Datablist
datablist.com
Spreadsheet built for cleaning and deduplicating messy list exports
Free tier
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Clean, join, query and visualise tabular data in a tab.
datablist.com
Spreadsheet built for cleaning and deduplicating messy list exports
datawrapper.de
Turns a pasted table into a publication-quality chart in four steps
db-fiddle.com
Run a schema and a query against real MySQL, Postgres or SQLite
shell.duckdb.org
Run SQL over your own CSV or Parquet file without uploading it
flourish.studio
Animated and scrollable data stories from a spreadsheet of numbers
datasetsearch.research.google.com
Finds published datasets across repositories, governments and journals
kaggle.com
Community-uploaded datasets with notebooks showing how people used them
mockaroo.com
Generates realistic fake test data in CSV, JSON or SQL
observablehq.com
Reactive JavaScript notebooks for exploring data and building charts
ourworldindata.org
Long-run global data on health, energy and poverty, free to reuse
rawgraphs.io
Makes the chart types nothing else offers — alluvial, beeswarm, treemap
tableconvert.com
Converts a table between CSV, JSON, Markdown, SQL and Excel
Privacy
These process everything inside the browser. Load the page, disconnect from the network, and they still work.
shell.duckdb.org
Run SQL over your own CSV or Parquet file without uploading it
rawgraphs.io
Makes the chart types nothing else offers — alluvial, beeswarm, treemap
tableconvert.com
Converts a table between CSV, JSON, Markdown, SQL and Excel
By task
Archive
Kept on record so an old bookmark still leads to an answer. Each one names the site that does the job now.
editgrid.com
A collaborative spreadsheet with live remote data, before Google Sheets
Questions
There is no single answer, which is why this page lists 12 of them with their limits stated. If you want to avoid signing up entirely, 6 of these work with no account at all.
3 of the 12 sites here process your file inside the browser and never upload it — they are marked "On device". The rest send your input to their server, which is fine for public material and worth thinking twice about for anything personal.
Some already have. 1 entry in this category has been retired and moved to the Archive with a working successor, so an old bookmark still leads somewhere useful.