How to Compress a PDF Without Losing Quality

Whether you're trying to email a contract or upload a portfolio, hitting the file-size wall is frustrating. The good news: most PDFs can be compressed dramatically without losing visible quality.

Why are PDFs so big?

Three things usually account for the bulk: high-resolution images embedded inside the file, embedded fonts (especially for many languages), and metadata leftover from the original software.

Three compression levels — what they mean

• Low: Light compression. Best when print quality matters.
• Medium: The sweet spot for most use cases. Roughly 50–70% smaller files.
• High: Maximum shrink. Ideal for email or web previews where pixel-perfection isn't critical.

Step-by-step

1. Open Compress PDF.
2. Drag your PDF into the upload area.
3. Pick a compression level.
4. Download the compressed file.

Pro tips

• Compress PDFs before signing — re-compressing a signed PDF can invalidate the signature.
• If most of your file is scanned images, run OCR first — it lets you compress the underlying images more aggressively.
• Combine compress + merge as a single workflow when stitching together long documents.