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Ich-Laut and ach-Laut
The term ich-Laut refers to the voiceless palatal fricative (which is found in the word ich  'I'), the term ach-Laut to the voiceless velar fricative  (which is found in the word ach [ax] the interjection 'oh/alas'). Note that Laut [la͡ʊt] is the German word for 'phoneme'. In German, these two sounds are allophones occurring in complementary distribution. The allophone occurs after back vowels and  (for instance in Buch  'book'), the allophone  after front vowels (for instance in mich  'me/myself') and consonants (for instance in Furcht  'fear').

In loanwords, pronunciation of potential fricatives in onsets of stressed syllables vary: in the Northern varieties of standard German, it is, while in Southern varieties, it is , and in Western varieties, it is (for instance in China:  vs.  vs. ).

The diminutive suffix -chen is always pronounced with an ich-Laut. Usually, this ending triggers umlaut (compare for instance Hund 'dog' to Hündchen 'little dog'), so theoretically, it could only occur after front vowels. However, in some comparatively recent coinings, there is no longer an umlaut, for instance in the word Frauchen 'mistress (of a dog)' (a diminutive of Frau 'woman'), so that a back vowel is followed by, even though normally it would be followed by a , as in rauchen  'to smoke'. This exception to the allophonic distribution is considered by some to be an effect of the morphemic boundary. However, many phoneticians believe that this is an example of phonemicization, where erstwhile allophones undergo a split into separate phonemes.

The allophonic distribution of after front vowels and  after other vowels is also found in other languages, such as Scots, in the pronunciation of light. However, it is by no means inevitable: Dutch, Yiddish, and many Southern German dialects retain in all positions. It is thus reasonable to assume that Old High German ih, the ancestor of modern ich, was pronounced with rather than. And while it is impossible to know for certain whether Old English words such as niht (modern night) were pronounced with or,  is likely (see Old English phonology).

Despite the phonetic history, the complementary distribution of and  in modern Standard German is better described as backing of  after a back vowel, rather than fronting of  after a front vowel, because  is used in onsets (Chemie  'chemistry') and after consonants (Molch  'newt'), and is thus the underlying form of the phoneme. This is an example of assimilation.

According to Kohler, the German ach-Laut is further differentiated into two allophones, and :  occurs after  (for instance in Buch  'book') and  after  (for instance in Bach  'brook'), while either  or  may occur after, with  predominating.

Fortis-lenis pairs
Various German consonants occur in pairs at the same place of articulation and in the same manner of articulation, namely the pairs , , , ,. These pairs are often called fortis-lenis pairs, since describing them as voiced/voiceless pairs is inadequate. With certain qualifications, are also considered fortis-lenis pairs.

The fortis plosives are aspirated in most varieties (exceptions include Bavarian-Austrian varieties). The aspiration is strongest in the onset of a stressed syllable(such as Taler 'thaler'), weaker in the onset of an unstressed syllable(such as Vater  'father'), and weakest in the syllable coda (such as in Saat  'seed').

The lenis consonants are Voicelessin most southern varieties of German. For clarity, they are often transcribed as. The nature of the phonetic difference between the voiceless lenis consonants and the similarly voiceless fortis consonants is controversial. It is generally described as a difference in articulatory force, and occasionally as a difference in articulatory length; for the most part, it is assumed that one of these characteristics implies the other.

In most varieties of German, the opposition between fortis and lenis is neutralized in the syllable coda ,due to terminal devoicing (Auslautverhärtung). A few southern varieties of German, such as Swiss German, present an exception to this.

In various central and southern varieties, the opposition between fortis and lenis is also neutralized in the syllable onset ; sometimes just in the onset of stressed syllables, sometimes in all cases.

The pair is not considered a fortis-lenis pair, but a simple voiceless-voiced pair, as  remains voiced in all varieties, including the Southern varieties that devoice the lenes. Generally, the southern is realized as the voiced approximant. However there are southern varieties which differentiate between a fortis (such as in sträflich  'culpable' from Middle High German stræflich) and a lenis  (, such as in höflich  'polite' from Middle High German hovelîch); this is analogous to the opposition of fortis   and lenis.

