Start with balanced compression
Balanced compression is the safest first pass because it aims to reduce size while keeping documents readable for normal review and sharing.
PDF size reduction
How to Reduce Size of a PDF
Large PDFs often come from scanned pages, embedded photos, redundant document structure or heavy metadata. LessMB helps reduce PDF size locally in the browser before email, form uploads or document portals.
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Choose a PDF file and start with Balanced compression.
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Drag your PDF here or click to compress
Compress PDF files up to 200MB locally in your browser.
Steps
Quick workflow
Use this simple browser workflow to get a smaller file while keeping the original on your device.
- Open the PDF compressor.
- Select a PDF file up to the supported size limit.
- Choose Balanced for normal documents or Maximum for scanned PDFs.
- Review the result size and download the optimized PDF.
What to know before you start
Use maximum compression for scanned PDFs
Image-heavy scanned PDFs can shrink more when pages are rebuilt as compressed images, but searchability, links and form fields may be lost.
Keep sensitive documents local
Because LessMB runs in the browser, forms, reports and contracts do not need to enter a cloud queue just to become smaller.
FAQ
How to Reduce Size of a PDF FAQ
Short answers for the most common questions about this workflow and LessMB's local browser compression.
No uploadFree toolBrowser-based
How do I reduce PDF size without losing too much quality?
Start with balanced compression. Use maximum compression only when file size matters more than preserving every document feature.
Why is my PDF still large after compression?
Some PDFs are already optimized, or they contain high-resolution scans that need stronger image downsampling to become much smaller.
Does LessMB upload my PDF?
No. Supported PDFs are processed locally in the browser session.