XLS Won't Open? Convert to XLSM Instantly
Fast, instant XLS to XLSM conversion. No signup required. Just drop your .xls file and get .xlsm in seconds.
Batch Settings
日々の業務でExcelファイルは欠かせない存在ですが、マクロを組み込んだ複雑な処理を行う際、互換性やセキュリティの面で課題を感じることはありませんか？特に、日本のビジネスシーンでは、定型業務の自動化やデータ集計においてマクロの活用が頻繁に見られます。しかし、標準的な.xls形式ではマクロが保存されず、共有時にその機能が失われてしまうことがあります。そこで重要になるのが、マクロを内包できる.xlsm形式への変換です。この変換を行うことで、作成者の意図した通りの機能性を保ちつつ、ファイルを安全かつスムーズに共有・運用することが可能になります。私たちは、お客様が直面するこうした課題に対し、シンプルかつ確実な解決策を提供いたします。大切なデータとロジックを失うことなく、より効率的なワークフローを実現するための一歩を、ぜひ私たちとお踏みください。
- 経費精算の自動化
- 顧客リストの一括処理
- 月次報告書の自動生成
日本の企業では、縦書きの帳票文化が根強く、Excelで作成された書類もその影響を受けることがあります。XLSM形式は、このような複雑な書式設定やマクロによる自動調整を保持する上で特に有効です。
About XLS to XLSM Conversion
Dealing with a XLS file that won't open on your device? You're not alone — XLS compatibility issues are one of the most common reasons people search for a file converter. XLS is the legacy Excel format (pre-2007) — still encountered in business workflows.
The fix is simple: convert your XLS to XLSM. XLSM is a widely used file format. This conversion lets you convert between formats quickly, solving the problem in seconds rather than hours of troubleshooting.
Converting XLS to XLSM maintains high quality with CocoConvert's optimised encoder settings.
CocoConvert processes your XLS file on secure servers in Germany — upload, convert, download. Your files are encrypted via TLS and automatically deleted within 24 hours. No account needed, no software to install, and it works on any device with a browser.
This conversion is ideal when you When you need a XLSM file.
The conversion engine behind CocoConvert uses FFmpeg, Sharp, and qpdf — the same open-source libraries trusted by Netflix, YouTube, and enterprise platforms. Pro users can batch convert up to 100 files at once.
How to Convert XLS to XLSM
- 1
Add your XLS file
Drag and drop your .xls file into the converter, or tap "Browse" to pick it from your device. Multiple files are supported for batch processing.
- 2
Pick XLSM output
Select .xlsm as the target format. CocoConvert automatically applies the best quality settings for this conversion.
- 3
Start conversion
Hit the Convert button. The spreadsheet engine processes your file server-side — no CPU drain on your device.
- 4
Save your file
Once done, download your .xlsm file. For batch jobs, download all at once as a zip.
What Happens When You Convert XLS to XLSM
Your XLS file is decoded and re-encoded as XLSM.
Your XLS file is uploaded and validated
The file is decoded (parsed into its raw data)
The data is re-encoded in XLSM format
The converted file is ready for download
Format Comparison
XLS
.xls file
| Extension | .xls |
| MIME Type | application/vnd.ms-excel |
| Category | Spreadsheet |
XLSM
.xlsm file
| Extension | .xlsm |
| MIME Type | application/vnd.ms-excel.sheet.macroEnabled.12 |
| Category | Spreadsheet |
Should You Convert XLS to XLSM?
When to Convert
- ✓When you need a XLSM file
Frequently Asked Questions
Why won't my XLS file open?
XLS files may not open if your device lacks the right codec or application. Converting to XLSM — a more widely supported format — usually resolves this. XLSM is a widely used file format.
Is it safe to convert XLS to XLSM online?
Yes. CocoConvert encrypts your file via TLS, processes it on isolated servers in Germany, and permanently deletes it within 24 hours. Your files are never shared or analysed.
Will I lose quality converting XLS to XLSM?
Converting XLS to XLSM maintains high quality with CocoConvert's optimised encoder settings. CocoConvert uses high-quality encoder defaults to preserve as much fidelity as possible.
How large can my XLS file be?
Free users can convert files up to 250 MB each. Pro users get a 5 GB limit per file, and Business API users have custom limits.
Can I convert XLS to XLSM on my phone?
Absolutely. CocoConvert works in any modern browser — iOS Safari, Android Chrome, and all desktop browsers. No app required.
Versions are pinned in our worker Dockerfile and re-built via CI on every change.