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.
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
Tools for image conversion, format conversion, and metadata handling.They support EXIF removal, PDF conversion, and batch format conversion.
3 tools
Tools for merging, splitting, rotating, page operations, text extraction, image conversion, and other PDF workflows.All processing runs in the browser.
9 tools
Tools for text formatting, conversion, deduplication, line splitting, and data matching.CSV and Excel-oriented workflows are also covered.
7 tools
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
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Notes on practical observations and thinking, mainly around AI, marketing, and UX.
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