PDF Compressor

PDF Compressor reduces PDF file size while preserving readability for everyday sharing and submission workflows. The tool now runs in local mode by default, so you can compress directly in your browser without uploading file content unless you explicitly choose cloud mode.

After compression, you can immediately review original size, compressed size, and saved percentage. If a compression attempt does not produce a smaller output, the tool keeps the original file size outcome instead of forcing a larger result.

Key Features

• Default local compression mode for privacy-focused workflows.
• Optional cloud compression mode for stronger reduction on scan-heavy PDFs.
• Three local presets: Lossless, Balanced, and Maximum Compression.
• Cloud tuning options: resolution preset plus image quality (1-100).
• Clear result metrics: original size, compressed size, bytes saved, and saved percentage.

How To Use

1. Upload one PDF file (up to 100 MB).
2. Choose a run mode: Local (Default) for browser-only processing, or Cloud (Better Compression) for higher compression.
3. Configure parameters:
   • Local mode: choose a local compression preset.
   • Cloud mode: choose resolution preset and image quality.
4. Click Compress PDF and wait until processing finishes.
5. Review the result panel and download the compressed PDF.

Parameter Guide

Run Mode

• Local (Default): Compression runs in-browser and avoids file-content upload.
• Cloud (Better Compression): Sends file data to cloud processing, often producing smaller files on image-heavy documents.

Local Compression Preset

• Lossless: Structural optimization only; keeps quality intact with conservative size reduction.
• Balanced: Recommended default for mixed PDFs; balances readability and file size.
• Maximum Compression: Strongest reduction target, suitable when file size limit is strict.

Cloud Settings

• Resolution Preset: Controls output detail level (Screen, Ebook, Printer, Prepress, Default).
• Image Quality (1-100): Lower values reduce size more; higher values preserve visual quality.

Use Cases

1. Quickly shrink PDF attachments before sending by email.
2. Meet strict upload-size limits for forms and submission portals.
3. Optimize document archives while selecting privacy level per file.

Comparison With Similar Tools

Compared with Smallpdf, iLovePDF, and Adobe Acrobat online compression, this PDF compressor gives you a clear local-vs-cloud choice: local-first privacy with optional stronger cloud compression when reduction rate matters more.

Best Practices

• Start with Local + Balanced for most office documents.
• Switch to cloud mode when scanned pages remain too large after local compression.
• Use Lossless when output fidelity is more important than compression ratio.

Important Notes

• Only one PDF file can be processed per run.
• Maximum file size is 100 MB.
• Large or image-heavy PDFs may require more processing time.
• Some PDFs may not shrink significantly; original-size output can be retained.
• Cloud mode uploads file content, so review privacy requirements before use.