ExploreMyData
Opens, queries, and converts CSV, Excel, JSON, or Parquet files locally in the browser
ExploreMyData opens CSV, Excel, JSON, Parquet, PDF, and several other formats directly in the browser tab, up to 1 GB, and runs real DuckDB SQL queries, joins, pivots, and format conversions without uploading the file anywhere — it invites you to check the network panel yourself to confirm. Beyond conversion it profiles columns for nulls and outliers, merges or joins files on a key, and generates synthetic test data as real Parquet or SQLite. The site lists 121 converters and 74 dashboard templates, free with no account.
What holds up
- +Files never leave the browser — the site itself invites you to verify this in devtools
- +Runs real DuckDB SQL with joins and window functions on the file you just opened
- +Free with no account, handling files up to 1 GB across a dozen formats
Mind the limits
- −Some links from a URL are refused due to cross-origin restrictions, with no workaround offered
- −Browser-based processing of a 1 GB file depends on the device's own memory and speed
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