PDF Compressor Pro

Why Reduce PDF File Size?

Large PDFs create friction everywhere documents travel. Email providers cap attachments at 10–25 MB. Job portals, university systems, and government upload forms enforce strict limits. Cloud folders fill quickly when every scan, brochure, and report weighs in at dozens of megabytes.

A good PDF compressor solves this without turning your document into a pile of blurry screenshots. PDF Compressor Pro is built for that balance: meaningful size reduction on image-heavy and scanned files, while digital documents with real text layers keep their fonts, vectors, and copy-paste behavior intact.

How to Compress a PDF Online (4 Steps)

Hybrid Compression: Text Preserved, Images Optimized

Many online PDF tools rasterize every page — converting the entire document into flat JPEG images. That destroys selectable text, breaks accessibility for screen readers, and makes copy-paste impossible. PDF Compressor Pro takes a different approach.

Before compressing, the engine inspects each page for embedded text using PDF.js. Pages with searchable text are left structurally untouched: fonts, vectors, and layout remain exactly as authored. Pages without text — scans, photos, or image-only exports — are re-rendered at your chosen DPI and JPEG quality. On text pages, embedded photographs and illustrations are decoded, downscaled with Lanczos3 resampling via Pica, and re-encoded as PDF-native JPEG or PNG — but only when the result is genuinely smaller than the original.

• Text pages — preserved in place; no flattening, no loss of searchability.
• Scanned pages — rasterized at 72–150 DPI depending on your preset, with optional grayscale.
• Embedded images — individually recompressed; transparent graphics stay PNG, opaque photos become JPEG.
• Metadata — stripped and object streams enabled for additional structural savings.

Built for Every PDF Type

Your Files Never Leave Your Browser

Most free PDF compressors upload your document to a remote server for processing. That introduces privacy risk, uncertain data retention, and slower handling of large files. PDF Compressor Pro runs entirely client-side — the same model professionals expect when handling contracts, tax records, medical forms, and HR documents.

Four Compression Presets — You Choose the Trade-off

Not every PDF needs the same treatment. A presentation destined for print demands higher fidelity than a scan you need to email before a deadline. Choose the preset that matches your use case, then enable grayscale if the document is already black-and-white.

• Light — 150 DPI, 85% JPEG quality. Best for presentations, portfolios, and print-bound PDFs.
• Medium — 120 DPI, 70% quality. Recommended default for everyday documents and reports.
• High — 96 DPI, 55% quality. Suited for email attachments and portals with size caps.
• Maximum — 72 DPI, 40% quality. Smallest possible output when file size is the top priority.
• Grayscale — optional toggle that removes color data from scanned pages and embedded images for extra savings on monochrome documents.

Common Use Cases

• Email attachments — shrink a 15 MB report to fit a 10 MB inbox limit without retyping content.
• Job and university applications — meet strict upload size requirements for resumes, portfolios, and transcripts.
• Scanned receipts and invoices — compress phone-camera scans while keeping line items readable.
• Legal and financial documents — reduce size locally without sending contracts or statements to a third-party server.
• Ebook and manual archiving — free disk space on mixed text-and-image PDFs up to 200 MB.
• Print preparation — use Light preset to trim file weight before sending to a print shop.