Compress PDF

popular

Compress PDF files online for free. Reduce PDF size without losing quality. Fast, secure, no watermark.

100% Secure — files never leave your deviceInstant processing in your browserFree — no signup, no watermarksFiles auto-deleted within 1 hour

Drop your file here

or click to browse

Processed entirely in your browser — your files never leave your device.

PDFPDF

How to use Compress PDF

Upload your large PDF

Click the upload area or drag and drop your PDF file. Works with any PDF regardless of how it was created.

Choose compression level

Select Recommended for the best balance of size and quality, or Maximum for the smallest possible file size.

Download compressed PDF

Click Compress & Download. Your compressed PDF downloads automatically, ready to email or upload.

Why use our Compress PDF tool

Reduces PDF size by 50 to 80 percent for most documents

Text remains perfectly sharp at all compression levels

Three compression levels to suit different needs

Works with scanned PDFs, presentations, and text documents

No watermark added to compressed output

Files processed in browser — never uploaded to server

Who uses Compress PDF

Email Attachments

Reduce a PDF below Gmail's 25MB or Outlook's 20MB attachment limit so it can be sent directly.

University Portals

Compress assignments and thesis chapters to meet the 1MB, 2MB, or 5MB upload limits imposed by academic submission systems.

WhatsApp Sharing

Reduce document size for faster sharing through messaging apps without visible quality reduction.

Cloud Storage

Compress large PDF archives to use less storage space in Google Drive, Dropbox, or OneDrive.

Website Upload

Reduce PDF size for faster loading when embedding documents in websites or content management systems.

Scanned Documents

Scanned PDFs are often very large because each page is stored as a high-resolution image. Compression dramatically reduces their size.

Frequently Asked Questions

Will compressing a PDF reduce text quality?

No. Text in PDF files is stored as mathematical vectors, not pixels. It remains perfectly sharp at all compression levels. Only images may show minor quality reduction at maximum compression.

How much can I reduce a PDF file size?

For text-heavy documents, compression typically achieves 60 to 80 percent size reduction. For image-heavy PDFs such as presentations, reduction is typically 30 to 60 percent at recommended compression.

How do I compress a PDF to under 1MB?

Use the maximum compression setting. For most text-heavy documents this achieves files well under 1MB. For image-heavy files, also consider removing non-essential pages before compressing.

Can I compress a PDF on my phone?

Yes. Open our Compress PDF tool in Safari on iPhone or Chrome on Android. The tool works identically on all devices without any app download.

Does compression affect PDF security or passwords?

Compression does not remove or affect any password protection applied to a PDF. You need to enter the password before compressing a password-protected file.

Other Free PDF Tools

Merge PDF

Combine multiple PDFs in the order you want into one document.

Rotate PDF

Fix upside down or sideways PDF pages — rotate 90°, 180° or 270°.

Split PDF

Split a PDF into separate pages or sections — extract exactly what you need.

PDF to Word

Convert your PDF to an editable Word document.

PNG to PDF

Convert PNG (and JPG) images into a single PDF file.

Need more PDF tools?

SmartPDFMasters offers six free tools — merge, compress, rotate, split, convert and create PDFs — all in one place.

Browse All Free Tools