Okinawa Software Lab

In-house DX lead at a small company in Okinawa, Japan. I build the tools we need and publish offline-only PDF apps on the Microsoft Store — nothing leaves your PC.

Joined on Sep 16, 2026 https://okinawasoftwarelab.com/en/

Sep 24

I rebuilt my "export PDF text for AI" feature three times in one day. Here's what each version got wrong.

#pdf #ai #security #python

11 min read

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Okinawa Software Lab

Sep 24

I ran my file-type detector over 8,900 real files. It was wrong in ways no test suite would have told me

#python #testing #security #regex

16 min read

Okinawa Software Lab

Sep 23

pdfium and pypdf return different text from the same PDF — four mismatches to know before you feed PDFs to an LLM

#pdf #python #security #ai

16 min read

Okinawa Software Lab

Sep 17

Catching "invoice.pdf.exe" before you open it: a tool that identifies a file's real type from its first bytes

#showdev #python #security #cybersecurity

18 min read

Okinawa Software Lab

Sep 16

I built a tool that finds "invisible text" hidden in PDFs — white text, tiny fonts, and the invisible render mode

#pdf #python #security #ai

17 min read

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Okinawa Software Lab

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Writing Debut

I rebuilt my "export PDF text for AI" feature three times in one day. Here's what each version got wrong.

Want to connect with Okinawa Software Lab?

I ran my file-type detector over 8,900 real files. It was wrong in ways no test suite would have told me

pdfium and pypdf return different text from the same PDF — four mismatches to know before you feed PDFs to an LLM

Catching "invoice.pdf.exe" before you open it: a tool that identifies a file's real type from its first bytes

I built a tool that finds "invisible text" hidden in PDFs — white text, tiny fonts, and the invisible render mode