Frequently Asked Questions

Yes, CrushMyPDF is completely free. There are no hidden costs, premium tiers, or subscription fees. You can compress unlimited PDFs without any restrictions beyond basic file size limits (15MB maximum).

Features included for free:

• Three compression levels (low, medium, high)
• No watermarks added to your documents
• No registration required
• Secure processing with automatic file deletion
• Mobile-friendly interface

The maximum file size is 15MB. This limit exists to ensure fast processing and prevent server overload.

If your PDF exceeds 15MB, try these solutions:

• Split the document: Break large PDFs into smaller sections
• Optimize before upload: Use print-to-PDF with reduced quality settings
• Remove unnecessary pages: Delete blank or redundant pages
• Compress images separately: Reduce image quality in the source document

Most documents under 15MB will process quickly and achieve excellent compression results.

Yes, your files are processed securely. Here's how we protect your documents:

• Automatic deletion: Files are deleted after 5 minutes
• SSL encryption: All transfers use HTTPS encryption
• No storage: We don't store files on permanent servers
• No access: We never view or access your document content
• No registration: No personal information required
• Privacy by design: Built with security as the foundation

For highly sensitive documents (financial, legal, medical), consider using offline tools or validated enterprise solutions.

No, we do not store or keep any copies of your files.

Here's exactly what happens to your documents:

1. Upload: File is temporarily stored for processing
2. Compression: Document is processed in memory
3. Download: Compressed file is made available to you
4. Automatic cleanup: Both original and compressed files are permanently deleted after 5 minutes

This process ensures your privacy while providing the service you need. We have no interest in storing or accessing your documents.

Choose the compression level based on your specific needs:

Recommendation: Start with Medium compression for most documents. If quality is paramount, use Low. If file size is critical, try High.

Quality impact depends on the compression level you choose:

• Low compression: Minimal to no visible quality loss
• Medium compression: Slight quality reduction that's typically unnoticeable for most use cases
• High compression: More noticeable quality reduction, but text remains readable

What's preserved:

• Text clarity and readability
• Document structure and formatting
• Searchable text content
• Interactive elements (links, forms)

What may be affected:

• Image sharpness (especially with high compression)
• Color accuracy in photographs
• Fine graphic details

Tip: Always preview your compressed document before sharing to ensure it meets your quality requirements.

CrushMyPDF works on all modern browsers:

• Chrome: Version 60 and newer
• Firefox: Version 55 and newer
• Safari: Version 12 and newer
• Edge: Version 79 and newer (Chromium-based)
• Mobile browsers: iOS Safari, Android Chrome

Required features:

• JavaScript enabled
• File upload support
• HTML5 compatibility

The service is fully responsive and works excellently on desktop, tablet, and mobile devices.

No, password-protected PDFs cannot be compressed directly. The encryption prevents access to the document structure needed for compression.

Solutions:

1. Remove password first: Use the document owner's password to create an unprotected copy
2. Compress, then protect: Compress the unlocked PDF, then reapply password protection
3. Use desktop tools: Some offline tools can handle protected PDFs with the correct password

Important: Only remove password protection from documents you own or have explicit permission to modify. Attempting to bypass password protection on documents you don't own may violate copyright and security policies.

Email providers have varying attachment size limits:

• Gmail: 25MB limit
• Outlook: 20MB limit
• Yahoo: 25MB limit
• Corporate email: Often 10MB or less

Recommended approach:

1. Check your email limit: Know your provider's restrictions
2. Use medium compression: Good balance for most documents
3. Aim for under 5MB: Ensures fast delivery and compatibility
4. Test send to yourself: Verify the attached file works correctly

Pro tip: If your compressed PDF is still too large, consider splitting the document into multiple smaller files or using a cloud sharing service instead.

Yes, but consider your document sensitivity level:

For enterprise use: Consider implementing offline compression tools or validated enterprise services that meet your organization's security and compliance requirements.

Some PDFs are already well-optimized and may not compress significantly:

Documents that compress well:

• Scanned documents with large images
• PDFs created from Word/PowerPoint
• Documents with unoptimized images
• Files with embedded fonts and objects

Documents that compress less:

• Already compressed PDFs
• Simple text-only documents
• PDFs created with optimization settings
• Documents that have been compressed before

Tips for better compression:

1. Try a higher compression level
2. Remove unnecessary pages or content
3. Use the original source document and re-export as PDF with lower quality settings
4. Check if the PDF contains large embedded images that could be optimized separately

If compression fails, try these troubleshooting steps:

1. Check file size: Ensure your PDF is under 15MB
2. Verify file format: Only PDF files are supported
3. Test file integrity: Open the PDF in a reader to ensure it's not corrupted
4. Try a different compression level: Some files work better with specific settings
5. Remove password protection: Encrypted PDFs cannot be compressed
6. Check your internet connection: Ensure stable connectivity during upload
7. Try a different browser: Some browsers handle uploads better
8. Clear browser cache: Old cache files can cause issues

Still having issues? The PDF may have unusual formatting, corruption, or security settings that prevent compression. Try creating a new PDF from the original source document.