How big a file can I use?

Up to 100 MB per file and 50 files per batch. There is no server queue behind that limit; the practical ceiling is your browser's memory, so split unusually large documents into two runs.

Where does the processing actually happen?

In this tab. The file is read locally, converted or edited locally, and handed back as a download — no copy is sent to a server, so there is nothing for anyone to breach or keep.

Will it work on a phone?

Yes. The layout adapts to a small screen and the processing runs in the mobile browser, so a photo or a downloaded document can be handled on the device it arrived on.

Because the expensive part — the server farm — does not exist. Processing runs on your device, so the site can stay free without a signup wall in front of it or an upsell in the middle of a job.

PDF File Size Checker

See exact size and what a new size target means.

Drop PDFs to measure

Sizes are read from the file itself — nothing is uploaded

Per-page numbers for short documents are produced by actually re-saving each page alone, so they reflect real object weight — not a size divided by page count.

Add a PDF first.

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About PDF File Size Checker

PDF File Size Checker is here for answering a question about a file rather than converting it: see exact size and what a new size target means. The answer is shown on the page — there is no converted file to download. Nothing is sent anywhere: the browser reads the file, does the work and hands the result back.

The slow route to answering a question about a file rather than converting it is installing something, making an account and uploading the file; this is the fast route.

How to use PDF File Size Checker in 3 steps

Start by dropping the PDF you want to work on; the limit is 100 MB per file.
Set a target size, to see how far the file is from it.
Press Measure sizes and read the answer on the screen; nothing leaves your device to be computed.

What you get with PDF File Size Checker

Answers on the page, with no file to open afterwards
Runs in your browser — the file is never uploaded
Free to use, with no signup and no account
No watermark or logo added to your output
Works on desktop and mobile, no install

PDF File Size Checker: questions

How big a file can I use?: Up to 100 MB per file and 50 files per batch. There is no server queue behind that limit; the practical ceiling is your browser's memory, so split unusually large documents into two runs.
Where does the processing actually happen?: In this tab. The file is read locally, converted or edited locally, and handed back as a download — no copy is sent to a server, so there is nothing for anyone to breach or keep.
Will it work on a phone?: Yes. The layout adapts to a small screen and the processing runs in the mobile browser, so a photo or a downloaded document can be handled on the device it arrived on.
Why is it free?: Because the expensive part — the server farm — does not exist. Processing runs on your device, so the site can stay free without a signup wall in front of it or an upsell in the middle of a job.