Convert Any UnitInstantly & Accurately
Free online unit converter with 144+ converter categories. Length, weight, temperature, volume, speed, energy, and much more.
Popular Conversions
Most commonly searched unit conversions
Free PDF Tools
Merge, split, compress, and convert PDFs — 100% in your browser
Merge PDF
Combine multiple PDF files into a single document.
Split PDF
Extract pages from a PDF into separate files.
Compress PDF
Reduce PDF file size while maintaining quality.
PDF to Image
Convert PDF pages to JPG or PNG images.
Image to PDF
Convert JPG, PNG, or WebP images into a PDF.
Rotate PDF
Rotate PDF pages to any orientation.
Add Page Numbers
Add page numbers to your PDF document.
PDF to Text
Extract all text content from a PDF file.
Watermark PDF
Add a text watermark to every page of your PDF.
Delete Pages
Remove specific pages from your PDF document.
Reorder Pages
Rearrange the page order of your PDF document.
PDF to Word
Convert PDF to Word document online for free.
Word to PDF
Convert Word documents (DOCX) to PDF instantly.
PDF to Excel
Extract tables from PDF and convert to Excel spreadsheet.
Excel to PDF
Convert Excel spreadsheets to PDF documents.
PDF to PowerPoint
Convert PDF pages to PowerPoint presentation slides.
Text to PDF
Create a PDF document from plain text.
HTML to PDF
Convert HTML code into a PDF document.
Sign PDF
Add your electronic signature to any PDF document.
Crop PDF
Crop and trim margins from your PDF pages.
Flatten PDF
Flatten form fields and annotations in your PDF.
Protect PDF
Add password protection to your PDF file.
Unlock PDF
Remove password protection from your PDF.
Edit PDF
Edit text directly in your PDF document.
PowerPoint to PDF
Convert PowerPoint presentations to PDF.
Organize PDF
Combine, reorder, and delete pages across multiple PDFs.
Repair PDF
Fix corrupted or damaged PDF files.
Redact PDF
Permanently black out sensitive content in your PDF.
Compare PDF
Compare two PDFs side-by-side with difference highlighting.
PDF to PDF/A
Convert PDF to archival PDF/A format.
Scan to PDF
Use your camera to scan documents into PDF.
OCR PDF
Make scanned PDFs searchable with text recognition.
Media Conversion Tools
Convert images, extract audio, resize & compress — all in your browser
Image Converter
Convert images between JPG, PNG, and WebP formats.
Image Compressor
Reduce image file size while maintaining quality.
Image Resizer
Resize images to any custom dimension.
Video to Audio
Extract audio from MP4, WebM, and other video files.
Audio Converter
Convert audio files between WAV and WebM formats.
Trim Audio
Cut and trim audio files with waveform preview.
Image Rotate
Rotate images by any angle.
Image Crop
Crop images by drawing a selection area.
Image Watermark
Add text watermarks to your images.
EXIF Viewer
View and strip EXIF metadata from JPEG images.
Create GIF
Create animated GIFs from multiple images.
Trim Video
Cut and trim video files in your browser.
Change Speed
Speed up or slow down audio and video files.
Merge Media
Merge multiple audio or video files into one.
Extract Frames
Extract image frames from video files.
YouTube to MP3/MP4
Download YouTube videos as MP3 audio or MP4 video.
JPG to WebP
Convert JPG images to WebP format for smaller file sizes.
PNG to WebP
Convert PNG images to WebP for better compression.
WebP to JPG
Convert WebP images to widely compatible JPG format.
HEIC to JPG
Convert iPhone HEIC photos to universal JPG format.
Free Online Calculators
Health, fitness, finance, and lifestyle calculators
BMI Calculator
Calculate your Body Mass Index based on height and weight.
Calorie Calculator
Estimate your daily calorie needs based on activity level.
Percentage Calculator
Calculate percentages, increases, decreases, and differences.
Loan Calculator
Free Loan Calculator – Calculate Monthly Payments Instantly. Enter your loan amount, interest rate, and term to get accurate results in seconds.
Pregnancy Calculator
Calculate your estimated due date and pregnancy milestones.
Fasting Timer
Track your intermittent fasting windows and progress.
Due Date Calculator
Calculate project or assignment due dates with working days.
Sleep Calculator
Find the best time to sleep or wake up based on sleep cycles.
Timezone Converter
Convert time between 24+ timezones with live clocks. Perfect for scheduling across the world.
Try it nowAll Unit Converters
Browse our complete collection of unit converters
Common Converters
16Engineering Converters
8Heat Converters
10Fluids Converters
10Light Converters
5Electricity Converters
15Charge
8 units
Linear Charge Density
4 units
Surface Charge Density
4 units
Volume Charge Density
4 units
Current
6 units
Linear Current Density
4 units
Surface Current Density
4 units
Electric Field Strength
6 units
Electric Potential
7 units
Electric Resistance
7 units
Electric Resistivity
4 units
Electric Conductance
5 units
Electric Conductivity
6 units
Electrostatic Capacitance
5 units
Inductance
8 units
Magnetism Converters
4Radiology Converters
4About Unit Conversion
A unit is a measurement of a quantity that is defined or adopted by tradition or law. Other quantities can be expressed as a multiple of the unit.
In human history, various unit systems were developed and used in different regions and cultures. Currently, the global standard of measurement is the International System of Units (SI), which is a modern form of the metric system.
Although SI is intended for global use, it has not been fully adopted, and some other systems of measurement are still used in parts of the world. FastConvert provides a convenient means to convert between the various units of measurement within different systems.
Why Use FastConvert?
100% Browser-Based — No Uploads
Every tool on FastConvert runs directly in your browser using JavaScript and WebAssembly. Whether you are merging PDFs, converting images, or compressing files, your data never leaves your device. Nothing is sent to a server. This makes FastConvert safe, private, and fast — there is no waiting for uploads or downloads from a remote server.
Completely Free — No Account Required
Every one of FastConvert's 140+ tools is available entirely free of charge. There is no registration, no email address required, no daily usage limit, and no watermark on converted files. We believe useful tools should be accessible to everyone without barriers, whether you are a student, professional, or casual user.
Unit Converters for Every Field
FastConvert covers more than 144 unit converter categories spanning everyday measurement types (length, weight, temperature, volume) as well as specialized scientific and engineering units (viscosity, magnetic flux, thermal conductivity, radiation). Whether you need to convert centimeters to inches for a craft project or pascals to PSI for an engineering calculation, FastConvert has the right tool.
PDF Tools That Respect Your Privacy
Many online PDF tools require you to upload your documents to third-party servers, raising privacy and security concerns. FastConvert's PDF tools — including Merge PDF, Split PDF, Compress PDF, PDF to Image, and more — process everything locally in your browser. Your contracts, invoices, and personal documents stay on your device at all times.
Health and Finance Calculators
Beyond unit conversion, FastConvert offers 11 practical calculators for everyday life. Calculate your BMI or daily calorie needs, estimate loan repayments, find your ideal sleep schedule, plan your pregnancy milestones, set a fitness pace target, or calculate your daily water intake. All calculators are evidence-based and designed to give accurate, actionable results.
Works on Any Device, in Any Language
FastConvert is fully responsive and optimized for smartphones, tablets, and desktop computers. The entire platform is available in English, Arabic, Chinese, German, and French, with right-to-left layout support for Arabic users. No app installation is needed — just open your browser and start working instantly, wherever you are.