Free online XLS-to-XLSX converter — upload a XLS file and download a XLSX. Fast, private, no signup.
Drop your XLS file into the converter above — we auto-detect the real format from its bytes, convert it, and give you a XLSX to download. No software to install.
Yes. Convert XLS to XLSX for free right in your browser, with no account needed to get started.
Your file is transferred over an encrypted connection and anonymous uploads are temporary. You can also view and strip metadata (location, device, author) before you download.
Legacy binary Excel spreadsheet. Office Open XML spreadsheet (Excel).
Convert XLS to: CSV · ODS · TSV · PDF · JSON · HTML · YAML · PARQUET · AVRO · NDJSON
Convert to XLSX from: AVRO · JSON · NDJSON · ORC · PARQUET · XML · YAML · PDF · CSV · ODS