Corrupt an Excel Spreadsheet Online
Corrupt an Excel spreadsheet (.xlsx or .xls) online for free. Client-side XLSX corrupter that breaks the workbook package so Excel cannot repair it.
- Nessun caricamento
- Nessun limite di dimensione
- Nessuna registrazione
Corrompi il tuo file Excel
Calibrato per .xlsx, .xls, .xlsm, e funziona altrettanto bene con qualsiasi altro formato.
Perché i file Excel sono difficili da corrompere per bene
An .xlsx workbook is a ZIP archive of XML parts: worksheets, a shared string table, styles, relationships. Excel is unusually good at recovering from partial damage, so a handful of random flips normally produces a workbook that opens with a warning and all the data intact. To make it genuinely unreadable, the archive itself has to go.
Cosa distrugge questo strumento
- ZIP entry headers. Every local file header inside the package is destroyed, including
xl/workbook.xmland each worksheet part. - Central directory and EOCD. The archive index and its terminating record are overwritten, so the file no longer registers as a ZIP container.
- Relationship parts. The
_relsentries binding worksheets to the workbook are caught by the same pass. - Legacy .xls. Older BIFF workbooks are handled through their OLE compound header and FAT sector map.
Cosa vedrai dopo
| Applicazione | Comportamento |
|---|---|
| Microsoft Excel | "Excel cannot open the file because the file format or file extension is not valid." |
| Google Sheets | Import fails with an unsupported-file error. |
| Numbers on macOS | Refuses to import the workbook. |
| pandas / openpyxl | Raises BadZipFile, useful for testing error handling in data pipelines. |
Motivi comuni per farlo
- Testing an ETL job that ingests spreadsheets and must not crash on bad input.
- Confirming a finance or reporting tool shows a message rather than a stack trace.
- Generating malformed workbooks for an automated test suite.
- Demonstrating why version history and backups matter during training.
Come corrompere un file Excel
- Trascina il tuo file .xlsx nel riquadro qui sopra, oppure fai clic per sfogliare.
- Lascia il livello su Standard, a meno che tu non voglia un danno parziale (Light) o debba sconfiggere un software di recupero (Heavy).
- Premi Corrompi file. L'elaborazione avviene sul tuo dispositivo, quindi termina quasi subito.
- Scarica il risultato. Per impostazione predefinita mantiene il nome file e la lunghezza in byte originali.
Domande frequenti su Excel
Will Excel offer to recover the workbook?
It may offer, but recovery fails at Standard level and above. The container index is destroyed, so Excel cannot locate a single worksheet part to salvage.
Does it work on macro-enabled files (.xlsm)?
Yes. .xlsm uses the same package format as .xlsx and is handled identically.
What about CSV files?
CSV is plain text, so the engine switches to injecting invalid UTF-8 sequences throughout. Use the dedicated CSV corrupter for that.
Is there a file size limit?
None imposed by us. Processing runs in slices, so large workbooks are handled without exhausting memory.