Reduce PDF File Size Free Online
Reduce PDF file size free online. Compress PDFs by up to 90% with no quality loss on text. Smart image compression. No signup. Works on any device.
Key Features
- Image resampling to 72/150/300 DPI
- Font subsetting removes unused characters
- Metadata and annotation object removal option
- Shows exact before/after file size
- Three quality presets + target-size mode
- No file size limit on input
- Batch compression for multiple files
- In-browser — files never uploaded
About Reduce PDF File Size
Reduce PDF file size for email, web, and storage without losing readable quality. PDF AI Tools compresses images, subsets fonts, and removes metadata to achieve maximum size reduction in the browser — no upload, no file size limits, no daily caps.
Three compression strategies applied simultaneously: image downsampling to the optimal DPI for use case, font subsetting to remove unused glyph data, and metadata stripping to eliminate non-essential overhead.
Who Uses This Tool
- Reduce an emailed proposal PDF that exceeds the recipient size limit
- Shrink a PDF portfolio for a job application upload
- Optimize PDFs for a website to improve page load time
- Reduce storage cost for archived document libraries
How to Use Reduce PDF File Size Free Online
- Step 1: Upload your PDF to the Compress PDF tool
- Step 2: Select quality preset matching your use case
- Step 3: Click Compress and review the size reduction
- Step 4: Download the smaller PDF
Frequently Asked Questions
How much can I reduce a typical PDF?
Scanned-image PDFs: 60–80% reduction. Text-heavy PDFs: 20–40%. PDFs already compressed: 5–15%.
Will reducing file size affect print quality?
At "print" quality preset, images are resampled to 300 DPI — no visible quality loss for standard A4/Letter printing.
Can I reduce a PDF that is already compressed?
Minimal reduction is possible. If the PDF was already optimized, no algorithm can significantly shrink it further.
Does reducing size remove bookmarks?
No — bookmarks and hyperlinks are preserved at all quality levels.