English offline CSV tool / 英語UIの買い切りCSV整備ツール。 Prepare a comma-separated CSV before an import or handoff. Select surrounding-space trimming, required columns and whether exact duplicate rows should be removed. Download a cleaned CSV, trim-change log and issue list. Missing values stay missing; no fuzzy merging or invented facts. Includes: standalone index.html, English guide, license, fictional input and three example output CSVs (7 files in one ZIP). Limits: 5 MB, 5,000 data records, 30 columns. No dependencies, account, data upload or automatic import. All CSV exports add an apostrophe to spreadsheet formula-like text (including negative-looking text). Review the issue list and your destination format. The change log records trimming; formula protection is described in the issue list. How to use: unzip, open index.html in a current desktop browser, load CSV, read columns, select rules, review and export. No autosave. The supplied example is fictional, not client results. Preview with fictional data: https://browser-workflow-notes.sutars.chatgpt.site/tools/csv-preflight-desk/ License: personal/commercial internal use in one organization; completed data outputs may be sent to clients. Do not redistribute/resell the blank tool or its source. Individual data-cleaning services and consulting are not included. Original AI-assisted product v1.0. Mandatory legal rights remain unaffected. 本体・ガイドは英語です。CSVの推測補完、実サイトへの取込、個別作業代行は含みません。価格は1,200円の買い切りです。