Best for reports, scans and forms
LessMB can reduce file size for many common PDFs, especially documents with embedded images, scanned pages or redundant structure.
Free PDF compressor
Compress PDF File Size Online
Use LessMB when a PDF is too large for email, upload forms or shared workspaces. Choose a compression mode, process the file locally, and download a smaller document.
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Compress PDF files up to 200MB locally in your browser.
What to know before you start
Choose the right compression mode
Standard mode is fast, high mode preserves more structure where possible, and maximum mode is strongest for image-heavy files.
Check the final size before using it
Some PDFs cannot shrink much. LessMB shows the original and optimized sizes so you can decide whether the result is useful.
FAQ
Compress PDF File Size Online FAQ
Short answers for the most common questions about this workflow and LessMB's local browser compression.
No uploadFree toolBrowser-based
Can I compress PDF file size for free?
Yes. LessMB offers free PDF compression in the browser for supported files.
Which PDF compression mode should I use?
Use balanced settings first. Use maximum compression for scanned PDFs when the smallest file size is more important than preserving text selection or links.
Are PDF files sent to a server?
No. LessMB handles supported PDF compression locally in your browser.