🗜️ PDF Compressor

Free PDF compressor — free online PDF size reducer tool. Compress PDF files for free without losing quality. No registration, no file uploads to servers. 100% free PDF optimization.

Reduce PDF file size without losing quality. Your files never leave your browser.

Choose a quality preset based on your size target. Actual reduction depends on your source PDF.

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Drop PDF file here or click to browse
Max 50MB • PDF format only

Upload one PDF, pick a quality mode, then compress.

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High Quality
Best quality • 10-20% smaller
⚖️
Balanced
Good quality • 30-50% smaller
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Maximum
Smaller size • 50-80% smaller
Empty state: waiting for one PDF file.
Loading state: compression is in progress.
Success state: your compressed PDF is ready.
Analyzing PDF...
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Compression Complete!

Original
Compressed
Saved
Download Compressed PDF

Trust & Help

  • Compression runs in your browser. Files are not uploaded to our servers.
  • Compression results vary by PDF content. Image-heavy files usually shrink more than text-only files.
  • Use High Quality for readability-first documents, Balanced for general sharing, and Maximum for strict size limits.

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Sponsored

Compress PDF Online - Free PDF Optimizer

Need to compress PDF files and reduce PDF size for email attachments or web uploads? Our free PDF optimizer helps you shrink document sizes without compromising quality. Whether you're dealing with large scanned documents, high-resolution PDFs, or bulky presentations, our PDF compressor delivers impressive results. Choose from three compression levels: High Quality (10-20% reduction) for professional documents, Balanced (30-50% reduction) for everyday use, or Maximum (50-80% reduction) when file size is critical. All processing happens securely in your browser - your files are never uploaded to any server. This makes our tool perfect for compressing sensitive business documents, legal contracts, or personal files that require confidentiality. Reduce PDF file size quickly and easily with no registration required.

How to Use Our PDF Compressor

  1. Upload your PDF: Drag and drop your PDF file into the upload area, or click to browse and select from your device. Maximum file size is 50MB.
  2. Choose compression level: Select High Quality for minimal compression, Balanced for a good size-to-quality ratio, or Maximum for the smallest file size.
  3. Compress: Click the "Compress PDF" button and let our tool optimize your document instantly.
  4. Download: Review the compression statistics showing original size, new size, and percentage saved, then download your optimized PDF.

Frequently Asked Questions

Will compressing my PDF reduce its quality?
The quality impact depends on your chosen compression level. "High Quality" mode reduces file size by 10-20% with virtually no visible quality loss. "Balanced" mode (30-50% reduction) maintains good readability, while "Maximum" mode (50-80% reduction) is best for documents where file size matters more than visual fidelity.
Is my data safe when compressing PDFs online?
Yes, your files are completely secure. Our PDF compressor works entirely in your browser using client-side technology. Your documents are never uploaded to our servers or stored anywhere, ensuring maximum privacy for your sensitive information.
What is the maximum file size I can compress?
You can compress PDF files up to 50MB in size. This limit accommodates most documents including large reports, presentations, and scanned files while ensuring fast processing directly in your browser.

PDF compression workflow guide

This tool helps reduce a PDF file size for email, uploads, archiving, or sharing when the original document is larger than needed.

How to use it

  1. Upload one PDF and confirm it is the right file.
  2. Choose a quality level based on your size target.
  3. Run compression, compare the result, then download the new file.

Privacy and trust note

The page is intended for browser-based file handling. For sensitive contracts, IDs, medical, or legal files, test with a non-sensitive copy first and review the downloaded result before sharing.

Common mistakes

  • Expecting large scanned PDFs to shrink like text-based PDFs; scanned images may need OCR or image optimization first.
  • Choosing maximum compression when readability matters.
  • Sharing the compressed file without opening it once to check page order and visual quality.
Need searchable text next? Try PDF to Text after compression. Open related tool →

Recommended next reading

Use these practical guides to understand when this tool is the right choice, what to check before exporting, and which workflow usually comes next.

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