About FileSize.org
Your trusted resource for file size information
Our Mission
FileSize.org is dedicated to providing accurate, easy-to-use tools and information for anyone dealing with file sizes, storage capacities, and data transfers. Whether you're a developer, content creator, IT professional, or everyday user, we're here to help you understand and work with digital file sizes.
🎯 Accuracy
We provide precise calculations using both binary (1024) and decimal (1000) standards, ensuring you get the right answer for your specific needs.
⚡ Speed
All our tools run directly in your browser. No server round-trips, no waiting. Instant results as you type.
🔒 Privacy
Your data never leaves your device. All calculations happen locally in your browser. We don't track or store your inputs.
📚 Education
Beyond just tools, we explain the concepts. Learn why 1 KB can be both 1000 and 1024 bytes, and when each applies.
What We Offer
🔄 Unit Converters
16 converters covering all common file size units from bits to petabytes, including network speeds (Mbps to MB/s).
Explore Converters →🧮 Calculators
5 specialized calculators for video, audio, image file sizes, storage planning, and bandwidth requirements.
Try Calculators →📊 Platform Limits
12 platform guides detailing file size limits for Discord, Gmail, WhatsApp, cloud storage services, and more.
Check Limits →📖 Compression Guides
6 in-depth guides on compressing videos, images, PDFs, and audio files without losing quality.
Read Guides →Why Choose FileSize.org?
No Registration Required
All our tools are free to use without creating an account. No email required, no signup forms, just instant access to the tools you need.
Mobile Friendly
Every page is optimized for mobile devices. Calculate file sizes, check platform limits, or read guides comfortably on any screen size.
Constantly Updated
Platform limits change, new formats emerge, and compression techniques improve. We keep our information current with the latest standards and limits.
Open Source Friendly
We believe in transparency. Our calculations use standard formulas, and we explain exactly how each tool works.
By the Numbers
Built With Modern Technology
FileSize.org is built using modern web technologies for optimal performance:
- Pure JavaScript: All calculations run client-side for instant results
- Responsive CSS: Mobile-first design that works on any device
- Semantic HTML: Accessible and SEO-friendly markup
- No Tracking: No analytics, cookies, or user tracking
- Fast Loading: Minimal dependencies for quick page loads
- Dark Mode: Easy on the eyes with our default dark theme
Get In Touch
Have a suggestion, found an error, or want to see a new feature? We'd love to hear from you!
🐛 Report Issues
Found a bug or incorrect information? Let us know so we can fix it.
💡 Suggestions
Have ideas for new tools or guides? We're always looking to improve.
Start Using Our Tools
Ready to convert, calculate, or optimize your files?