How to Build a Conlang

Language construction — or conlanging — is the deliberate, principled design of a language from the ground up. The result is called a conlang (constructed language). Unlike random word generators or simple substitution ciphers, a true conlang has an internally consistent rule system: a phoneme inventory, a grammar, a vocabulary, and a logic for how meaning works.

The tradition is older than the internet. Tolkien began work on his Elvish languages in the 1910s, long before conlanging had a name. What makes his work remarkable is not that he invented words, but that he built a system — a Proto-Elvish root language that evolved, over fictional millennia, into Quenya and Sindarin, each with its own sound changes, morphological rules, and literary register. The same principled approach was later used by Marc Okrand (Klingon, 1984) and David J. Peterson (Dothraki and High Valyrian, 2009–2019), both professional linguists hired specifically to give fictional cultures authentic, learnable tongues.

What separates a conlang from a word list is the same thing that separates a language from a codebook: generativity. A generative language can produce new sentences it has never seen before. A word list cannot. Building a generative conlang requires all five linguistic layers working together — which is exactly what this guide covers.

For a broader introduction to what conlangs are and why people build them, see our full guide: What Is a Conlang?

Every conlang is shaped by its purpose. The three major categories are:

Your purpose shapes every downstream decision. An artlang for a D&D campaign needs phonological character first — the sounds should feel like the culture. An auxlang needs a minimal, regular morphology so learners aren't buried in conjugations. A loglang may sacrifice phonological beauty entirely for logical clarity. Before you choose consonants, decide what your language is for.

Context matters too. Fiction and game conlangs benefit from small, memorable phoneme inventories — players need to be able to say the words at the table. Screen conlangs need actors to be able to learn them under time pressure. Personal or community conlangs can afford more complexity, because their speakers are invested.

Phonology is the study and design of a language's sound system. It covers three questions: which sounds (phonemes) exist in the language, how those sounds combine into syllables, and what patterns make the language sound the way it does.

A phoneme is the smallest unit of sound that distinguishes meaning — the difference between "bat" and "cat" is one phoneme change. Natural languages use between ~11 and ~140 phonemes; most fall in the 20–40 range. For a conlang, choosing ~15–30 phonemes gives enough variety to feel like a real language without overwhelming speakers.

Syllable structure is described with C (consonant) and V (vowel) templates. Japanese is nearly entirely CV — every syllable is a consonant followed by a vowel, which is why Japanese sounds flowing and open. Klingon allows complex CVC and even CCVC clusters — harsh consonant pileups that make it sound aggressive and alien. Elvish (Sindarin) favors CVC and CV with liquid consonants (l, r) and open vowels (a, e, i) — flowing and musical.

Some phonological choices that define well-known conlangs:

• Quenya (Tolkien): Rich in nasal consonants (m, n, ñ) + open vowels (a, e, o, i, u with long variants). No voiced stops (b, d, g) in classical form — gives an ethereal, legato quality.
• Sindarin (Tolkien): Welsh-inspired consonant mutations — the initial consonant of a word changes based on grammar. Fricatives (th, ch, f) dominate over stops. Sounds rugged but melodic.
• Klingon (Okrand): Ejective consonants (q, Q, tlh) and back-of-throat sounds (H, gh) rare in natural languages. Intentionally maximally uncomfortable for English speakers.
• Dothraki (Peterson): Central-Asian steppe phonology: retroflex consonants, /kh/ aspirate, guttural /q/. Sounds like a language evolved for shouting across open plains.

CraftLingua's phonology step lets you choose from four phonological profiles — naturalistic (human-comfortable consonant and vowel inventory), alien (unusual consonant clusters and exotic phonemes), and harmonic (vowel-harmony system where vowels in a word agree in backness or rounding), and industrial (mechanical buzz and grind — retroflex, trilled and voiced fricative sounds with short, heavy syllables). Each profile generates a distinct sonic character with a single setting. Try it free in CraftLingua →

Morphology is the rule system for how a language builds words from smaller meaningful units called morphemes. A morpheme is the smallest unit of meaning — "un-", "run", and "-able" are each morphemes in "unrunnable". Morphological typology is one of the most consequential choices in conlang design: it determines how complex your grammar will be and how difficult your language is to learn and speak.

The three major morphological types are:

Most real languages blend types — English is predominantly isolating but has fusional remnants ("ran" packs PAST + SINGULAR into one irregular form). Your conlang can blend types too, but choosing a dominant type keeps the grammar learnable.

For fiction and games, agglutinative languages are often the most satisfying: you can show players "run-PAST-SINGULAR → 'I ran'" as a transparent rule, which makes the language feel real without requiring them to memorize paradigm tables. Fusional languages produce more naturalistic-sounding words but require more grammar study. Isolating conlangs are easiest to learn but can sound thin.

