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Engineering notes

Files too big for Excel.

What breaks in an ordinary spreadsheet, why it breaks, and what to do instead.

4 Oct 2026How to color rows by a rule in a large CSV, without changing the fileHighlight every row where the amount is over a limit, a status is overdue or a name matches, in a CSV too big for Excel's conditional formatting. Keep the colours when you export to Excel.4 Oct 2026How to remove near-duplicate rows from a CSV, not just exact copiesRemove Duplicates only catches rows that match exactly. Here is how to find and remove rows that differ by a capital, a space or a typo, and check each group before anything is deleted.4 Oct 2026How to search for a name or value across several CSV files at onceFind a name, invoice number or email in every CSV you have open without opening them one by one. Files with matches first, then jump straight to the cell.1 Oct 2026How BigXL Protects Sensitive Data on Your DeviceWhere BigXL keeps its working copies, how long they last, when they are encrypted, and what remains a normal export you control.1 Oct 2026How Investigators, Auditors and Compliance Teams Save Hours Cleaning SpreadsheetsFive jobs that eat the afternoon in forensics, audit, healthcare and legal teams: merging call records, matching vendor names typed five ways, finding repeats, comparing two ledgers, and hiding personal data before sharing. Each one worked through with screenshots, offline.27 Sept 2026Get Started With Bix: Ask, Chart, Clean, and Export Your DataA hands-on guide to BigXL's fine-tuned, on-device AI. Download a sample CSV, try real prompts, inspect the SQL, make a chart, and save your answer.26 Sept 202621 Types of Charts and Graphs, and When to Use Each OneA plain guide to 21 chart types with a real example of each, plus six charts BigXL makes from your file before you pick anything: bar, column, line, area, pie, donut, histogram, box plot, dot plot, stacked and grouped bars, 100% stacked, heatmap, treemap, sunburst, sankey, Pareto and waterfall. What question each one answers, and when to pick something else.25 Sept 2026How to Clean Recurring CSV Exports Without Redoing the Work Every MonthNine jobs that break every time a monthly export arrives: renamed headers, money that will not add up, debit and credit in two columns, files that must be merged, split or compared. Done locally, without Excel.25 Sept 2026How to Compare Two CSV Files and See Exactly What ChangedFind added, removed and changed rows between two CSV exports without VLOOKUP in both directions. How duplicate keys and blank keys silently break a comparison, and what to do about them.25 Sept 2026How to Merge CSV Files With Different Columns Without Corrupting the DataCombine CSV files whose headers are renamed, reordered or missing. Why cat and copy-paste silently corrupt the result, and how to merge by column name instead of position.24 Sept 2026Call Detail Record (CDR) Analysis: How to Clean, Correlate, and Analyze Telecom CSVsInvestigating multi-carrier Call Detail Records (CDRs) and cell tower dumps in CSV. How to fix scientific notation truncation, normalize timestamps, and correlate evidence offline.24 Sept 2026How to Analyze Large DFIR Timelines and MDE Exports in CSV Without Freezing ExcelInvestigating multi-gigabyte MDE timeline exports, EVTX logs, and forensic artifacts in CSV. Learn how to correlate multi-source timelines without memory crashes or cloud leaks.23 Sept 2026How to Fix 'Excel Out of Memory' Errors on Large CSV FilesWhy 64-bit Excel throws 'Available Resources' or 'Out of Memory' errors on multi-gigabyte CSV files, and how to open and work with them anyway.23 Sept 2026How to Join Two Large CSV Files Without Freezing ExcelRunning VLOOKUP or XLOOKUP across two multi-gigabyte CSV files freezes your computer. Here is how to join large CSV files quickly without crashing.22 Sept 2026How to Open and View Parquet Files in a SpreadsheetData teams send Apache Parquet files because they are fast and compact, but Excel cannot open them. Here is how to open and view Parquet files without writing Python code.22 Sept 2026How to Open a CSV.GZ File Without Unzipping ItOpening compressed .csv.gz files usually requires gigabytes of disk space and minutes of extraction time before Excel crashes. Here is how to view and query .csv.gz files directly.21 Sept 2026How to deduplicate a large CSV file without running out of memoryHow to remove duplicate rows from 10 million CSV rows or multi-gigabyte files on Windows, macOS, and Linux without crashing Excel or pandas.21 Sept 2026Why Excel turns long numbers into scientific notation (and truncates them)Why opening a CSV turns account numbers, barcodes, and IDs into 8.43E+12 or replaces the last digits with zeros, and five ways to preserve full numeric precision.20 Sept 2026Ask Questions to Your CSV Data Using Local AI (No Cloud Upload)Chat with your massive CSV files using plain English, entirely offline. A secure alternative to ChatGPT Advanced Data Analysis that never uploads your data.20 Sept 2026How to Mask PII in CSV Files Without Uploading to Cloud ToolsUploading sensitive customer data to online CSV editors violates compliance. Learn how to securely redact PII and anonymize data entirely offline using BigXL.19 Sept 2026The Best Free CSV Viewers to Open Large Files FastA free CSV viewer for Windows, Mac and Linux that opens large files without crashing. What each one can do, what it cannot, and which to pick.19 Sept 2026How to Analyze Massive Datasets Without Splitting Large CSV FilesSplit a large CSV into smaller files on Windows, macOS or Linux, keep the header on every part, and know when splitting is the wrong answer.18 Sept 2026Handling Complex CSV Date Formats Without CorruptionWhy opening a CSV turns dates into five-digit numbers like 45182 or silently swaps day and month, and how to fix mixed dates across millions of rows.18 Sept 2026How to Open Massive CSV Files When Excel Crashes or FreezesExcel keeps crashing on a large file, freezing, or saying the data set is too large for the Excel grid. Why it happens and five ways to open the file anyway.17 Sept 2026Converting Large CSVs to Excel Smoothly with BigXLConvert a CSV to XLSX on Windows or Mac, stop Excel mangling IDs, leading zeros and dates on import, and know what to do when the file is too big to convert.17 Sept 2026Moving Beyond the 1,048,576 Excel Row Limit SmoothlyThe Excel row limit is 1,048,576 rows and 16,384 columns. Why it exists, why it cannot be increased, and five ways to work with a file that has more rows.17 Sept 2026Lightning-Fast Data Joins When VLOOKUP Freezes ExcelWhy dragging VLOOKUP or XLOOKUP down a large sheet locks up Excel with Calculating 4 Threads, and five ways to join large CSV files without freezing your computer.