS 7671 standards with ampacity derating.
Use Tool →Wire Size & Ampacity Calculator
Find the correct wire size and circuit breaker for any load, or the ampacity of a conductor, using NEC termination and derating rules.
Use Tool →Health & Fitness
View all 6 →BMI Calculator
Calculate your Body Mass Index and check if your weight is in a healthy range.
Use Tool →Calorie Calculator
Calculate your daily calorie needs (TDEE) based on age, gender, weight, height, and activity level.
Use Tool →Macro Calculator
Calculate your daily protein, carbs, and fat intake based on your calorie goals and preferred diet type.
Use Tool →Body Fat Calculator
Estimate your body fat percentage using the U.S. Navy method with simple body measurements.
Use Tool →Gestational Age Calculator
Calculate gestational age, estimated due date, and pregnancy milestones from your last menstrual period.
Use Tool →BAC Calculator
Estimate blood alcohol concentration with an honest uncertainty range, time until zero, and drink-drive limits for 32 countries
Use Tool →Image Tools
View all 14 →Bulk Barcode Generator
Generate barcodes in bulk. Supports Code 128, EAN-13, UPC-A, QR Code, Data Matrix, and 20+ formats. Export as PNG, SVG, PDF, or ZIP.
Use Tool →Color Palette Extractor
Extract dominant colors from any image. Get hex codes, RGB values, and create palettes.
Use Tool →Favicon Generator
Generate all favicon sizes from a single image. Complete favicon package for websites.
Use Tool →HEIC Converter
Convert iPhone HEIC/HEIF images to JPG or PNG format instantly.
Use Tool →Image Compressor
Reduce image file size while maintaining visual quality.
Use Tool →Image Converter
Convert images between PNG, JPG, WebP, GIF, and BMP formats instantly.
Use Tool →Image Cropper
Crop images with preset aspect ratios or custom selections.
Use Tool →Image Info
Quickly view image dimensions, file size, format, aspect ratio, and color information.
Use Tool →Image Metadata Viewer
View EXIF data, GPS location, and camera settings from your photos. Strip metadata for privacy.
Use Tool →Image Resizer
Resize images to exact dimensions or percentages with quality control.
Use Tool →Image Watermark
Batch watermark photos with text, logos, tiling, 18 fonts, and ZIP download
Use Tool →Placeholder Image Generator
Create custom placeholder images with specific dimensions and colors for mockups.
Use Tool →QR Code Generator
Generate QR codes for URLs, text, WiFi, contacts, and more. Download as PNG or SVG.
Use Tool →Spectra Image Generator
Generate royalty-free images with 237 generative art styles. Perfect for backgrounds, placeholders, and creative projects.
Use Tool →Learning
View all 12 →Pattern Recognition
Solve visual matrix, sequence, analogy, and odd-one-out puzzles
Use Tool →Spatial Reasoning
Visualize rotations, reflections, and 3D transformations
Use Tool →Number Sequences
Find the next number in the sequence by identifying the pattern
Use Tool →Numerical Reasoning
Solve word problems with percentages, ratios, and rates
Use Tool →Data Interpretation
Analyze charts and graphs to answer data questions
Use Tool →Critical Thinking
Evaluate arguments, identify hidden assumptions, and spot logical flaws. Practice critical reasoning for aptitude tests and professional decision-making.
Use Tool →Logical Deduction
Draw valid conclusions from logical premises. Solve seating, grouping, and ordering puzzles by applying every constraint.
Use Tool →Verbal Reasoning
Master word analogies, odd-word-out, and verbal relationships. Practice vocabulary-based reasoning for aptitude tests and exams.
Use Tool →Error Checking
Spot differences between data sets quickly and accurately
Use Tool →Coding & Decoding
Translate messages using coding rules and patterns
Use Tool →Rhythm Trainer
Diagnose and train your sense of rhythm — beat, inner pulse, subdivision, and imitation — with millisecond timing feedback.
Use Tool →Ear Pitch Trainer
Ear training tool: hear a target note, sing or play it back, and get real-time pitch accuracy feedback.
Use Tool →Math
View all 8 →Arithmetic Calculator
Powerful calculator with basic, advanced, and scientific modes.
