Compress PDF Free — No Upload, No Watermark
Reduce PDF file size online for free with 100% privacy. Compress PDFs directly in your browser without uploading files to any server. Fast, safe, no size limits, and no watermarks.
How PDF Compression Works
Our compressor gives you full control over the size-quality trade-off. When you choose 100% quality, the PDF is losslessly re-packed — redundant objects are removed and streams are re-encoded without any visual change. Below 100%, each page is rendered to an image at the selected quality setting and re-embedded, which can dramatically shrink image-heavy or scanned documents while making text no longer selectable.
The quality slider lets you preview the estimated output size before you commit, so you can hit a specific target for email attachments, upload limits, or archival storage.
When to Use Each Quality Setting
- 100% (Lossless): Legal documents, contracts, forms, and any PDF where text must remain selectable and searchable.
- 80–90%: Presentations, reports, and mixed-content PDFs where you want a good balance of size reduction and visual fidelity.
- 60–75%: Scanned documents, photo-heavy PDFs, and images where slight softening is acceptable for much smaller files.
- Below 60%: Archival copies where storage space is the priority and visual quality is secondary.
Frequently Asked Questions
How do I reduce PDF file size free online?
Choose your PDF, select a quality level, and click Compress & Download. The smaller PDF is created free in your browser without uploading your file.
How can I compress a PDF file size for email or upload?
Use a lower quality setting when you need a smaller attachment. Image-heavy PDFs usually shrink the most while text-heavy PDFs may need a higher setting for readability.
How much can this compress my PDF?
It depends on the file. Image-heavy and scanned PDFs often shrink by more than half; you pick how much to trade off via the quality slider.
Does compression lower the quality?
At 100% quality pages are re-packed without loss. Below 100% the pages are re-encoded as images at that quality, so very low settings can soften fine text.
Will the text still be selectable after compression?
At 100% quality, yes. Below that, pages are rendered as images so text is no longer copyable — a common trade-off for much smaller files.
Does it work for scanned PDFs?
Yes. Scanned or image-based PDFs are the best fit for the quality slider and often compress the most.
How large a PDF can I compress?
Processing happens in your browser, so limits depend on your device memory and CPU rather than a server cap.
Are my PDFs private?
Yes. Compression is fully client-side — your file never leaves your device.