100% Local Processing

Compress PDF Size — Offline & Private

Reduce PDF file size for email or sharing. Processed in your browser — your document never leaves your device.

100% Offline Processing

Browser-Based PDF Compression That Stays on Your Device

Cloud compression services scan your document structure on their hardware to optimise it. That's necessary when you don't have a local engine — but it also means your file leaves your machine. OfflinePDF compresses PDFs using the pdf-lib JavaScript library running in your browser tab. The compression rewrites the internal PDF structure: removing redundant objects, optimising cross-reference tables, and shrinking embedded data — without any server involvement.

📉 Real Size Reduction
The compressor targets structural bloat — duplicate objects, redundant streams, and unoptimised cross-references — which can cut 20–60% from typical PDFs.
🔐 No Cloud Exposure
Financial reports, medical scans, legal briefs — files that should never transit a third-party server. They don't here.
⚡ Instant Results
Compression runs synchronously in your JavaScript engine. No server queue, no upload bar, no waiting.
🆓 Free, Always
No account, no daily limit, no tier restrictions.

OfflinePDF vs Typical Online Tools

FeatureOfflinePDFTypical Online Tools
Uploads your PDFNeverAlways
Server-side processingNoneAlways
Works offlineYesNo
Output watermarkNeverFree tiers often add
Daily usage limitNoneTypically 2–5 free

Frequently Asked Questions

It depends on the source. PDFs with lots of duplicate internal objects compress the most — commonly 20–60%. Image-heavy PDFs may see less reduction since images are already encoded.

This tool focuses on structural compression, not image re-sampling, so visual quality is maintained.

Currently one file at a time. For bulk compression, refresh and repeat.