Use Tool →Percentage Calculator
Calculate percentages, percentage change, and more.
Use Tool →Grade Calculator
Calculate grades, weighted averages, final exam scores, and grade curves instantly.
Use Tool →GPA Calculator
Calculate your GPA from course grades and credits.
Use Tool →Unit Converter
Convert length, weight, temperature, area, and speed units.
Use Tool →Tip Calculator
Calculate tips by percentage, split bills for groups up to 100, and see per-person totals.
Use Tool →Coin Flip
Flip a virtual coin with 3D animation, cryptographic randomness, multi-coin mode, and session statistics.
Use Tool →Unit Circle Reference
Interactive unit circle with all 16 special angles, exact trigonometric values, and reference triangles.
Use Tool →Music
View all 18 →Metronome
Free online metronome with subdivisions, speed trainer, tap tempo, and 6 time signatures.
Use Tool →BPM Tapper
Tap along to any song to detect its BPM — with real-time averaging and tap history.
Use Tool →Rhythm Trainer
Diagnose and train your sense of rhythm — beat, inner pulse, subdivision, and imitation — with millisecond timing feedback.
Use Tool →Instrument Tuner
Tune your guitar (6/7/12-string), bass (4/5/6-string), ukulele, violin, mandolin, or banjo with 37 tunings and auto-detected strings.
Use Tool →Online Tone Generator
Free online tone generator and sine wave generator. Play pure tones from 20 Hz to 20 kHz at 0.01 Hz precision, with five waveforms, noise types, sweep and WAV export.
Use Tool →Chord Chart
View chord diagrams for guitar and piano with audio playback.
Use Tool →Ear Pitch Trainer
Ear training tool: hear a target note, sing or play it back, and get real-time pitch accuracy feedback.
Use Tool →Can You Hear This?
Discover how high you can hear with this interactive frequency challenge.
Use Tool →Speaker Test
Test your speakers or headphones right in your browser: check left and right channels, stereo balance, bass, full-range sweeps, and speaker polarity.
Use Tool →Voice Recorder
Record from your microphone in the browser — trim, add echo or reverb, and download WAV, MP3, WebM, Opus, or M4A when available.
Use Tool →Sound Level Meter
Measure relative sound levels live from your microphone, with A/Z weighting and Fast/Slow response.
Use Tool →Mains Hum & Ground Loop Tester
Identify electrical hum and ground-loop noise: play a reference 50 or 60 Hz mains hum or buzz and match it by ear against the sound in your system.
Use Tool →DTMF Tone Generator
Free DTMF tone generator with frequency reference table. Play all 16 touch-tone signals (697–1633 Hz), dial sequences, export WAV files, and generate telecom tones.
Use Tool →Binaural Beats Generator
Create binaural beats for sleep, relaxation, focus, and meditation with adjustable frequencies and session timer.
Use Tool →Noise Machine
Free noise generator — mix white, pink, brown, blue, and violet noise for sleep, focus, or relaxation with per-channel volume and timer.
Use Tool →Virtual Piano
Play piano and 5 other instruments in your browser with keyboard, mouse, or touch input and HD sound
Use Tool →Soundscape Generator
Free ambient sound mixer — layer rain, wind, fire, birds, thunder and 100+ procedural sounds with real-time synthesis. 20 presets with Subtle/Balanced/Rich moods, per-layer mixing, and audio-reactive visualizations.
Use Tool →Note Frequency Calculator
Convert between musical notes and frequencies in hertz, with MIDI numbers, wavelengths, an adjustable concert pitch, and a full C0-B8 chart.
Use Tool →PDF Tools
View all 11 →PDF Editor
Edit, merge, split, rotate, and organize PDF pages online.
Use Tool →Merge PDF
Combine multiple PDF files into a single document.
Use Tool →Split PDF
Extract specific pages or split a PDF into multiple files — privately in your browser.
Use Tool →Crop PDF
Visually select and crop a region from PDF pages — trim margins or extract areas, privately in your browser.
Use Tool →Compress PDF
Reduce PDF file size with adjustable quality settings — all compression runs in your browser.
