Compress PDF Online Free — Reduce PDF File Size Without Losing Quality

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Why Are PDF Files So Large?

PDF file size depends on what's inside:

  • Embedded images — Scanned documents and image-heavy PDFs are the largest; they also have the most compression potential
  • Embedded fonts — PDFs embed full font files to ensure consistent display; fonts can add hundreds of KB
  • Vector graphics — Relatively compact; limited compression potential
  • Plain text — Already very small; compression yields minimal savings

How to Compress a PDF Online

Use the tool.tl PDF Compressor:

  1. Go to tool.tl/compress-pdf
  2. Upload your PDF
  3. Choose a compression level (Medium is recommended for most uses)
  4. Click "Compress PDF"
  5. See the before/after size comparison, then download
Expected results: Scanned PDFs can shrink 50–80%. Design/vector PDFs typically compress 10–30%. Text-only PDFs see minimal reduction since they're already small.

Choosing the Right Compression Level

LevelQualitySize ReductionBest For
Low (high quality)Near lossless10–30%Print-ready files, archiving
Medium (recommended)Slight loss, barely visible40–60%Email, web sharing, uploads
High (smallest file)Noticeable quality drop60–80%Previews, quick transfers

Common PDF Upload Size Limits

Platform / Use CaseSize Limit
Gmail attachment25 MB
Outlook attachment20 MB
WhatsApp document100 MB
Government portals (typical)2–10 MB
University submission systems20–50 MB
Shopify / e-commerce platforms20 MB

Other Ways to Reduce PDF Size

  • Extract only needed pages — Use the PDF Splitter to pull out just the pages you need before sending
  • Compress images before converting — If building a PDF from images, compress them first with the Image Compressor, then combine with JPG to PDF
  • Export at web resolution — When exporting from Word or PowerPoint, choose "Optimize for web" instead of "High quality print"

Frequently Asked Questions

Can I restore the original PDF after compression?

No — compression (especially lossy image compression) is permanent. Always keep a backup of your original before compressing.

How much can a text-only PDF be compressed?

Very little — typically 5–15%. Text-only PDFs are already efficient. The biggest size savings come from PDFs containing images.

Will the text still be searchable and copyable after compression?

Yes. PDF compression targets image data, not the text layer. Searchable text remains searchable. Scanned PDFs (which are images, not real text) are not searchable either before or after compression.

Can I compress a password-protected PDF?

You'll need to unlock it first — enter the password when prompted, or remove protection before uploading.