Free calculator
Will my file fit the upload limit?
Enter the limit a form or portal gives you. This checker tells you the exact size your file must hit and sends you to a free tool that compresses it there, all in your browser.
How to hit the target
- Read the exact limit from the form. It is usually printed next to the upload box.
- Type that number above and pick KB or MB and your file type.
- Aim for the safe target this checker gives you, which sits just under the limit.
- Open the linked compressor, set that target, and download a file that fits.
Aim a little under the stated limit. A file measured as exactly at the cap sometimes still fails because of how the portal rounds sizes, so a small buffer saves a second attempt.
Frequently asked questions
What does an upload size limit mean?
It is the largest file a form or portal will accept, usually written in KB or MB. A file above the limit is rejected on upload. You have to shrink it below the limit before the form will take it.
Is 1 MB the same as 1024 KB or 1000 KB?
It depends on the portal. Many use 1 MB equals 1024 KB, some use 1000 KB. This checker shows both target numbers so you can aim for the safer, smaller one.
Does this checker upload my file?
No. It only does the math on the number you type. The compressor it links to also runs in your browser, so your actual file is never uploaded to a server.