Yes, this PDF compressor is 100% free with no hidden charges, no signup required, and no daily usage limits. You can compress as many PDF files as you need without paying anything.

Your files never leave your device. All compression happens entirely inside your web browser using client-side JavaScript and HTML5 Canvas rendering. No data is uploaded to any server, stored in any database, or shared with any third party.

This tool re-renders each PDF page onto an HTML5 Canvas and rebuilds the PDF using JPEG-compressed page images. Text-heavy PDFs can be reduced by 60-90%. The visual quality depends on your chosen compression level. At lower quality settings, text may appear slightly softer but remains fully readable. This is a rasterization-based approach, so the output contains image pages rather than selectable text.

Yes, in most cases you can achieve this by setting the quality slider to a lower value (20-40%). The tool re-renders each page as a compressed JPEG image, which allows aggressive size reduction. A typical 4 MB document with 10-15 pages can often be compressed to 200-500 KB depending on page content and the quality level you choose.

Yes, this compression method converts each page into an optimized image. The resulting PDF will look identical to the original but text will not be selectable or searchable. If you need selectable text, use a server-based PDF optimizer like Adobe Acrobat. For sharing, printing, or archiving purposes, the image-based output works perfectly.

Since processing happens in your browser, the limit depends on your device memory. Most smartphones handle PDFs up to 20-30 MB comfortably. Desktop browsers can process files up to 50-100 MB. For very large files, close other tabs to free memory.

No, encrypted or password-protected PDFs cannot be rendered by the browser. You need to remove the password protection first, then compress the file.

The quality slider controls JPEG compression of each rendered page. At 10% quality, you get maximum compression with noticeable quality loss. At 90%, the output looks nearly identical to the original but with less size reduction. For most documents, 30-50% quality provides a good balance between small size and readability.

Yes, the resolution scale controls how many pixels are used to render each page. A scale of 1.0 renders at screen resolution which is sufficient for on-screen viewing. A scale of 1.5 provides better quality for printing. Higher scales produce larger files. For maximum compression, keep the scale at 1.0.

Yes, scanned PDFs often compress very well with this tool because they are already image-based. The tool re-renders and re-compresses the images at your chosen quality level, which can significantly reduce file size — often by 50-80% for scanned documents.