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Supported file types

There is no restriction on file types that can be uploaded or downloaded on, and a dataset can consist of any combination of files added to it. There are some size limitations, and files are handled differently based on the extension as follows:

Database file formats

Formats: sqlite

Database dumps will consist of multiple tables, and a schema that models the type information and the relationships between those tables. Each table will be represented as a table, which can be previewed and queried naturally via our SQL engine.

Tabular files

Formats: csv, tsv, xls, xlsx

Tabular files are presented in a spreadsheet-style preview and we perform basic analyses on each of the columns:


The data is then queryable using SQL and SPARQL; take a look at Query basics for more info on getting started with querying.

To provide these querying capabilities and in line with our mission to connect the world’s data (by making it linkable), we’re converting it to RDF Triples, or graph data, under-the-hood.

Excel files will include all of the underlying sheets in a tabbed interface. Only the tabular data will be included; other elements like pivot tables and charts will not be shown in the preview but they will still be available in the original file.


The character # at the beginning of a line in CSV and TSV files is ignored during upload. If you have lines beginning with a #, they will not render correctly on

In addition to viewing a preview of the data in the table, you can also see the metadata for the table by clicking on Switch to column overview. The ability to switch between the data preview and the column overview persists in the summary even after it's been saved.

RDF data

Formats: rdf, rdfs, owl, jsonl, nt, ttl, n3

These formats are serializations of RDF data - since RDF is the native data format for’s platform, the statements in this file are simply loaded into the graph for the dataset or project that the file is added to. By uploading raw RDF data into a dataset or project, that data is searchable via the attached SPARQL endpoint. We show a preview of the contents of the file, including summaries of the classes, properties, and namespaces used in the file.

Structured files

Formats: json, ND-JSON, other 'sufficiently tabular' json files

When a JSON file has a "sufficiently tabular" structure, we will attempt to produce a table of data that represents the contents of the file. Common logging formats that include JSON arrays of simple objects or newline-separated JSON objects will generally work great with this interpretation. If the structure of the file is too hierarchical or inconsistent in nature, the file will instead be treated in its raw form - you can view or download the file, but it’s not queryable through our query engine.

Archive and compressed formats

Formats: zip, tar, tbz2, tbz, bz2, tgz, gz, -gz, z, -z

Archives that contain multiple files can be extracted and the first 50 files are stored in the dataset. Each extracted file is then handled using the criteria established for its extension. Please note that archives are not extracted by default. To do so, a Contributor must click on the ‘Extract’ button on the right-hand side of the archive.

Individual files that are compressed (i.e. foo.csv.gz) are decompressed and then treated as though the uncompressed file had been added directly.


Formats: jpg, jpeg, png, gif, svg

Images are displayed in-line.

Source files

Formats: ipynb (version 4 and higher), js, r, py, as, apl, bash, bas, bat, c, cpp, cs, css, d, dart, diff, go, ini, java, julia, kt, lua, matlab, nasm, ml, perl, php, ps1, rb, scala, sql, tcl, ts, vim, yaml, xml, asp, jade, tex, less, sass, scss, Dockerfile

Source files are presented with full syntax highlighting where appropriate.


Formats: txt, html, md, pdf

The above document formats are rendered during preview. Other document types can be uploaded but are not available for preview.

Note that iframe embeds are not rendered in html files. Instead, try adding it as an insight in a Data project.

All other file types can be uploaded and downloaded as long as they are within the supported size limits.