5 Common Excel Data Tasks You Can Now Do Entirely in Your Browser

Spreadsheet software has historically required expensive licences, specific operating systems, or complex desktop installations. But for many everyday data tasks, your web browser is now more than powerful enough. Here are five things you can do with CSV and Excel files entirely in the browser — for free.

1. Merge Two Files Like a SQL JOIN

Combining data from two spreadsheets used to mean wrestling with VLOOKUP formulas. Browser-based merge tools let you select a key column, choose a join type (INNER, LEFT, RIGHT, or FULL OUTER), and download the merged result as CSV — all without any formula knowledge.

2. Compare Two Versions of a Spreadsheet

Tracking what changed between two exports or two versions of a dataset is a common but tedious task. A browser-based diff tool highlights added rows (green), removed rows (red), and modified rows (amber) — showing you exactly which cells changed in each modified row.

3. Find and Remove Duplicates With Grouping

Excel's Remove Duplicates button deletes duplicates immediately and silently. Browser deduplication tools let you preview grouped results first — showing how many times each unique combination appears — so you can make an informed decision about what to keep.

4. Create Pivot Tables From CSV Data

Pivoting converts long-format data (one observation per row) into wide-format summaries (values spread across columns). Browser pivot tools apply Sum, Count, Average, Min, or Max aggregations and export the result as a clean CSV — compatible with any reporting tool.

5. Download Offline Guides

Beyond the tools themselves, the best browser-based utilities come with downloadable offline guides — self-contained HTML pages you can open without an internet connection. These are useful for teaching colleagues, embedding in company knowledge bases, or keeping as reference material.