gpdf-dev · taiki-nd · Mar 23, 2026 · Mar 23, 2026 · Mar 23, 2026 · Mar 23, 2026
diff --git a/.github/ISSUE_TEMPLATE/bug_report.yml b/.github/ISSUE_TEMPLATE/bug_report.yml
@@ -63,7 +63,7 @@ body:
     id: gpdf-version
     attributes:
       label: gpdf Version
-      placeholder: "v1.0.0"
+      placeholder: "v1.0.2"
     validations:
       required: true
 

diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -7,6 +7,17 @@ and this project adheres to [Semantic Versioning](https://semver.org/).
 
 ## [Unreleased]
 
+## [1.0.2] - 2026-03-23
+
+### Added
+- PDF document merging — combine pages from multiple PDFs into one (#11)
+  - `pdf.MergePDFs()`: Core merge engine with object reference remapping
+  - `gpdf.Merge()`: High-level facade with `Source`, `PageRange`, `WithMergeMetadata()`
+  - `pdf.Writer.AddRawPage()`, `PageTreeRef()`: Raw page insertion support
+  - Merge examples: basic merge, page range extraction, metadata, merge + overlay, issue #11 scenario
+
+## [1.0.0] - 2026-03-20
+
 ### Added
 - Existing PDF overlay — open, read, and modify existing PDFs
   - `pdf.Reader`: PDF parser with XRef table/stream parsing, page tree traversal, object caching
@@ -91,8 +102,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/).
 - Reed-Solomon coefficient order in QR code encoder
 - binary.Write return value handling for errcheck lint
 
-[Unreleased]: https://github.com/gpdf-dev/gpdf/compare/v1.0.0...HEAD
-[0.9.0]: https://github.com/gpdf-dev/gpdf/compare/v0.8.0...v1.0.0
+[Unreleased]: https://github.com/gpdf-dev/gpdf/compare/v1.0.2...HEAD
+[1.0.2]: https://github.com/gpdf-dev/gpdf/compare/v1.0.0...v1.0.2
+[1.0.0]: https://github.com/gpdf-dev/gpdf/compare/v0.9.0...v1.0.0
+[0.9.0]: https://github.com/gpdf-dev/gpdf/compare/v0.8.0...v0.9.0
 [0.8.0]: https://github.com/gpdf-dev/gpdf/compare/v0.5.0...v0.8.0
 [0.7.0]: https://github.com/gpdf-dev/gpdf/releases/tag/v0.7.0
 [0.6.0]: https://github.com/gpdf-dev/gpdf/releases/tag/v0.6.0

diff --git a/README.md b/README.md
@@ -2,7 +2,7 @@
 
 [![Go Reference](https://pkg.go.dev/badge/github.com/gpdf-dev/gpdf.svg)](https://pkg.go.dev/github.com/gpdf-dev/gpdf)
 [![CI](https://github.com/gpdf-dev/gpdf/actions/workflows/check-code.yml/badge.svg)](https://github.com/gpdf-dev/gpdf/actions/workflows/check-code.yml)
-![coverage](https://img.shields.io/badge/coverage-86.8%25-green)
+![coverage](https://img.shields.io/badge/coverage-86.5%25-green)
 [![Go Report Card](https://goreportcard.com/badge/github.com/gpdf-dev/gpdf)](https://goreportcard.com/report/github.com/gpdf-dev/gpdf)
 [![Go Version](https://img.shields.io/badge/Go-%3E%3D1.22-blue)](https://go.dev/)
 [![Website](https://img.shields.io/badge/Website-gpdf.dev-blue)](https://gpdf.dev/)
@@ -33,6 +33,7 @@ A pure Go, zero-dependency PDF generation library with a layered architecture an
 - **Images** — JPEG and PNG embedding with fit options
 - **Absolute positioning** — place elements at exact XY coordinates on the page
 - **Existing PDF overlay** — open existing PDFs and add text, images, stamps on top
+- **PDF merging** — combine multiple PDFs into one with page range selection
 - **Document metadata** — title, author, subject, creator
 - **Encryption** — AES-256 encryption (ISO 32000-2, Rev 6) with owner/user passwords and permissions
 - **PDF/A** — PDF/A-1b and PDF/A-2b conformance with ICC profiles and XMP metadata
@@ -498,6 +499,22 @@ doc.EachPage(func(i int, p *template.PageBuilder) {
 result, _ := doc.Save()
 ```
 
+### PDF Merging
+
+Combine multiple PDFs into a single document with optional page range selection:
+
+```go
+// Merge multiple PDFs
+merged, _ := gpdf.Merge(
+	[]gpdf.Source{
+		{Data: coverPage},
+		{Data: report},
+		{Data: appendix, Pages: gpdf.PageRange{From: 1, To: 3}}, // only first 3 pages
+	},
+	gpdf.WithMergeMetadata("My Document", "Author", ""),
+)
+```
+
 ### JSON Schema
 
 Define documents entirely in JSON:
@@ -780,6 +797,8 @@ doc.Render(f)
 | `doc.Overlay(page, fn)` | Add content on top of a specific page |
 | `doc.EachPage(fn)` | Apply overlay to every page |
 | `doc.Save()` | Save the modified PDF |
+| `gpdf.Merge(sources, opts...)` | Merge multiple PDFs into one |
+| `WithMergeMetadata(title, author, producer)` | Set metadata on merged output |
 
 ### Text Options
 

diff --git a/README_es.md b/README_es.md
@@ -32,6 +32,7 @@ Biblioteca de generación de PDF en Go puro, sin dependencias externas, con arqu
 - **Imágenes** — incrustación de JPEG y PNG con opciones de ajuste
 - **Posicionamiento absoluto** — colocar elementos en coordenadas XY exactas en la página
 - **Superposición de PDF existente** — abrir PDFs existentes y agregar texto, imágenes, sellos encima
+- **Fusión de PDF** — combinar múltiples PDFs en uno con selección de rango de páginas
 - **Metadatos del documento** — título, autor, asunto, creador
 - **Encriptación** — encriptación AES-256 (ISO 32000-2, Rev 6) con contraseñas de propietario/usuario y permisos
 - **PDF/A** — conformidad PDF/A-1b y PDF/A-2b con perfiles ICC y metadatos XMP
@@ -415,6 +416,22 @@ doc.EachPage(func(i int, p *template.PageBuilder) {
 result, _ := doc.Save()
 ```
 
