Local PDF compression

Free Online PDF Compressor

Reduce PDF file size for email, forms, reports and document portals. LessMB optimizes supported PDFs in the browser and keeps sensitive documents on your device.

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Drag your PDF here or click to compress

Compress PDF files up to 200MB locally in your browser.

How it works

Free Online PDF Compressor for private browser workflows

Reduce PDF file size in your browser

Choose a PDF file up to 200MB and select a compression mode. LessMB can optimize document structure or rebuild image-heavy PDFs for stronger size reduction.

Choose balanced or maximum compression

Balanced settings preserve clarity for many documents. Maximum compression can shrink scanned PDFs more aggressively, but may remove text selection, links, forms and annotations.

Private document handling

PDF processing runs locally during the current session. This is useful for forms, contracts, reports and other documents you do not want to upload to an unknown cloud queue.

Common use cases

Make reports and forms small enough to send through strict attachment limits.

Email attachments

Downsample image-heavy documents when file size matters more than perfect preservation.

Scanned PDFs

Prepare PDFs for upload limits in school, government, HR and client systems.

Work portals

Related guides

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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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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FAQ

Free Online PDF Compressor FAQ

Answers for the most common questions about this compressor, supported workflows, and local browser processing.

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How do I compress a PDF file for free?

Select a PDF, choose the compression level and download the optimized result. LessMB performs the work locally in your browser.

Will PDF compression reduce quality?

It can. Stronger compression often downscales embedded images. Use balanced settings when text clarity and document fidelity matter more.

Are my PDF files uploaded?

No. LessMB processes supported PDFs locally in the current browser session rather than sending them to a remote server.

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