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PDF圧縮

メール、共有、保存のためにPDFファイルを圧縮。無料オンラインツール — ブラウザ上で動作、サーバーへのアップロード不要。PDFサイズを最大90%即時削減。

無料100%プライベートアップロード不要

PDFをここにドラッグ

最大100MBのPDFファイル

よくある質問

How much can I compress a PDF?

Typically 50-80% size reduction for image-heavy PDFs. Text-only PDFs see less reduction (10-30%). Use "Maximum" for smallest files, "Balanced" for quality/size tradeoff.

Does compression affect text quality?

Text remains sharp and searchable. Compression primarily reduces image quality within the PDF. At "Balanced" settings, the difference is barely noticeable.

使い方

1

Upload PDF

Select your PDF file. The tool shows page count and current file size.

2

Choose Level

Select compression level: Maximum (smallest), Balanced (recommended), or High Quality.

3

Download

Download your compressed PDF and compare the size reduction.

ヒントと最適な設定

Tips

For email: use Maximum compression (under 10MB limit). For printing: use High Quality. For web sharing: Balanced gives the best results.