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Convert CSV to Excel (XLSX) online for free. Turn comma-separated data into a formatted spreadsheet. Fast, secure — no signup, no software.
Tamaño máximo de archivo 10 MB. Inscribirse para más.
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CSV → XLSX is what you do when you've exported data from a database, analytics tool, or SaaS report as CSV but need Excel formulas, pivot tables, or charts on top. Preserves the raw data, adds an Excel-native structure. For very large CSV files (>1 M rows) Excel is not the right tool — Google Sheets caps at 10 M cells; better to query directly via BigQuery / Postgres.
XLSX is Excel's modern format — preserves formulas, formatting, multiple sheets, charts. Convert to XLSX when the recipient will interact with the data in Excel or Google Sheets (pivot tables, financial modelling, forecast workbooks). Overkill for one-off tabular data — CSV is lighter and more portable.
A spreadsheet conversion moves cells, sheets, and values from one container to another. Knowing what each format keeps — and what it drops — saves a lot of "where did my formulas go" surprises.
Drop the CSV file above or click to browse. Free-tier uploads are capped at 10 MB — comfortably enough for tens of thousands of rows; Pro handles files up to 1 GB. The filename is preserved and the new extension is appended automatically.
Cell values, columns, and rows are read from the CSV and written into the XLSX structure. When both formats are spreadsheet-native (XLSX, XLS, ODS), formatting, multiple sheets, and formulas are preserved. When the target is CSV — a plain-text grid — the converter exports the values as clean, comma-separated rows that any tool can import.
Your XLSX file is ready in seconds. Open it and confirm the columns line up and numbers kept their type. Both the CSV you uploaded and the XLSX output are permanently deleted from our servers within 30 minutes.
Native spreadsheet formats (XLSX, XLS, ODS) store a workbook: multiple sheets, cell formatting, formulas, charts, and data types all live inside one file. CSV stores exactly one thing — a single grid of raw values as plain text. That difference decides what survives the trip.
Converting between two native formats preserves nearly everything. Converting to CSV deliberately flattens the workbook to its data: one sheet, no formulas (their results are kept, not the formulas themselves), no colours or merged cells. That's not a bug — it's exactly why CSV is the universal format for moving data between systems.
=SUM(A1:A9) exports as the computed number, not the formula. Keep the native CSV as your working copy if you still need to recalculate.Razones reales por las que las personas realizan esta conversión: basadas en problemas específicos, no en beneficios vagos.
Most databases, CRMs, and web apps accept XLSX as their import format but reject native workbooks. Converting your CSV to XLSX turns a spreadsheet into something a bulk-import tool can actually read, row by row.
A legacy XLS, an Apple Numbers export, or an ODS from LibreOffice doesn't always open cleanly everywhere. Converting to XLSX gets the data into a format the recipient's tool handles without formatting errors or "file corrupt" warnings.
Python, R, and command-line tools love plain, predictable input. Converting CSV to XLSX gives a script a clean grid to parse — no proprietary container to decode, no surprise sheets, just the values.
Native workbooks carry formatting, charts, and metadata that inflate size. If all you need is the data, converting CSV to XLSX can cut the file down dramatically — handy for email limits, uploads, or version control.
Accounting platforms, payroll systems, and analytics tools often publish an exact template format for uploads. If they require XLSX and your export is CSV, this conversion is the step between "ready" and "rejected."
When data arrives as a mix of XLS, XLSX, and ODS from different sources, analysis is a headache. Converting everything to a single XLSX format first means one consistent input — and you can batch the whole folder in one pass.
Every conversion happens on TLS-encrypted uploads, on isolated per-request workers, with both the source and the result auto-deleted within 30 minutes. No ads, no watermarks on paid tiers, no data mined for training.
Comparación técnica de los dos formatos: útil para decidir cuál usar o para confirmar qué cambia durante la conversión.
| Propiedad | CSV | XLSX |
|---|---|---|
| nombre completo | Valores separados por comas | Microsoft Excel (XML abierto) |
| Año de introducción | 1972 | 2007 |
| Desarrollador/cuerpo estándar | IBM (informal) | microsoft |
| tipo MIME | text/csv | aplicación/vnd.openxmlformats-officedocument.spreadsheetml.sheet |
| Extensión de archivo | .csv | .xlsx |
| Compresión | None | XML comprimido en ZIP |
| Color/profundidad de datos | N / A | N / A |
| Dimensiones máximas/tamaño | Unlimited | 1.048.576 filas × 16.384 columnas |
| Transparencia | No | No |
| Animación | No | No |
| Estándar / especificación | IETF RFC 4180 | ECMA-376/ISO/IEC 29500 |
| Lo mejor para | Data interchange, database imports, ETL pipelines | Hojas de cálculo modernas de Excel, análisis de datos. |
CSV (valores separados por comas) es un formato de texto sin formato que almacena datos tabulares con cada fila en una nueva línea y valores separados por comas. Sin embargo, CSV no tiene un organismo estándar formal RFC 4180 define convenciones comunes. Su simplicidad hace que CSV sea el formato de intercambio de datos más universalmente admitido: cada hoja de cálculo, base de datos, lenguaje de programación y herramienta de análisis puede leer y escribir archivos CSV.
Los archivos CSV contienen solo valores de datos sin formato, sin formato, fórmulas, gráficos ni metadatos. Esta simplicidad es tanto su fortaleza como su limitación: los archivos CSV son compactos, legibles por humanos en cualquier editor de texto y se importan sin problemas a bases de datos y procesos de procesamiento de datos. CSV es el formato estándar para exportaciones de datos, flujos de trabajo ETL, conjuntos de datos de aprendizaje automático, importaciones de CRM y movimiento de datos entre sistemas incompatibles.