Increase PDF File Size Online Free
This free tool increases a PDF document to any size you need — 100KB, 200KB, 2MB or a figure you type — by padding it with invisible data that leaves the document untouched. Everything runs in your browser, so nothing is uploaded.
Increase PDF file size
Runs entirely in this browser tab. Your file is never uploaded.
Drag a PDF file here, or
Nothing is uploaded when you pick a file.
How it works
- 1
Choose your PDF file
Drag a file onto the tool above or click to browse. It accepts .pdf files, and the file is read directly by your browser rather than sent anywhere.
- 2
Set your target size
Pick a preset from the dropdown or type an exact figure in KB or MB. The output will match that number byte for byte.
- 3
Choose how the size is added
The default pads the file with an inert stream object that no page references, which PDF readers pass over, so the document is untouched. Switch to "increase resolution" if you want more pixels as well as more bytes.
- 4
Download the result
Press the button and your browser saves the new file at exactly the size you asked for. Nothing was uploaded, so there is nothing stored anywhere for you to delete afterwards.
Why you might need this
Size floors turn up in the places with the most paperwork and the least flexibility. Immigration services, examination boards, professional registration bodies and bank onboarding forms all use them, and none of them will explain which end of the range you failed.
Because efficient compression is what causes the problem, the answer is not to make a worse document. Adding padding leaves the pages exactly as they are, which is what the validator wanted all along.
What controls a PDF’s size
Almost all of a PDF’s weight comes from embedded images and fonts. A PDF exported straight from a word processor holds real text and a subsetted font, and can be a couple of hundred kilobytes for dozens of pages. The same document scanned as images can be several megabytes for one page.
That is why PDF minimums catch people out: a properly produced, text-based PDF is small precisely because it was made well. Padding adds an inert stream object, referenced from the document catalog under a private key, which readers pass over without rendering anything.
Frequently asked questions
Will this reduce my PDF’s quality?
It cannot. Quality is only ever lost when a file is decoded and re-compressed, and this tool does neither — it writes an inert stream object that no page references, which PDF readers pass over and leaves the pages exactly as it found them. Open the original and the result side by side and they are indistinguishable, because they are.
Is my file uploaded to a server?
Never. This site has no route that accepts a visitor file at all. Everything happens inside the browser tab you are reading this in, which is why it costs nothing to run and why a passport scan or bank statement is as safe here as it is in your own file manager.
What file formats are supported?
This page is set up for PDF documents. The tool also handles JPG and PNG images — drop any supported file in and it will detect the type from the file itself rather than the extension.
Why would I need to increase file size instead of decrease it?
Minimum size rules exist because file size is the cheapest available proxy for "is this scan readable". A form cannot easily judge legibility, so it judges bytes. Modern compression is good enough that a perfectly clear document lands under the threshold, and then the only thing wrong with it is the number.
Is this free to use?
Yes — free, with no account, no watermark, no email address and no limit on how many files you run through it. Because the work happens on your own device rather than on a server, there are no processing costs to pass on.