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Compress PDF

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

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.

How to Use

Upload a PDF, choose the compression level that best matches your goal, and start the process. Low compression favors appearance, medium is a balanced default, and high is better when file size matters more than image quality. This is useful before sending email attachments, uploading application materials, or sharing documents through systems with strict file-size limits. If the PDF already contains mostly text, expect modest savings. If it contains scans or photos, the reduction is often more noticeable.

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.

FAQ

Why are scanned PDFs easier to compress?
They usually contain larger embedded images, which offer more room for size reduction than plain text pages.
Will compression always make a huge difference?
No. Some PDFs are already optimized, so the output may only be a little smaller.
Should I choose high compression every time?
Only when size is the priority. For readable scans and client-facing documents, medium is often the safer balance.

Privacy Reassurance

Compression happens in the browser and DailyToolStack does not need to retain your file just to reduce its size. That gives you a safer option for common paperwork, school documents, and internal sharing tasks.

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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