Turn a color PDF into grayscale (black & white) right in your browser — handy for cheaper printing. Nothing is uploaded; the conversion runs on your device.
100% プライベート — ファイルはブラウザ内で変換され、アップロードされることはありません。
Drop a PDF — it loads locally.
Every page is rendered in shades of gray on your device.
Save the grayscale PDF.
Grayscale PDFs are smaller and cheaper to print, since they use no colored ink. It's also useful for a cleaner, uniform look.
Pages are rendered to grayscale images, so the result is image-based. If you need selectable text, keep your original alongside the grayscale copy.
No. The conversion runs entirely in your browser using JavaScript — your file never leaves your device, so it's safe even for sensitive documents.
Yes — completely free, no signup, no watermark, and no daily limits.