PDF Compressor
Reduce PDF file size with honest before/after reporting.
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About this tool
PDF Compressor trims the structural overhead inside a PDF — duplicate objects, unoptimized cross-reference tables, and wasted space — then rewrites the file in a compact form. To be honest about expectations: this reduces file overhead, and image-heavy PDFs see only modest gains, since the images themselves are already compressed.
The tool shows before-and-after sizes so you can judge the result yourself. Compression is lossless with respect to content: text, images, and layout are preserved. Everything runs locally in your browser.
How to use
- Upload a PDF file and note the original size.
- Click compress to rebuild the PDF with optimized object streams.
- Compare the before/after file sizes.
- Download the compressed PDF if the savings are worthwhile.
Frequently asked questions
It depends on the file. Text-heavy PDFs with structural overhead can shrink noticeably; image-heavy PDFs see modest gains because their images are already compressed. The tool reports exact before/after sizes so you can decide.
No. This optimization only restructures the file — it does not downsample images or touch content, so quality is identical.
If a PDF was already saved with object streams (most modern PDFs are), there is little overhead left to remove. The honest size report will show that.
No. Compression runs 100% in your browser.