A free, no-upload and 100% private alternative to pdf24 to shrink your PDFs.
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Last updated : February 13, 2026
Free and complete
Desktop and online version
Good batch processing
Dated and unintuitive interface
Online version sends files to their servers
Ads in the free version
Heavy installation for the desktop version
Modern and clean interface
Guaranteed local processing — no server involved
Ad-free
No installation required
PDF24 (pdf24.org) is a popular tool, but it has significant limitations. The main difference with FreeConversion is privacy: unlike PDF24 which sends your files to remote servers, FreeConversion processes everything locally in your browser using WebAssembly technology.
This means your sensitive documents (contracts, resumes, bank statements) never leave your computer. Additionally, FreeConversion is 100% free with no file limits, no registration, and no ads.
Absolutely! FreeConversion is perfect for professional documents. Since all processing happens locally in your browser, your confidential documents remain 100% private.
FreeConversion handles large files directly in your browser. The limit depends mainly on your device's memory, but files up to 100MB are processed without issues.
The free and private alternative to PDF24. No limits, no registration.
Compress my PDFs for free →