How do I compress a PDF file?

Upload your PDF, choose a compression level, then click Compress PDF to download the smaller file.

Is this PDF compressor free?

Yes. DailyToolStack PDF Compress is completely free and requires no signup.

Are my PDF files uploaded to your server?

No. Your PDF is processed locally inside your browser. Nothing is uploaded or stored.

Why does compression sometimes reduce size only a little?

Some PDFs are already optimized. Scanned or image-heavy PDFs usually compress better than text-only documents.

Compress PDF

Reduce PDF file size with adjustable compression levels. Fully browser-based (no upload). Best results for scanned/image PDFs.

Upload PDF

Compression Level

Tip: If your PDF is already optimized, reduction may be minimal. Scanned PDFs compress the most.

Tip: Compression results depend on the PDF. Scanned/image PDFs usually compress better than text-only PDFs.

Privacy-first: Everything runs locally in your browser. Nothing is uploaded or stored.

How PDF compression works

PDF compression typically reduces file size by optimizing embedded images, removing unnecessary objects, and rebuilding the PDF structure. Image-heavy or scanned PDFs see the largest size reductions.

Best use cases

Compress PDFs before emailing, uploading assignments, submitting applications, or sharing documents online. Smaller PDFs upload faster and are easier to store and send.

Related PDF Tools

Continue your workflow with other DailyToolStack PDF utilities.

Merge PDF

Combine multiple PDFs into one clean file.

Split PDF

Extract a page range or split every page.

PDF to Images

Export each PDF page as a high-quality PNG image.

Want more PDF tools?

DailyToolStack includes merge, split, OCR, watermark, rotation, conversion, and more — built for fast workflows.

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