Convert PDF Page Size
Fit PDF pages onto A4, Letter, Legal, or custom sheets
Convert PDF Page Size — what it does
Fit a PDF's pages onto A4, Letter, Legal or a custom sheet size, choosing portrait or landscape, whether pages are fitted inside or stretched to the sheet, and the margin. It solves the everyday international problem: a document laid out for one paper standard printing badly on another.
When this tool helps
- Converting a US Letter document to A4 for printing outside North America, or the reverse.
- Normalising a merged document whose pages came in several different sizes.
- Fitting oversized pages onto a standard sheet a desktop printer can handle.
How to use it
- Choose the PDF file.
- Select the target page size and orientation.
- Choose fit inside or stretch to page, and set a margin.
- Process and download the converted PDF.
Accuracy, limits, and good practice
- Fit inside preserves proportions and is almost always the right choice; stretching distorts the page to fill a sheet of a different ratio.
- A4 is taller and narrower than Letter, so converting between them always leaves a small band of unused space somewhere.
- Add a margin when the source content runs close to the page edge, or the printer's unprintable border will clip it.
Frequently asked questions
What is the difference between A4 and Letter?
A4 is 210 by 297 millimetres and Letter is 216 by 279 — Letter is wider and shorter, which is why neither fits the other exactly.
Does scaling reduce quality?
Vector content scales cleanly. Embedded images are resampled to the new size, so heavy downscaling can soften them.
Can I convert to a custom size?
Yes, enter custom width and height in points — 72 points to the inch.
Related tools on this site
- PDF Page Border — Draw a customizable border around selected PDF pages
- Pomodoro Timer — Run a focused work timer in your browser
- Resize Image — Change image width and height in your browser
Everything above runs inside this page. Convert PDF Page Size needs no account, no upload, and no server round trip — close the tab and nothing is left behind.
PDF 頁面尺寸轉換能做什麼
把 PDF 頁面套進 A4、Letter、Legal 或自訂紙張尺寸，可選直式或橫式、頁面要「限制在框內」或「拉伸至滿版」，並設定邊界。它解決的是日常的國際問題：為某種紙張標準排版的文件，在另一種標準上印得很糟。
什麼時候用得上
- 把 US Letter 文件轉成 A4 供北美以外地區列印，或反向轉換。
- 統一合併後頁面尺寸不一的文件。
- 把超大頁面縮到桌上型印表機吃得下的標準紙張。
使用步驟
- 選擇 PDF 檔案。
- 選擇目標頁面尺寸與方向。
- 選擇限制在框內或拉伸至滿版，並設定邊界。
- 執行處理並下載轉換後的 PDF。
精確度、限制與實務建議
- 「限制在框內」會維持比例，幾乎永遠是正確選擇；拉伸則會為了填滿不同比例的紙張而讓頁面變形。
- A4 比 Letter 更高更窄，兩者互轉一定會在某處留下一小條未使用的空白。
- 來源內容貼近頁緣時請加邊界，否則會被印表機的不可列印邊緣切掉。
常見問題
A4 與 Letter 差在哪？
A4 是 210 x 297 公釐，Letter 是 216 x 279——Letter 更寬更短，所以兩者互相都塞不剛好。
縮放會降低品質嗎？
向量內容縮放乾淨；內嵌影像會被重新取樣，大幅縮小時可能變柔。
可以轉成自訂尺寸嗎？
可以，以點為單位輸入自訂寬高——一英吋為 72 點。
本站相關工具
以上步驟全部在這個頁面內完成，PDF 頁面尺寸轉換 不需要註冊、不上傳檔案、也不經過伺服器，關閉分頁後不會留下任何資料。