Free · Private · Instant
Compress PDF
Reduce PDF file size in your browser. Nothing is uploaded.
Drop PDF files here
or choose files · .pdf files
Files stay on your device — nothing is uploaded
How PDF compression works
PDF files are made up of objects — pages, fonts, images, streams, and metadata. When a PDF is created or edited repeatedly, it can accumulate redundant cross-reference entries, duplicate objects, and unoptimized stream data. This tool re-packs the file using object stream compression, which groups multiple objects into a single compressed stream.
The result is a smaller file with identical content. Unlike tools that downsample images to reduce size, this approach preserves every pixel and every character.
How to compress a PDF
- 1
Drop your PDF
Drag a PDF onto the compressor or click to browse. You can compress multiple files at once.
- 2
Wait for compression
The compression runs in your browser using JavaScript — no upload required.
- 3
Download the compressed file
Click Download next to each file to save the compressed version. The size reduction is shown next to the filename.
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Frequently asked questions
About Compression
It depends on what's in the PDF. Files with a lot of redundant structure (many small objects, unoptimized cross-reference tables) can shrink significantly. PDFs that are already well-optimized may see minimal reduction. The tool shows you the exact savings after compression.
No. This tool reorganizes the PDF's internal structure and deduplicates objects — it does not re-encode images or alter content. Text, images, and formatting remain identical.
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