File Size Converter: Convert KB, MB, GB, TB Online | Free

A KB (kilobyte) = 1000 bytes (SI decimal). KiB (kibibyte) = 1024 bytes (IEC binary). Operating systems often mix these, causing confusion.

A Drive manufacturers use SI (1TB = 1,000,000,000,000 bytes), but OS uses binary (1TiB = 1,099,511,627,776 bytes), so a 1TB drive shows as ~931 GiB.

A Yes.

A Many online services, like email attachments or website forms, impose specific file size limits, often expressed in megabytes (MB), even if your original file is in gigabytes (GB). Our File Size Converter helps you quickly understand if your large files fit these requirements by showing you the exact MB equivalent, ensuring a smooth upload process without unexpected errors.

A Accurate conversion between SI (decimal, e.g., GB) and IEC (binary, e.g., GiB) units is crucial for server and cloud management to avoid capacity miscalculations. Cloud providers often quote in SI units, while operating systems and applications display in IEC. Using a reliable file size converter ensures you provision the correct storage, prevent unexpected "out of space" errors, and optimize costs by understanding exact capacity differences.

A You can input the capacity of a floppy disk, like 1.44 MB, and see its exact byte equivalent. For example, 1.44 MB is 1,509,949,440 bytes. This tool helps you visualize those old storage limits against modern file sizes. It’s a fun way to see how much storage has evolved. Just enter '1.44' into the MB field and hit convert.

A Absolutely. This converter handles raw data units, so you can manually calculate bitrates by dividing file size by duration. For example, a 1.5 GB video that's 2 hours long has a bitrate around 1.7 Mbps. Just convert 1.5 GB to megabits (12,000 Mb), then divide by 7,200 seconds. Internet speeds are measured in bits per second, so converting byte-based file sizes to bits helps you estimate download times. Try converting 500 MB to megabits (4,000 Mb) at a 50 Mbps connection for an 80-second download.

A Yes, this converter fits video workflows perfectly. DaVinci Resolve or Premiere Pro often display project sizes in MB or GB, but export settings might ask for kilobits per second. Try converting a 4.2 GB render to MB: you get 4,200 MB. That clarity helps you guess if it'll fit a 32 GB SD card before exporting. For bitrate math, convert your file to bits first — 1 GB equals 8,000 Mb. Then divide by your video length in seconds. It saves a lot of trial and error.

A That's a classic gotcha. Internet plans advertise speeds in megabits per second (Mbps), but file sizes show in megabytes (MB). One byte equals 8 bits, so a 100 Mbps connection actually downloads at 12.5 MB/s max. Try it here: convert 100 megabits to megabytes. You'll get 12.5 MB. Misunderstanding this makes you think your connection is 8 times slower than it really is. Quick trick: divide any Mbps number by 8 for the real-world MB/s speed.

A Yes, it does — up to exabytes for SI and exbibytes for IEC. Scientists working with genome sequencing or large-scale climate models need those higher units. Enter 3.2 PB into the petabyte field, and you'll see it as 3,200,000 GB. That's useful when comparing cloud storage tiers. Just don't try fitting that on your laptop.