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.TSD·File Extension

TSD Data & Text — A .tsd file is a TSD Data & Text. It is a text-based data format widely used for configuration files, data interchange and API payloads.

Data & Textapplication/timestamped-data

Quick facts

Extension.tsd

File typeTSD Data & Text

MIME typeapplication/timestamped-data

CategoryData & Text

Charset—

Compressible—

What is .tsd

What is a .tsd file?

A .tsd file is a TSD Data & Text. It is a text-based data format widely used for configuration files, data interchange and API payloads.

In the mime-db registry it maps to application/timestamped-data. When serving .tsd over HTTP, set the Content-Type header as shown in Developer info below.

Related entities: it maps to application/timestamped-data — and is delivered over HTTP via the Content-Type header.

How to open .tsd files

Use VS Code or Notepad++ to open and edit .tsd files.
Any text editor (Notepad, VS Code) can inspect the raw content as text.

Developer info

When served over HTTP, responses should set the following header:

Content-Type: application/timestamped-data

Common software that reads/writes .tsd:

VS CodeNotepad++Sublime Textjq

Relation chain

.tsdextension of

format

TSD Data & Textserved as

mime type

application/timestamped-datasent via header

http header

Related extensions

Related MIME types

application/timestamped-data

.tsd

Common uses

Configuration files
Data interchange between systems
API request and response payloads
Logs and data exports

How to edit .tsd files

Open the file with VS Code, make your changes and save.
Most editors preserve the original formatting and encoding — avoid changing the charset.

How to create .tsd files

Create a new file and save it with the .tsd extension, or export this format from VS Code.

Frequently asked questions

What programs can open .tsd files?

Common options include VS Code, Notepad++, Sublime Text. You can also open many of these files with built-in viewers or a browser.

How do I create a .tsd file?

Create a new file in any text editor or the app that owns the format and save it with the .tsd extension.

What is the relationship between .tsd and the application/timestamped-data MIME type?

application/timestamped-data is the media type identifier used for .tsd files during network transfer (for example in the HTTP Content-Type header).

Sources & standards

Updated 2026-09-13

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