In developmentThis tool is still in development. It needs a server component that is not switched on yet, so it will not convert files in your browser right now. The 57 browser tools work fully today — this one is coming soon.
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Requires server
This tool needs a server — and isn't switched on
Unlike the 57 browser tools here, this one genuinely can't run in your browser. Office-format conversion, PDF encryption, and deep image compression need software that only exists server-side.
If you're the site owner: deploy the reference server in /server, then set API.enabled = true in assets/api.js.
Uploads to server
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How it works
- This is the tool our browser-based compressor honestly told you it couldn't be. Ghostscript re-encodes and downsamples the embedded images, which is where PDF bulk actually lives.
- Expect 50–90% reduction on scan-heavy PDFs, versus the ~5% a browser can manage. That difference is exactly why this one needs a server.
- Compression is lossy — higher settings visibly degrade images. Check the result before discarding your original.
- This tool uploads your file to a server — unlike every browser-based tool here. The server processes it and deletes it immediately; it is never stored. But if that tradeoff matters to you, use the client-side tools instead, where the file provably never leaves your device.