Resize PDF page size
Resize a PDF to A4 size — or Letter, Legal, A5 or A3 — to get a clean, consistent, print-ready document. A free PDF to A4 converter that runs instantly, 100% in your browser.
Every page is scaled to fit the chosen page size, centred and keeping its proportions.
Resize your PDF in 3 simple steps
Pick a page size
Choose A4, Letter, Legal, A5 or A3 as your target size.
Upload your PDF
Drop your file — it stays on your device and is never uploaded.
Download
Every page is scaled to fit and you download the resized PDF.
Why use this PDF resizer
Standard sizes
Fit every page to A4, Letter, Legal, A5 or A3 in one click.
No distortion
Each page keeps its aspect ratio — content is centred, never stretched.
Print-ready
Standardise mixed page sizes so the document prints and uploads cleanly.
100% private
Runs entirely in your browser; your PDF is never uploaded to a server.
Instant
Resize even a multi-page PDF in seconds — no queue, no waiting.
Free & unlimited
No sign-up, no watermark and no file-size cap.
Standardise your PDF page size
PDFs assembled from scans and photos often end up with mixed or unusual page sizes, which can print badly or be rejected by upload portals. This tool resizes every page to a standard size — A4 is the default in most countries — scaling each page to fit while keeping its proportions, so nothing is stretched.
To change a PDF to A4 size, just pick A4 and upload your file: the tool fits each page to A4 the way a PDF to A4 converter does, then gives you the resized PDF to download. It works equally well to adjust a PDF to A4 for a form portal or simply to standardise the size before printing — and it is completely free.
Resizing changes the page dimensions; to reduce the file weight for an upload limit, use Compress PDF or a target like 200 KB. You can also merge, split and do more with the full PDF toolkit — all in your browser.