When this tool is useful
Improving legibility of ordinary monochrome receipts, forms, typed pages, and photocopies with uneven paper tone or isolated dust before review or PDF assembly.
How local processing works
The browser computes a bounded local luminance reference around each pixel, applies the selected offset to form a black-and-white result, labels connected dark components within fixed budgets, and removes only components no larger than the speck setting.
How to use it
- Prepare and preserve the source: Keep an unchanged source, choose one supported static image, and start with conservative settings. Improving legibility of ordinary monochrome receipts, forms, typed pages, and photocopies with uneven paper tone or isolated dust before review or PDF assembly.
- Run the bounded local operation: Process the decoded pixels in this browser; stop and adjust instead of accepting an ambiguous result. The browser computes a bounded local luminance reference around each pixel, applies the selected offset to form a black-and-white result, labels connected dark components within fixed budgets, and removes only components no larger than the speck setting.
- Inspect the flattened result: Compare every page with the source at 100%, especially decimal points, punctuation, signatures, faint strokes, stamps, tables, and page numbers; reopen the PNG and retain the original scan as the authoritative record.
Important limitations
Cleanup is destructive and does not perform OCR, semantic document repair, color restoration, dewarping, or handwriting recognition. Fine punctuation, decimal points, thin strokes, halftones, stamps, photos, and faint marks can be removed or merged by aggressive settings.
Verify the downloaded result
Compare every page with the source at 100%, especially decimal points, punctuation, signatures, faint strokes, stamps, tables, and page numbers; reopen the PNG and retain the original scan as the authoritative record.
Private by design
Your files stay in this browser. The tool does not upload the source or output to our servers.
Questions and answers
When is this tool useful?
Improving legibility of ordinary monochrome receipts, forms, typed pages, and photocopies with uneven paper tone or isolated dust before review or PDF assembly.
What does the local operation do?
The browser computes a bounded local luminance reference around each pixel, applies the selected offset to form a black-and-white result, labels connected dark components within fixed budgets, and removes only components no larger than the speck setting.
Which limitations matter?
Cleanup is destructive and does not perform OCR, semantic document repair, color restoration, dewarping, or handwriting recognition. Fine punctuation, decimal points, thin strokes, halftones, stamps, photos, and faint marks can be removed or merged by aggressive settings.
How should I verify the result?
Compare every page with the source at 100%, especially decimal points, punctuation, signatures, faint strokes, stamps, tables, and page numbers; reopen the PNG and retain the original scan as the authoritative record.