Spreadsheet Column Profiler
Profile column types, blanks, uniqueness, maximum text length and sample values before mapping or importing a dataset.
Runs in your browserOpen tool →Free browser spreadsheet tools
Compare, dedupe, merge and inspect spreadsheets without uploading them
Public V8 tools run locally in your browser. Use the logged-in Reconcile app only when you intentionally need saved jobs, advanced matching, audit history or server exports.
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Key Column Finder
Score spreadsheet columns by completeness and uniqueness to identify likely employee, invoice, asset or transaction keys.
Runs in your browserOpen tool →Spreadsheet Data Quality Checker
Measure blanks, outer whitespace, repeated values and case inconsistencies that can interfere with matching and reporting.
Runs in your browserOpen tool →Remove Duplicate Rows from CSV or Excel
Remove repeated spreadsheet rows by a selected key and download a clean file locally.
Runs in your browserOpen tool →Remove Duplicates from a List
Remove repeated lines while preserving the first occurrence and the original readable capitalization of each unique value.
Runs in your browserOpen tool →Find Duplicate Rows
Find every repeated key in a CSV, TSV or XLSX file and export the affected rows for review or correction.
Runs in your browserOpen tool →Split Text into Columns
Convert delimited lines into a structured table and downloadable CSV using comma, tab, semicolon or pipe separators.
Runs in your browserOpen tool →Find Missing Records Between Two Files
Find keys that exist in one spreadsheet but not the other, entirely in your browser.
Runs in your browserOpen tool →Compare Two Lists
Find values that appear in both lists, only in the first list or only in the second list after safe normalization.
Runs in your browserOpen tool →Compare Two CSV or XLSX Files
Compare two spreadsheet files using a selected key and group records into matched, missing, duplicate and conflicting buckets.
Runs in your browserOpen tool →Merge and Combine CSV Files
Append two CSV, TSV or XLSX datasets and align their fields by header name in a downloadable CSV export.
Runs in your browserOpen tool →Formula Health Checker
Inspect a pasted formula or the first worksheet in an XLSX file for broken references, fragile lookups and performance risks.
Runs in your browserOpen tool →Smart Schema Mapper
Suggest column mappings between two files using normalized header names, business synonyms and sampled data types.
Runs in your browserOpen tool →Focused workflows
Popular tool variants
These pages use the same audited browser engines with task-specific instructions, examples and defaults.
Compare Two Excel SheetsCompare Two CSV FilesFind Missing Rows Between Two FilesCompare Files by Key ColumnCompare Two Columns OnlineExcel Diff OnlineRemove Duplicates from CSVDedupe a List OnlineJoin CSV Files by IDInner Join CSV FilesLeft Join CSV FilesRight Join CSV FilesFull Outer Join CSV FilesMerge Excel FilesNo-Upload CSV MergeCombine Files with Different Columns