FreeConversion vs PDFfiller

Discover why FreeConversion is the best free and private alternative to PDFfiller for compressing your PDFs.

Last updated : May 14, 2026

PDFfiller

Pros

+

Specialized in PDF form filling

+

Legally recognized electronic signatures (eSign)

+

Salesforce, Workday and other CRM integrations

Cons

−

$20/month for the Basic plan — pricey just for compression

−

Service centered on forms, not optimized for compression

−

Account required from the upload step

−

Airslate (Boston, USA) — files on their servers

See PDFfiller →
Recommended

FreeConversion

Why Choose Us

✓

Compression with no detour, that's what we do

✓

No signature suite to buy just to compress a PDF

✓

No upload, no account

Why switch from PDFfiller to FreeConversion?

PDFfiller (https://www.pdffiller.com) is a popular tool, but it has significant limitations. The main difference with FreeConversion is privacy: unlike PDFfiller 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.

Frequently Asked Questions

Is this PDF compressor free?

Yes, our PDF compressor is completely free. No hidden fees, no registration required, and no file size limits.

Can I compress multiple PDFs at once?

Currently, you can compress one file at a time. However, the process is very fast and you can compress as many files as you want consecutively.

What's the difference between compression levels?

Low compression (10-30% reduction) preserves maximum quality. Medium (30-50%) offers a good balance. High (50-70%) significantly reduces size with slight image quality loss. Maximum (70-90%) creates the smallest possible file.

Can I use FreeConversion for professional documents?

Absolutely! FreeConversion is perfect for professional documents. Since all processing happens locally in your browser, your confidential documents remain 100% private.

Other free alternatives

vs 11zonvs Adobe Acrobatvs Adobe Acrobatvs Adobe Acrobat Onlinevs AvePDFvs AvePDFvs EaseUS PDF Editorvs EaseUS PDF Editorvs FormatPDFvs FormatPDFvs Foxitvs Foxitvs Free PDF Convertvs Free PDF Convertvs LightPDFvs Nitro PDFvs Nitro PDFvs PDF Compressor (pdfcompressor.com)vs PDF24vs PDF24vs PDFCandyvs PDFCandyvs PDFGearvs PDFGearvs PDFZillavs PDFZillavs PDFelementvs PDFelementvs PDFescapevs PDFescapevs PDFfillervs Sejdavs Sejdavs Smallpdfvs Smallpdfvs SodaPDFvs SodaPDFvs SwifDoo PDFvs SwifDoo PDFvs UPDFvs Xodovs Xodovs iLovePDFvs iLovePDF

Ready to try FreeConversion?

The free and private alternative to PDFfiller. No limits, no registration.

Compress my PDFs for free →