How much can I compress a PDF?

Compression depends on PDF content. Image-heavy PDFs can be reduced by 60–90%. Text-only PDFs may only reduce by 10–20% since text is already compact. The High compression mode gives maximum reduction.

Does compressing a PDF reduce quality?

Low and Medium compression preserve visual quality for screen viewing. High compression reduces image resolution, which is noticeable on print but fine for email and web use.

How do I compress a PDF without losing quality?

Use Low compression mode, which removes redundant metadata and optimizes internal PDF structure without reducing image quality.

What causes large PDF file sizes?

High-resolution embedded images are the main cause of large PDFs. Other factors include embedded fonts, form data, revision history, and metadata. Compression addresses all of these.

Is there a file size limit for compression?

The maximum upload size is 100MB.

Free PDF Compressor — Reduce PDF Size Online

Shrink PDF files by optimizing their structure and images. Choose a compression level, see the exact size reduction, and re-compress harder if needed. Files deleted within an hour.

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Compression level

Low — best quality (~20–30% smaller) Medium — balanced (~40–60% smaller) High — smallest file (~60–90% smaller) Custom image DPI

Compress images Remove metadata Remove comments & annotations Flatten form fields Remove bookmarks

Privacy: Your files are processed on our servers and automatically deleted within 1 hour.

Frequently Asked Questions

How much can I compress a PDF?: Compression depends on PDF content. Image-heavy PDFs can be reduced by 60–90%. Text-only PDFs may only reduce by 10–20% since text is already compact. The High compression mode gives maximum reduction.
Does compressing a PDF reduce quality?: Low and Medium compression preserve visual quality for screen viewing. High compression reduces image resolution, which is noticeable on print but fine for email and web use.
How do I compress a PDF without losing quality?: Use Low compression mode, which removes redundant metadata and optimizes internal PDF structure without reducing image quality.
What causes large PDF file sizes?: High-resolution embedded images are the main cause of large PDFs. Other factors include embedded fonts, form data, revision history, and metadata. Compression addresses all of these.
Is there a file size limit for compression?: The maximum upload size is 100MB.