What does encoding mean?
Encoding is the process of converting information from one form into a coded representation so that it can be stored, transmitted, or processed reliably. In computing, an encoding defines how characters, numbers, images, or audio are mapped onto binary data; familiar standards such as ASCII and UTF-8 determine which symbols a text file contains and how they appear across devices. The term extends beyond technology: in telecommunications, encoding prepares signals for transmission over a channel, while in psychology it describes how the brain transforms sensory experience into memory. Encoding carries no connotation of secrecy — that role belongs to encryption — because encoded data can be reversed by anyone who knows the scheme. Understanding encoding matters because mismatches between formats are a common source of garbled text, corrupted files, and failed communication between systems.
The process of converting information into a coded form, or the particular format or scheme used for such conversion.
"Modern video encoding allows high-definition films to be streamed efficiently over the internet."
Often preceded by a modifier naming the medium or standard, as in 'character encoding' or 'audio encoding'.
Present participle of 'encode': converting information into a coded form.
"The software is currently encoding the raw footage into a compressed format."
Functions both as part of continuous verb forms ('is encoding') and as a gerund ('Encoding takes CPU time').
Used when referring to multiple distinct schemes or instances of conversion, especially in technical writing about different character sets or data formats.
"The library supports several encodings, including UTF-8 and ISO-8859-1."
Every emoji you've ever sent exists only because someone agreed on a character encoding — without UTF-8, your messages would be unreadable gibberish.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of encoding
'Encoding' derives from the verb 'encode', formed in English from the prefix 'en-' (from Old French/Latin, meaning 'to put into') combined with 'code'. 'Code' itself traces back through French to Latin 'codex', originally meaning a trunk or tree stump and later a bound book of laws, before acquiring its modern sense of a systematic set of signs. Cognate words sharing this Latin root include 'codex', 'codicil', and 'codify'. The compound 'encode' became prominent in the twentieth century with the rise of computing and information theory.
Related word forms
How encoding is actually used
Primarily a technical term used in computing, telecommunications, linguistics, and psychology; in everyday speech 'encoding' usually refers to digital data formats, while in cognitive science it describes how information enters memory. It is neutral in register but most natural in formal or specialist contexts.
Easily confused with encoding
Encryption deliberately conceals information to keep it secret, whereas encoding converts information into a standard format for compatibility or transmission without any intent of secrecy.