Enhance a scanned document
Scans come in grey: show-through from the reverse side, dust speckles, muddy shadows where the page curved. Contrast stretching, a median filter and a white-point clamp pull the paper back to white and the ink to crisp black.
Drop your file here — or click to choose
PDF or image (JPG/PNG) · up to 100MB each · processing starts instantly, preview is free
1=轻度 10=强力（映射对比拉伸上限与白化力度），越界自动钳制
No signup needed. Only pay if you want the clean file.
How it works
- Upload the scanned PDF or image.
- Pick a strength (default 5; go higher for darker paper).
- Download the cleaned file — same page count, same format family.
Frequently asked questions
Will it remove show-through?
Mostly — the white-point clamp pushes light grey bleed to paper white. Very dark show-through needs a higher strength.
Coloured stamps or photos?
Colour is preserved; only levels are stretched. Heavily coloured pages may shift slightly.
When this tool is not the right choice
You want the opposite (fake a scan).
Use the Make It Look Scanned tool.
Use the Make It Look Scanned tool.