Merge PDF
Combine multiple PDF files into one in seconds. Easy, fast, and secure—right in your browser.
Merge PDF — what it does
Combine several PDF files into one document, in the order you selected them, entirely inside the browser. No upload, no queue, no watermark on the output — the files are parsed and rewritten locally, which matters when the documents being merged are contracts, invoices or medical records.
When this tool helps
- Assembling a contract, its annexes and signed pages into one file for filing.
- Combining monthly statements or invoices into a single document for an accountant.
- Putting a report, its appendices and cover letter together before sending.
How to use it
- Choose the PDF files in the order they should appear.
- Confirm the file list.
- Merge the PDFs.
- Download the combined document.
Accuracy, limits, and good practice
- Selection order sets page order; rename files with numeric prefixes first if you need a guaranteed sequence.
- Merging preserves each source's page sizes, so a mix of A4 and Letter produces a document with varying page dimensions.
- Form fields, bookmarks and annotations may not all survive a merge — check anything interactive in the output before relying on it.
- Merge in the order the reader needs, then check the joins: the first page of each source document is where an out-of-order bundle gives itself away.
Frequently asked questions
Are my documents uploaded?
No. Files are read and combined by JavaScript in your browser; nothing is transmitted to a server.
Can I reorder pages after merging?
Yes, the reorder PDF pages tool takes the merged file and rearranges it into any order you specify.
Does merging reduce quality?
No. Page content is copied as-is; the merged file is roughly the sum of its parts in size.
Can I merge a password-protected PDF?
No, encrypted documents cannot be read. Remove the protection in a PDF application first.
Related tools on this site
- PDF to Images — Render PDF pages as JPG or PNG files
- Date Calculator — Add or subtract dates easily
- Delete PDF Pages — Remove selected pages and download a clean PDF
Everything above runs inside this page. Merge PDF needs no account, no upload, and no server round trip — close the tab and nothing is left behind.
合併 PDF能做什麼
把多個 PDF 依你選取的順序合併成一份文件，全程在瀏覽器中完成。不上傳、不排隊、輸出沒有浮水印——檔案在本機解析並重寫，而當要合併的是合約、發票或病歷時，這一點格外重要。
什麼時候用得上
- 把合約、附件與簽署頁組成單一檔案以便歸檔。
- 把每月對帳單或發票併成一份文件交給會計。
- 把報告、附錄與說明信整合後再寄出。
使用步驟
- 依應出現的順序選擇 PDF 檔案。
- 確認檔案清單。
- 執行合併。
- 下載合併後的文件。
精確度、限制與實務建議
- 選取順序決定頁面順序；需要確保次序時，請先為檔名加上數字前綴。
- 合併會保留各來源的頁面尺寸，A4 與 Letter 混合會產生尺寸不一的文件。
- 表單欄位、書籤與註解未必都能在合併後存活——互動元素請在輸出中先確認再使用。
- 請依讀者需要的順序合併，然後檢查接縫：卷宗順序錯了，破綻通常就出現在各來源文件的第一頁。
常見問題
文件會被上傳嗎？
不會。檔案由瀏覽器中的 JavaScript 讀取並合併，不會傳送到伺服器。
合併後可以調整頁面順序嗎？
可以，PDF 頁面重新排序工具能接手合併檔，依你指定的順序重排。
合併會降低品質嗎？
不會。頁面內容原樣複製，合併檔大小大致等於各部分之和。
可以合併有密碼的 PDF 嗎？
不行，加密文件無法讀取。請先在 PDF 軟體中移除保護。
本站相關工具
以上步驟全部在這個頁面內完成，合併 PDF 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。