How to Reduce PDF Size Online Free
A PDF size reducer lowers megabytes to kilobytes so your file fits upload limits. pdfcorpus helps you reduce PDF size, shrink PDF files, and make PDF smaller — free and instant.
Why PDF files get so large
PDF size grows from high-resolution scans, embedded photos, multiple fonts, and uncompressed images. A 50-page scanned document can exceed 20 MB. To decrease PDF size, you need compression that targets images and redundant data without destroying text clarity.
How pdfcorpus reduces PDF file size
- Analyzes your PDF to detect text vs scanned content
- Applies smart compression based on Best, Good, or Smallest Size mode
- Lets you set a target KB size when aggressive reduction is needed
- Keeps vector text sharp on text-heavy documents
Reduce PDF size for common limits
Many portals require PDFs under 1 MB, 500 KB, or even 200 KB. Use Smallest Size mode and the target slider on pdfcorpus. Image-heavy PDFs may not reach very small sizes without visible quality loss — the tool picks the best result for your file type.
PDF size reducer tips
- Try Good Quality first for text PDFs — often cuts size 30–60% with clear output.
- For scans, use Smallest Size and accept some image softening.
- Remove unused pages with Split PDF before compressing if only part of the file is needed.
- Always download immediately — pdfcorpus auto-deletes files after 2 minutes.