Tools Studio (124)
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Cycling Tools
3 toolsFixed Gear and Skid Patch Calculator
Fixed gear physics: calculate skid patches, gear inches, and optimize your rear tire wear for elite 400-600 word urban riding.
Bicycle Spoke Length Calculator
Absolute mechanical precision for your wheelbuilds: PCD, ERD, and cross patterns. Calculate the exact length for any hub and rim.
Bicycle Gear and Cadence Calculator
Precision drivetrain engineering: visualize gear overlaps, prevent cross-chaining, and optimize your pedaling with professional 400-600 word tools.
Pet Tools
2 toolsPet Age Calculator
Find out your dog or cat's real age in human years. Forget the multiply-by-7 rule. Use our calculator based on current veterinary science.
Pet Daily Ration Calculator
Calculate the exact amount of food your dog or cat needs. Tool based on veterinary RER and DER formulas for a healthy weight.
Alcohol and Party Utilities
5 toolsCocktail Balancer - The Sour Law
Calculate the perfect balance between sweet and sour for your cocktails. Master the golden ratio of mixology.
Beer Cooling Calculator with Newton's Law
Calculate with real thermodynamics — Newton's Law of Cooling — exactly how long your beer needs to reach the perfect serving temperature in the fridge or freezer.
Party Beer Calculator: Amount Per Person for Weddings & Birthdays
Free tool to calculate how much beer and ice you need based on guests, duration and temperature. Perfect for weddings, birthdays and outdoor events.
Beer Carbonation & Priming Calculator
Calculate the exact grams of Dextrose, Table Sugar or DME (Dry Malt Extract) for bottling your homebrew. Enter your volume, fermentation temperature and style for a perfect priming.
Hangover & BAC Calculator: Recovery Predictor
Calculate your Blood Alcohol Content (BAC) and time to reach 0.0 using Widmark's formula. Plan your pre-sleep hydration and know when you'll be fully recovered.
Astronomy Tools
4 toolsDark Sky Simulator (Bortle Scale)
Interactively visualize the 9 levels of the Bortle Scale and discover how light pollution erases the starry night sky.
Telescope Reach Calculator
Calculate the limiting magnitude of your telescope and discover which deep sky objects are visible with your equipment under your sky conditions.
500 Rule and NPF Astrophotography Calculator
Calculate the maximum exposure time for astrophotography without star trails. Classic 500 rule and high-precision NPF model for modern sensors.
Telescope Resolution Calculator (Dawes Limit)
Calculate the resolving power of your telescope with the Dawes Limit and Rayleigh Criterion. Discover the maximum useful magnification and the impact of atmospheric seeing.
Audiovisual and Photography Tools
10 toolsTimelapse and Hyperlapse Calculator: Perfect Intervals
Calculate the exact interval between photos, total duration, and storage for your timelapses. Essential tool for photographers.
EXIF Metadata Cleaner - Remove GPS and Hidden Data from Photos
Free online tool to erase EXIF metadata, GPS coordinates, and camera specs from your images before sharing. 100% private: works without uploading photos to the internet.
Synchronize SRT Subtitles Online - Adjust Timing for Free
Online tool to advance or delay SRT subtitles. Correct timing offset easily and download the synchronized file instantly.
Chromatic Lens - Online Color Palette Extraction
Extract professional color palettes from any image for free. Identify dominant colors in your photos using mathematical algorithms.
Print Quality Calculator - Pixels to CM and DPI
Calculate the maximum print size of your photos based on their resolution. Convert pixels to centimeters and inches to ensure professional printing.
TV Distance Calculator - THX and 4K Optimal Screen
Calculate the ideal distance to watch your television based on its size and resolution. Optimize your Home Cinema with THX and SMPTE standards.
Online Image Compressor - Reduce weight without losing quality
Optimize and compress your JPG, PNG, and WebP photos for free. Reduce file size to improve your web loading speed locally.
Online Collage Maker - Design professional compositions
Create photo collages for free in seconds. Choose from multiple layouts, adjust borders, and download in high quality without watermarks.
Video Frame Extractor - Capture high-resolution stills
Extract individual images from your videos with frame-perfect precision. Capture perfect moments in HD locally and for free.
