PDF Compressor — Free Online Tool
Rewrite a PDF with PDF 1.5 object streams using pdf-lib. This is a lossless structural pass: it does not downsample embedded images, subset fonts, or deliberately remove metadata, so savings vary and already-optimized files may become no smaller.
100% client-side. No uploads. Your data never leaves your browser.
How to use PDF Compressor
- Upload the PDF you want to compress.
- The tool analyzes the structure and shows the original file size.
- Click 'Compress' to apply structural optimization.
- Download the compressed PDF and compare sizes.
Frequently Asked Questions
Does this reduce image quality?
No. The tool rewrites the PDF with object streams; it does not resample embedded images or render the pages.
Why did the file not get smaller?
Object-stream rewriting is not the same as image compression. A PDF that already uses compact object streams may stay the same size or become slightly larger.
Can I achieve greater compression by reducing image quality?
Not with this tool — it is lossless only. For lossy compression, use a service like Smallpdf that downsamples embedded images.
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