Enhance
Apply flatbed-quality scan filters — grayscale, high-contrast black & white, or a color boost — plus brightness and contrast, all in your browser.
There is no upload endpoint — your files are processed in this browser tab. Open your network tab and check. See how it stays private.
How to enhance a scanned document
- Add a page. Bring in a scanned or imported page.
- Pick a filter. Choose grayscale, black & white, or color boost.
- Adjust. Tune brightness and contrast for clean, readable output.
- Apply. Enhance all pages, then continue to export.
Lighting is what betrays a phone scan — shadows, gray backgrounds, uneven exposure. Scan filters counteract that: black & white thresholding turns a dim photo into crisp document-grade text, grayscale preserves subtle marks, and color boost keeps anything that needs to stay colorful readable.
The brightness and contrast controls let you rescue an over- or under-exposed capture rather than re-shooting it, and applying across the session keeps a multi-page document uniform.
Square pages up first with Crop & de-warp and Deskew, then finish with Build PDF, add OCR, or shrink with Compress scan.
Frequently asked questions
Which filter should I use?
Black & white is best for text documents and smallest in file size; grayscale suits pages with pencil or shading; color boost keeps stamps, highlights, and photos vivid.
Does the black & white filter make text sharper?
Yes. High-contrast thresholding removes the gray haze of uneven lighting, leaving crisp black text on white — the classic clean-scan look.
Can I apply a filter to every page at once?
Yes — the chosen filter and adjustments apply across the whole scan session for a consistent result.
Are my pages uploaded to filter them?
No. Filtering is canvas work done in your browser tab, so the pages never leave your device.
Related tools
- Crop & de-warpDetect page corners and flatten the perspective so a photographed document looks like a flatbed scan. Adjust the corners by hand any time.
- DeskewAuto-detect the skew angle of a scan and straighten every page without clipping content — pure canvas, runs on your device.
- Build PDFAssemble your captured pages into a single PDF with your choice of page size and margins — built locally with pdf-lib, never uploaded.
- Compress scanRe-encode scanned pages to smaller JPEGs and control the quality, so an email-friendly PDF stays readable. All the work happens on your device.