Online Privacy Editor - Pixelate and hide faces in photos
Protect your identity by censoring sensitive areas of your photos. Pixelate faces, blur documents, or cover private information 100% locally.
Baby Calculators
6 toolsBaby Feeding Calculator
Calculate how much milk your baby needs based on weight and age. Recommended feeds, milliliters per feed, and hunger and fullness cues.
Baby Size Converter
Convert baby clothing sizes between Zara, H&M, Primark, Carter's, Kiabi, Mango, and Mayoral. Enter your baby's height and weight to get the exact size for each brand.
WHO Percentile Calculator for Babies
Calculate your baby's weight, height and BMI percentile using WHO growth charts (0-5 years).
Fertile Days Calculator
Calculate your fertile window and ovulation date based on your menstrual cycle.
Pregnancy Weeks Calculator
Calculate exactly which week of pregnancy you are in, your trimester, and your estimated due date.
Baby Vaccination Calendar in Spain
Calculate the exact vaccination dates for your baby according to the AEP 2026 schedule.
Online Image Converters
21 toolsConvert PNG to JPG Online
Convert PNG images to JPG directly in your browser. No file uploads to servers. Fast, free and completely private.
Convert JPG to PNG Online and Free
Convert JPG images to PNG in your browser without uploading files. Lossless conversion, free and completely private.
Convert WebP to PNG Online and Free
Convert WebP images to PNG in your browser. Preserves transparency. No file uploads to servers. Free and 100% private.
Convert WebP to JPG Online and Free
Convert WebP images to JPG without uploading files. 100% private local processing. Transparent backgrounds are automatically replaced with white.
Convert PNG to WebP Online and Free
Convert PNG images to WebP in your browser. Up to 40% less file size. Preserves transparency. No file uploads. Free and private.
Convert JPG to WebP Online and Free
Convert JPG images to WebP in your browser. Superior compression without visible loss. No file uploads. Free, unlimited and private.
Convert SVG to PNG Online and Free
Convert SVG vector files to PNG in your browser. Double-scale HD output. Preserves transparency. Free and 100% private.
Convert SVG to JPG Online and Free
Convert SVG vector files to JPG in your browser. 2x high resolution rendering. No file uploads. Free and 100% private.
Image to Base64 Converter Online
Convert any image to Base64 code and Data URI directly in your browser. No file uploads. Free, private and instant.
Convert BMP to JPG Online
Convert BMP images to JPG in your browser. Drastically reduce file size. No file uploads to servers. Free and 100% private.
BMP to PNG Converter
Convert BMP images to PNG without quality loss. Modern compression without artifacts. No file uploads. Free and 100% private.
Convert BMP to WebP Free
Convert BMP images to WebP offline. Reduce huge files to kilobytes. No file uploads. Free, offline and completely private.
Convert AVIF to JPG Online
Convert AVIF images to JPG in your browser. No server. 100% private local processing. Free and unlimited.
Convert AVIF to PNG Online
Convert AVIF images to PNG preserving transparency. No file uploads. Processed locally in your browser. Free and unlimited.
Convert AVIF to WebP Online
Convert AVIF images to WebP with better compatibility. Local processing without servers. Free, private and unlimited.
Convert GIF to JPG Online
Extract the first frame of your GIFs and convert to JPG. No server. Processed locally in your browser. Free and unlimited.
Convert GIF to PNG Online
Extract the first frame of your GIFs and convert to PNG preserving transparency. No server. Local processing. Free.
Convert GIF to Static WebP
Convert animated GIFs to static WebP. Preserves transparency. No server. Processed locally in your browser. Free.
Convert PNG to ICO Online
Convert PNG to ICO with real binary headers. Transparencies preserved. No file uploads. Free and 100% private.
JPG to ICO Converter
Convert JPG photos to ICO with real Microsoft binary headers. Automatic square crop. No file uploads. Free and private.
Convert WebP to ICO
Convert WebP images to official ICO with transparency. No file uploads. Real Microsoft binary headers. Free and private.
Precision Cooking Tools and Calculators
12 toolsUS Cooking Conversion Calculator: Cups to Grams
Convert cups, tablespoons, and Fahrenheit to the metric system. Your professional compass for decoding American recipes with absolute precision.
