Free data tools, no upload required
Every tool below runs entirely in your browser — your file never touches a server. When viewing isn't enough, one click sends the data to the analysis workspace.
CSV Viewer
Drop a CSV and read it as a clean, sortable, searchable table.
CSV Splitter
Split a big CSV into smaller files by row count.
CSV Merger
Combine multiple CSVs into a single file — even when columns differ, the merger unions the headers and aligns every row.
CSV Editor
Open a CSV in an editable grid, correct the cells that need fixing, and download the cleaned file.
Excel Viewer
View any Excel workbook in your browser: switch between sheets, sort and search, no Office license needed.
Sentiment Analyzer
Paste reviews, survey answers, or feedback — one per line — and get instant positive/negative scoring.
Word Frequency Counter
Paste any text and see its most frequent terms with counts and a visual ranking — stopwords filtered, everything computed in your browser.
These are single-purpose utilities for the unglamorous half of data work — opening, splitting, merging, and sanity-checking files before any analysis happens. All seven run entirely in your browser: no upload, no account, no file size games. Your data never leaves your machine on these pages.
Which tool do you need?
Each tool page explains the underlying task properly — including how to do it in Excel, Sheets, or the command line if you'd rather not use a browser tool at all. The goal is that the page solves your problem even if you never click anything.
| Task | Tool | Typical moment |
|---|---|---|
| Look inside a CSV without Excel mangling it | CSV viewer | Checking an export before a CRM import |
| Break a large file into smaller ones | CSV splitter | A platform rejects files over an upload limit |
| Stack multiple exports into one file | Merge CSV | Combining monthly exports into a year |
| Fix values without opening Excel | CSV editor | Correcting headers or a bad column before re-import |
| Open an .xlsx you don't trust or don't own Excel for | Excel viewer | Reading a spreadsheet on a machine without Office |
| Gauge the mood of open-ended feedback | Sentiment analysis | Triaging survey comments or reviews |
| See which words and phrases dominate a text | Word frequency | First pass over open-ends or support tickets |
Why these run in the browser on purpose
File utilities are exactly the category where uploading is unnecessary risk. Parsing a CSV, splitting it, or counting words requires no server — modern browsers handle files in the hundreds of megabytes locally. So these tools make no network request with your data: what you drop on the page is processed by JavaScript on your own machine, which is why they work on locked-down work laptops and with files you're not allowed to send anywhere.
The workspace is the deliberate exception: real AI analysis needs compute, so there your data is processed in memory by the engine — still never stored, with only reports you explicitly generate being saved. The boundary is explicit: utilities stay local, analysis runs in memory, and nothing persists without your say-so. Details in the privacy policy.
When a utility stops being enough
A viewer answers "what's in this file?"; it can't answer "what changed and why?". The practical escalation point is when you catch yourself doing analysis inside a utility — filtering, eyeballing trends, copying numbers into a doc. That's the moment to move the same file into the workspace, where the engine writes and runs real Python against it and turns the answers into a report with every computation attached. The guides on analyzing CSV data with AI and analyzing Excel data with AI show that workflow end to end.
Need analysis, not just utilities?
The workspace runs verified AI analysis on your files and turns results into shareable reports.
Open the workspace