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Free Online Converters: Currencies, Units & Formats

Access our complete collection of free online converters for all your daily conversions: currencies with real-time exchange rates, measurement units (length, weight, volume, temperature), and file formats. Instant bidirectional conversion without registration.

20 free tools

PDF Converter 2026

Free 8-in-1 PDF converter. PDF to images, merge, split, rotate, compress, extract, watermark. Secure local processing.

Energy Converter

Convert joules, kilowatt-hours, calories and other energy units

Frequency Converter

Convert hertz, kilohertz, megahertz and revolutions per minute

Density Converter

Convert kg/m³, g/cm³ and other density units

Flow Rate Converter

Convert m³/s, liters/minute, gallons/minute and other flow rates

Data Converter

Convert MB, GB, TB and other computer storage units

Length Converter

Convertissez mètres, kilomètres, miles, pieds et autres unités

Weight Converter

Convertissez kilogrammes, grammes, livres, onces et tonnes

Temperature Converter

Convertissez entre Celsius, Fahrenheit et Kelvin

Area Converter

Convertissez mètres carrés, hectares, acres et pieds carrés

Volume Converter

Convertissez litres, millilitres, mètres cubes, gallons et autres unités de volume

Currency Converter 2026

Instantly convert between 150+ currencies with real-time exchange rates. Historical chart, comparison table and bank fee calculator included.

Popular

Convertisseur de pression en ligne

Convertissez easily les unités de pression comme Pascal, bar, atm, psi, mmHg, kPa et hPa grâce à notre convertisseur rapide et gratuit.

Convertisseur d’angles en ligne

Convertissez easily des angles entre degrés, radians et gradians grâce à notre convertisseur d’angles gratuit, rapide et précis.

Convertisseur de masse en ligne

Convertissez quickly des unités de masse comme grammes, kilogrammes, livres, onces ou tonnes grâce à notre convertisseur de masse gratuit et précis.

Convertisseur numérique bases 2, 8, 10 et 16

Convertissez easily des nombres entre les bases binaire, octale, décimale et hexadécimale grâce à notre convertisseur numérique rapide et gratuit.

Online Speed Converter (km/h, mph, m/s & knots)

Convertissez easily les unités de vitesse entre kilomètres par heure, miles par heure, mètres par seconde et nœuds grâce à notre convertisseur rapide et gratuit.

Voltage Converter

Convert voltage units: Volt, mV, kV, MV, µV, dBV, dBmV and more. Full table, Ohm's law calculator and real-world examples.

Time Converter (Seconds, Minutes, Hours and Years)

Quickly convert time units between seconds, minutes, hours, days, weeks, months and years with our simple, fast and free online time converter.

Power Converter

Convert power units: Watt, kW, MW, GW, CV, HP, BTU/h, cal/s, dBm and more. Full table and real-world examples.

Why Use Our Online Converters?

Online converters save you from manually searching for exchange rates, conversion formulas or multiplication factors. Our collection of free 2026 converters covers all daily professional and personal conversion needs.

Real-Time Currency Converter

Our currency converter supports over 150 world currencies with exchange rates automatically updated every hour via the European Central Bank (ECB) API. Instantly convert: EUR to USD, USD to EUR, GBP to EUR, CHF to EUR, and all possible pairs. Perfect for international travel, online shopping abroad, money transfers, or forex market tracking. The converter displays the real interbank rate (mid-market rate) without commercial margin.

Measurement Unit Converters

Our unit converters cover all physical quantities: length (meters, kilometers, miles, inches, feet), mass/weight (kilograms, pounds, ounces, tons), volume (liters, gallons, milliliters), temperature (Celsius, Fahrenheit, Kelvin), area (m², hectares, acres), speed (km/h, mph, m/s), pressure (bar, psi, pascal). Instant bidirectional conversion with exact mathematical formulas. Ideal for DIY, cooking, USA/UK travel, scientific work.

PDF File Converter

Our online PDF converter converts your documents to and from PDF format: Word to PDF (DOCX → PDF), Excel to PDF (XLSX → PDF), Image to PDF (JPG, PNG → PDF), PDF to Word (editing), PDF to Excel (table extraction), PDF to Image. 100% browser processing, your files remain private. Free version limited to 3 conversions/day, unlimited PRO version at $9.90/month.

Conversion Accuracy and Reliability

All our converters use official conversion formulas and internationally standardized conversion factors. For example: 1 inch = 2.54 cm exactly (international definition), 1 pound = 0.45359237 kg precise, temperatures according to formulas °F = (°C × 9/5) + 32. Exchange rates come from official sources (ECB, central banks) and are continuously refreshed. You get reliable results for your professional calculations.

Security and Privacy

Our secure converters work with local processing (client-side) in your browser. The amounts you convert (currencies, dimensions, quantities) are NEVER transmitted to our servers. Exception: PDF converter temporarily uploads files for server conversion, then automatically deletes them after processing (maximum 1-hour retention). GDPR compliance guaranteed.

Frequently Asked Questions

Yes, our currency converter automatically retrieves exchange rates every hour from the European Central Bank (ECB) and other official sources. Displayed rates correspond to the real interbank rate (mid-market rate) used in financial markets. Caution: this rate differs from the commercial rate you'll get at a physical exchange office, which typically applies a 3-8% margin. For significant financial transactions, always verify the final rate with your bank or exchange platform.

Our unit converters use official conversion factors defined by the International System of Units (SI) and international standards. For example: 1 inch = 2.54 centimeters EXACTLY (international legal definition since 1959), 1 pound = 0.45359237 kilograms PRECISE (avoirdupois definition), temperature °F = (°C × 9/5) + 32 (standard thermodynamic formula). Our results are reliable to 10 decimal places for scientific or engineering calculations. You can use our converters with confidence for your professional projects.

No, your files are NOT permanently stored. Here's our process: (1) You upload your file, (2) It's automatically converted on our secure servers, (3) The converted file is sent back to you for download, (4) ALL files (original + converted) are automatically deleted after 1 hour maximum from our servers. We keep no copies and never view your documents. GDPR-compliant processing with SSL/TLS encryption during transfer. For maximum privacy, use our other converters (currency, units) which work 100% locally without upload.

Yes, all our responsive converters are optimized for smartphones (iPhone, Android), tablets (iPad, Samsung Tab) and computers. The interface automatically adapts to your screen size. Input fields and buttons are sized for comfortable touch use. The currency converter in particular is very practical when traveling: you can instantly convert store prices (EUR to your local currency) even without internet connection if you loaded the page beforehand. Rates remain valid for several hours offline.

For currency and unit converters: NO limits. Use them as many times as needed, 24/7, without restrictions. You can convert 1000 different amounts if needed. For PDF converter: free version limited to 3 conversions per day and files up to 10 MB. PRO version ($9.90/month): unlimited conversions, files up to 100 MB, priority processing, batch conversion (up to 20 files simultaneously). This PDF limitation is due to server costs for processing large files.

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Last updated: March 12, 2026
Created on: February 1, 2024