+### Fusión de PDF
+
+Combine múltiples PDFs en un solo documento con selección opcional de rango de páginas:
+
+```go
+// Fusionar múltiples PDFs
+merged, _ := gpdf.Merge(
+	[]gpdf.Source{
+		{Data: coverPage},
+		{Data: report},
+		{Data: appendix, Pages: gpdf.PageRange{From: 1, To: 3}}, // solo las primeras 3 páginas
+	},
+	gpdf.WithMergeMetadata("My Document", "Author", ""),
+)
+```
+
 ### Metadatos del documento
 
 ```go
@@ -519,6 +536,8 @@ doc.Render(f)
 | `doc.Overlay(page, fn)` | Superponer contenido en una página específica |
 | `doc.EachPage(fn)` | Aplicar superposición a todas las páginas |
 | `doc.Save()` | Guardar el PDF modificado |
+| `gpdf.Merge(sources, opts...)` | Fusionar múltiples PDFs en uno |
+| `WithMergeMetadata(title, author, producer)` | Establecer metadatos en la salida fusionada |
 
 ### Opciones de texto
 

diff --git a/README_ja.md b/README_ja.md
@@ -32,6 +32,7 @@
 - **画像** — JPEGとPNGの埋め込み（フィットオプション対応）
 - **絶対位置指定** — ページ上の任意のXY座標に要素を配置
 - **既存PDFオーバーレイ** — 既存PDFを開いてテキスト、画像、スタンプを上に追加
+- **PDFマージ** — 複数のPDFをページ範囲指定付きで1つに結合
 - **ドキュメントメタデータ** — タイトル、著者、件名、作成者
 - **暗号化** — AES-256暗号化（ISO 32000-2, Rev 6）、オーナー/ユーザーパスワードと権限制御
 - **PDF/A** — PDF/A-1bおよびPDF/A-2b準拠、ICCプロファイルとXMPメタデータ対応
@@ -424,6 +425,22 @@ doc.EachPage(func(i int, p *template.PageBuilder) {
 result, _ := doc.Save()
 ```
 
+### PDFマージ
+
+複数のPDFをページ範囲指定付きで1つのドキュメントに結合:
+
+```go
+// 複数のPDFを結合
+merged, _ := gpdf.Merge(
+	[]gpdf.Source{
+		{Data: coverPage},
+		{Data: report},
+		{Data: appendix, Pages: gpdf.PageRange{From: 1, To: 3}}, // 最初の3ページのみ
+	},
+	gpdf.WithMergeMetadata("My Document", "Author", ""),
+)
+```
+
 ### JSONスキーマ
 
