Does my data get uploaded anywhere?
No. Everything runs locally in your browser and nothing is sent to a server.
Is this free to use?
Yes. It is completely free, with no account, no signup, and no usage limits.
Does it work on a phone?
Yes. The page runs in any modern mobile browser, on iPhone and Android alike, with no app to install.
Why does my 1 TB drive show as 931 GB in Windows?
The drive really does hold 1,000,000,000,000 bytes, which is 1 TB in decimal units. Windows divides by 1024 three times, giving 931.32, but still writes the label as GB instead of GiB. Nothing is missing, the two are counting in different bases.
How many megabytes are in a gigabyte?
1000 MB in a GB, and 1024 MiB in a GiB. The mixed case is the one that surprises people: 1 GiB is 1073.741824 MB. Pick the row that matches the ladder your source is using.
How long does a 5 GB download take on a 100 Mbps connection?
5 GB is 5,000,000,000 bytes, which is 40,000 megabits, so at a full 100 Mbps it takes 400 seconds, about 6 minutes 40 seconds. Real throughput is lower because of protocol overhead, but the factor of 8 between bits and bytes is where most estimates go wrong.
Will a huge byte count print in full?
Yes. A terabyte shows as 1000000000000 bytes rather than in exponential notation, so you can read it and paste it into a spreadsheet. Only genuinely extreme values, above a quadrillion, switch to exponential form.
Should I write KB or KiB in a spec?
Use KiB, MiB and GiB when you mean powers of two, and KB, MB and GB when you mean powers of ten. The IEC binary prefixes exist precisely to remove the ambiguity, and both sets are in this converter so you can state exactly which one you mean.
Is a megabit the same as a megabyte?
No. A megabit is 1,000,000 bits, which is 125,000 bytes, so a megabyte is 8 times bigger. ISPs advertise in megabits because the number is larger, and this converter includes the bit so you can do the divide by 8 without thinking about it.