PDF 圧縮
PDF を圧縮
ブラウザで動作 · アップロード不要
このツールとページ内の説明は、現在は英語のみです。動作は同じで、すべてブラウザ内で実行されます。
Drag & drop a PDF here
or
One PDF file
Your files stay on your device. Nothing is uploaded.
お使いのブラウザはこのツールを動かすには古すぎます。更新するか、最新の Chrome、Edge、Firefox、Safari をお使いください。
- 何も端末から出ません
- サーバーによるサイズ制限なし
- 登録不要・透かしなし
- 無料
How to compress a PDF
- Choose your PDF.
- Pick how much to compress: Recommended is a good balance.
- Press Compress, check the new size and download.
How it works
- Photos and scanned pages inside the PDF are re-saved as JPEG at a lower quality, and very large ones are scaled down (to 2400, 1700 or 1100 pixels on the longest side, depending on the level).
- An image is only replaced when the new version is smaller.
- Text, fonts and vector graphics are copied unchanged, so text stays sharp and selectable.
- Unused objects are removed and the file structure is packed.
When it helps
PDFs made from scans, phone photos or slides with pictures often shrink by 50–80%. PDFs that are mostly text are usually small already, so they shrink little; the tool tells you honestly when there was nothing to gain.
Your PDF stays in your browser
The file is read and changed on your device. Nothing is uploaded, so contracts, statements and IDs stay private.
よくある質問
Will the text get blurry?
No. Only images are re-compressed. Text and vector drawings are not changed.
Can I compress a password-protected PDF?
Password-protected PDFs must be unlocked first with Unlock PDF (you need the password).
Is there a size limit?
No server-imposed file size limits. Very large PDFs simply need more memory and time on your device.
Is my PDF uploaded?
No. Everything happens in your browser.