Compress PDF Files Online for Free
Compress and reduce the file size of your PDF documents directly in your browser without quality loss. Use one-click target presets (Under 100 KB, 200 KB, 500 KB, 1 MB) for government portals, NTA exams, job applications, and email attachments—processed 100% client-side with zero server uploads.
Upload your files or drag them here to start processing instantly in your browser.
How to Use PDF Compressor
- Select PDF Document: Upload the PDF file you want to compress from your device.
- Choose Optimization Mode: Select metadata stripping and stream compression options.
- Compress PDF: Click "Compress PDF" to execute client-side stream optimization.
- Download Optimized File: Save your compressed PDF with a smaller file size footprint.
Key Features & Benefits
Dual Compression Modes
Choose lossless metadata & object stream optimization for vector text, or raster downsampling for scanned documents.
Scanned Document Reduction
Downsample high-DPI phone photos and scanner images embedded in PDFs down to web-friendly sizes.
Strict Client-Side Privacy
Documents are processed locally in browser memory without sending private records to cloud servers.
No Watermarks or Signups
Compress unlimited educational files, assignments, and study materials without paywalls or branded stamps.
Privacy & File Limits
Client-Side Privacy: Our PDF compressor runs entirely on your local machine using client-side JavaScript. Your files are never sent over the internet or stored on our servers.
Usage Limits: Tested on real academic and scanned files up to 50 MB. Text-heavy PDFs achieve 0–25% reduction depending on existing object stream compression (already-optimized files are preserved without inflation). Scanned and image-heavy PDFs achieve 35–80% reduction (e.g. 78% on 5-page raster scans, 62% on scans with OCR text layers, while preserving 100% of OCR text).
Frequently Asked Questions
How does client-side PDF compression work?
The compressor cleans unused document metadata dictionaries, applies flate stream compression to internal objects, and restructures cross-reference tables. For scanned PDFs, it downsamples embedded raster images to target JPEG quality.
Does standard compression reduce the quality of vector text?
No. When using structural compression mode, vector typography and mathematical formulas remain 100% crisp and uncompressed without loss of clarity.
How much can I reduce the size of a scanned PDF document?
Scanned documents containing high-resolution camera photos can typically be reduced by 50% to 90% when using the Scanned Document Downsampling option.
Is my compressed PDF uploaded to any cloud storage?
No. All optimization algorithms run entirely inside your browser sandbox on your device. Your documents never travel over the network.
Can I compress a PDF to 100KB or 200KB for government exam portals?
Yes. Our PDF compressor features built-in Target Size Presets specifically calibrated for strict upload limits on government portals including MHT-CET, NTA JEE/NEET, UPSC, SSC, and state university admission portals (under 100 KB, 200 KB, and 500 KB).
Is this online PDF compressor completely free with no limits?
Yes, our online PDF compressor is 100% free with no file count limits, no hidden subscriptions, and no email registration required.