The tool automatically increases the contrast and sharpness of scanned pages in a PDF. The output is a file where text and lines become crisper and the background lightens, significantly improving the document's readability.
When this is useful
You have a scan of an old library form with a gray background and pale text that is difficult to decipher. Or you received a contract by email that was photographed with a phone in poor lighting, and you need to print it in acceptable quality.
Step-by-step instructions
- Upload the PDF file consisting of scanned images to the tool's page.
- If a slider or options are present, select the desired level of enhancement.
- Click the processing button and wait for it to finish, then save the improved document.
How to verify the result
Compare the original and processed files by zooming in on the page. Small text should become noticeably darker and easier to read. If the result looks too dark or unnatural, try running the processing again with a lower enhancement level.
Important limitations
The tool only works with raster images inside the PDF and does not enhance actual digital text. It cannot recover information that is completely absent from the original scan. Processing may increase the final file size due to the compression algorithms applied.