Clean PDF Metadata
Remove document properties and identifying metadata
Clean PDF Metadata — what it does
Remove a PDF's standard document properties — title, author, subject, keywords, producing application and creation dates — before the file goes anywhere. These fields travel silently with every document and routinely carry an employee's name, an internal file path or the software used to produce it.
When this tool helps
- Stripping the author name from a document being published or filed publicly.
- Removing internal software and template traces before sending a file to a client.
- Cleaning document properties before submitting a file where anonymity matters.
How to use it
- Choose the PDF file.
- Process the metadata removal.
- Download the cleaned document.
- Verify with the metadata viewer that the fields are gone.
Accuracy, limits, and good practice
- Verify rather than assume: open the output in the metadata viewer and confirm the fields you cared about are actually empty.
- Metadata is only one channel. Content itself — a name in a footer, tracked changes converted to text, or a visible file path — leaks just as easily.
- Removing properties does not touch embedded content such as attachments or images with their own metadata.
- Clean as the last step before sending. Any later edit in a PDF application writes fresh producer and timestamp metadata straight back in.
Frequently asked questions
What metadata does a PDF carry?
Title, author, subject, keywords, the creating and producing applications, and creation and modification timestamps.
Does this remove hidden text or layers?
No. It clears document properties. Content-level exposure needs redaction or a rebuild of the pages.
Can I set new values instead of clearing them?
Yes, the metadata editor writes your own title, author, subject and keywords in place of the originals.
Does it remove digital signatures?
Editing a signed PDF generally invalidates the signature. Check any signed document carefully after processing.
Related tools on this site
- Convert PDF Page Size — Fit PDF pages onto A4, Letter, Legal, or custom sheets
- QR Code Generator — Create a downloadable QR code for text or URLs
- Image to Base64 — Convert images locally in browser
Everything above runs inside this page. Clean PDF Metadata needs no account, no upload, and no server round trip — close the tab and nothing is left behind.
清除 PDF 中繼資料能做什麼
在檔案外流之前，移除 PDF 的標準文件屬性——標題、作者、主旨、關鍵字、產生軟體與建立日期。這些欄位會悄悄跟著每份文件走，而且經常帶著員工姓名、內部檔案路徑或製作用的軟體資訊。
什麼時候用得上
- 在公開發佈或歸檔前，把作者姓名從文件中拿掉。
- 把檔案寄給客戶前，移除內部軟體與範本痕跡。
- 在需要匿名的場合提交檔案前，先清掉文件屬性。
使用步驟
- 選擇 PDF 檔案。
- 執行中繼資料移除。
- 下載清理後的文件。
- 用文件資訊檢視器確認欄位已清空。
精確度、限制與實務建議
- 要驗證、不要假設：把輸出丟進資訊檢視器，確認你在意的欄位真的是空的。
- 中繼資料只是其中一個管道。內容本身——頁尾的姓名、被轉成文字的修訂紀錄、看得見的檔案路徑——同樣容易洩漏。
- 移除屬性不會動到內嵌內容，例如附件或本身帶有中繼資料的圖片。
- 請把清理放在寄出前的最後一步。之後只要再用 PDF 軟體編輯一次，製作軟體與時間戳就會重新寫回去。
常見問題
PDF 會帶哪些中繼資料？
標題、作者、主旨、關鍵字、建立與產生軟體，以及建立與修改時間戳。
會移除隱藏文字或圖層嗎？
不會。它清除的是文件屬性。內容層面的外洩需要遮蓋或重建頁面。
可以改成填入新值嗎？
可以，中繼資料編輯器能以你自己的標題、作者、主旨與關鍵字覆蓋原有內容。
會移除數位簽章嗎？
編輯已簽章的 PDF 通常會使簽章失效。處理後請仔細檢查任何帶簽章的文件。
本站相關工具
- PDF 頁面尺寸轉換 — 將 PDF 頁面縮放至 A4、Letter、Legal 或自訂尺寸
- QR Code 產生器 — 將文字或網址製作成可下載的 QR Code
- 圖片轉 Base64 — 在瀏覽器中本地轉換圖片
以上步驟全部在這個頁面內完成，清除 PDF 中繼資料 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。