PDF 文件版本

Curtis Chau

Updated: 2026年4月22日

如何更改 PDF 版本？

PDF 版本標籤設定會根據您建立 PDF 時使用的功能。

例如：

若未使用任何高級功能的基本 PDF，版本可能是 1.4
新增高級功能（例如圖層）將使版本標籤更新為 1.7
從 PDF 中移除圖層會將版本標籤改回 1.4

PDF 建立工具會始終嘗試使用最低的 PDF 版本來提高相容性。

然而，一個可以將 PDF 文件版本從 1.4 更改為 1.7 的技巧是在 IronPDF 中使用 PdfDocument.Merge() 靜態方法和 PdfDocument.RemovePage() 方法結合。下面的程式碼片段展示了如何完成這一點：

using IronPdf;

var renderer = new ChromePdfRenderer();

// Render the initial PDF that needs its version changed.
var pdf1 = renderer.RenderHtmlAsPdf("<h1>Hello, this is the required PDF</h1>");

// Render a mock PDF to use with the Merge() method.
var pdf2 = renderer.RenderHtmlAsPdf("<h1>This is a mock PDF</h1>");

// Merge the two PDFs. This will update the version to 1.7 if new features from pdf2 are used.
var pdf3 = PdfDocument.Merge(pdf1, pdf2);

// Remove the page from the mock PDF, keeping only the original content.
var pdf4 = pdf3.RemovePage(1);

// Save the resulting PDF document. It should have a version updated to 1.7.
pdf4.SaveAs("anothermerged.pdf");

using IronPdf;

var renderer = new ChromePdfRenderer();

// Render the initial PDF that needs its version changed.
var pdf1 = renderer.RenderHtmlAsPdf("<h1>Hello, this is the required PDF</h1>");

// Render a mock PDF to use with the Merge() method.
var pdf2 = renderer.RenderHtmlAsPdf("<h1>This is a mock PDF</h1>");

// Merge the two PDFs. This will update the version to 1.7 if new features from pdf2 are used.
var pdf3 = PdfDocument.Merge(pdf1, pdf2);

// Remove the page from the mock PDF, keeping only the original content.
var pdf4 = pdf3.RemovePage(1);

// Save the resulting PDF document. It should have a version updated to 1.7.
pdf4.SaveAs("anothermerged.pdf");

Imports IronPdf

Private renderer = New ChromePdfRenderer()

' Render the initial PDF that needs its version changed.
Private pdf1 = renderer.RenderHtmlAsPdf("<h1>Hello, this is the required PDF</h1>")

' Render a mock PDF to use with the Merge() method.
Private pdf2 = renderer.RenderHtmlAsPdf("<h1>This is a mock PDF</h1>")

' Merge the two PDFs. This will update the version to 1.7 if new features from pdf2 are used.
Private pdf3 = PdfDocument.Merge(pdf1, pdf2)

' Remove the page from the mock PDF, keeping only the original content.
Private pdf4 = pdf3.RemovePage(1)

' Save the resulting PDF document. It should have a version updated to 1.7.
pdf4.SaveAs("anothermerged.pdf")

Imports IronPdf

Private renderer = New ChromePdfRenderer()

' Render the initial PDF that needs its version changed.
Private pdf1 = renderer.RenderHtmlAsPdf("<h1>Hello, this is the required PDF</h1>")

' Render a mock PDF to use with the Merge() method.
Private pdf2 = renderer.RenderHtmlAsPdf("<h1>This is a mock PDF</h1>")

' Merge the two PDFs. This will update the version to 1.7 if new features from pdf2 are used.
Private pdf3 = PdfDocument.Merge(pdf1, pdf2)

' Remove the page from the mock PDF, keeping only the original content.
Private pdf4 = pdf3.RemovePage(1)

' Save the resulting PDF document. It should have a version updated to 1.7.
pdf4.SaveAs("anothermerged.pdf")

您可以檢查結果 PDF 輸出的 PDF 版本。

另一方面，您_也可以_手動更改 PDF 中的版本標籤，例如從 1.4 更改為 2.0，但這只是標籤，並不會以任何實質方式改變 PDF 本身。