Free PDF Compressor - Reduce PDF File Size
Shrink PDF bytes in your browser with pdf-lib. Local processing, before/after size stats, and no upload to WebTooly.
Drop a PDF file here or click to browse
Max file size: 50MB
About PDF Compressor
`pdf-lib` reload + `save({ useObjectStreams: true, addDefaultPage: false })` after `PDFDocument.load(arrayBuffer, { ignoreEncryption: true })`. This re-serializes the PDF; it is **not** a per-image JPEG recompression pipeline.
How it works (technical)
Savings depend on redundant structure in the source—some files shrink, some barely change.
Embedded photos are not batch re-encoded at a new quality; for that, use desktop prepress or extract/recompress images.
Encrypted PDFs usually fail until decrypted elsewhere.
UI shows original vs output `Blob.size`.
When to use it
Verbose exports
CAD or print pipelines that emit bloated object graphs may shrink on re-save.
Under upload caps
Try a smaller byte size before submitting to a portal.
Quick check
See whether a simple client-side pass helps your specific file.
How to Use PDF Compressor
- 1Upload your PDF file by dropping it or clicking to browse.
- 2Click "Compress PDF" to optimize your document.
- 3View the compression statistics showing size reduction.
- 4Download the compressed PDF with reduced file size.
Key Features
- `save` with `useObjectStreams`
- Before/after bytes
- Standard PDFs; encryption often blocks load
- Local download
Benefits
- •Honest size readout
- •Client-side only
- •No rasterization step
Frequently Asked Questions
How much can I compress my PDF?
Compression results vary depending on the original PDF content. Text-heavy documents typically compress more than image-heavy ones, with reductions of 10-50% common.
Will compression affect PDF quality?
This flow re-saves the PDF with pdf-lib; visible quality is usually unchanged. How much smaller the file gets depends on the original—some PDFs shrink a lot, others only a little.
Can I compress password-protected PDFs?
Encrypted or password-protected PDFs cannot be compressed with this tool. You'll need to remove the password protection first.
Is my data safe?
Yes, all processing is done locally in your browser.