Scan enhancer

Clean shadows, black borders and yellow paper.

Upload a scanned PDFLocal pixel cleanup, Bradley adaptive thresholding, shadow removal and dark-border crop.

Enhancement presets

Crop dark border

Render scale1.8Local window radius22Text sensitivity0.15Shadow removal0.45JPG quality0.9

Auto-downloads when done · all image processing runs in the browser sandbox

Output is an image-based cleaned PDF. Original hidden text layers are not preserved.

100% ブラウザ内ローカル処理