computer science

Open file format

Open file format is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Open file format rather than just read about it. In short: An open file format is a file format for storing digital data, defined by an openly published specification usually maintained by a standards organization, and which can be used and implemented by anyone. An open file format is licensed with an open license.

Key takeaways

Open file format belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Open file format to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Open file format from memory before moving on to harder problems.

Reference excerpt

An open file format is a file format for storing digital data, defined by an openly published specification usually maintained by a standards organization, and which can be used and implemented by anyone. An open file format is licensed with an open license. For example, an open format can be implemented by both proprietary and free and open-source software, using the typical software licenses used by each. In contrast to open file formats, closed file formats are considered trade secrets. Depending on the definition, the specification of an open format may require a fee to access or, very rarely, contain other restrictions. The range of meanings is similar to that of the term open standard.

Specific definitions

UK government In 2012 the UK Government created the policy Open Standards Principles, stating that the Open Standards Principles apply to every aspect of government IT and that Government technology must remain open to everyone. They have seven principles for selecting open standards for use in government, following these principals many open formats were adopted, notably Open Document Format (ODF). The seven principles for selecting open standards for use in the UK government are:

Open standards must meet user needs Open standards must give suppliers equal access to government contracts Open standards must support flexibility and change Open standards must support sustainable cost Select open standards using well-informed decisions Select open standards using fair and transparent processes Specify and implement open standards using fair and transparent processes

US government Within the framework of Open Government Initiative, the federal government of the United States adopted the Open Government Directive, according to which: "An open format is one that is platform independent, machine readable, and made available to the public without restrictions that would impede the re-use of that information".

State of Minnesota The State of Minnesota defines the criteria for open, XML-based file formats as follows:

The format is interoperable among diverse internal and external platforms and applications The format is fully published and available royalty-free The format is implemented by multiple vendors The format is controlled by an open industry organization with a well-defined inclusive process for evolution of the standard

Commonwealth of Massachusetts The Commonwealth of Massachusetts defines open formats as "specifications for data file formats that are based on an underlying open standard, developed by an open community, affirmed and maintained by a standards body and are fully documented and publicly available." The Enterprise Technical Reference Model (ETRM) classifies four formats as "Open Formats":

OASIS Open Document Format For Office Applications (OpenDocument) v. 1.1 Ecma-376 Office Open XML Formats (Open XML) Hypertext Document Format v. 4.01 Plain Text Format

Sun Microsystems Sun Microsystems defined the criteria for open formats as follows:

The format is based on an underlying open standard The format is developed through a publicly visible, community-driven process The format is affirmed and maintained by a vendor-independent standards organization The format is fully documented and publicly available The format does not contain proprietary extensions

The Linux Information Project According to The Linux Information Project, the term open format should refer to "any format that is published for anyone to read and study but which may or may not be encumbered by patents, copyrights or other restrictions on use" – as opposed to a free format which is not encumbered by any copyrights, patents, trademarks or other restrictions.

Examples of open formats

Open formats (in the royalty-free and free access sense) include:

PNG — a raster image format originally standardized by ISO/IEC and as an informational IETF RFC but from June 24, 2025 by W3C. FLAC — lossless audio codec WebM — a video/audio container format HTML — is the main markup language for creating web pages and other information that can be displayed in a web browser. gzip — for compression CSS — style sheet format usually used with (X)HTML, standardized by W3C ABC notation — Human readable musical notation for computers. The following formats are open (royalty-free with a one-time fee on the standard):

Office Open XML: the ECMA version is downloadable for no charge, but the newer ISO versions require a fee; OpenDocument: As adopted by the UK Government in 2012 to meet their open standards principles, for Government technology to remain open to everyone. C language: royalty-free, but ISO standard requires a fee (drafts available for no charge); PDF: an ISO-standardized file format for reliable document exchange across platforms;

Worked examples

Example 1 — a first encounter with Open file format

Start with the simplest possible case. Write down what Open file format claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Open file format before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Open file format ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Open file format

In research: Open file format appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Open file format in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Open file format is common in secondary-school and first-year university syllabi. It links to neighbouring topics Computer file formats, Open file formats, Open standards, so understanding it makes those chapters shorter.
In everyday life: Look for Open file format outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Open file format in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Open file format means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Open file format out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Open file format in simple terms?

Why does Open file format matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Open file format?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Open file format.