How to resize a PDF to A4, US Letter or US Legal

The Resize tool rebuilds a PDF onto a standard paper size — A4, US Letter or US Legal — scaling each page to fit without stretching or cropping. It runs 100% in your browser: the PDF never leaves your device, and pages are re-embedded as vectors (not re-rendered to images), so text stays crisp at any zoom.

Typical uses: a US Letter document that needs to print cleanly on A4 paper (or the reverse), or a PDF assembled from mixed sources where every page is a slightly different size.

Before you start

• You need a regular, unencrypted PDF. If the file is password-protected, remove the password first with the Unlock tool — Resize can't open an encrypted file.
• Files up to 100 MB are accepted. For anything larger, split it with the Pages tool first.
• Resize is a free tool with no account required.

Steps

1. Open Resize and drop your PDF onto the drop zone (or click it to pick a file).
2. Choose the target size. Three options are offered as buttons: A4, US Letter, or US Legal. The default is A4.
3. Click Resize PDF. The button shows "Resizing…" while it works; even long documents usually finish in a few seconds because nothing is uploaded.
4. A summary card confirms the result, for example "12 pages resized to A4".
5. Click Download resized PDF. The file is saved next to your original name with the size as a suffix, e.g. report-a4.pdf, report-letter.pdf or report-legal.pdf.
6. Picked the wrong size? Click Try a different size to go back and choose another target without re-dropping the file, or Resize another to start over with a new PDF.

Target sizes

How pages are scaled

• Each page is scaled to fit the target size with its aspect ratio preserved, then centered. Nothing is stretched and no content is cut off — if the source and target shapes differ slightly (Letter and A4 do), you get small even margins instead of distortion.
• Orientation is kept per page. A landscape page becomes a landscape target page, a portrait page becomes portrait — so a mixed portrait/landscape document keeps each page the way it reads.
• Pages that are landscape only because of a stored rotation flag (common in phone scans and faxes) are detected and counter-rotated, so the content lands upright instead of sideways and clipped.
• The rebuild uses vector page embedding, not rasterization — text, lines, and images keep their original quality.

One side effect of rebuilding pages: interactive elements such as fillable form fields and clickable links are not carried into the output. If the document is a form you still need to fill, fill it first in the Fill tool, or flatten it with the Flatten tool so the entered values become part of the page before resizing.

Result

You get a new PDF where every page is exactly the chosen paper size, ready to print without scaling surprises. The original file is untouched, and nothing was uploaded — the whole operation ran in your browser. After the download, a toast offers a one-click Fill it → handoff if you want to add fields or a signature to the result.

Related

• Resize troubleshooting
• How to put multiple PDF pages on one sheet (N-up)
• How to reorder, rotate or split pages