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HomeCompress
Convert
JPGPDF to ImageConvert PDF pages to JPG/PNGWPDF to DOCXConvert PDF to Word documentsWWord to PDFConvert Word files to PDF
Edit PDF
Merge PDFCombine multiple PDFs into oneOrganize PagesRearrange PDF page orderEdit PDFAdd text, images to PDFRotate PagesRotate pages in PDF files
PDF Security
Add WatermarkBrand your PDFs with watermarksEncrypt PDFLock PDF with a passwordSign PDFAdd digital signature to PDF
PricingBlogContact
Log inSign up
HomeAll ToolsOptimize & RepairCompress PDF

Compress PDF

Reduce PDF file size while preserving quality — one PDF at a time.

Select a PDF file

Drag and drop files here, or click to browse

Compression Options

Compression level

Ready to compress

Add PDF files to get started

  • Free plan: files deleted after 2 hours
  • 256-bit SSL encryption
  • GDPR-conscious processing

Pro tips

  • Start with Medium — it balances size and quality. Switch to Maximum when the file is still too large.
  • Compress one PDF at a time. Upload the next file once your download is ready.
  • Scanned and photo-heavy PDFs shrink the most. Text-only PDFs are already compact, so expect smaller savings.

About This Tool

Compress PDF reduces the file size of your PDF documents while maintaining acceptable quality. This is essential for email attachments, web uploads, or saving storage space.

Three compression levels let you trade file size against visual quality: Standard is the quickest pass, Medium balances size and sharpness for everyday documents, and Maximum squeezes scanned pages the hardest.

Compression runs on our servers, which is what makes the deeper compression levels possible. Your file is encrypted in transit and deleted when your plan's retention window ends.

How to Use

  1. 1

    Upload Your PDF

    Drag and drop your PDF file or click to select the document you want to compress.

  2. 2

    Choose Compression Level

    Pick Standard for the quickest run, Medium for a balance of size and quality, or Maximum for the smallest possible file.

  3. 3

    Compress and Download

    Click Compress to reduce the file size, then download your optimized PDF.

Use Cases

Email Attachments

Reduce PDF size to meet email attachment limits and ensure faster delivery.

Web Publishing

Optimize PDFs for web download to improve page load times and user experience.

Storage Optimization

Compress archived documents to save disk space while maintaining accessibility.

Frequently Asked Questions

How much can I reduce the file size?

Compression results vary with the PDF's content. Scanned and image-heavy PDFs are often reduced by 50-80%, while text-only PDFs are already compact and see smaller reductions.

Will compression affect text quality?

Text stays sharp and selectable at every level. Compression separates text from the background imagery behind it, so only images and graphics are recompressed.

Can I compress multiple PDFs at once?

Not at the moment — the compressor handles one PDF per run. Upload your next file once the current download is ready.

What compression setting is best before emailing a PDF?

Medium clears most email providers' practical limits — see /compress-pdf-for-email for size guidance specific to Gmail, Outlook, and other providers.

Does my file leave my device?

Yes. Unlike our browser-based tools, compression runs on our servers so it can reach much smaller file sizes. Your PDF is encrypted in transit, is never shared with third parties, and is deleted when your plan's retention window ends.

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References

  • Data compression – WikipediaIntroduction to lossless and lossy data compression techniques used in PDF optimisation.
  • Deflate – WikipediaThe DEFLATE algorithm (RFC 1951) used widely for compressing streams inside PDF files.
  • PDF – WikipediaPortable Document Format specification, including compression filter details.
  • Merge PDFCombine multiple compressed PDFs into a single document.
  • Compress a PDF to 100KBA focused guide for the strictest upload caps, like government and exam-board forms.

Every tool you need to work with PDFs — fast, private, self-hosted.

Product
  • All tools
  • Pricing
Categories
  • Organize & Manage
  • Edit & Annotate
  • Convert to PDF
  • Convert from PDF
  • Optimize & Repair
  • Secure PDF
Company
  • About
  • Contact
  • Blog
  • Help Center
Legal
  • Terms
  • Privacy
  • Security
  • Refund Policy
© 2026 pdfsimple. All rights reserved.