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.CSVS file extension

To open .CSVS files on Windows, right-click the .csvs file → Open with → choose a text editor (for example, Notepad) to view and edit it as plain text.

To open a .csvs file, use a plain-text editor (for viewing/editing) or a CSV Schema-capable tool in your workflow. On most systems, .csvs is not meant for “opening” like a document—it is a schema file that other software reads to validate or interpret CSV files.

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Last updated: April 30, 2026 · Reviewed by Julian Stricker

Open on your device

Choose your operating system for a dedicated step-by-step opening guide.

How to open .CSVS files

Use these platform-specific instructions to open .CSVS files safely.

Windows

  1. Right-click the .csvs file → Open with → choose a text editor (for example, Notepad) to view and edit it as plain text.
  2. If you need to use it (not just view it), locate the related .csv file(s) and use your CSV-processing/validation workflow that supports CSV Schema.
Full Windows guide

Mac

  1. Control-click the .csvs file → Open With → choose a plain-text editor (for example, TextEdit in plain-text mode) to view or edit it.
  2. Keep the .csvs file with its corresponding .csv file(s) and use a CSV Schema-aware workflow/tool to apply the schema.
Full Mac guide

Linux

  1. Open the .csvs file in a text editor from your file manager (or use a command-line viewer/editor) since it is a text-based schema.
  2. If your desktop environment uses shared MIME-info, you may see it identified by a MIME mapping; regardless, treat it as a text schema and use it with CSV tools that support CSV Schema.
Full Linux guide

iOS

  1. Open the .csvs file in the Files app and use a text/code editor app to view it; if you only need to apply it, transfer the file to a desktop workflow that supports CSV Schema.
Full iOS guide

Android

  1. Open the .csvs file with a text editor app to view/edit it; for validation or schema application, move it to a desktop workflow that supports CSV Schema.
Full Android guide

Security notes

  • .csvs is a text-based schema format (not an executable format), but treat it as untrusted input for any automated processing: malformed schema content can still trigger bugs or denial-of-service issues in poorly written parsers.
  • Be cautious when a .csvs file is used in an automated pipeline to fetch or validate data; verify it came from a trusted source before using it to drive processing decisions.
  • Avoid “opening” .csvs in applications or plugins you do not trust; use a simple text editor if you only need to inspect its contents.

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Can't open this file?

These are the most common causes and fixes when .CSVS files fail to open.

Common reasons

  • The file opens as unreadable or in the wrong app
  • A tool treats it like a CSV data file
  • Validation fails or the schema does not match the CSV
  • MIME type confusion: text/csv vs text/csv-schema

Fix steps

  1. Open it with a plain-text editor rather than a spreadsheet program.
  2. If the system keeps choosing the wrong program, change the file association to a text editor for .csvs.

OS-specific troubleshooting

What is a .CSVS file?

A .csvs file is a CSV Schema Language document (version 1.2 spec) intended to describe the structure and rules for a CSV file. It is human-readable text and is commonly stored alongside the CSV it describes, so tools can validate data types, headers, and other constraints. The registered media type for CSV Schema is text/csv-schema (distinct from text/csv used for CSV data itself).

Background

CSV itself is widely standardized and documented (e.g., RFC 4180 registers the text/csv media type). A schema is often needed because CSV data alone usually does not carry strong typing (numbers vs. dates vs. text) or constraints (required fields, allowed values).

The CSV Schema Language provides a standard way to express that missing information as a separate schema file, and it explicitly suggests using the .csvs extension for those schema files. In practice, .csvs is most often used in data management, data validation, and digital preservation workflows where consistent interpretation of CSV datasets matters.

If you received a .csvs file, it is usually intended to accompany one or more .csv files. You typically edit it in a text editor and then run a validator/processor that understands CSV Schema to check or interpret the CSV data according to the schema.

Common MIME types: text/csv-schema

Further reading

Authoritative resources for more details on the .CSVS format.

Common .CSVS issues

The file opens as unreadable or in the wrong app

.csvs files are plain-text schemas; some systems may not have a default association and may prompt you to pick an app.

  1. Open it with a plain-text editor rather than a spreadsheet program.
  2. If the system keeps choosing the wrong program, change the file association to a text editor for .csvs.

A tool treats it like a CSV data file

Because the extension resembles .csv, some tools may mistakenly attempt to import it as comma-separated data instead of schema.

  1. Do not import .csvs into a spreadsheet as data; open it as text and confirm it is a schema file.
  2. Ensure you are using a workflow/tool that explicitly supports CSV Schema Language and that you are pointing it at the CSV data file plus the schema file.

Validation fails or the schema does not match the CSV

The schema may expect columns, headers, or types that do not match the actual CSV file (or the wrong CSV was paired with the schema).

  1. Confirm you are using the correct .csv file(s) that the schema was created for.
  2. Compare column names/order and expected types in the schema against the CSV content, then update the schema or the CSV accordingly.

MIME type confusion: text/csv vs text/csv-schema

CSV data and CSV Schema have different registered media types; using the wrong type can break automated pipelines.

  1. Use text/csv for actual CSV data files and text/csv-schema for .csvs schema files in systems that require explicit media types.
  2. If a platform only recognizes generic text types, document the intended meaning (.csvs schema) in your workflow and keep the file extension intact.

FAQ

Is .csvs the same as .csv?

No. A .csv file typically contains the data, while a .csvs file contains a schema (rules/structure) describing how to interpret or validate CSV data.

Can I rename .csvs to .csv to open it in Excel or a spreadsheet?

Renaming is not recommended. A .csvs file is not CSV data; changing the extension may cause software to misinterpret it. Open it in a text editor instead.

What MIME type should be used for .csvs files?

CSV Schema is registered with the media type text/csv-schema. (CSV data files use text/csv per RFC 4180.)

Why won’t my phone preview a .csvs file?

Many mobile viewers don’t recognize .csvs by default. Use a text editor app to view it, or transfer it to a desktop environment where you can edit and use it in a CSV Schema workflow.

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