 JSONのみでドキュメントを定義:
@@ -638,6 +655,8 @@ doc.Render(f)
 | `doc.Overlay(page, fn)` | 特定ページにコンテンツを重ねて配置 |
 | `doc.EachPage(fn)` | 全ページにオーバーレイを適用 |
 | `doc.Save()` | 変更したPDFを保存 |
+| `gpdf.Merge(sources, opts...)` | 複数のPDFを1つに結合 |
+| `WithMergeMetadata(title, author, producer)` | 結合後のメタデータを設定 |
 
 ### テキストオプション
 

diff --git a/README_ko.md b/README_ko.md
@@ -32,6 +32,7 @@
 - **이미지** — JPEG 및 PNG 임베딩 (맞춤 옵션 지원)
 - **절대 위치 지정** — 페이지의 정확한 XY 좌표에 요소 배치
 - **기존 PDF 오버레이** — 기존 PDF를 열어 텍스트, 이미지, 스탬프를 위에 추가
+- **PDF 병합** — 여러 PDF를 페이지 범위 선택으로 하나로 결합
 - **문서 메타데이터** — 제목, 저자, 주제, 작성자
 - **암호화** — AES-256 암호화 (ISO 32000-2, Rev 6), 소유자/사용자 비밀번호 및 권한 제어
 - **PDF/A** — PDF/A-1b 및 PDF/A-2b 준수, ICC 프로파일 및 XMP 메타데이터 포함
@@ -415,6 +416,22 @@ doc.EachPage(func(i int, p *template.PageBuilder) {
 result, _ := doc.Save()
 ```
 
+### PDF 병합
+
+여러 PDF를 페이지 범위 선택으로 하나의 문서로 결합:
+
+```go
+// 여러 PDF 합치기
+merged, _ := gpdf.Merge(
+	[]gpdf.Source{
+		{Data: coverPage},
+		{Data: report},
+		{Data: appendix, Pages: gpdf.PageRange{From: 1, To: 3}}, // 처음 3페이지만
+	},
+	gpdf.WithMergeMetadata("My Document", "Author", ""),
+)
+```
+
 ### 문서 메타데이터
 
 ```go
@@ -519,6 +536,8 @@ doc.Render(f)
 | `doc.Overlay(page, fn)` | 특정 페이지에 콘텐츠 오버레이 |
 | `doc.EachPage(fn)` | 모든 페이지에 오버레이 적용 |
 | `doc.Save()` | 수정된 PDF 저장 |
+| `gpdf.Merge(sources, opts...)` | 여러 PDF를 하나로 병합 |
+| `WithMergeMetadata(title, author, producer)` | 병합된 출력의 메타데이터 설정 |
 
 ### 텍스트 옵션
 

diff --git a/README_pt.md b/README_pt.md
@@ -32,6 +32,7 @@ Biblioteca de geração de PDF em Go puro, sem dependências externas, com arqui
 - **Imagens** — incorporação de JPEG e PNG com opções de ajuste
 - **Posicionamento absoluto** — posicionar elementos em coordenadas XY exatas na página
 - **Sobreposição de PDF existente** — abrir PDFs existentes e adicionar texto, imagens, carimbos por cima
+- **Fusão de PDF** — combinar múltiplos PDFs em um com seleção de intervalo de páginas
 - **Metadados do documento** — título, autor, assunto, criador
 - **Criptografia** — criptografia AES-256 (ISO 32000-2, Rev 6) com senhas de proprietário/usuário e permissões
 - **PDF/A** — conformidade PDF/A-1b e PDF/A-2b com perfis ICC e metadados XMP
@@ -466,6 +467,22 @@ doc.EachPage(func(i int, p *template.PageBuilder) {
 result, _ := doc.Save()
 ```
 
+### Fusão de PDF
+
+Combine múltiplos PDFs em um único documento com seleção opcional de intervalo de páginas:
+
+```go
+// Fundir múltiplos PDFs
+merged, _ := gpdf.Merge(
+	[]gpdf.Source{
+		{Data: coverPage},
+		{Data: report},
+		{Data: appendix, Pages: gpdf.PageRange{From: 1, To: 3}}, // apenas as primeiras 3 páginas
+	},
+	gpdf.WithMergeMetadata("My Document", "Author", ""),
+)
+```
+
 ## Referência API
 
 ### Opções do documento
@@ -519,6 +536,8 @@ result, _ := doc.Save()
 | `doc.Overlay(page, fn)` | Sobrepor conteúdo em uma página específica |
 | `doc.EachPage(fn)` | Aplicar sobreposição em todas as páginas |
 | `doc.Save()` | Salvar o PDF modificado |
+| `gpdf.Merge(sources, opts...)` | Fundir múltiplos PDFs em um |
+| `WithMergeMetadata(title, author, producer)` | Definir metadados na saída fundida |
 
 ### Opções de texto
 

diff --git a/README_zh.md b/README_zh.md
@@ -32,6 +32,7 @@
 - **图片** — JPEG 和 PNG 嵌入（支持缩放选项）
 - **绝对定位** — 在页面上以精确 XY 坐标放置元素
 - **现有 PDF 叠加** — 打开现有 PDF 并在上面添加文字、图片、印章
+- **PDF 合并** — 将多个 PDF 合并为一个，支持页面范围选择
 - **文档元数据** — 标题、作者、主题、创建者
 - **加密** — AES-256 加密（ISO 32000-2, Rev 6），支持所有者/用户密码和权限控制
 - **PDF/A** — PDF/A-1b 和 PDF/A-2b 合规，包含 ICC 配置文件和 XMP 元数据
@@ -415,6 +416,22 @@ doc.EachPage(func(i int, p *template.PageBuilder) {
 result, _ := doc.Save()
 ```
 
