Observed arrival · 2026-09-19
Kuronuri Deletes the Data Under the Black Bar
A free browser tool that redacts My Number data and other sensitive regions from PDFs and images without sending files to a server.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- People sharing Japanese tax documents
- Worth noticing
- It checks whether text remains inside the selected redaction range before saving.
Field notes
The workflow distinguishes selectable PDF text from scanned or photographed pages: PDFs can retain searchable text outside selected ranges, while image-based pages become masked pixels and are not converted into searchable text. Automatic detection targets 12-digit sequences, but names, addresses, and missed numbers require manual boxes. The page also describes PNG export options, including a ZIP containing masked versions of all pages.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
One card from the complete issue