PDF 圧縮
品質を維持したまま、ブラウザ上でPDFファイルサイズを軽量化。
or drag and drop it here
How to Compress a PDF
Step 1: Upload your PDF
Drag and drop your PDF into the upload area, or click to browse for a file. Supports any PDF document, regardless of size.
Step 2: Choose a compression level
Select your preferred compression preset. "Recommended" gives the best balance. "Extreme" shrinks the file most aggressively. "Low" compresses lightly for the best visual quality.
Step 3: Download compressed file
Click "Compress PDF" and your reduced-size PDF will be downloaded automatically. The entire process runs in your browser — nothing is uploaded.
Frequently Asked Questions
How much can I reduce my PDF file size?
File reduction depends on the content of the PDF. Documents with large high-resolution images can often be reduced by 50% to 80% with minimal visible loss.
Will compressing my PDF reduce text quality?
With the Recommended and Low compression presets, text remains crisp and readable. Extreme compression lowers resolution slightly to achieve maximum space savings.
Are my files uploaded to a remote server?
No. PDFreeAI performs all compression client-side directly within your browser. Your sensitive files never leave your computer.