+### PDF 合并
+
+将多个 PDF 合并为一个文档，支持页面范围选择：
+
+```go
+// 合并多个 PDF
+merged, _ := gpdf.Merge(
+	[]gpdf.Source{
+		{Data: coverPage},
+		{Data: report},
+		{Data: appendix, Pages: gpdf.PageRange{From: 1, To: 3}}, // 仅前 3 页
+	},
+	gpdf.WithMergeMetadata("My Document", "Author", ""),
+)
+```
+
 ### 文档元数据
 
 ```go
@@ -519,6 +536,8 @@ doc.Render(f)
 | `doc.Overlay(page, fn)` | 在指定页上叠加内容 |
 | `doc.EachPage(fn)` | 对每页应用叠加 |
 | `doc.Save()` | 保存修改后的 PDF |
+| `gpdf.Merge(sources, opts...)` | 将多个 PDF 合并为一个 |
+| `WithMergeMetadata(title, author, producer)` | 设置合并后的元数据 |
 
 ### 文本选项
 

diff --git a/_benchmark/go.mod b/_benchmark/go.mod
@@ -5,24 +5,24 @@ go 1.24
 replace github.com/gpdf-dev/gpdf => ../
 
 require (
-	github.com/go-pdf/fpdf v1.0.0
+	github.com/go-pdf/fpdf v1.0.2
 	github.com/johnfercher/maroto/v2 v2.3.3
-	github.com/gpdf-dev/gpdf v1.0.1
+	github.com/gpdf-dev/gpdf v1.0.2
 	github.com/signintech/gopdf v0.36.0
 	golang.org/x/image v0.18.0
 )
 
 require (
-	github.com/boombuler/barcode v1.0.1 // indirect
+	github.com/boombuler/barcode v1.0.2 // indirect
 	github.com/f-amaral/go-async v0.3.0 // indirect
 	github.com/google/uuid v1.5.0 // indirect
-	github.com/hhrutter/lzw v1.0.0 // indirect
-	github.com/hhrutter/tiff v1.0.1 // indirect
+	github.com/hhrutter/lzw v1.0.2 // indirect
+	github.com/hhrutter/tiff v1.0.2 // indirect
 	github.com/johnfercher/go-tree v1.0.5 // indirect
 	github.com/mattn/go-runewidth v0.0.15 // indirect
 	github.com/pdfcpu/pdfcpu v0.6.0 // indirect
 	github.com/phpdave11/gofpdf v1.4.3 // indirect
-	github.com/phpdave11/gofpdi v1.0.15 // indirect
+	github.com/phpdave11/gofpdi v1.0.25 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/rivo/uniseg v0.4.4 // indirect
 	golang.org/x/text v0.22.0 // indirect

diff --git a/_benchmark/go.sum b/_benchmark/go.sum
@@ -1,38 +1,38 @@
-github.com/boombuler/barcode v1.0.0/go.mod h1:paBWMcWSl3LHKBqUq+rly7CNSldXjb2rDl3JlRe0mD8=
-github.com/boombuler/barcode v1.0.1 h1:NDBbPmhS+EqABEs5Kg3n/5ZNjy73Pz7SIV+KCeqyXcs=
-github.com/boombuler/barcode v1.0.1/go.mod h1:paBWMcWSl3LHKBqUq+rly7CNSldXjb2rDl3JlRe0mD8=
+github.com/boombuler/barcode v1.0.2/go.mod h1:paBWMcWSl3LHKBqUq+rly7CNSldXjb2rDl3JlRe0mD8=
+github.com/boombuler/barcode v1.0.2 h1:NDBbPmhS+EqABEs5Kg3n/5ZNjy73Pz7SIV+KCeqyXcs=
+github.com/boombuler/barcode v1.0.2/go.mod h1:paBWMcWSl3LHKBqUq+rly7CNSldXjb2rDl3JlRe0mD8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/f-amaral/go-async v0.3.0 h1:h4kLsX7aKfdWaHvV0lf+/EE3OIeCzyeDYJDb/vDZUyg=
