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Batch Compress PDF Online Free — PrivaTools

TL;DR: Drop up to 50 PDFs and download a ZIP where each is individually compressed — same Light/Recommended/Extreme presets as Compress PDF.

Batch compress multiple PDFs online for free — upload up to 50 files and compress them all in parallel. Choose light, balanced, or extreme compression. Download results as a single ZIP file. No sign-up, 500 MB per file.

Batch Compress PDF runs on the same privacy-first stack as every PrivaTools utility: files enter an isolated Docker container, are processed in temporary memory, and are unlinked the moment your download begins. No account, no watermark, no daily quota.

How to Batch Compress PDF with PrivaTools

  1. Upload multiple PDFs — Drag up to 50 PDF files. Up to 500 MB per file.
  2. Pick compression level — Light (modest reduction, best quality), Recommended (balanced — default), Extreme (smallest files, some image-quality loss).
  3. Compress and download as ZIP — Click Compress. Files are processed in parallel across 4 workers. Results are bundled into a ZIP with a savings summary.

Frequently Asked Questions

How many PDFs can I upload?

Up to 50 files per batch, up to 500 MB per file.

Are they compressed in parallel?

Yes — the backend runs 4 worker processes simultaneously, so 4 files compress at once. Total time scales nearly linearly with file count divided by 4.

What's the difference between Light, Recommended, and Extreme?

Light shrinks structure only (5–30% reduction, no visible quality loss). Recommended (default) resamples images at 150 DPI (40–70% reduction). Extreme drops to 96 DPI and lower JPEG quality (60–90% reduction).

Last reviewed 2026-04-30 by the PrivaTools maintainers. Source code on (MIT-licensed, self-hostable).

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