Resize PDF

Resize PDF pages to a standard paper size — A4, US Letter, A5, or A3 — without desktop software. Documents assembled from different sources rarely match: one file was made in the US on Letter, another in Europe on A4, a third exported at some odd custom size. PDFora rescales every page to the size you pick, with the content scaled and centered so nothing gets chopped off. It all runs in your browser with local processing; the file is never uploaded.

This solves a stubbornly practical problem. Print a Letter-sized PDF on A4 paper and the printer either shrinks it unpredictably or clips the edges. Merge mixed-size pages into one file and the result looks ragged in every viewer. Converting the whole document to a single target size — an A4 PDF for European printing, Letter for the US — makes it behave the same everywhere.

PDFora is free with no signup, no watermarks on your output, and no limit on files or pages. Because the resizing happens on your own machine, a 300-page mixed-format archive converts in the time other sites spend just uploading it.

How to resize PDF pages online

1. Open the resize tool on getpdfora.com and drop in the PDF you want to standardize.
2. Choose the target paper size: A4, US Letter, A5, or A3.
3. Confirm your choice — every page in the document will be converted to that one size.
4. Let the tool rescale the content. Each page is scaled to fit and centered on the new sheet, so proportions are preserved.
5. Processing runs locally in your browser, so there is no upload step and no waiting on a server queue.
6. Download the resized PDF and check a couple of pages before sending it to print.

When to use this tool

• Convert a US Letter contract to an A4 PDF before printing it in Europe, Asia, or anywhere else A4 is the office standard.
• Standardize a merged document whose chapters came from different tools and countries, so every page is the same size.
• Scale a report up to A3 for a review meeting where reviewers want to mark up large-format printouts.
• Shrink a document to A5 to produce a compact booklet-style reading copy.
• Fix scans captured at odd, non-standard dimensions so they print edge-accurate on normal paper.
• Prepare files for a print shop that quotes by standard sheet size and rejects mixed-format PDFs.

Tips for the best results

• Match the target size to the paper actually in the destination printer — A4 for most of the world, US Letter for North America — and printing headaches largely disappear.
• Content is scaled proportionally and centered, so a Letter page moved to A4 gains small margins on some edges rather than being stretched or distorted.
• Resize before adding page numbers, headers, or watermarks, so those elements are placed against the final page dimensions.
• Going from A4 down to A5 halves the sheet area; check that footnotes and fine print are still comfortably readable at the smaller size.
• Keep your original file untouched as a master. The tool never alters it, so you can produce an A4 version today and an A3 version tomorrow from the same source.