無料ツール
PDFの各ページにカスタムテキスト透かしを追加 — 不透明度、サイズ、回転を制御して即座にダウンロード。
使い方
3ステップで透かしを追加する
- 1
Upload your PDF
Drag and drop your PDF onto the tool or click to browse. The file loads in your browser — never sent to any server.
- 2
Set the watermark
Type your watermark text (e.g. 'CONFIDENTIAL' or 'DRAFT'). Adjust font size, opacity, rotation angle, and color using the controls.
- 3
Download the watermarked PDF
Click 'Download watermarked PDF'. The watermark is drawn on every page using pdf-lib and your browser downloads the result immediately.
Signvoyを選ぶ理由
完全なコントロール、即時の結果
Fully customizable
Set any text, font size, opacity (5–60%), rotation angle (0–90°), and color. The live preview shows you roughly how it will look before downloading.
Every page, instantly
The watermark is applied to all pages at once using pdf-lib in your browser — no queue, no per-page upload, no waiting.
Private by design
Your PDF never leaves your device. All processing is local — close the tab and everything is gone.
よくある質問
よくある質問
- Can I watermark only specific pages?
- The current tool applies the watermark to all pages. If you need page-specific watermarks, use the Add Text to PDF tool to place text manually on individual pages.
- Is the watermark removable?
- The watermark is drawn directly into the PDF page content as a text element — it is not a removable annotation. However, it is not cryptographically secure; a determined person with editing software could attempt to remove it.
- Can I use an image as a watermark?
- Currently only text watermarks are supported. Image watermarks (e.g. a logo) are planned for a future update.
- What opacity should I use?
- For a typical 'CONFIDENTIAL' or 'DRAFT' stamp, 15–25% opacity works well — visible enough to notice but not so heavy it obscures the content. Use 40–60% for a bolder mark.
もっと詳しく知りたいですか？ 完全ガイドを読む: PDFに透かしを無料でオンライン追加する方法 →
署名の催促をやめよう
Signvoyを使って取引を成立させ、クライアントをオンボーディングし、契約書に署名している数千のチームに参加しましょう — より速く。
クレジットカード不要 · 永久無料プラン · 14日間プロトライアル