Pick a sheet and press the button. Every page is put on that size with its content scaled to fit and centred, so nothing is cropped and nothing is stretched.
Nothing is re-rendered. Resizing rewrites the page box and a scale factor, which is the same thing your print dialogue does when it says Fit to page, so text stays text and images keep every pixel. A page already at the target is left alone.
Mixed page sizes are the kind of fault nobody notices until the document is in front of someone else. On screen each page fills the window and looks fine. Printed, the margins jump between sheets, a stapler lands in a different place on every page, and a binder shows one page standing proud of the rest.
Where mixed page sizes come from
- Pages merged from different sourcesA4 with Letter
- A scan inserted into an exported documentscanner default
- A file that crossed the AtlanticLetter is 18 mm shorter
- A landscape chart dropped into a portrait reportdeliberate, until it prints
The A4 and Letter case is the one that catches people out, because the two are close enough to look identical. A4 is 8 mm narrower and 18 mm taller. Nothing about a page at the wrong one of those looks wrong, and every print of it is 4 mm out at the top.
How the tool changes the size
Add the PDF
It is read in your browser. Before anything changes, the sizes the document already holds are listed, so you can see what you are dealing with.
Pick the sheet and the orientation
Six sizes. Leaving orientation on Keep gives each page the target in its own orientation, which is what stops a landscape page being forced upright.
Choose fit or sheet only
Fit scales the content to the new sheet and centres it. Sheet only changes the paper and leaves the content exactly where it was.
Download, and read the result line
It says how many pages actually changed and, in sheet-only mode, whether anything now falls outside the paper.
Scale the content, or just change the sheet
This is the only choice on the page that can go wrong, and the two options do genuinely different things.
Scaled by one factor, so nothing is distorted.
Centred, so a shape change becomes even margins.
Nothing is ever cropped.
What a print dialogue's Fit to page does.
Content stays at its original scale.
Line weights and type size are preserved exactly.
Anything past the new edge will not print.
For a document whose measurements have to survive.
The only shrink, never enlarge option matters more than it looks. Fitting an A5 flyer onto A4 enlarges it by 41 per cent, which is usually not what anyone wanted from a tool they opened to make a document consistent. Tick the box and small pages keep their size and simply gain margins.
The page that is a different shape than it says
A PDF page carries two separate facts about its geometry: a box giving its dimensions, and a rotation a reader applies afterwards. A scanner that files a page sideways usually writes a portrait box and a rotation of 90 degrees, so the page is portrait to the file and landscape to everybody looking at it.
So the sizes listed above the button are what a reader sees, not what the box says, and Keep orientation means keep the orientation you can actually see. It is a small thing that is wrong in a surprising amount of software, and it is the difference between a tidy document and one with a page on its side.
Turning a PDF into A4
By far the most common request here is a pdf to a4 conversion, usually because something on the other end will only accept it: a print shop, a submission portal, a binding service, or a colleague in a country where Letter was never the default.
Leave the size on A4, leave orientation on Keep, leave the mode on fit, press the button. A Letter document comes out as A4 scaled by 0.973, which is a change nobody can see, and a mixed document comes out consistent. If the destination is a printer rather than a screen, tick only shrink so a small page is not blown up to fill the sheet.
When resizing is the wrong fix
Three situations look like a page size problem and are not.
- Everything prints small with wide margins. That is usually the print dialogue's own scaling rather than the document, and resizing the file will not change it. Printing problems covers the settings that cause it.
- The content is too close to the edge. Resizing moves the sheet, not the margins inside the content. Fitting onto a larger sheet in fit mode will not open the margins up, because the content scales with the paper.
- The page has huge empty borders. That is a cropping job, not a resizing one. Crop PDF trims the box to what is actually on the page.
And if the document is simply too big in bytes, this is not the tool. Resizing rewrites geometry and leaves the content alone; the file size does move a little, because saving rebuilds the structure, but in whichever direction that rebuild happens to land rather than the one you wanted. Compress PDF is the one for that.
Why this runs in your browser
Documents that need their page size fixed are usually assembled ones: a submission with a scan in it, a report with somebody else's chart, a contract with a signed page photographed and dropped in. Sending that to a server to have a number in each page box rewritten is a poor trade, particularly when the rewriting is arithmetic your machine can do instantly.
So it does. The document is read into memory, the boxes are rewritten, the result is checked by opening it again with the same engine your browser uses, and it is handed back as a download. Nothing is transmitted at any point.
The tool is right above
Six sheet sizes, nothing re-rendered, nothing uploaded. Scroll up and drop the file.
Common questions
What changes, what does not, and what to do instead.
01How do I change a PDF to A4?
Drop it above, leave the size on A4 and press the button. Every page is put on an A4 sheet with its content scaled to fit and centred, so nothing is cropped and nothing is stretched.
02Will resizing blur the pages?
No. Nothing is re-rendered or re-compressed. The content is scaled by a number written into the page, exactly as a print dialogue does it, so text stays vector text and images keep every pixel they had.
03What is the difference between fit and change the sheet only?
Fit scales the content to the new sheet and centres it, which is what almost everybody wants. Change the sheet only leaves the content at its original scale, so line weights are untouched but anything larger than the new sheet falls outside it.
04My document has one landscape page. Will it be turned?
Not unless you ask. Leaving orientation on Keep gives each page the target sheet in its own orientation, so a landscape chart lands on landscape A4 rather than being squeezed onto a portrait one.
05Does it change the file size?
The content is untouched, but saving rewrites the file structure, so the result can come back somewhat smaller or a little larger than it went in. It is not a way to compress a document, and it is not a reason to avoid resizing one.
06Can I resize just some pages?
Not on this page. Split the range out, resize it, and merge it back. Doing it selectively is usually a sign that the document wants two sheet sizes on purpose, which is worth being deliberate about.
07Are my files uploaded anywhere?
No. The document is read and rewritten in your browser. Nothing leaves the device.
08Is it free?
Free. Every tool, unlimited use, no signup.