Page size
Page size changes the sheet format of every page, to A4, A3, A5, Letter or Legal. It works both for switching the format of a whole document and for unifying a PDF whose pages came from different sources and are not all the same size. The content of each page is not rescaled: only the sheet changes. All processing runs in your browser.
Three steps, nothing to install.
The whole job happens on your computer, start to finish.
Choose the file
Drag the PDF into the tool window, or click to pick it.
Pick the format
A4, A3, A5, Letter or Legal. It is the format every page is going to get.
Apply and download
Get the PDF with the new format on every page.
Does changing the size rescale what is written on the page?
No, and this is the most important thing to know about this tool. It only changes the sheet size (what the PDF format calls the MediaBox), keeping the content exactly where it was, measured from the same corner. An A4 document set to Letter, which is narrower and shorter, ends up with its right and bottom margins outside the visible area; set to A3, which is bigger, it ends up with a blank strip of paper around it. For the content to adjust itself, every element on the page would need to be rescaled, and that is a transformation that changes the look of the document in a way this tool is not meant to decide on its own.
So what is it for, if it does not adjust the content?
Two concrete cases. One: switching the print format of a document meant for a different sheet, knowing the margins may need reviewing afterwards. Two, and the more common one: unifying a PDF with pages of different sizes (the result of merging several files, for example), so all of them end up with the same format, even though the content of each one stays in its original spot.
Does this change the text, the images or the form fields?
No. Nothing inside the page is touched: text stays text, images stay where they were, forms keep working. Only the sheet around all of that changes size.
I picked A3 and the content came out small, stuck in a corner.
That is the expected behaviour, not a bug. The content keeps its original size and position; switching to a bigger sheet leaves blank paper around it. If the goal was to enlarge the content to fill the new sheet, this tool does not do that: it would require rescaling the page drawing, which is a different operation.
I picked a smaller format and lost part of the text.
Same logic in reverse: content that fell outside the new sheet's limits stops being in the visible area. Before shrinking the format of a document with text close to the margins, it is worth checking whether the content fits the target format.
Did the file get bigger or smaller after changing the size?
The file weight does not change in any meaningful way: nothing is added or removed, only a geometric value per page is changed. If the goal is a smaller file, the right tool is Compress PDF.
Questions about page size.
Do I need an account to change the page size?
Yes. The account (magic link, no password) is needed for the subscription. This tool is part of the Premium subscription, EUR 1.99 a month, which removes the limits on every tool and adds OCR. Sign PDF opens on the free plan, with one signature a day.
Can I pick a different format for each page?
No. The chosen format applies to every page of the document at once.
Does it work for unifying a PDF with pages of different sizes?
Yes, that is one of the two main uses of this tool. Every page ends up with the same format, each one keeping its content where it was.
Are my files kept on your servers?
No. Since nothing is sent, nothing is kept outside your browser.
Pages with mixed
formats? Unify them.
Open the tool and try it. Nothing to install, nothing sent anywhere.
Open Page size