Useful Spreadsheet Tools starting points

Jump into a common task, then use the full directory below for more specialized tools.

Excel to CSV Converter CSV Delimiter Converter CSV Editor CSV Duplicate Remover CSV Merger JSON to Excel Converter

25 browser-local data tools

Spreadsheet Tools

Open, edit, validate, clean, join, reshape and convert CSV or spreadsheet data with browser-local workflows and explicit file-format limits.

Inspect → clean → reshape → export

turns the spreadsheet category into a connected data workflow. Start by viewing the table, repair structure before conversion, then filter/join/pivot only when that changes the actual job.

Open & edit

Inspect CSV or Excel data first, then make specific browser-local cell edits when needed.

CSV ViewerPaste or load delimited data, inspect the table and structure locally, then move into editing, validation, filtering, joining, or conversion without uploading the file.CSV EditorPaste or load delimited data, edit cells in a bounded browser grid, add rows or columns, and download the revised CSV locally.Excel ViewerChoose a workbook, inspect a worksheet in browser memory, and use the adjacent CSV/Excel tools when you need to clean, convert, or reshape the data.

Validate & clean

Diagnose structure, normalize headers/rows, remove duplicates, filter/sort data, change delimiters, or keep selected columns.

CSV Validator & RepairPaste or load CSV/TSV, review concrete structural issues, choose safe cleanup options, preview the repaired table, and download a new file without changing the original.CSV Duplicate RemoverChoose the identity columns that define a duplicate, preview the retained rows, and export a deduplicated copy locally.CSV FilterParse the table correctly first, choose a field and condition, inspect the match count, and download only the filtered rows.CSV SorterChoose a header column, ascending or descending order, and text or numeric comparison without uploading data.CSV Delimiter ConverterAuto-detect the source separator, parse quoted data, and serialize with a different delimiter.CSV Column ExtractorChoose columns by header name, reorder them, preview the result, and download a smaller CSV.

Combine & reshape

Merge files, join tables by key, split large exports, transpose axes, or summarize rows with a pivot table.

CSV MergerChoose multiple CSV files, preserve the union of columns, review the merged row count, and download a combined copy locally.CSV JoinerPaste or load two delimited tables, choose the key column on each side, preview matched rows, and export the joined CSV locally.CSV SplitterChoose the maximum data rows per output file, preview the part count, and download individual chunks without uploading the CSV.CSV Transpose ToolFlip a parsed table across its diagonal while preserving quoted field values.CSV Pivot TableChoose row, column, and value fields from a parsed CSV table and build a downloadable pivot summary without uploading the source file.

Convert formats

Move tabular data between CSV/TSV, JSON, Excel, HTML and Markdown while keeping the conversion local where supported.

CSV to JSON ConverterParse quoted and multiline delimited data in the browser, export JSON objects or rows, and review structural issues before conversion when needed.JSON to CSV ConverterPaste or load JSON, flatten top-level object values into columns, preview the output contract, and download delimited text without sending data to a server.Excel to CSV ConverterOpen a spreadsheet locally, choose a worksheet, preview its rows, and download normalized CSV without uploading the workbook.CSV to Excel ConverterPaste or load delimited data, preview the parsed table, and create a downloadable XLSX workbook in your browser.Excel to JSON ConverterOpen XLSX/XLS locally, choose a sheet, use the first row as headers, and download formatted JSON.JSON to Excel ConverterPaste an array of objects or rows and create a spreadsheet locally in your browser.TSV to CSV ConverterPaste TSV data with quoted or multiline fields and export comma-separated text locally.CSV to TSV ConverterParse quoted CSV correctly and export a clean TSV table without uploading data.CSV to HTML Table ConverterParse delimited data, escape cell content, and generate a table with the first row as headers.HTML Table to CSV ConverterPaste HTML containing a table and extract visible th/td text into downloadable CSV.CSV to Markdown Table ConverterParse quoted CSV, escape pipe characters, and generate copyable Markdown table syntax.

All Spreadsheet Tools

Spreadsheet Tools