PDF Compressor Online

• Reduces PDF file size by up to 90% depending on content type and compression level
• Three compression modes: low (best quality, ~30% reduction), medium (balanced, ~60%), high (smallest file, ~90%)
• Preserves text selectability, hyperlinks, bookmarks, and document structure
• Image-heavy PDFs with scans and photos see the largest size reductions
• All PDF compression runs locally in your browser — files never leave your device

Use Cases

Frequently Asked Questions

How much can this PDF compressor reduce file size?

File size reduction depends on content type and compression level. Image-heavy PDFs (scans, photos, presentations) typically compress by 60-90%. Text-heavy PDFs with few images may compress by 20-40%. The tool displays exact before/after size and percentage saved after compression.

Can I compress a PDF to a specific file size like 1 MB or 200 KB?

This tool uses level-based compression (low, medium, high) rather than target-size input. Start with high compression for the smallest output. If the result is still too large, consider splitting the PDF into sections using our PDF Splitter tool and compressing each section individually.

Does PDF compression affect text quality and readability?

Text remains fully selectable and searchable at all compression levels because compression primarily targets embedded images and redundant data. Low and medium modes preserve excellent visual quality. High mode may reduce image clarity on photo-heavy or scanned pages, but text elements remain sharp.

Is this online PDF compressor free to use without limits?

Yes, the PDF compressor is completely free with no file size limits, no watermarks, and no account registration required. You can compress as many PDFs as needed directly in your browser.

Is my PDF data safe when using this compressor?

Yes. All compression processing happens locally in your browser using client-side JavaScript. Your PDF is never uploaded to any server, making it safe for confidential, legal, financial, and personal documents.

Can I compress scanned PDF documents?

Yes, scanned PDFs often see the best compression results because they contain large raster images. Even low compression can reduce scanned PDFs by 40-60%, while high compression may achieve 80-90% reduction depending on scan resolution and color depth.

Why does my PDF file size barely change after compression?

The file may already be optimized, or it may be a text-only PDF with minimal compressible data. Try a higher compression level, or use our PDF Splitter to extract only the pages you need, which effectively reduces the working file size.