Vellum cleans up a scanned document by stretching tonal levels to whiten the background, boosting contrast, and sharpening text when needed. Three rendering modes are available: revived color, cleaned-up grayscale, or black and white via an automatic threshold. A before/after preview lets you fine-tune the settings before generating the PDF. All processing happens in your browser — no page is ever sent to a server.
Three renderings are available: revived colour, cleaned-up grayscale, or black and white via an automatic threshold. A before/after preview lets you fine-tune the result before generating the final PDF.
No, the document produced is made of images: the text is no longer selectable or searchable. Optical character recognition (OCR) is needed afterwards if you need to search or copy the text.
Yes, all processing happens in your browser, with no page ever sent to a server. The tool is free, and a password-protected PDF must be unlocked first.
Vellum — free PDF tools whose processing stays on your device.