NetToolKit
Simple tools for the internet, files, and everyday digital tasks.
Fast, free online tools that work directly in your browser.
Browse by category
Pick a category to explore the available tools.
Internet Tools
Calculators and converters for download, upload, bandwidth and network speeds.
4 tools
File Tools
Process images, convert formats and inspect files directly in your browser.
2 tools
Converters
Convert between units, formats and standards — fast and accurate.
5 tools
Calculators
Everyday digital calculators for file sizes, aspect ratios and more.
1 tool
Popular tools
The most-used tools on NetToolKit.
Download Time Calculator
Estimate download time from file size and speed.
Upload Time Calculator
Estimate upload time from file size and speed.
Bandwidth Calculator
Estimate bandwidth needs from user count and data usage.
Mbps to MB/s Converter
Convert Mbps to megabytes per second (MB/s).
File Transfer Time Calculator
Estimate file transfer time across different media.
Image Compressor
Compress JPG, PNG and WebP images in your browser.
Image Resizer
Resize images in your browser to any dimension.
JPG to PNG Converter
Convert JPG images to PNG in your browser.
PNG to JPG Converter
Convert PNG images to JPG in your browser.
File Size Converter
Convert between file size units (B, KB, MB, GB, TB).
Aspect Ratio Calculator
Calculate aspect ratios and solve for missing dimensions.
Why NetToolKit?
A focused, lightweight toolkit built around a simple promise: useful tools, instantly, without giving up your data.
Free to use
Every tool on NetToolKit is free, with no hidden limits or paywalls.
No registration
Use any tool instantly — no accounts, no signups, no emails.
Fast
Built for speed. Pages load instantly and tools calculate in milliseconds.
Privacy-friendly
Files are processed locally in your browser whenever technically possible.
Works on mobile
Mobile-first design that feels natural on phones and tablets.
Built for the open web
Fast, accessible, SEO-friendly pages that load anywhere.
Frequently asked questions
Quick answers to the most common questions.
From the blog
Practical guides and clear explanations.
Gigabit Internet Explained: What 1000 Mbps Actually Gets You
Gigabit plans sound impressive, but most households can't use anywhere near the full speed. Here's what it actually changes in practice.
Sep 13, 2026Internet · 7 min readWhy File Transfers Never Match the Math (Real-World Network Overhead Explained)
A calculator says a transfer should take 40 seconds, and it takes a minute instead. Here's exactly where that extra time goes.
Sep 12, 2026Calculators · 6 min readAspect Ratios for Social Media: A Practical Cheat Sheet
Every platform crops your image or video differently. Here are the aspect ratios that actually work across Instagram, YouTube, TikTok and more.
Sep 11, 2026Recently added
See all →Aspect Ratio Calculator
Calculate aspect ratios and solve for missing dimensions.
File Size Converter
Convert between file size units (B, KB, MB, GB, TB).
PNG to JPG Converter
Convert PNG images to JPG in your browser.
JPG to PNG Converter
Convert JPG images to PNG in your browser.
Image Resizer
Resize images in your browser to any dimension.
Image Compressor
Compress JPG, PNG and WebP images in your browser.