The lexicon is the vocabulary of your conlang — but building a lexicon is not just translating a word list. It's deciding what cultural and conceptual territory your language is designed to cover, and then populating that territory with words derived consistently from your phonological and morphological system.

Vocabulary domains reveal culture. A people who live close to the land might have a rich Nature lexicon: dozens of distinct terms for types of rain, soil composition, wind direction, and forest density — distinctions that English collapses into a handful of words. A seafaring culture might have a Maritime lexicon with fine-grained terms for weather states, wave types, and navigation conditions. A warrior culture might have a Conflict domain with separate words for honourable combat, ambush, siege, and ritual duel.

The key principle is consistency. A word in your lexicon should be derivable from your phonological rules (it only uses allowed phonemes and syllable shapes) and your morphological rules (compound words and derived forms follow the same affix patterns). This is how Tolkien built Quenya: from a set of ~500 root morphemes (like mel- "love", cal- "light", elen- "star"), all compounds and derivations followed transparently from those roots.

CraftLingua derives vocabulary algorithmically from your lexical domain settings rather than loading a fixed dictionary. This means the translation engine can handle any English phrase — not just pre-loaded words — because it generates new vocabulary on demand using the same rules as the rest of the language.

Semantics is the study of meaning — how words and sentences carry and convey information. In conlang design, the semantic dimension is often the most philosophically interesting: you get to decide how your language carves up reality, and how literal or figurative that carving is.

There are three broad semantic orientations a conlang can take:

One of the richest examples of deliberate semantics is Tolkien's root-word system. The root mel- encodes "love" — but by combining it with different derivational affixes it produces mellon (friend, literally "one who loves"), mellyrn (mallorn trees, literally "love-trees", named for how the Elves cherished them), and Melkor (originally "He who arises in might", but semantically inverted by his fall). Every word carries secondary meaning that rewards readers who learn the root system.

For a fiction conlang, the most powerful semantic choice is deciding what abstractions your culture privileges. A culture that lacks a word for "ownership" but has six words for "stewardship" reveals something profound about its values — and that revelation can emerge from systematic semantic design rather than arbitrary vocabulary choices.

Pragmatics is the study of how context shapes language use — specifically the social rules that govern who says what to whom, and how. It is the layer that most often gets skipped in conlang design, but it is what makes a conlang feel culturally alive rather than just a translation cipher.

The core pragmatic dimension is register — the variation in language depending on social context. Most natural languages have at least a formal and informal register: Japanese has five levels of politeness encoded directly in verb conjugation. Korean marks social hierarchy in every sentence through speech levels. Even English makes pragmatic distinctions: "I require your assistance" versus "Can you help?" versus "Hey, help me out" are the same semantic content at three different registers.

For a conlang, pragmatic design decisions include:

• Formal vs informal register: Does the language have separate vocabulary or verb forms for respectful and casual speech? High Valyrian has an elaborate honorific system; Dothraki has almost none — social hierarchy in Dothraki culture is performed through action, not language.
• Inclusive vs exclusive 'we': Many languages distinguish between 'we-including-you' and 'we-not-including-you'. This is culturally telling — a language with this distinction encodes whether the listener is inside or outside the speaker's group at the grammatical level.
• Speech register for different contexts: A D&D orcish conlang might have emphatic speech only — loud, direct, no hedging — with a complete absence of formal register. This isn't a limitation but a design choice that reflects orcish culture's directness.
• Taboo and euphemism systems: What can't be said directly? Every culture has linguistic taboos. A conlang with a developed euphemism system for certain domains (death, the sacred, the enemy) feels richer and more plausible.

Pragmatics is the last step because it depends on all the others: you need a phonology to pronounce the register distinctions, a morphology to encode them, a lexicon to express the social domains, and a semantic system to understand what "respectful meaning" even looks like in your language's conceptual framework.

A conlang is only as useful as its ability to carry meaning. An arbitrary list of translated words is not a language — it's a glossary. A real conlang must be translatable: given any input phrase, the language system should produce a unique, consistent, reproducible output — not a random selection from a word list.

This requires what linguists call deterministic derivation. Given the same phonological system, the same morphological rules, and the same lexical domain, the same English phrase should always produce the same conlang output. This is what makes a conlang learnable: speakers can internalize the rules and predict outputs, rather than memorizing each translation individually.

In practice, building a deterministic translation engine is the hardest part of conlang design — which is why most amateur conlangs stall at the word list phase. CraftLingua solves this with a real-time translation panel that applies your phonological, morphological, and lexical settings to any English input, producing consistent conlang output on every keystroke. The same settings always produce the same word — not random variation.

The share code system encodes your complete language settings (not just a word list) in a URL-safe string. Anyone who loads your share code gets the same deterministic translation engine — they can translate any phrase and get the same result you would. This is the difference between sharing a conlang and sharing a cipher.

Once your conlang is designed and translating, CraftLingua offers several export and sharing paths: