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File Size — Free Online Tool
Upload forms say a photo must be under 200 KB, a phone offers 128 GB and a movie weighs 1.4 GB. This file size converter translates between bytes, kilobytes, megabytes, gigabytes and terabytes so you can compare those numbers directly. Enter a value, choose the unit it is in and choose the unit you want, and the answer appears instantly with up to four decimal places. It is practical for resizing documents to meet government portal limits such as passport photo and signature uploads, estimating how many photos fit on a memory card, checking whether a video will fit in an email attachment or working out mobile data consumption. The tool uses the binary convention where each step is 1,024 times larger, which matches how Windows and most operating systems report file sizes. Storage manufacturers, however, often use 1,000 per step, which is why a 500 GB drive appears as roughly 465 GB when you plug it in. Keep that difference in mind when comparing advertised capacity to what your computer shows. Note that this tool covers storage units, not network speeds in megabits per second, which are eight times smaller than megabytes. Conversions are calculated in your browser and nothing is uploaded.
Use our File Size on AllConvertor — no registration, no download, works on iPhone, Android, Windows, and Mac. All processing runs in your browser when possible for maximum privacy and speed.
How to use File Size
- Enter the file size or storage value.
- Select the current unit in the From dropdown.
- Select the target unit in the To dropdown.
- Read the converted size shown below.
Key benefits
- ✓ 100% free — no paywall or trial limits
- ✓ No account or email required
- ✓ Mobile-friendly responsive design
- ✓ Instant results in your browser
- ✓ Secure — data stays on your device
- ✓ Trusted by thousands of users daily
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Frequently Asked Questions
How many MB are in a GB?
There are 1,024 MB in 1 GB using the binary convention this tool follows.
How do I convert KB to MB?
Divide the kilobytes by 1,024. A 2,048 KB file is 2 MB.
Why does my 500 GB drive show less space?
Manufacturers count 1 GB as 1,000,000,000 bytes, while operating systems usually divide by 1,024 per step, so the displayed capacity looks smaller.
What is the difference between MB and Mbps?
MB is megabytes, a storage amount. Mbps is megabits per second, a speed. Eight megabits equal one megabyte, so a 80 Mbps connection downloads about 10 MB per second at best.
Which units does the converter support?
Bytes (B), kilobytes (KB), megabytes (MB), gigabytes (GB) and terabytes (TB).