Common Voice Scripted Speech 25.0 - Czech

License:

CC0-1.0

Steward:

Common Voice

Task: ASR

Release Date: 3/23/2026

Format: MP3

Size: 5.56 GB

Description

A collection of read speech recordings in Czech (Čeština).

Specifics

Licensing

Creative Commons Zero v1.0 Universal (CC0-1.0)

https://spdx.org/licenses/CC0-1.0.html

Considerations

Restrictions/Special Constraints

None provided.

Forbidden Usage

It is forbidden to attempt to determine the identity of speakers in the Common Voice datasets. It is forbidden to re-host or re-share this dataset.

Processes

Intended Use

This dataset is intended to be used for training and evaluating automatic speech recognition (ASR) models. It may also be used for applications relating to computer-aided language learning (CALL) and language or heritage revitalisation.

Metadata

Čeština — Czech (`cs`)

This datasheet is for cv-corpus-25.0-2026-03-09 of the Mozilla Common Voice Scripted Speech dataset for Czech [Čeština - cs]. The dataset contains 216875 clips representing 268.7 hours of recorded speech (81.09 hours validated) from 1134 speakers, recorded from a text corpus of 451,358 sentences.

Language

Accents

Code	Accent	Clips	Speakers
-		24,609 (11.3%)	155 (13.7%)

Demographic information

The dataset includes the following self-declared age and gender distributions. A coverage summary is shown below each table.

Gender

Self-declared gender information. The table shows clip and speaker counts with percentages. Speakers who did not declare a gender are listed as Unspecified. A dash (-) indicates zero.

Code	Gender	Clips	Speakers
male_masculine	Male, masculine	115,868 (53.4%)	385 (34.0%)
female_feminine	Female, feminine	47,471 (21.9%)	50 (4.4%)
transgender	Transgender	-	-
non-binary	Non-binary	-	-
do_not_wish_to_say	Prefer not to say	-	-
-	Unspecified	53,536 (24.7%)	811 (71.5%)

Gender declared: 163,339 of 216,875 clips (75.3%), 323 of 1,134 speakers (28.5%)

Age

Self-declared age information. The table shows clip and speaker counts with percentages. Speakers who did not declare an age are listed as Unspecified. A dash (-) indicates zero.

Code	Age	Clips	Speakers
teens	Teens	5,328 (2.5%)	47 (4.1%)
twenties	Twenties	40,351 (18.6%)	157 (13.8%)
thirties	Thirties	101,274 (46.7%)	154 (13.6%)
fourties	Fourties	15,289 (7.0%)	75 (6.6%)
fifties	Fifties	2,675 (1.2%)	23 (2.0%)
sixties	Sixties	314 (0.1%)	5 (0.4%)
seventies	Seventies	20 (0.0%)	1 (0.1%)
eighties	Eighties	-	-
nineties	Nineties	-	-
-	Unspecified	51,624 (23.8%)	798 (70.4%)

Age declared: 165,251 of 216,875 clips (76.2%), 336 of 1,134 speakers (29.6%)

Data splits for modelling

Clip buckets

Bucket	Clips
Validated	65,452 (30.2%)
Invalidated	2,665 (1.2%)
Other	148,758 (68.6%)

Training splits

Split	Clips
Train	22,269 (34.0%)
Dev	9,473 (14.5%)
Test	9,463 (14.5%)

Training split coverage: 41,205 of 65,452 validated clips (63.0%)

The dataset contains 65452 validated, 2665 invalidated, and 148758 unresolved clips. The average clip duration is 4.46 seconds.

Text corpus

Validated sentences: 451,253

Category	Count
Unvalidated sentences	105
Pending sentences	82
Rejected sentences	23
Reported sentences	966

The corpus contains 451,358 sentences: 451,253 validated and 105 unvalidated (82 pending review, 23 rejected), with 966 reported for review.

Sample

There follows a randomly selected sample of five sentences from the corpus.

Zde byl vyhlášen nejlepším brankářem ligy.
Viděla tři postavy na blízkém kopci na koni s bajonetem.
Dopravní spojení s centrem města a ostatními městskými částmi zajišťuje Dopravní podnik města Košice.
Měli dva páry ploutví a živili se rybami a hlavonožci.
Závěr filmu je zcela odlišný od knižní předlohy.

Sources

Source	Sentences
wiki	342,013 (75.8%)
europarl-v7-cs	98,821 (21.9%)
sentence-collector	9,834 (2.2%)
Other	585 (0.1%)

Text domains

Code	Domain	Clips	Speakers
general	General	15 (0.0%)	10 (0.9%)
agriculture_food	Agriculture and Food	-	-
automotive_transport	Automotive and Transport	1 (0.0%)	1 (0.1%)
finance	Finance	-	-
service_retail	Service and Retail	-	-
healthcare	Healthcare	-	-
history_law_government	History, Law and Government	1 (0.0%)	1 (0.1%)
media_entertainment	Media and Entertainment	4 (0.0%)	4 (0.4%)
nature_environment	Nature and Environment	-	-
news_current_affairs	News and Current Affairs	-	-
technology_robotics	Technology and Robotics	8 (0.0%)	7 (0.6%)
language_fundamentals	Language Fundamentals	-	-

Fields

Clips

Each row of a tsv file represents a single audio clip, and contains the following information:

client_id - hashed UUID of a given user
path - relative path of the audio file
text - supposed transcription of the audio
up_votes - number of people who said audio matches the text
down_votes - number of people who said audio does not match text
age - age of the speaker1
gender - gender of the speaker1
accents - accents of the speaker1
variant - variant of the language1
segment - if sentence belongs to a custom dataset segment, it will be listed here
prompt_upvotes - number of upvotes the sentence prompt received
prompt_reports - number of reports the sentence prompt received
is_edited - whether the clip's transcription has been edited

`validated_sentences.tsv`

The validated_sentences.tsv file contains one row per validated sentence in the text corpus:

sentence_id - unique identifier for the sentence
sentence - the sentence text
variant - the variant of the language
sentence_domain - the domain(s) the sentence belongs to
source - the source the sentence was collected from
is_used - whether the sentence is still in circulation for recording
clips_count - number of clips recorded for this sentence

`unvalidated_sentences.tsv`

The unvalidated_sentences.tsv file contains one row per unvalidated sentence in the text corpus:

sentence_id - unique identifier for the sentence
sentence - the sentence text
variant - the variant of the language
sentence_domain - the domain(s) the sentence belongs to
source - the source the sentence was collected from
up_votes - number of upvotes the sentence received
down_votes - number of downvotes the sentence received
status - current status of the sentence (pending or rejected)

Get involved

Community links

Discussions

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Licence

This dataset is released under the Creative Commons Zero (CC-0) licence. By downloading this data you agree to not determine the identity of speakers in the dataset.

Footnotes

For a full list of age, gender, and accent options, see the demographics spec. These will only be reported if the speaker opted in to provide that information. ↩ ↩2 ↩3 ↩4