About This Site - Takanobu Saito（齊藤孝信）

Concept

A place to structure and preserve ideas gained through practice.

Personal Notes is a note site where I verbalize and accumulate observations from practical work in AI, UX, and marketing. It is not a learning site or explanatory media outlet. It is a place for externalizing my own thinking and leaving it in a reusable form.

Many articles begin from a question or observation and then organize it into structure. Rather than presenting a single correct answer, this site values recording the process of how a topic became easier to understand.

Themes Covered

AI How to use and choose AI, its fit with thinking styles, work views in the AI era, knowledge design, and related themes.
Rather than treating AI only as a tool, the notes focus on recording the perspective of seeing it as part of thinking and structure.
UX UX design processes, information architecture, and user flows.
The category mainly contains documents that organize actual design cases and design thinking.
Marketing Marketing strategy, structural design, hypothesis design, and related topics.
The focus is on organizing practical knowledge from the viewpoint of design and structure rather than only analysis.
Note Observations and ideas that do not fit neatly into the categories above.
This includes broader notes on skills, development perspectives, and ways of thinking in the AI era.
Self-made tools A collection of browser-based tools created for practical work.
They include PDF operations, text processing, image conversion, calculation tools, and other utilities.
They run without requiring an external server.

Tools

Self-made tools - free, browser-based, no server-side data storage

All tools are free to use. Processing is completed in the browser with JavaScript, and the entered data is not sent to an external server or stored on this site.

Even when handling confidential documents or private company data on a work PC, the data does not leave the network. Unlike typical web services, the tools are designed so that no security concern arises from server-side upload or storage.

Calculate

Calculate

Tools for numerical calculation, inverse calculation, and statistical judgment. They can be used for savings goals, weight loss planning, and A/B test significance checks.

3 tools
Image

Image

Tools for image conversion, format conversion, and metadata handling. They support EXIF removal, PDF conversion, and batch format conversion.

3 tools
PDF

PDF

Tools for merging, splitting, rotating, page operations, text extraction, image conversion, and other PDF workflows. All processing runs in the browser.

9 tools
Text

Text

Tools for text formatting, conversion, deduplication, line splitting, and data matching. CSV and Excel-oriented workflows are also covered.

7 tools
App

App

Browser-based local apps for task management, slide editing, WBS planning, and similar practical workflows. Data is stored locally and not sent externally.

9 tools