XLSB は Excel のバイナリブック形式です。大きなデータを高速に開き、保存できます。
Typical use: 巨大なブックは XLSX に変換して互換性を確保します。
About the XLSB format
XLSB は Excel のバイナリブックです。大きなデータを高速に開けて保存できます。
互換性を優先する場面では XLSX への変換が無難です。マクロを含む運用で選ばれます。
Strengths
- ✓ 開く・保存が速い
- ✓ ファイルがやや小さい
- ✓ 大規模データに強い
Limitations
- ✗ 他ソフトの対応が弱い
- ✗ 中身を直接は読めない
- ✗ Few third-party readers outside Excel/SheetJS
- Structure
- Binary OOXML container (.bin parts)
- Types / schema
- Same cell model as XLSX
- Compatibility
- Excel 2007+, SheetJS
- Best for
- Very large calculation-heavy workbooks
Convert XLSB to…
10 direct directions plus 3 workflows, sorted A–Z; 🔥 marks popular targets.
Cross-engine workflows
Frequently asked questions
What is a XLSB file?
XLSB is Excel's binary workbook format: identical content model to XLSX, packed in a binary container that opens and calculates faster on huge sheets.
How do I convert XLSB files online?
Pick a target format from the "Convert XLSB to…" list below, drop your file and hit convert. Everything runs in your browser — no install, no upload, no watermark, no limits.
Is it safe to convert XLSB files here?
Yes. Every conversion is performed by your own device inside the browser — files never leave for a server, and the page keeps working even offline.
Which formats can XLSB convert to?
This page lists all 13 directions across documents, images, audio, video, spreadsheets and archives — each one is its own free converter page.