Free online tools for unit conversion, colors, fonts, images, text & news.
Tools for everyone. Convert units, generate color palettes, browse fonts, compress images, edit text, and explore tech history, all free, no sign-up required.
À propos
OmniConverter est un convertisseur d'unités en ligne gratuit conçu pour la précision, la rapidité et la simplicité. Que vous ayez besoin d'un convertisseur de devises avec des taux de change en direct, d'un convertisseur de longueur entre miles et kilomètres, d'un convertisseur de poids de kg en lbs ou d'un convertisseur de température de Celsius en Fahrenheit, tout est ici en un seul endroit.
OmniConverter couvre tout, des besoins quotidiens comme la conversion de pointures et de tailles de vêtements aux exigences techniques comme le stockage numérique, le courant électrique, la fréquence et les unités typographiques. Chaque convertisseur est gratuit, sans compte requis, fonctionne instantanément sur tout appareil et utilise des facteurs de conversion exacts, pas des approximations arrondies. Plébiscité par les étudiants, les professionnels, les voyageurs et les développeurs du monde entier.
Pourquoi Nous
Une précision professionnelle pensée pour tous, étudiants, ingénieurs, voyageurs et développeurs.
Les calculs se font pendant que vous tapez en utilisant des facteurs de conversion exacts, jamais d'estimations arrondies.
Des formules scientifiquement exactes pour les 20 types d'unités. Toujours correct, toujours fiable.
Taux de change mis à jour en continu. Prend en charge plus de 150 devises et les principales cryptomonnaies.
Entièrement optimisé pour ordinateur, tablette et mobile. Convertissez n'importe où, n'importe quand.
Pas de compte, pas d'abonnement, pas de publicités bloquant les résultats. Ouvrez et convertissez.
Couvre les systèmes métrique, impérial, américain et les systèmes de tailles régionaux utilisés dans le monde entier.
Référence Rapide
Réponses rapides aux questions de conversion les plus courantes, cliquez sur une ligne pour utiliser le convertisseur en direct.
| Conversion | Résultat | Catégorie | Essayer |
|---|---|---|---|
| 1 mile to km | 1 mile = 1.609 km | Longueur | Convertir |
| kg to lbs | 1 kg = 2.205 lbs | Poids | Convertir |
| Celsius to Fahrenheit | °F = (°C × 9/5) + 32 | Chaleur | Convertir |
| USD to EUR | Live rate | Devise | Convertir |
| 1 gallon to liters | 1 US gal = 3.785 L | Volume | Convertir |
| inches to cm | 1 inch = 2.54 cm | Longueur | Convertir |
| 1 acre to sq ft | 1 acre = 43,560 sq ft | Surface | Convertir |
| mph to km/h | 1 mph = 1.609 km/h | Vitesse | Convertir |
| 1 GB to MB | 1 GB = 1,024 MB | Stockage | Convertir |
| 1 stone to kg | 1 stone = 6.350 kg | Poids | Convertir |
Nos Utilisateurs
Conçu pour tous ceux qui travaillent avec différents systèmes de mesure, des salles de classe aux chantiers.
Des devoirs de physique aux cours de géographie. Couvre toutes les unités de votre programme, métriques, impériales et scientifiques.
Convertissez facilement entre différentes devises, températures et tailles de vêtements. Tout convertir en quelques secondes.
Valeurs de conversion exactes pour la force, la pression, l'énergie, la puissance, le courant et toutes les autres unités d'ingénierie.
Adapter une recette des tasses aux grammes, ou de Fahrenheit en Celsius ? Nos convertisseurs simplifient les recettes internationales.
Décodez instantanément les pointures, tailles de vêtements et prix de marques internationales étrangères.
Vous travaillez avec px, pt, ems, octets ou fréquences ? Conçu avec une précision technique pour un travail technique.
Free • Accurate • Private
You know the feeling: a recipe says cups, your scale says grams. A listing says square feet, you think in square meters. A flight lands and you need USD to EUR before you pay. OmniConverter was built for those small, nagging moments — a free online converter where you type once and see every relevant unit at once, metric and imperial, without juggling tabs.
It covers the everyday and the specialist — length, weight, temperature, area, volume, speed, time, currency, digital storage, plus shoe and clothing sizes, pressure, fuel economy and more — over 20 categories grounded in exact BIPM, NIST and ISO 80000 factors. Whether it’s miles to kilometers, kilos to pounds, Celsius to Fahrenheit, or liters to gallons, you get a clear, trustworthy answer you can act on.
And because life isn’t just numbers, the same suite gives you OmniColors for palettes and gradients, OmniFonts to preview 200+ Google Fonts, OmniImages to compress or convert photos in the browser, OmniDocuments for quick PDF fixes, and OmniText for clean word counts — all free, private (your values never leave your device), and built to feel light on mobile. If you found us by searching online converter, free unit converter, measurement conversion, stay a moment and try one conversion. Most people bookmark it after the first.
It’s fast without feeling rushed. You type, every unit updates live. The math is honest — no rounding until the last display, no “close enough.” No account, no clutter, and it works beautifully on your phone. That’s why students, cooks, travelers, engineers, and shoppers tend to keep OmniConverter open in the background, quietly handling the conversions while they get on with what they actually wanted to do.
