Websites To Download Free Datasets

1.Kaggle

Kaggle medical image datasets are collections of medical images that have been organized and annotated for use in machine learning and deep learning applications. The datasets typically contain a large number of images, often in the tens of thousands, and are organized into categories or classes. The images in the datasets can be of any type, including X-rays, MRI scans, and CT scans.

2. NIH Image Gallery

The NIH medical image datasets are a collection of medical images that have been collected and made available by the National Institutes of Health (NIH). The images in the dataset can be used to train and test algorithms for various medical image analysis tasks.

3.ImageNet

ImageNet is a large-scale medical image dataset that contains more than 1 million images of various diseases and conditions. The dataset is divided into several categories, such as cancer, diabetes, and Alzheimer’s disease.

4.UCI Machine Learning Repository

The UCI Machine Learning Repository is a collection of databases, domain theories, and data generators that are used by the machine learning community for the development and evaluation of machine learning algorithms. The repository is also a source of medical image datasets for research purposes.

5.Stanford Medical ImageNet

The Stanford Medical ImageNet is a petabyte-scale searchable repository of annotated de-identified clinical (radiology and pathology) images, linked to genomic data and electronic medical record information, for use in rapid creation of computer vision systems. It were created by Stanford University for use in research on medical image analysis. The datasets contain a variety of images, including X-rays, MRI scans, and CT scans.

6.Open Images Dataset

The Open Images Dataset is a large-scale, open-source dataset that contains over 9 million images. The dataset is organized into over 15,000 categories, and each image is labeled with one or more of these categories.

7.Cancer Imaging Archive

Cancer Imaging Archive (TCIA) is a large archive of medical images of cancer, available for public download. The archive is maintained by the National Cancer Institute (NCI) and includes images from a variety of cancer types.

8.Alzheimer’s Disease Neuroimaging Initiative

The Alzheimer’s Disease Neuro Imaging Initiative (ADNI) image datasets are a collection of brain scans and related data from people with Alzheimer’s disease, healthy older people, and younger people. The datasets are used by researchers to study the progression of Alzheimer’s disease and to develop and test new treatments.

9.Google Dataset Search

Google Dataset Search is a search engine for finding datasets online. It includes data from a variety of sources, including government agencies, universities, and businesses. The search engine includes a variety of filters so that users can narrow their search to find the specific type of data they are looking for.

10.Figshare

Figshare is a popular open-access research repository that provides free access to datasets across fields such as healthcare, engineering, environmental science, social sciences, and computer science. In addition to downloading datasets, researchers can upload and share their own datasets, figures, and research outputs, with each published item receiving a Digital Object Identifier (DOI) for permanent citation and improved research visibility.

11.Mendaley Data

Mendeley Data is an open research data repository that allows users to discover and download free datasets from a wide range of research disciplines. Researchers can also upload, store, and share their own datasets, with each published dataset receiving a Digital Object Identifier (DOI) to support proper citation, long-term accessibility, and research reproducibility.

12.Data.Gov

Data.Gov is the U.S. government’s open data portal, providing free access to hundreds of thousands of public datasets covering domains such as healthcare, agriculture, climate, education, transportation, and economics. It is a trusted resource for researchers, developers, and policymakers seeking high-quality, government-published data for analysis, visualization, and application development.

13.European Data Portal

European Data Portal is the official open data platform of the European Union, offering free access to datasets from EU institutions and member countries across domains such as environment, healthcare, transportation, energy, and public administration. It enables researchers, developers, and organizations to discover and reuse high-quality public data for research, innovation, and data-driven decision-making.

14.NCBI Dataset

NCBI Datasets is a free resource provided by the National Center for Biotechnology Information (NCBI) that offers access to high-quality biological and genomic datasets, including genome sequences, gene information, proteins, and related biomedical data. It is widely used by researchers in bioinformatics, genomics, and life sciences for data analysis, scientific research, and reproducible studies.

15.PhysioNet

PhysioNet is a free, open-access repository of clinical and physiological datasets, including MIMIC-IV, MIMIC-III, eICU Collaborative Research Database, PTB Diagnostic ECG Database, and MIT-BIH Arrhythmia Database. While many datasets are freely available, restricted datasets (such as MIMIC-IV and eICU) require users to complete data-use agreements, credential verification, or ethics training before access is granted.

16.GDC Data Portal

GDC Data Portal is a free repository developed by the National Cancer Institute (NCI) that provides access to comprehensive cancer genomics and clinical datasets from projects such as The Cancer Genome Atlas (TCGA) and TARGET. While many datasets are openly accessible, controlled-access genomic and patient-level data require authorization through the appropriate data access procedures to protect patient privacy.