Use Tool →PDF to Images
Convert PDF pages to high-resolution PNG or JPEG images — all processing in your browser.
Use Tool →Images to PDF
Combine JPG, PNG, or WebP images into a single PDF — privately in your browser.
Use Tool →Rotate PDF
Rotate individual or all PDF pages by 90° or 180° — no upload required.
Use Tool →Add Page Numbers
Add page numbers to PDFs with custom position, font, and starting number options.
Use Tool →Sign PDF
Draw, type, or upload signatures onto PDF documents — your files never leave the browser.
Use Tool →PDF to Text
Extract text from PDF files to TXT, JSON, or DOCX.
Use Tool →Printables
View all 5 →Paper Generator
9 paper types: graph, dot, ruled, Cornell, isometric, hex, polar, log, and time-block — instant PDF
Use Tool →Calendar Maker
Create custom printable calendars with events, images, and color themes — export as PDF.
Use Tool →Music Paper
6 music paper types: staff, grand staff, staff + tab, guitar tab, chord charts, and percussion — custom sizes, instant PDF
Use Tool →Coloring Pages
90+ coloring page styles: mandalas, Celtic knots, fractals, geometric tiles, and nature patterns — PDF download
Use Tool →Craft Pattern Paper
Generate printable grids for cross stitch, knitting, calligraphy, and embroidery
Use Tool →Text
View all 4 →Word & Character Counter
Count words, characters, sentences, and paragraphs in your text.
Use Tool →Case Converter
Convert text between UPPERCASE, lowercase, Title Case, and more.
Use Tool →InnoviCat Lorem
Generate placeholder text with 26 generators, 7 output types, and vocabulary statistics.
Use Tool →Text Diff & Compare
Compare two texts side by side and highlight additions, deletions, and changes instantly.
Use Tool →Time
View all 6 →World Clock
View current time in 400+ cities with accurate day/night indicator and sorting options.
Use Tool →Time Zone Converter
Find the time difference between any two cities. Convert times across 600+ cities using the IANA time zone database with DST handling, UTC offsets, and a meeting planner.
Use Tool →Unix Timestamp Converter
Convert between Unix timestamps and human-readable dates.
Use Tool →Time Calculator
Add, subtract, multiply, and divide hours, minutes, and seconds easily.
Use Tool →Age Calculator
Calculate exact age from birthdate in years, months, and days.
Use Tool →Pet Age Calculator
Convert your pet's age to human years using veterinary science — dogs (by size), cats, rabbits, ferrets, guinea pigs and hamsters.
Use Tool →Timers
View all 7 →Pomodoro Timer
Focus timer with 25-minute work sessions and break intervals.
Use Tool →Visual Timer
See time run out with color-coded countdown. 4 modes: circle, bar, sand, text. Fullscreen, classroom presets, keyboard shortcuts.
Use Tool →Meeting Timer
Run your agenda item by item and see where the meeting time actually went.
Use Tool →Interval Timer
Customizable interval training timer for HIIT and workouts.
Use Tool →Stopwatch
Measure elapsed time with lap functionality and millisecond accuracy.
Use Tool →Breathing Timer
Guided breathing exercises like Box Breathing and 4-7-8 for relaxation.
Use Tool →Event Countdown
Count down days, hours, and minutes to your special events.
Use Tool →Home Improvement Project
Calculate insulation, size HVAC systems, check wiring, and plan financing.
Prep Meals & Cook
Scale recipes, convert units, and calculate nutrition for any occasion.
Design for the Web
Build color palettes, check accessibility, and optimize images.
Focus & Unwind
Boost productivity with timers, then relax with ambient sounds.
Play & Practice Music
Generate tones, keep tempo, tune instruments, learn chords, and train your ear.
Prepare Documents
Merge, compress, and sign PDFs, then polish your text.
Study & Grades
Calculate grades and GPA, work out percentages, and study the unit circle.
Make Better Decisions
Weigh options, clarify values, and think through decisions before you commit.
Plan & Organize
Count down to events, calculate dates, and keep time on your side.
Print & Create
Design custom calendars, coloring pages, craft paper, and printable sheets.