100% in your browser — files never uploaded
150KB, pre-filled
This page opens Increase PDF Size with the target already set to 150KB, so you can drop your file and download immediately.
A real guarantee, not a target
Unlike compression, padding is deterministic: the tool measures your file's actual byte size and adds exactly enough data to clear 150KB, plus a small margin — the output never lands below your target.
Change the target size
The number field stays fully editable — type any KB value your portal demands, from a few KB up to 50MB.
Increase PDF Size to 150KB, Pre-Filled
This is the Increase PDF Size tool with the target field already set to 150KB. Some upload portals reject files that are too small — flagging them as likely blank or corrupted — and this tool solves that by adding a real, valid PDF attachment object sized to clear the minimum, entirely in your browser.
Why This Is Deterministic, Unlike Compression
Compressing a PDF to a target size depends on page count and image content, so it can only get close. Padding works the opposite direction: the engine measures your file's exact byte size after saving and adds precisely enough random-filler attachment data to clear 150KB plus a small margin — there is no scenario where the target isn't reached.
Editing the Target
The 150KB starting point is only a pre-fill — the number field accepts any target from a few KB up to 50MB, so this same page works for any minimum-size portal requirement, not only 150KB.
Tool family
Base tool: Increase PDF Size in KB
Frequently asked questions
How do I increase a PDF to 150KB?
Drop your PDF here — the target is already set to 150KB. The tool adds a valid PDF attachment object of exactly the right size so your file clears the limit on the first upload attempt.
Does padding change how the PDF looks or reads?
No. The visible pages are untouched — the added data is a separate embedded attachment object, invisible when the PDF is opened or printed.
Is this guaranteed to work, unlike compression targets?
Yes — padding is arithmetic, not lossy re-encoding. The output is measured after saving and always lands at or just above 150KB.
Can I target a different size than 150KB?
Yes — the target field is pre-filled but stays fully editable to any KB value.
Related tools
Increase PDF Size in KB
Pad your PDF to an exact minimum size for portals that reject files below a KB limit — processed privately on your device.
OpenCompress PDF
Shrink your PDF with a quality preset or compress to an exact target size — processed privately on your device.
OpenMerge PDF
Drop PDFs, set the order, download one combined file — nothing ever uploads.
Open