JustForShow

Big files, light samples

Big files, light samples.
Structure fully preserved.

Batch-extract the header and first N rows of your data files into a 1:1 mirrored folder structure, producing a lightweight sample dataset in seconds.

Runs entirely on your machine: no network access, no uploads, no telemetry.

✔ Windows 10 / 11 ✔ .xlsx / .xls / .csv ✔ Fully offline ✔ Free during public beta
Public beta Currently in free public beta: fully functional at no cost. Feedback welcome: feedback@weibaba.fun

Samples that behave like the real thing

Not a crude truncation — the folder structure and file shape are carried over 1:1, so your samples feel like real data for testing, demos and integration work.

.xlsxall sheets kept, names and order unchanged .xlsall sheets kept, names and order unchanged .csvencoding / delimiter / line endings auto-detected and preserved .json / .jsonl / .parquetplanned for future versions

1:1 folder mirroring

The output folder mirrors the source structure exactly (including empty folders), same file names and formats — every level lines up.

Multi-GB files, no freezes

Streams only the head of huge files — touching just the beginning, so even multi-GB files sample in seconds.

Live preview, WYSIWYG

Preview headers and leading rows live in the app — you know exactly what each sample looks like before exporting.

Global + per-file row counts

Two-level control over sample rows: one global default plus per-file overrides; set 0 to keep headers only.

Recursive scan, per-format filter

Recursively scans the source folder with per-format filtering; non-data files can be skipped or copied as-is.

Progress and summary

Live progress, per-file logging, and a size-reduction summary — what was exported and how much was saved, at a glance.

Download from Microsoft Store

Microsoft Store is the only authoritative channel — fully functional and free during the public beta.

Get JustForShow

Store listing: apps.microsoft.com/detail/9P30MRGVSPJV · Feedback: feedback@weibaba.fun

JustForShow UI - file list and data preview
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