PDF Page Size Converter

Change PDF Paper Size to A4, B5, or Letter

PDF Page Size Converter changes each page of a PDF to a selected standard paper size in your browser. It supports A3, A4, A5, B4, B5, Letter, and Legal, making it useful for A4 documents, Letter submissions, B5 manuscripts, and other print-preparation workflows.

Choose Scale or Center Mode

Scale mode resizes page content to fit the target paper size while preserving the aspect ratio. Center mode keeps the original content size and places it in the center of the new page, using white margins where space remains. If the original content is larger than the target paper size, parts of it may fall outside the visible page area.

Use It Before Printing or Sharing

Use this tool when you need to reduce A3 drawings to A4, adapt A4 documents to Letter, or place B5 content on A4 paper. If you only need margin adjustment, use [PDF Crop](/en/pdf/pdf-crop/). For placing multiple pages on one sheet, use [PDF N-Up](/en/pdf/pdf-nup/). To reduce output size after resizing, continue with [PDF Compressor](/en/pdf/pdf-compressor/).

Browser-Side Processing

Processing runs on the browser side, so there is no separate upload step for conversion. Large PDFs and complex drawings may take longer to process. Keep the original PDF and check the converted page size and visible content before using the result.