Data Demon Systems

/tools/csv-viewer

Large CSV Viewer & Editor

Inspect RFC 4180 CSV and TSV as logical records, keep identifiers as text, make bounded edits and export locally.

csv-viewer://local

1. Source

Choose local CSV or TSV

Drop a CSV or TSV file here

UTF-8 · one file · source remains immutable

2. Search and filters

Find rows without changing the index

All rows
Likely exposure
Column filters1 of 8 AND filters

3. Virtual table

Rows and columns

4. Row details and edit overlay

Selected row

Select a row after indexing to inspect and edit its fields.

5. Profiles

Column evidence

Column profiles appear after indexing.

6. Export

Preview, redact and export

No redaction category is selected automatically. Unchanged CSV records are copied byte-for-byte; edited, redacted or column-filtered records are reserialised.

Explicit redaction

Preview the export to confirm its active filters, edits and redaction categories.

The first 20 matching records will appear here after preview.
Choose a UTF-8 CSV or TSV file, paste a small example, or use the sample.

/architecture

A local viewer built around CSV records

Logical record streaming

One MiB slices preserve escaped quotes, split Unicode, CRLF and embedded newlines while sparse checkpoints support seeking.

Bounded DOM

Only a small window of rows and columns exists in the page. The selected row is loaded separately for full inspection.

Text stays text

Leading zeroes, long integers and date-like identifiers remain exact strings unless JSON inference is explicitly enabled.

Immutable source

Edits and exclusions live in a bounded overlay. Downloads receive deterministic filtered or redacted names.

/limits

Deliberate large-file boundaries

Individual record inspection is bounded at 8 MiB, profiling covers the first 2,000 columns, rendered cells remain below 3,000, and a browser without Save File support uses a 100 MB Blob fallback. Numeric multi-gigabyte claims remain withheld until the opt-in Chromium benchmark passes.

/faq

CSV viewer questions

Can it open TSV and semicolon-delimited files?

Yes. Comma, tab, semicolon and pipe detection is automatic, with a manual override that rebuilds the index.

Can I sort or insert rows?

Not in version one. Global sorting, insertion and reordering conflict with bounded operation. Cell/header edits and row/column exclusions are supported.

Are exposure findings proof?

No. They are conservative, masked signals for operator review. Redaction never activates without an explicit category choice.