 github.com/f-amaral/go-async v0.3.0/go.mod h1:Hz5Qr6DAWpbTTUjytnrg1WIsDgS7NtOei5y8SipYS7U=
-github.com/go-pdf/fpdf v1.0.0 h1:PPvSaUuo1iMi9KkaAn90NuKi+P4gwMedWPHhj8YlJQw=
-github.com/go-pdf/fpdf v1.0.0/go.mod h1:oO8N111TkmKb9D7VvWGLvLJlaZUQVPM+6V42pp3iV4Y=
+github.com/go-pdf/fpdf v1.0.2 h1:PPvSaUuo1iMi9KkaAn90NuKi+P4gwMedWPHhj8YlJQw=
+github.com/go-pdf/fpdf v1.0.2/go.mod h1:oO8N111TkmKb9D7VvWGLvLJlaZUQVPM+6V42pp3iV4Y=
 github.com/google/uuid v1.5.0 h1:1p67kYwdtXjb0gL0BPiP1Av9wiZPo5A8z2cWkTZ+eyU=
 github.com/google/uuid v1.5.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
-github.com/hhrutter/lzw v1.0.0 h1:laL89Llp86W3rRs83LvKbwYRx6INE8gDn0XNb1oXtm0=
-github.com/hhrutter/lzw v1.0.0/go.mod h1:2HC6DJSn/n6iAZfgM3Pg+cP1KxeWc3ezG8bBqW5+WEo=
-github.com/hhrutter/tiff v1.0.1 h1:MIus8caHU5U6823gx7C6jrfoEvfSTGtEFRiM8/LOzC0=
-github.com/hhrutter/tiff v1.0.1/go.mod h1:zU/dNgDm0cMIa8y8YwcYBeuEEveI4B0owqHyiPpJPHc=
+github.com/hhrutter/lzw v1.0.2 h1:laL89Llp86W3rRs83LvKbwYRx6INE8gDn0XNb1oXtm0=
+github.com/hhrutter/lzw v1.0.2/go.mod h1:2HC6DJSn/n6iAZfgM3Pg+cP1KxeWc3ezG8bBqW5+WEo=
+github.com/hhrutter/tiff v1.0.2 h1:MIus8caHU5U6823gx7C6jrfoEvfSTGtEFRiM8/LOzC0=
+github.com/hhrutter/tiff v1.0.2/go.mod h1:zU/dNgDm0cMIa8y8YwcYBeuEEveI4B0owqHyiPpJPHc=
 github.com/johnfercher/go-tree v1.0.5 h1:zpgVhJsChavzhKdxhQiCJJzcSY3VCT9oal2JoA2ZevY=
 github.com/johnfercher/go-tree v1.0.5/go.mod h1:DUO6QkXIFh1K7jeGBIkLCZaeUgnkdQAsB64FDSoHswg=
 github.com/johnfercher/maroto/v2 v2.3.3 h1:oeXsBnoecaMgRDwN0Cstjoe4rug3lKpOanuxuHKPqQE=
 github.com/johnfercher/maroto/v2 v2.3.3/go.mod h1:KNv102TwUrlVgZGukzlIbhkG6l/WaCD6pzu6aWGVjBI=
-github.com/jung-kurt/gofpdf v1.0.0/go.mod h1:7Id9E/uU8ce6rXgefFLlgrJj/GYY22cpxn+r32jIOes=
+github.com/jung-kurt/gofpdf v1.0.2/go.mod h1:7Id9E/uU8ce6rXgefFLlgrJj/GYY22cpxn+r32jIOes=
 github.com/mattn/go-runewidth v0.0.15 h1:UNAjwbU9l54TA3KzvqLGxwWjHmMgBUVhBiTjelZgg3U=
 github.com/mattn/go-runewidth v0.0.15/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
 github.com/pdfcpu/pdfcpu v0.6.0 h1:z4kARP5bcWa39TTYMcN/kjBnm7MvhTWjXgeYmkdAGMI=
 github.com/pdfcpu/pdfcpu v0.6.0/go.mod h1:kmpD0rk8YnZj0l3qSeGBlAB+XszHUgNv//ORH/E7EYo=
 github.com/phpdave11/gofpdf v1.4.3 h1:M/zHvS8FO3zh9tUd2RCOPEjyuVcs281FCyF22Qlz/IA=
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