Professional Meringue Sugar Ratio Calculator
Calculate the exact amount of sugar for French, Italian, or Swiss meringue based on your egg whites' weight. Mastering stiff peaks with professional precision.
Banana Diagnostics and Conservation: Scientific Guide
Analyze your banana ripening stage with scientific precision. Learn conservation techniques, ethylene biochemistry, and nutritional optimization.
Precision Scientific Egg Timer and Altitude Calculator
Master the thermodynamics of the perfect egg. Calculate exact boiling times based on your altitude, egg size, and initial temperature.
Multiple Kitchen Timer
Manage multiple cooking times simultaneously. Independent alarms, ideal for chefs and kitchen organization (Mise en Place).
Neapolitan Pizza Dough Calculator
Calculate the exact proportions of flour, water, salt and yeast to prepare authentic Neapolitan pizza at home with professional results.
Equilibrium Brining and Fermentation Calculator
Master the science of equilibrium brining for juicy meats and perfect fermentations. Calculate exact salinity based on total product and water weight.
Cake Pan Size Converter and Baking Scaler
Scale any baking recipe to your pans instantly. Calculate the conversion factor for round, square, and rectangular molds with professional precision.
Professional Recipe Ingredient Scaler
Automatically scale your recipes based on serving count. Calculate exact ingredient amounts to multiply or reduce any recipe with professional precision.
Sourdough Starter Feeding Calculator
Automatically calculate exact proportions of starter, flour, and water for your sourdough maintenance and feeding. Preset or custom ratios available.
Professional Roux Ratio Calculator and Sauce Guide
Master the foundation of French mother sauces. Calculate exact roux proportions for Béchamel, Velouté, and Espagnole with professional accuracy.
Smart Cookware Selector | Kitchen Utensils Guide
Interactive guide to choose the best pan or pot based on your cooking style. Iron vs Stainless Steel vs Teflon. Find your perfect tool.
Creativity and Leisure
6 toolsExcuse Generator
Semantic gambling machine to get rid of commitments with style. Generate surreal and irrefutable excuses instantly.
Fortune Cookie
Check your daily destiny and discover your lucky numbers. One fortune per day, revealed with a click.
Synesthesia Painter
Visualize the color of words according to grapheme-color synesthesia. Each letter has its own color, turning text into chromatic art.
Zalgo Generator
Corrupt your messages with cascading overflowing Unicode characters. Adjust intensity and direction of the glitch effect.
Pattern Generator
Create pixel art and bead schemes for Miyuki or Hama from your photos. Color quantization algorithm, tunnel vision mode, and ZIP export.
Dice Roller
A complete dice simulator for your RPG and board games. Roll d4, d6, d8, d10, d12, d20 and d100 with modifiers and history.
Drone and Ham Radio Tools and Calculators
3 toolsDrone Flight Time Calculator | Estimate LiPo/Li-Ion Endurance
Calculate how long your drone can fly based on mAh capacity and current draw. Optimize your LiPo batteries for safe flights and maximum duration.
RF Antenna Length Calculator | FPV Dipoles and Whips
Calculate the exact measurement for your 868MHz, 2.4GHz, and 5.8GHz antennas. Improve your drone's range and avoid burning your transmitter with optimized SWR.
GPS Coordinates Converter | Decimal to DMS Online Free
Convert GPS coordinates from Decimal to Degrees, Minutes, and Seconds (DMS) instantly. Visual tool with map for drones, sailing, and geolocation.
Tools and Calculators for Students and Education
2 toolsWeighted Grade & Final Score Calculator
Stop stressing over your GPA! Easily calculate your course grades and final marks. Just enter your assignments, exams, and their weights to see where you stand.
Citation Generator
Create automatic references in APA, MLA, and Vancouver formats with persistent storage.
Viral Challenges & Games | Typing Test & Addictive Speed Challenges
1 toolSailing & Nautical
6 toolsTide Height Calculator
Estimate water depth at any point in the tidal cycle using the nautical Rule of Twelfths. Ideal for coastal planning and nautical licence study.
