When to use it
Use it for a viewing or email copy when upload limits matter more than selectable text, vector precision, searchable content, forms, or live links. Keep the original for editing, archiving, accessibility, and print production.
Compress PDF
Reduce PDF file size directly in your browser.
Everything runs in your browserNo account requiredPrivacy-firstv1.0.0Updated Aug 5, 2026
Processed in your browser. Your files stay on your device and are never uploaded to Dockzio servers.
Tool
Why Dockzio?
Simple tools that respect your time and your privacy.
Free and instant
No subscriptions, no paywalls, no waiting.
No sign-up required
Open a tool and get to work immediately.
Private by design
Processing happens locally in your browser whenever possible.
Beautifully built
Clean, fast interfaces designed for everyday productivity.
About PDF compress
Shrink a PDF in your browser with Light, Balanced, or Maximum presets. Browser-side PDF compression may produce modest savings depending on the document.
How it works
Dockzio renders each page, recompresses it as JPEG at your chosen preset, and rebuilds a new PDF locally with pdf-lib.
Presets
Light keeps more detail, Balanced is the default tradeoff, and Maximum prioritizes the smallest file size.
Text & links
Compressed pages become images, so text is no longer selectable and interactive links are not preserved. Keep a copy of the original if you need those.
Privacy first
Everything is processed locally in your browser. Your documents are never sent to a Dockzio server.
Practical guidance
Choose file-size reduction with the output purpose in mind
This tool reduces size by rendering pages and rebuilding them from compressed page images. That approach is predictable, but it changes the document’s internal structure.
Worked example
A 20-page scan may shrink substantially with Balanced compression because every page contains a large raster image. A 20-page text PDF with compact fonts and vector graphics may shrink little—or grow—after each page is rasterized.
Preset logic and output
Light uses higher image quality, Balanced trades detail for size, and Maximum favors the smallest output. Compare the reported before-and-after byte counts and reduction percentage; a smaller number alone is not a quality decision.
Limitations and production safety
Rasterization can soften small type and line art, alter effective image resolution, flatten transparency, remove selectable text, and discard interactivity. Do not treat the compressed copy as press-ready without checking color, trim, bleed, fine detail, and output requirements.
FAQ
Quick answers to common questions.
No. Everything is processed locally in your browser. Your documents never leave your device.
Browser-side PDF compression may produce modest savings depending on the document. Image-heavy PDFs often shrink more than text-only files. Try Light, Balanced, or Maximum to compare results.
Light keeps more visual detail, Balanced is the default tradeoff, and Maximum prioritizes the smallest file size.
No. Compressed pages are rebuilt as images, so text is no longer selectable and links are not preserved. Keep the original PDF if you need those features.
You can compress one PDF at a time, up to 25MB.
Yes. Dockzio Compress PDF is free to use with no account required.
Learning Center
Guides related to Compress PDF
Short explainers that pair well with this tool — concepts first, then practice.
- What Is PDF/X and Why It Matters7 min read→
- What Is PDF/A?6 min read→
- PDF Compression Guide8 min read→
- Merge vs Combine PDFs5 min read→