Make every page the same size — A4, Letter, or the content’s own edge

There are two different problems here

Changing size can mean making every page the same physical dimensions, or it can mean making the content fill a consistent area. They’re different operations, and a tool that does one doesn’t do the other.

Changing the paper size isn’t possible without resizing the content. You can’t draw an A4 page on Letter stock without either scaling what’s on the page or leaving a margin. What a page-box tool can do is set the boundary every page displays, which fixes mixed dimensions without touching a single glyph.

What this tool does with a page size

It writes the CropBox, the visible boundary, and leaves the content where it is. Set the same box on every page and they all display at the same size. Anything the content had outside the box is still in the file but no longer shown.

That solves mixed dimensions for display, printing and most submission systems. It doesn’t rescale content, so a page whose text was laid out for a larger sheet will show the same size text with a wider margin, rather than the text growing to fill the new boundary.

Uniform margin is the tool for mixed sources. Untick apply-to-all, then set a uniform margin on each page. That trims each page to its own content plus a consistent border, which is what makes an assembled document look deliberate rather than patched.

What it can’t do

Scale content to a new page size: Not possible here. Crop changes the boundary, not the size of what is drawn.
Add a margin where there’s none: Only within the existing page. You can’t extend a boundary past the original MediaBox into empty space the file doesn’t contain.
Pad a page out to A4: Not as such. If the original page is smaller than A4, the boundary can’t be pushed beyond the page itself.
Rotate a sideways page: That’s the organize tool, which rotates pages rather than changing their boundary.
Straighten a skewed scan: No tool on this site does this. A skew is a property of the pixels, and correcting it needs resampling.

The check before you send it anywhere

Open the exported file and page through it, watching the page size indicator in your reader. It’s usually shown as a tooltip or in the status bar, and it should report the same dimensions on every page.

Then check the last page and the first. If a mixed document had an outlier, it’s nearly always one of those two: a cover sheet laid out differently, or an appendix inserted from elsewhere.

If the size change has to be real

Some systems don’t just display a page, they measure it. A print workflow that imposes pages onto sheets, or a portal that validates dimensions, may reject a file whose pages are still nominally different sizes even if they display identically.

There’s no way round this with a boundary change, and the honest options are to ask the recipient whether it matters, or to accept that producing genuinely uniform pages means re-laying-out the content. For a mixed document, a better fix is usually to rebuild it from consistent sources rather than to convert the assembled result.

Test with the recipient’s system, not with your reader. Everything looks uniform in a PDF reader because readers respect the boundary. If the destination measures the page, that’s the only test that matters, and it’s worth running it on one file before converting a batch.

Straight answers

Will this resize the text to fit A4?

No. It sets the visible boundary on every page. Text stays at the size it was drawn, so a page laid out for a larger sheet shows more margin rather than larger text.

Can I make a small page bigger?

Not beyond the page itself. The boundary can’t be pushed outside the area the file already defines, so you can’t pad a small page out to A4 by cropping.

The document has one landscape page. What happens?

Cropping doesn’t rotate anything, so a landscape page cropped with a portrait box will show a narrow slice of its content. Set that page on its own, or rotate it first with the organize tool.

Does the print size change too?

Yes, because the printer sees the boundary, so what prints is what the box shows. That’s usually the point, and it’s also why a crop that’s too tight shows up as clipped content on paper.

Is this reversible?

Yes, and this is the one thing that distinguishes it from redaction. Reset to full page restores the boundary, and the content was never changed. A redacted page can’t be restored from the exported file.

Get every page to the same size

Drop the PDF you want to crop

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Crop settings