Stress
Stress in German usually falls on the first syllable, with the following exceptions: Moreover, German makes a distinction in stress between separable prefixes (stress on prefix) and inseparable prefixes (stress on root) in verbs and words derived from such verbs. Therefore:
 * Many loanwords, especially proper names, keep their original stress.
 * Verbs of the "-ieren" group (e.g. studieren 'to study', kapitulieren 'to surrender', stolzieren 'to strut') receive stress on their penultimate (second to last) syllable.
 * Compound adverbs, with her, hin, da, or wo as their first syllable part, receive stress on their second syllable.
 * Words beginning with be-, ge-, er-, ver-, zer-, ent-, emp- and a few others receive stress on the second syllable.
 * Words beginning with ab-, auf-, ein-, vor-, and most other prepositional adverbs receive stress on their first syllable.
 * Some prefixes, notably über-, unter-, and um-, can function as separable or inseparable prefixes, and are stressed and unstressed accordingly.
 * Rarely, two homographs with such prefixes are formed. They are not strictly homophones.  Consider the word, umschreiben.  As um•schreiben (separable prefix), it means 'to rewrite', and is pronounced, and its associated noun, die Umschreibung also receives stress on the first syllable.  On the other hand, umschreiben (inseparable prefix) is pronounced .  This word means 'to circumscribe', and its associated noun, die Umschreibung ('circumscription') also receives stress on the second syllable. Another example is the word umfahren. With stress on the root  it means 'to drive around (an obstacle in the street)', and with stress on the prefix  it means 'to drive over' or 'to collide with (an object on the street).'

General
German infants go through a babbling stage in the early phases of phonological acquisition, during which they produce the sounds they will later use in their first words. Phoneme inventories begin with plosives, nasals, and vowels; (contrasting) short vowels and liquids appear next, followed by fricatives and affricates, and finally all other consonants and consonant clusters. Children begin to produce protowords near the end of their first year. These words do not approximate adult forms, yet have a specific and consistent meaning. Early word productions are phonetically simple and usually follow the syllable structure CV or CVC, although this generalization has been challenged. The first vowels produced are /ə/, /a/, and /ɑ/, followed by /e/, /i/, and /ɛ/, with rounded vowels emerging last. German children often use phonological processes to simplify their early word production. For example, they may delete an unstressed syllable (Schokolade [ˌʃakəˈlaːdə] ‘chocolate’ pronounced [ˈlaːdə]), or replace a fricative with a corresponding stop (Dach [dax] ‘roof’ pronounced [dak]). One case study found that a 17-month-old child acquiring German replaced the voiceless velar fricative [x] with the nearest available continuant [h], or deleted it altogether (Buch [buːx] ‘book’ pronounced [buh] or [buː]).

Vowel Space Development
In 2009, Lintfert examined the development of vowel space of German speakers in their first three years of life. During the babbling stage, vowel distribution has no clear pattern. However, stressed and unstressed vowels already show different distributions in the vowel space. Once word production begins, stressed vowels expand in the vowel space, while the F1-F2 vowel space of unstressed vowels becomes more centralized. The majority of infants are then capable of stable production of F1. It should be noted that the variability of formant frequencies among individuals decreases with age. After 24 months, infants expand their vowel space individually at different rates. However, if the parents’ utterances possess a well-defined vowel space, their children produce clearly distinguished vowel classes earlier. By about three years old, children command the production of all vowels, and they attempt to produce the four cardinal vowels, /y/, /i/, /u/ and /a/, at the extreme limits of the F1-F2 vowel space (i.e., the height and backness of the vowels are made extreme by the infants).

