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37 small tools for the jobs that interrupt real work: turning a PDF bank statement into a table, comparing two versions of a file, opening a CSV that Excel will not, merging a folder of exports. All of them run in your browser — the file is read by JavaScript in the tab and is never uploaded — and none of them ask for an email address.

Compare two Excel filesCell-by-cell diff of two spreadsheets, in the browser, with nothing uploaded. CSV viewer onlineOpen, search, sort and export a CSV or XLSX without uploading it or installing anything. CSV to Excel converterTurn a CSV into a real .xlsx workbook — delimiter detected, nothing uploaded. XLSX to CSV converterTurn an .xlsx workbook into a CSV — pick the sheet, get UTF-8, nothing uploaded. Spreadsheet compareWorkbook-level comparison: which sheets changed and by how much, before you look at cells. Compare two Excel sheetsTwo tabs in one workbook, diffed cell by cell or on a key column. Compare two lists onlinePaste two lists, get what is in both and what is only in one, with duplicates counted. Merge CSV files onlineCombine many CSV or Excel exports into one table, matching columns by header name. Split a CSV fileCut a CSV into equal chunks or into one file per column value, header repeated in each part. Combine Excel files into oneSeveral workbooks into one file — one sheet per file, or all rows stacked into one table. Highlight duplicatesColor repeated values in your own sheet — one color per group — and download the highlighted .xlsx. Excel duplicate finderFind duplicates in Excel — repeated values, duplicate rows, or values shared by two columns — and download the clean file. CSV to Markdown tableTurn a CSV or spreadsheet into a padded Markdown table ready for a README or a pull request. Bank statement converterPDF bank statement to CSV or Excel, parsed in the browser, with nothing uploaded. Weird characters in a CSVDetects what a CSV was really saved as, and exports it as UTF-8. Compare two columns in ExcelPick two columns out of your own file and get matches, gaps and repeats at once. Compare two CSV filesA CSV diff that lines rows up by a key column instead of by line number. Fuzzy match two listsMatch values that are close but not identical, with a visible score for every pair. Compare two JSON filesA structural JSON diff that answers in paths, not in two panes to read. Compare two XML filesAn XML diff that reads the tree, so an attribute change is a finding with a path. Reconcile two tables by keyBank statement against ledger, invoices against payments: matched by reference, amounts compared, the leftovers listed. Bank reconciliation templateDownload the workbook, then match this month’s statement against your ledger right here. Excel to SQL statementsA sheet or CSV becomes a CREATE TABLE plus batched INSERTs, with column types inferred, in four dialects. JSON to CSV converterTurn an API response or a .json export into a CSV, nesting and all, without uploading it. CSV to JSON converterA CSV or spreadsheet becomes JSON with the value types you would have written by hand. JSON to Excel converterPaste JSON, get an .xlsx — no Power Query, no upload, nesting flattened into columns. Excel to JSON converterAn .xlsx sheet becomes JSON in the shape your consumer wants, with sane value types. XLSX viewer onlineOpen and read an Excel workbook in a browser tab — every sheet, searchable — without uploading it. CSV to SQL statementsA CSV becomes a CREATE TABLE plus batched INSERTs, with column types inferred, in four dialects. Excel to Markdown tableA spreadsheet becomes a Markdown table you can paste into a README or a pull request. Count unique values in a columnPick a column and get the unique count plus a frequency table, without writing a formula. Remove empty rows and stray spacesStrip empty rows — including the ones holding an invisible space — and download the clean sheet. Text to columnsSplit one column by any delimiter — a word, a comma, whitespace — into columns or rows, without overwriting. XML to ExcelXML in, table out: the repeated element becomes the rows, attributes and children become columns. Unpivot a tableWide to long: one column per month becomes one row per month, without Power Query. TSV to CSVTab-separated in, properly quoted CSV out — commas inside values stay inside their cell. Trim spacesClean every cell of stray spaces — including the non-breaking and zero-width ones Excel's TRIM leaves behind.

Documents and financial data

Three pages on getting numbers out of documents and into a report. The PDF invoice reader and the monthly report generator run in your browser like the tools above; the statement page is a guide to which route to take first. None of them reads a scanned page — that takes OCR, and we are not going to pretend otherwise.

Invoice data extractionThree routes from invoice to spreadsheet, and what each one does with the document. PDF statements to ExcelBank, card and broker statements into a spreadsheet — starting with the route most people skip. Monthly report generatorTransactions in, month-by-category report out — in the browser, nothing uploaded.

Articles and definitions

ArticlesLonger write-ups on PDF tables and what AI really changes about analysis. GlossaryPlain definitions of data terms, each with the caveat the usual definition skips.

Why these run in the browser and not on a server

The spreadsheets people most need a quick tool for are the ones they are least free to upload: a payroll file, a client's trial balance, an export with customer names and phone numbers in it. Most free tools in this category process the file server-side, which turns a two-minute task into a disclosure.

These pages read the file with JavaScript in your tab. The .xlsx unzipping uses the browser's own DecompressionStream; the parsing, diffing and writing all happen on your machine. There is no upload endpoint to trust, because there is no upload. Open your browser's network tab: no request carrying your data appears.

What they need

A modern browser with JavaScript on. Reading .xlsx needs Chrome 103+, Safari 16.4+ or Firefox 113+; CSV works everywhere. Files are held in memory while they are processed, so the practical size limit is your machine's RAM rather than a row cap we impose.

And when the same file comes back every month

These tools are for the one-off: drop the files, take the result, close the tab. When the same export arrives every period and has to be checked and handed over the same way, the steps belong somewhere that remembers them.

TableDI 2 is a desktop app for file work you redo every period: it keeps your sources, rules and delivery as a job, so next month you drop in the new files and run it again. Everything runs on your own machine.

Related

Excel guidesThe row limit, and what to do past it GlossaryPlain definitions, with the caveats HelpGuides for the desktop app

Doing this every month?

In TableDI 2 you do it once, then save it as a job. Next month you drop in the new files and run it again.

Download TableDI 2 free See what's free

macOS, Apple silicon and Intel; Windows is in progress (what to do meanwhile). Free is not a trial — no account, no card.

Last reviewed 2026-09-11 by the TableDI team. Something wrong on this page? Tell us — it is one inbox, read by the people who build TableDI.