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15 tools — all free, no sign-up, processed locally in your browser.

Convert Excel and CSV, remove duplicate rows, merge and match tables (like VLOOKUP), filter and sort, split sheets, standardize fields and compare spreadsheets, plus batch renaming, color and unit tools. Long IDs and formulas are protected, and files are never uploaded.

XLSX to CSV and TSV

Choose a sheet, delimiter and formula protection, preview and export or continue to cleanup.

CSV and TSV to XLSX

Choose text encoding and delimiter, preview and export text-preserving Excel files.

Remove duplicate table rows

Clean Excel/CSV data, keep first or last duplicates, and export removed records.

Split and merge columns

Import Excel/CSV, split, combine and reorder columns, then continue to cleanup.

Batch file renamer

Use text replacement, prefixes and custom numbering; preview conflicts and download a ZIP.

ZIP compressor and extractor

Create or extract ZIP archives locally in your browser.

Color format converter

Convert colors between HEX, RGB and HSL formats.

Color contrast checker

Measure contrast between text and background colors.

JSON, CSV and Excel converter

Convert JSON object arrays to CSV or XLSX, and spreadsheet rows to JSON.

Merge and match spreadsheets

Append by headers or match composite keys with left, inner or full joins; export unmatched rows.

Markdown table generator

Paste Excel, CSV or Markdown tables, edit cells and alignment, then export Markdown or CSV.

Filter, sort and summarize tables

Filter by multiple conditions, sort columns, group and summarize, then export results.

Table field standardizer

Standardize dates, amounts, IDs, mappings and empty cells by column, with change previews and error reports.

Split spreadsheets by values or rows

Split by column values or a fixed row count, then download a multi-sheet Excel file or ZIP.

Excel and CSV diff

Compare two tables by one or more key columns, inspect additions, deletions and changes, and export the differences.

Frequently asked questions

How are formulas handled?

The cached results saved in the file are used. Formulas without cached results raise an error; nothing is recalculated.

What if characters look garbled?

Choose the correct encoding; older Chinese systems often export GB18030/GBK. Convert once the preview looks right.

How do I dedupe by specific columns?

Choose one or more columns as a combined key; only rows identical in those columns count as duplicates.

Does whitespace count as an empty value when splitting?

No. Splitting uses the literal separator, at every, the first or the last occurrence.

Are my original files changed?

No. The tool creates renamed copies in a ZIP.

Are RAR or 7z supported?

Only the ZIP format is supported.

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