Flatten PDF

Local Processing (Offline Capable)

Merge form fields into read-only page content for tamper-proof distribution; outputs an optimized copy when no forms are present. Unlike Sanitize, flattening targets form fields only without deleting scripts or metadata.

Local processing: your file is not uploaded to us · ≤ 10 MB per fileLocal tools: free & unlimited, no account needed · Cloud tools require a free account (3 tasks per day)

How this tool works (no sign-up needed)

  1. Upload your file above. Each tool shows whether it runs Local (in your browser) or Cloud (encrypted servers).
  2. Adjust options, then click the Run / Convert / Process button.
  3. Wait for progress, then download the result. Use Next tools to continue.

If buttons are not visible, enable JavaScript — the interactive workspace loads in your browser.

pdflean://pdf-flattenLOCAL

免費 · 本地處理表單欄位轉唯讀頁面內容,輸出後無法再編輯

Drag files here, or click to browse

Supports application/pdf

压平范围

Local — your file is processed in your browser and not uploaded to us. No account needed.

What is it?Flatten PDF 是 PDFLean 的優化工具:將表單欄位合併為唯讀頁面內容,確保分發時無法被竄改。

TL;DR: 將表單欄位合併為唯讀頁面內容,確保分發時無法被竄改。所有操作皆在您的瀏覽器本地執行——檔案不會上傳,關閉頁面後立即清除;扁平化後的表單將無法再次編輯。

Measured: ~21 ms median on a typical sample — full benchmark table below.

This tool processes PDF documents that contain form fields, merging those interactive fields into read-only page content for tamper-proof sharing. Processing runs entirely in your browser's memory — the document is never transmitted, and closing the tab clears it completely. The output is a flattened PDF in which form data is baked into the page content; when the input has no form fields, an optimized copy is returned instead. Key limitation: forms can no longer be edited after flattening, and files larger than 10 MB are not supported since processing happens inline in the browser.

About this tool

無需註冊、無需上傳檔案、無浮水印 — 只需要您要進行的操作。將表單欄位合併為唯讀頁面內容,確保分享安全。不同於 Sanitize,本工具僅處理表單欄位。所有處理都在瀏覽器記憶體中本地執行 — 檔案絕不會被傳輸,關閉分頁後即完全清除。工作流程設計極度精簡:載入檔案、選擇頁面選項、執行操作、儲存結果。所有設定在檔案寫入前套用完畢,因此變更設定重新執行只需數秒。實用限制請參閱頁面說明;若單一步驟不足以完成工作,可搭配本頁側邊的相關工具。重點摘要 — 處理方式:完全於瀏覽器中執行,用戶端處理;使用方式:免費,無需帳戶;檔案限制:請見頁面說明;隱私保護:檔案永不離開您的裝置。

Measured performance benchmarks

SampleInputOutputMedian timeSize change
Flatten form fields (60-page report)160 KB158 KB21 ms−1%

Measured locally in your browser (isomorphic production code; samples are programmatically generated text PDFs, median of 5 runs). Real-world image-heavy PDFs differ — see the on-page limits.

How to use

1

上傳含有表單欄位的 PDF

2

點擊「Flatten PDF」

3

下載唯讀輸出結果

FAQ

我的檔案會被上傳嗎?

不會。所有操作皆在您的瀏覽器本地執行——檔案不會上傳,關閉頁面後立即清除。

有什麼限制?

扁平化後的表單將無法再次編輯;單一檔案大小限制為 ≤ 10MB(瀏覽器內嵌處理)。

扁平化會影響數位簽章或 XFA 表單嗎?

扁平化會移除表單欄位的互動性,並使已簽署文件中的數位簽章失效。此外,只有 AcroForm 欄位會被合併至頁面內容——XFA 表單不會被扁平化。

我可以批量處理多個檔案嗎?

單一工具頁面一次處理一項任務;如需大量作業,請使用 Batch Processing 工作流程,並將此工具新增為步驟,一次執行整組任務。

處理後的檔案仍然可編輯嗎?

輸出仍是標準 PDF,可在任何 PDF reader 中開啟;原始文件保持不變,您會收到新檔案;然而,扁平化後的表單內容已成為唯讀頁面元素,無法再作為表單欄位填寫。