The major modern representatives of Baltic-Finnic languages are Finnish and Estonian, the official languages of their respective nation states. The other Finnic languages in the Baltic Sea region are Ingrian, Karelian, Ludic, Veps, Votic, spoken around the Gulf of Finland and Lakes Onega and Ladoga. The Seto language and Võro are spoken in south-eastern Estonia and Livonian in parts of Latvia.
Meänkieli (in northern Sweden) and Kven (in northern Norway) are Finnish dialects that the Scandinavian countries of Sweden and Norway have given a legal status of independent languages. They are mutually intelligible with Finnish.
There is no grammatical gender in Baltic-Finnic languages, nor are there articles nor definite or indefinite forms.
The morphophonology (the way the grammatical function of a morpheme affects its production) is complex. One of the more important processes is the characteristic consonant gradation. Two kinds of gradation occur: the radical and suffix gradation, which affect the plosives /k/, /t/ and /p/. This is a lenition process, where the consonant is changed into a "weaker" form with some (but not all) oblique cases. For geminates, the process is simple to describe: they become simple stops, e.g. kuppia + -n → kupin (Finnish: "cup"). For simple consonants, the process complicates immensely and the results vary by the environment. For example, haka +-n → haan, kyky + -n → kyvyn, järki + -n → järjen (Finnish: "pasture", "skill", "intellect"). (See the separate article for more details.) Other important processes are vowel harmony (lost in Estonian), and the "erosion" of word-final sounds (strongest in Livonian, Võro and Estonian). This may leave a phonemic status to the morphophonological variations caused by the agglutination of the lost suffixes, which is the source of the third length level in these languages.
The original Uralic palatalization was lost in proto-Baltic-Finnic, but most of the diverging dialects reacquired it, probably under Slavic influence. Its secondary nature can be seen in that it is not an independent feature as in original Uralic, but dependent on the following vowel as in Slavic. Palatalization is a part of the Estonian literary language and is an essential feature in Võro, Veps, Karelian and other eastern Baltic-Finnic languages. It is also found in East Finnish dialects, and is only missing from West Finnish dialects and Standard Finnish.
A special characteristic of the languages is the large number of diphthongs. There are 16 diphthongs in Finnish and 25 in Estonian; at the same time the frequency is greater in Finnish than in Estonian.
There are 14 noun cases in Estonian and 15 in Finnish, which are denoted by adding a suffix.
Baltic-Finnic languages share some obviously noticeable features. The consonant sets are rather simple, and rich in alveolar consonants. There are two chronemes, which are phonemic: short, half-long geminate and over-long geminate consonants distinguish meanings and thus are different phonemes. The same goes with vowels; short, half-long and over-long vowels distinguish meanings. The meaning-distinguishing effect is the strongest in Estonian and Võro, where all three lengths are fully phonemic; other languages distinguish only two lengths, where half-long is an allophone of short. There is a large number of vocalic phonemes with strong contrasts between them and complex diphthong systems. For example, Estonian has nine monophthongs [aeiouyæøɤ] in three different lengths, and 26 diphthongs, each a distinct phoneme.
In grammar, Baltic-Finnic languages follow the pattern of Uralic languages.
With the Sami languages Baltic-Finnic languages share consonant gradation and the three-way consonant length contrast. Relative to Proto-Uralic, both have developed noninitial labial vowels and lost the labial glide preceding initial labial vowels. These features can be caused by a common ancestry (i.e. a distinct protolanguage giving rise to Proto-Baltic-Finnic and Proto-Sami), areal influence (Finnic peoples and Sami have coexistenced in the same areas), or coincidence.
The Urheimat of Baltic-Finnic speaking peoples is believed to be somewhere in the region of what is now Estonia, and consequently, the most central, integrated and oldest loans are from the Baltic languages, (proto-)Lithuanian and (proto-)Latvian. German and Russian are also the origin of some loans, added with other Germanic, such as Gothic or later Swedish, loans. There is little overt Russian influence in most languages, except in smaller languages, such as Karelian, which has a long history of close contact with Russian.