Clean Scanned PDF Online
Remove ugly shadows, grey backgrounds, and hand marks from your mobile scans.
Click to Upload Scan
PDF or Image (Max 20MB). Processed securely in browser.
Why Do Mobile Scans Look Grey?
When you take a photo of a document with your phone (using Notes or simple camera), lighting is rarely perfect. Your hand casts a shadow, or the room light creates a gradient across the page. This results in a "grey noise" background that wastes ink when printed and looks unprofessional.
The Solution: Adaptive Thresholding
This tool uses an algorithm similar to professional scanner apps (like CamScanner or Adobe Scan) but directly in your browser. It analyzes the local contrast of the image to distinguish text from the background shadows, effectively "flattening" the document into a crisp, white page.
How to Get the Best Result
- Lighting: Try to take the photo near a window with indirect sunlight.
- Angle: Hold your phone parallel to the paper to avoid perspective distortion.
- Contrast: Blue ink on white paper works best. Faint pencil marks might be lost if you set the "Whiten Background" too high.
Frequently Asked Questions
Is my document safe?
Yes. This tool runs Client-Side. We do not upload your sensitive financial documents or contracts to any server. The cleaning process happens right here in your Chrome/Safari browser.
Can this remove my finger from the scan?
It can reduce the shadow of a finger, but if your actual finger is covering the text, it cannot magically see what is underneath. For that, check out our "PDF Whiteout" tool.