How to compress a PDF without uploading it anywhere

 If a PDF is too big to email, the usual advice is to run it through an online compressor. That means handing the file to a stranger. For a contract, an invoice or anything with client data in it, that is a bad trade.


You can compress a PDF entirely inside your browser instead. Ghostscript compiles to WebAssembly, so the compression runs on your own machine: the file is read from disk, processed in memory, and saved back out. Nothing is uploaded, nothing is stored, and there is no server that could leak it later.


Practical notes: image-heavy PDFs shrink the most (scans especially), text-only PDFs are already small so gains are modest, and very large files may need to be split first because browser memory is capped.


You can try it here: https://file-converter-free.com/compress-pdf

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