Excel 列名と番号の相互変換

Overview

Excel Column Letter Converter is a Developer tool. Excel column name converter: convert between letters and numbers A1 AB28 XFD16384 bidirectionally with batch for spreadsheets, with one-click copy and offline. It runs 100% in your browser with no upload, so you get instant results with privacy. Whether you need a quick answer or batch processing with precise control, you can enter, validate and export in seconds. The UI is responsive on mobile, tablet and desktop and supports one-click copy.

Use cases

• Daily use of Excel Column Letter Converter: Enter a column letter (e.g. AB) or number (e.g. 28); the converter auto-detects the direction. — enter and get instant results without manual lookup.
• One-click copy keeps results ready to save, check or share with family and pros.
• Use Excel Column Letter Converter offline or on poor network — all calculations stay local and private.
• Convert between CSV/JSON/Markdown
• Test regex with highlights

How to use

1. 1 Enter a column letter (e.g. AB) or number (e.g. 28); the converter auto-detects the direction..
2. 2 Pick action and options
3. 3 Fix highlighted errors
4. 4 Copy or export

Highlights

• Local & private: processing stays in your browser
• Live validation with tolerant parsing
• One-click copy and export for docs, code or sheets
• Batch and offline support under poor network

Notes

• Disable live validation for large files
• Strict JSON disallows comments/trailing commas
• Watch greedy vs lazy regex

FAQ