Increase PDF File Size to 100KB Free
This free tool increases a PDF document to exactly 100KB by padding it with invisible data, without changing how the document reads. Choose your file, select 100KB, and download the result — no signup, and no file is uploaded to a server.
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
Confirm the 100KB target
The target is already set to 100KB on this page. You can change it to any other figure in KB or MB if the form you are filling in wants something different.
- 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 100KB. Nothing was uploaded, so there is nothing stored anywhere for you to delete afterwards.
Why you might need this
Plenty of upload forms set a minimum file size as well as a maximum, and reject anything under it. Government portals, visa and examination sites are the usual culprits, and 100KB is one of the figures they ask for most often. A perfectly clear scan that happens to compress well fails the check with no explanation of what is wrong.
The minimum exists to screen out unreadable scans, but it cannot tell an unreadable file from an efficiently compressed one. Padding the file to the size the form wants gets you past the validator without touching a single pixel of the document.
What a 100KB file usually is
100KB is the single most common minimum in upload requirements, and it is the round number specifications reach for when they want "a proper scan, not a thumbnail". Visa applications, professional registration bodies and university admissions portals all use it, often as the floor of a 100KB–200KB band.
A 100KB JPG is roughly 1000×1000 pixels of photographic detail, or a colour scan of an A4 page at around 150 DPI. Documents at this size are comfortably readable, which is what the requirement is trying to guarantee.
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 — often at exactly 100KB. 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.