PDF Compressor
Reduce PDF file size without losing quality. Three compression levels. Runs in your browser — no upload, free.
Drop PDF here or click to browse
Supports PDF files
About PDF Compressor
The PDF Compressor reduces the size of PDF files using three configurable compression levels — light, balanced, and aggressive — all running locally in your browser. No files are uploaded to a server. Ideal for meeting email attachment limits, portal upload restrictions, or just making files more shareable.
Use Cases
- →Shrink a large PDF to fit within an email attachment size limit
- →Compress scanned documents before uploading to a government or HR portal
- →Reduce the size of a PDF portfolio for web distribution or client sharing
- →Batch-compress invoices, contracts, or reports for efficient archiving
Tips
- ✓Balanced compression usually offers the best quality-to-size trade-off for most documents
- ✓Images embedded in PDFs benefit most from aggressive compression — text is unaffected
- ✓For text-heavy PDFs without images, use light compression to preserve maximum quality
Frequently Asked Questions
The compressor re-encodes images inside the PDF at lower quality and applies stream compression. Text and vector graphics are not affected — only embedded bitmap images are reduced.
Low: fastest, minimal size reduction, highest image quality. Medium: balanced (recommended for most documents). High: maximum size reduction, lower image quality.
No. All compression happens entirely in your browser using PDF-lib. Your file never leaves your device.
PDFs that contain mostly text and vector graphics have very little image data to compress. Size reduction only applies to embedded raster images.
Password-protected PDFs cannot be processed — you will see an error. Standard PDFs (including PDF/A) work fine.
There is no enforced limit — the tool is bounded only by your browser memory. For most documents (under 100 MB), compression completes in a few seconds.