Under-Keel Clearance Calculator
Calculate the safe time window to cross bars, channels or draft-restricted points. Enter your boat draft, chart depth and tidal data to get the exact safe passage interval.
Nautical Units Converter
Convert nautical miles, knots, fathoms and atmospheric pressure. Includes interactive Beaufort scale for wind speed.
Sail Area and SA/D Ratio Calculator
Calculate the total sail area and sail area to displacement ratio of your boat. Nautical performance analysis based on I, J, P and E measurements.
Nautical Speed Converter and Beaufort Scale
Convert between knots, km/h, m/s and mph instantly. Includes full Beaufort table with sea state descriptions and wind effects.
Nautical Endurance Calculator
Calculate your maximum range and safe distance based on fuel consumption, tank capacity and cruise speed. Fuel management for motorboats.
Interactive Scientific Tools and Simulators
5 toolsColony Counter: Digital CFU Counting Tool for Petri Plates
Digital tool for counting bacterial colonies on Petri plates. Differentiate types, avoid errors, and calculate CFU with precision.
Asteroid Impact Simulator: Apocalypse Calculator
Simulate asteroid impacts with real physics. Calculate energy, crater, thermal radiation and shockwave. Would you survive Chicxulub?
Microwave Leak Detector: WiFi Interference Visualizer
Analyze if your microwave is leaking radiation by measuring real-time interference on your WiFi network. A scientific safety tool.
Simulation Probability Calculator: Do You Live in a Virtual Universe?
Analyze if our reality is a simulation using Nick Bostrom's trilemma argument. Calculate existential probability with 4 key parameters.
Cellular Renewal Calculator: How Much is Left of the Original "You"?
Calculate the percentage of your body that has renewed since birth. Estimates based on the cell division rate of organs, bones, and tissues. The Paradox of Theseus made tangible.
Tools and Calculators for Travelers and Adventurers
4 toolsCarry-on Luggage Calculator: Airline Measurements 2026
Check the dimensions and weight allowed for your carry-on suitcase and personal item on Ryanair, Vueling, Iberia, and +30 airlines. Avoid surcharges!
International Tip Calculator
Calculate how much to tip on your trips. Includes percentage guide and etiquette rules for more than 50 countries. Don't mess up when paying!
Suitcase Checklist Generator | Create your packing list
The ultimate online tool to organize your luggage based on trip type, destination, and duration. Never forget your travel essentials again.
Mini Adventure Forecast - Get Out of the Rut
Random daily challenge generator to break monotony and explore your surroundings.
Textile Tools
12 toolsFabric Truthfulness: Textile Quality Analysis
Discover the real quality of your garments by analyzing their composition. Is it real cotton or expensive plastic? Scientific fiber analysis.
Textile Care Guide: How to Wash Every Fabric Type
Scientific guide to washing and caring for cotton, wool, silk, linen, and synthetics. Prevent shrinkage, fading, and damage with proper care instructions.
Stain Chemical Protocol for Textiles
Scientific protocols to remove stains based on fiber type and the chemical nature of the stain. Percarbonate, enzymes, solvents: the right method for every case.
Textile Burn Test
Identify the real composition of any fabric by analyzing its burning behavior. Scientifically differentiate cotton, wool, silk and synthetics.
Fiber Preparation for Natural Dyeing
WOF calculator, mordanting protocols and thermal ramps to prepare wool, silk and cotton before natural dyeing.
International Shoe Size Converter
Convert shoe sizes between US, European (EU), UK and centimetre (CM) systems. Size guide for men and women.
International Clothing Size Converter
Convert clothing sizes between EU, US, UK and IT systems. Shirts, pants, dresses and jackets for men, women and unisex. Includes measurement guide and brand fit recommendations.
Knitting Gauge Calculator
Easily recalculate stitches and rows for any knitting or crochet pattern. Adjust gauge by multiples and scale factor for a professional result.
Fabric Consumption Calculator by Garment
Easily calculate how much fabric you need to sew a skirt, trousers, a dress or a shirt. Adjust by fabric width and size for a professional cut.
Sewing Pattern Scaler Online
Adjust any sewing pattern to your real measurements. Differential scaling calculator with updated pattern preview.
