Resize any PDF to A4 (210x297mm) paper size free. Scale content to fit perfectly. Ideal for printing standardization. No signup, no watermark.

Documents created in different countries or on different systems use different default page sizes. US Letter (8.5" × 11") and A4 (210 × 297mm) are the most common — and a US Letter PDF printed on European A4 paper has awkward margins or cut-off content without resizing. ## How to Resize PDF to A4 1. Open [pdfhub24.com/resize-pdf](/resize-pdf) 2. Upload your PDF 3. Select **A4** as the target page size 4. Choose whether to scale content to fit (recommended) or keep content at original size 5. Download the resized PDF ## Scale Content vs Maintain Content Size **Scale content to fit:** The content scales up or down proportionally to fill the new page size. Best for most purposes — the document looks natural on A4 paper. **Maintain content size:** The content stays at its original size, positioned on the new page size. This may leave larger margins or cut off content depending on which direction you're resizing. ## Common Resizing Scenarios **US Letter to A4:** US Letter (8.5" × 11") is very close to A4 in area but slightly wider and shorter. Content scales almost imperceptibly. This is the most common resize request. **Legal to A4:** US Legal (8.5" × 14") is taller than A4. Scaling down loses some size — suitable for printing but text becomes slightly smaller. **A3 to A4:** Reduces the document to half its original size. Content becomes smaller but everything remains proportional. ## When Resizing Doesn't Fully Solve the Problem If a document was designed specifically for a different page size — with content positioned precisely relative to that size — resizing might produce layout oddities. For documents that really need to be designed for A4, the cleanest solution is to recreate them in A4 from source, convert the source to PDF, and use the result. For display-only purposes (reading on screen, emailing), the resized version works fine.