The plain-text spreadsheet format every data tool can read — and the common language Filemorph uses to move data between JSON, Excel, and PDF.
CSV (Comma-Separated Values) stores tabular data as plain text, with each line representing a row and commas separating the columns, which makes it about as simple as a spreadsheet format can get. That simplicity is precisely why CSV has outlasted more sophisticated alternatives as the universal exchange format for tabular data: every spreadsheet program, database, and data-analysis tool can read and write it, since there is no proprietary structure to reverse-engineer the way there is with a native Excel or Numbers file. A bank's transaction export, a contact list, a scientific dataset, and a mailing list all commonly leave their source system as CSV specifically so the receiving software does not need to match the sender's exact program. The tradeoff is that CSV carries none of a real spreadsheet's formatting, formulas, or multiple sheets — it is data and nothing else — which is why it usually needs converting into Excel for actual spreadsheet work, or into JSON for a developer's script, once the raw export needs to become something more structured.
iPhone, iPad, and Mac open CSV files in Numbers, Excel, and the Files app preview. Every spreadsheet program, database tool, and programming language on any platform reads CSV, since it has no proprietary structure that needs decoding.
CSV is the safest export format precisely because it carries no formatting or formulas, but that also means it needs converting into Excel or JSON before it's genuinely usable in most workflows. Filemorph handles that conversion on-device instead of through a spreadsheet-import website.
Filemorph can convert CSV to XLSX on-device — a real spreadsheet with columns, sorting, and formulas instead of plain comma-separated text.
Filemorph converts .csv files entirely on-device on iPhone, iPad and Mac — no upload, no account, and it works in Airplane Mode.
Relevant operations in Filemorph:
CSV is plain text with no proprietary structure, so any spreadsheet program, database, or script can read it without matching the exporting software's exact format. Excel's native XLSX format is more capable but far less universally readable by other systems.
Yes. Filemorph converts CSV directly into an Excel (XLSX) spreadsheet on the iPhone, and can also turn it into JSON for a script, or a formatted table in PDF or HTML.
Yes. Filemorph converts CSV files entirely on-device, so financial exports or contact lists are never uploaded to a server, and the conversion works the same with no internet connection.