Knitting and Crochet Needle Converter
Convert needle sizes between Metric (mm), US and UK systems with yarn weight recommendations and WPI.
Yarn Calculator: How many metres and balls do I need?
Accurately calculate the amount of yarn needed for your knitting and crochet projects based on pattern and size.
Home Calculators and Utilities
7 toolsOffline QR Code Generator
Generate QR codes for WiFi, URLs and Contacts 100% securely in your browser. Your data never leaves your device.
Solar Panel Tilt Angle Calculator
Calculate the optimal tilt angle for your solar panels based on your geographic latitude. Get values for fixed installations and seasonal adjustments.
Projector Throw Distance Calculator
Calculate the exact distance to install your projector based on your desired screen size and Throw Ratio. Visual tool with real-time simulation.
Dew Point Calculator
Calculate the condensation temperature on your walls using ambient humidity and temperature. An essential tool for preventing dampness and protecting the structural health of your home.
LED Saving Calculator
Calculate how much money and kWh you save by switching your traditional bulbs to LED. Discover your exact annual and monthly savings plus CO2 reduction.
Electricity Tariff Comparator: Fixed vs Variable Price
Find out which electricity tariff suits you best. Compare the regulated market (PVPC) vs the free market based on your consumption and save hundreds of euros on your electricity bill.
Gas vs. Heat Pump vs. AC: Savings & Consumption Comparator
Calculate how much you save by switching your gas boiler for an air source heat pump or AC. Real consumption and efficiency comparison for your home.
File and Text Tools
8 toolsClipboard to Image
Convert your clipboard content into a downloadable image file instantly. 100% private and local: your screenshots never leave your browser.
Text Format Stripper
Remove junk formatting from any copied text: double spaces, stray line breaks, and invisible characters. Convert to upper or lower case with a single click.
Character and Word Counter
Count characters, words, lines, and paragraphs in real time. Estimate reading and speaking time. Perfect for SEO, social media, and professional writing.
SHA-256 Hash Verifier
Verify the integrity of your files by computing their SHA-256 signature 100% locally and securely. Compare checksums for ISOs, installers, and downloads without uploading anything to any server.
HTML to Markdown Converter
Convert HTML or rich text to clean Markdown instantly, entirely in your browser. Paste content from any website or document and get ready-to-use Markdown without sending anything to any server.
Free Online Emoji and Double Space Remover
Clean your texts instantly: remove WhatsApp emojis, normalize multiple spaces, and delete invisible characters for a professional, polished result.
Online Text Splitter | List to Lines Converter
Split comma-separated, space-separated or custom-delimited lists into individual lines instantly. Free tool to clean and organize data online.
JSON to Excel & CSV Converter Online - 100% Local & Secure
Transform complex JSON files into Excel or CSV spreadsheets instantly. With automatic object flattening and complete local privacy.
Social Media Tools
7 toolsSocial Safe Zones: Video Simulator for TikTok, Reels & Shorts
Preview your images and videos with the real social media interface. Ensure your content is always visible and avoid accidental cropping.
YouTube Thumbnail Extractor (HD)
Extract and download the original thumbnail image from any YouTube video at maximum resolution and without watermarks using just the URL.
Social Media Account Value Calculator: TikTok & Instagram Pricing
Find out how much to charge for sponsored posts. Our calculator analyses followers, engagement and niche to give you a fair market value.
Reddit Text Formatter - Cleaner and Markdown Fixer
Advanced text cleaner for posting on Reddit. Fixes missing line breaks, removes multiple spaces and hidden characters that break Markdown.
Social Media Image Resizer - Crop & Resize for Every Platform
Resize and crop your photos for Instagram, TikTok, YouTube and more. Smart cropping with updated official dimensions for 2026.
Tinder Photo Optimizer: Face Analysis and Composition
Optimize your Tinder photos with algorithmic face analysis. Simulates the 2026 interface, analyzes scientific framing and eye-line, exports perfect 9:16 portrait photos to maximize matches.
YouTube Thumbnail Previewer Online - Boost Your CTR for Free
Upload your thumbnail and see how it looks in the real YouTube feed on mobile and desktop. Dark and light mode simulator to optimize clicks instantly.