Change PDF Page Size

Put a PDF onto a different sheet — A4, Letter, A3 or a size you type yourself.

Runs on your devicePDFWorkingNo account needed

What this tool does

Change PDF Page Size builds a fresh document whose pages are the size you ask for, then draws each original page onto one of them. The drawing is the page's own content stream, not a picture of it, so text stays selectable and searchable, vector artwork stays sharp at any scale, and embedded images keep the pixels they arrived with rather than being re-encoded.

Six standard sheets are offered — A4, US Letter, A3, A5, US Legal and Tabloid — plus a custom size you enter in millimetres, points or inches. Orientation has three settings. Match each page reads how every source page is actually displayed, including any rotation flag it carries, and lays the sheet on its side for any page that is wider than it is tall, so a report with one landscape table keeps that table landscape; it only ever turns a sheet landscape, so a custom size typed wide stays wide for every page. Portrait and Landscape ignore the source and force the whole document one way.

Two things decide where the content lands. Scale to fit shrinks or enlarges each page to the largest size that fits, keeping its proportions, so nothing is ever stretched; the optional margin, always read in millimetres whatever unit the custom size used, is subtracted first and leaves clear space around the content. Keep the original scale and centre it draws the page at its true dimensions in the middle of the new sheet, which ignores the margin and lets anything wider or taller than the target run off the edge, where a viewer or printer will cut it.

Everything happens in this browser tab through pdf-lib, and the document is not sent anywhere. The limit to weigh before you use it: because the pages are redrawn into a new file, only what is printed on them survives. Links, comments and other annotations, form fields, and the bookmark outline are not carried across, and the title, author, subject and keywords are dropped — the saved file names pdf-lib as its producer instead. If you only want to trim margins rather than move to a different sheet, Crop PDF alters the existing pages in place and leaves the rest of the document untouched.

How to use it

  1. Add your PDF. Add one PDF or a batch of them. Each document is resized on its own with the same settings and comes back with a -resized suffix on its name.
  2. Choose the page size. A4, US Letter, A3, A5, US Legal or Tabloid, or pick Custom and type a width and height in millimetres, points or inches.
  3. Choose the orientation. Match each page follows the source page by page. Portrait and Landscape apply one orientation to the whole document regardless of what came in.
  4. Decide how the content sits. Scale to fit resizes it into the sheet with the proportions kept; keep the original scale centres it untouched. Add a margin in millimetres if the content should not run to the edge — the margin is read by Scale to fit only, and does nothing in the centring mode.
  5. Resize and download. The summary names the sheet you asked for in points — A4 is 595×842 — even when Match each page has turned some of them landscape, and the new PDF downloads from the browser.

Processing & privacy

Runs on your device. Your file is processed directly in this browser.

Common use cases

Making a mixed batch consistent

Scans and exports arrive at whatever size their source used. One pass puts every sheet on A4 so a folder prints and binds as one set.

Sending a document across the Atlantic

A4 is 6 mm narrower and 18 mm taller than US Letter size, which is enough for an American printer to shrink or clip your pages. Convert before you send.

Bringing an A3 drawing down to A4

Plans and posters exported at A3 will not go through an office printer. Scaling to fit keeps the whole drawing on the sheet instead of tiling it.

Leaving room to bind or annotate

A margin of 15 to 20 mm, used with Scale to fit, pulls the content away from the edge, so a punch, a comb binder or a reader's pen has somewhere to go.

Fitting an odd export to a real sheet

Slide decks and design exports often carry sizes no printer stocks. A custom width and height, or a standard sheet with scale to fit, gives it a usable page.

Questions

Is the document sent to a server?
No. The file is read, redrawn and saved inside this browser tab using pdf-lib, which is served from this site and cached after the first run. Nothing about the document is transmitted or stored.
Does changing the page size lose quality?
The page is not rasterised, so text and vector content are re-scaled cleanly at any size. Images are a different matter: they carry a fixed number of pixels, so enlarging a scan from A5 to A3 spreads those same pixels over a larger area and it will look softer in print.
Do links, bookmarks and form fields survive?
No, and this is the sharpest limitation of the tool. Each page is embedded into a new document as drawn content, which leaves behind clickable links, annotations, filled or fillable form fields and the outline pane. Check for those before resizing a document someone else has to interact with.
Why is there white space on two edges?
Because the proportions differ. Scale to fit never stretches or crops — it fits the page inside the new sheet and centres it, so an A4 page placed on Tabloid, or a square page placed on A4, comes back with an even band above and below the content.
Will a smaller page size make the file smaller?
No. The same fonts, images and vector data are still in the file, just drawn at a different scale, so the byte count barely moves — and a small document can even gain a little, because every page is wrapped in an extra object. Compress PDF is the tool for that, since it re-encodes the content rather than changing the sheet.
Can I resize just a few pages?
Not here. The size, orientation and fit settings apply to every page in the document, which is what makes it useful for straightening out a mixed batch. To handle one section differently, split the document first and resize the parts separately.
What about a password-protected file?
It cannot be opened for reading, so the job stops with a message pointing at Unlock PDF. Remove the password there with the one you already hold, then resize the result.

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