More Tools
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Palette generator, gradient maker, color picker, mixer, contrast checker, color names, and more, 9 free tools for designers and developers.
Explore OmniColorsBrowse and preview 200+ Google Fonts in real time. Type any text, adjust the size, and find the perfect font for your project.
Browse FontsText case converter, word and character counter, Lorem Ipsum generator, and diff checker, 4 free tools for writers and developers.
Explore OmniText25 curated historical datasets with interactive timelines, era comparisons, and cross-dataset analysis, explore technology, science, finance, empires, and culture.
Explore OmniHistoryResize, compress, crop, rotate, flip, convert formats, and more, 17 free tools for image editing and optimization.
Explore OmniImagesMerge, split, reorder, compress PDFs, and convert between PDF, Word, and Excel, free document tools for professionals.
Explore OmniDocumentsLatest news, sports, weather, travel, business, politics, and technology, curated news coverage across 7 sections.
Explore OmniNewsGenerate branded QR codes with your logo. Download as transparent PNG or scalable SVG, free, no sign-up required.
Create QR CodeOmniConverter is a free online converter suite for 20+ categories — length, weight, temperature, currency, area, volume, speed, digital storage and more — with live results, exact BIPM/NIST factors, and no sign-up.
Pick a category (e.g., length), choose from and to units, type a value — every unit updates instantly. Example: 5 meters = 16.404 feet. Works for metric to imperial and back.
Yes — factors are from BIPM SI brochure and NIST SP 811, stored unrounded and computed in double precision via a base unit. Conversions run client-side; we do not store your values.
Yes — 150+ currencies + crypto, base USD, daily updates from Frankfurter/ECB. Search “USD to EUR” or open the currency converter for live rates.
Yes — shoe size and clothing size converters use regional tables (US, UK, EU, AU) with cm/inches for precise online shopping conversions.
Yes — English, Spanish, French, German, Chinese, Japanese, Hindi and Arabic, with localized converters and 8-way hreflang for SEO.
OmniConverter is free and built with care. If it helps you, consider supporting its development.
Tips, guides, and insights about unit conversions
One meter equals 100 centimeters exactly by SI definition. Learn the m-to-cm formula, instant conversion table and how to avoid confusing m→cm with cm→m.
Read More about M to CM: How Many Centimeters in a Meter? Instant Conversion
Convert MPG to km/L and L/100 km without errors. US vs UK gallon formulas (×0.425, 235.215÷MPG) plus tables, examples and FAQs for accurate fuel-economy math.
Read More about MPG to KM/L: Convert Miles Per Gallon to Kilometers Per Liter
Why is a UK gallon 4.546 litres vs US 3.785 L — 20% larger? Discover imperial history, Brexit labelling rules, exact formulas and conversion tables for drivers.
Read More about Gallons to Litres UK: Why Your UK Gallon Is Bigger
Since 2019 the kilogram is defined by Planck's constant, not a Paris metal block. Learn what mass is and how kg, pounds and stones translate precisely now.
Read More about The Kilogram Redefined: How Planck's Constant Replaced a Metal Cylinder and Why Mass Matters
Why do ships use knots and jets use Mach? Explore how knots, mph, km/h and Mach numbers measure speed differently for road, sea and air navigation each day.
Read More about Knots, Mach and Kilometers per Hour: The Speed Units Pilots, Sailors and Drivers Rely On
Learn how many liters in a US gallon (3.785 L) vs UK imperial gallon (4.546 L). Compare formulas, see a 1–10 L conversion table and avoid common mistakes.
Read More about Liters to Gallons: How Many Liters in a Gallon? US vs UK Explained
US listings show square feet and EU uses square meters. Learn how acres, hectares and square meters translate for housing, farmland and planning daily.
Read More about Square Meters, Acres and Hectares: How the World Measures Land, Housing and Farms
A US gallon is 3.785 liters, a UK gallon is 4.546. Learn how liters, gallons, cubic meters and fluid ounces convert across cooking, fuel and industrial design.
Read More about Liters, Gallons and Cubic Meters: A Global Guide to Volume in Kitchens and Factories
Pushing a cart and launching a rocket both use force, but one counts newtons and the other pound-force. Learn how these units translate in daily real life.
Read More about Newtons vs Pounds-Force: Understanding Force Units in Engineering and Everyday Life
A kettle is 2000 watts, a car is 300 horsepower. Learn how watts, kilowatts and horsepower measure the same thing—rate of energy use—across homes and vehicles.
Read More about Watts vs Horsepower: What Power Really Means From Light Bulbs to Electric Cars
Why does a 512 GB phone show only 476 GB usable? Understand bits, bytes, KB to TB, the 1024 vs 1000 split, and how to size storage accurately for backups.
Read More about Bits to Terabytes: Why Digital Storage Uses 1024 and How Much Space You Really Need
Food labels show 250 kcal while bills show 300 kWh. Learn how joules, calories and kilowatt-hours track the same energy across cooking and power grids.
Read More about Calories to Kilowatt-Hours: How Energy Units Connect Food, Fuel and Electricity Bills