栅格化 PDF

Every page is rendered to a bitmap and the bitmaps are reassembled into a new PDF. The result looks the same but contains no text objects, fonts, layers, form fields, or hidden content, only a picture of each page, much like a photocopy.

150, the default, is fine for reading on screen and ordinary office printing. Use 300 for print-quality output or when someone will zoom in on fine print, 600 only for archival or professional printing, and 72 when the smallest possible file matters more than sharpness.

PNG is lossless, so text edges stay crisp, but files are bigger. JPEG (saved at quality 95) is noticeably smaller and works well for scanned or photographic pages, but can leave faint artifacts around sharp text. Grayscale is available with either and shrinks files further for black-and-white documents.

A text PDF stores a few kilobytes of font and glyph data per page, whereas a 300 DPI image of a Letter page is 2550 x 3300 pixels. Lower the DPI, switch to JPEG, or run the result through Compress PDF if size matters.

Not from the rasterized file itself; the operation is one-way, so keep the original. You can add a searchable text layer back with OCR PDF, though recognized text is never as exact as the original.

Flattening merges form fields and annotations into the page but keeps text as text. Rasterizing goes further and turns everything, text included, into pixels. If you only need to lock form fields or comments, Flatten PDF keeps the file searchable and much smaller.

No. Rendering is done by the PyMuPDF WebAssembly module running in your browser, so the pages are drawn and repacked on your own machine. That's what makes the tool a safe way to strip hidden text and layers from a sensitive file before sharing it.

Yes. Add as many as you like; each is processed with the same DPI, format, and grayscale settings, and the results download together as rasterized-pdfs.zip. A single file downloads on its own.