About this tool
Upload forms fail for boring reasons. The photo is 260 KB against a 200 KB cap, or the document is a PNG where the form wanted a PDF, and you find out after the session has timed out and the page has forgotten half of what you typed. This tool is the thirty-second version of that check, done before you open the portal at all.
Add everything you plan to upload, type the size limit the form gives, pick the format it wants, and run it. You get one line per file: PASS or CHECK, the file’s size against your limit, and a note when the extension does not match. It is a list you can work down, and it does not need a connection, an account or an upload.
Be clear about what the format test is. It reads the characters after the last dot in the filename and compares them to your selection. It never opens the file. That is fast and private, and it catches the common mistake of exporting a PNG when a PDF was asked for, but it will happily approve a file someone has renamed. It also cannot know what the portal you are using actually requires. The numbers you type are yours, taken from the instructions on that site — go and read them, because they change and nobody else’s list of them is guaranteed to be current.
Nothing here leaves your device. The browser already knows the name and byte size of a file the moment you select it, and that is all this tool touches. Your documents are not read, not copied and not uploaded.
How to use this tool
- Add the files you are about to upload. Any file type, several at once. Up to 50 MB each and 100 MB in total. Nothing is opened or altered — only the name and the size are read.
- Enter the maximum file size in KB. It starts at 200 KB. Use whatever number the form you are filling gives, per file.
- Choose the required format. “Any format” skips the format test. PDF, JPG / JPEG or PNG check the filename extension against that choice.
- Run it and read the list. Each file gets a PASS or CHECK line, its size against your limit, and a note if the extension does not match. Anything marked CHECK needs fixing before you upload.
What this tool does not do
- The format check reads the filename extension only. It does not inspect file contents and cannot tell a renamed file from a real one.
- It cannot promise a portal will accept anything. It only compares against the numbers you typed in.
- It does not check page count, image dimensions, DPI, colour mode, password protection or scan quality.
- It does not fix anything. Compressing, resizing and splitting are separate tools.
- The size limit applies per file, not to the batch as a whole.
Common questions
How does it decide the format is wrong?
It looks at the letters after the last dot in the filename. That is the entire test. A file called scan.pdf that is really a JPEG someone renamed will pass, and a perfectly valid PDF saved without an extension will not. If you need to know what a file really is, open it.
Does a PASS mean my upload will be accepted?
No. It means the file is within the size number you typed and its extension matches the format you selected. It says nothing about whether that number was the right one, or about page counts, dimensions, scan clarity, colour mode, password protection, or anything else a portal might check. Read the instructions on the site you are applying to and treat this as one box ticked out of several.
Is KB here 1,000 bytes or 1,024?
1,024. A 200 KB limit is 204,800 bytes. Most portals mean the same thing, but if yours is strict and you are within a hair of the line, leave some room.
One of my files is over the limit. What do I do?
For a photo, the compress-to-KB tool works backwards from a size limit. For a PDF that is too big, splitting out only the pages you actually need is usually the fastest fix.
Are my documents read or uploaded?
The contents are never read and nothing is sent anywhere. The tool uses only what the browser already knows about your selection — the filename and the byte count.
Can I check the total size of everything together?
Not directly; the limit is applied to each file on its own, because that is how upload forms usually work. The individual sizes are listed, so you can add them up if your form has a combined cap.