Grammatical Words
Generally, closed-class grammatical words (e.g. articles and prepositions) are absent from children’s speech when they first begin to combine words. However, children as young as 18 months old show knowledge of these closed-class words when they prefer stories with them, compared to passages with them omitted. Therefore, the absence of these grammatical words cannot be due to perceptual problems. Researchers tested children’s comprehension of four grammatical words: bis [bɪs] ‘up to’, von [fɔn] ‘from’, das [das]‘the’, and sein [za͡ɪn] ‘his’. After first being familiarized with the words, eight-month-old children looked longer in the direction of a speaker playing a text passage that contained these previously heard words. However, this ability is absent in six-month-olds.

Nasals
The acquisition of nasals in German differs from that of Dutch, a phonologically closely related language. German children produce proportionately more nasals in onset position (sounds before a vowel in a syllable) than Dutch children do. German children, once they reached 16 months old, also produced significantly more nasals in syllables containing schwas, when compared with Dutch-speaking children. This may reflect differences in the languages the children are being exposed to, although the researchers claim that the development of nasals likely cannot be seen apart from the more general phonological system the child is developing.

Phonotactic Constraints and Reading
A 2006 study examined the acquisition of German in phonologically delayed children (specifically, issues with fronting of velars and stopping of fricatives) and whether they applied phonotactic constraints to word-initial consonant clusters containing these modified consonants. In many cases, the subjects (mean age = 5;1) avoided making phonotactic violations, opting instead for other consonants or clusters in their speech. This suggests that phonotactic constraints do apply to the speech of German children with phonological delay, at least in the case of word-initial consonant clusters. Additional research has also shown that spelling consistencies seen in German raise children’s phonemic awareness as they acquire reading skills.

Sound changes and mergers
A merger found mostly in Northern accents of German is that of (spelled ä, äh) with  (spelled e, ee, or eh). Some speakers merge the two everywhere, some distinguish them everywhere, others keep distinct only in conditional forms of strong verbs (for example they distinguish ich gäbe 'I would give' vs. ich gebe 'I give', but not Bären 'bears' vs. Beeren 'berries').

Another common merger is that of at the end of a syllable with  or respectively, for instance Krieg  'war', but Kriege  'wars'. This pronunciation is frequent all over Central and Northern Germany. At least in Northern Germany this can be considered a substrate of Low German, where the G was a [Fricative consonant|fricative]], becomine voiceless in the syllable coda, as it is common in Dutch, Low German and German. Only in one case, in the grammatical ending -ig (which corresponds to English -y), this pronunciation is prescribed by the Siebs standard, for instance wichtig 'important'. The merger occurs neither in Austro-Bavarian and Alemannic German nor in the corresponding varieties of Standard German.

Many speakers do not distinguish the affricate pf from the simple fricative f in the beginning of a word. The verb (er) fährt '(he) travels' and the noun Pferd 'horse' are then equally pronounced. This occurs especially in regions where pf does not originally occur in the local dialects, i.e. Northern and Western Germany. Some speakers even avoid pf in the middle or ending of a word, replacing it by a both labialized and aspirated version of [p], whereby Tropfen 'drop' sounds like

In everyday speech, also of educated people, many more mergers occur, some of which are universal and some of which are typical for certain regions or dialect backgrounds. Overall, there is a strong tendency to reduction and contraction. For example, long vowels may be shortened, consonant clusters may be simplified, short e in the ending of a word may be dropped in some positions, and the suffix -en may be contracted with preceding consonants, e.g. for haben  'to have'.

Middle High German
The Middle High German vowels and  developed into the modern Standard German diphthong, and  and  developed into. For example, Middle High German heiz and wîz ('hot' and 'white') became Standard German heiß and weiß. In other dialects, the Middle High German vowels developed differently: Bavarian hoaß and weiß, Ripuarian heeß and wieß, Swiss German heiss and wiiss, Yiddish "heys" and "vays".

The Middle High German diphthongs and  became the modern Standard German long vowels  and  after the Middle High German long vowels changed to diphthongs. In most Upper German dialects, the diphthongs are retained. A remnant of their former diphthong character is shown when continues to be written ie in German (as in Liebe 'love').