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Feature checklists make every tool look equivalent. This table leads with the three things that actually differ — what it costs you before it works, whether your files leave your device, and where the free version stops.
| TableConverttableconvert.com | DuckDB Web Shellshell.duckdb.org | Datablistdatablist.com | DB Fiddledb-fiddle.com | |
|---|---|---|---|---|
| What it does | Converts a table between CSV, JSON, Markdown, SQL and Excel | Run SQL over your own CSV or Parquet file without uploading it | Spreadsheet built for cleaning and deduplicating messy list exports | Run a schema and a query against real MySQL, Postgres or SQLite |
| What it costs you | No sign-upWorks the moment the page loads. No account, no email, no trial. | No sign-upWorks the moment the page loads. No account, no email, no trial. | Free tierA genuinely usable free tier with paid plans for volume or team features. | No sign-upWorks the moment the page loads. No account, no email, no trial. |
| Your files | Runs on your device | Runs on your device | Runs on their server | Runs on their server |
| Where it stops | Files over 10 MB are refused by the free web converter. | Nothing persists between sessions, and very large files are limited by the browser's available memory. | Requires an account, data is stored on their servers, and the free plan caps items per collection. | Fiddles are public and short-lived, and query runtime is capped. |
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| Category | Data, Tables & Charts | Data, Tables & Charts | Data, Tables & Charts | Data, Tables & Charts |
| Last checked | 2026-07-29 | 2026-07-29 | 2026-07-29 | 2026-07-29 |
| Open the site | Open | Open | Open | Open |
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