CSV editor — fix values without Excel
Open a CSV in an editable grid, correct the cells that need fixing, and download the cleaned file. No Excel, no upload, no reformatting surprises.
Click to upload or drag and drop
Drop your CSV, Excel, or JSON file
Max 10MB
Runs 100% in your browser — this page makes no network request with your data.
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Drop your CSV — it opens as an editable grid (first 500 rows editable).
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Click any cell to edit; values stay exactly as typed (no date/zero mangling).
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Download the edited CSV, or send it straight to analysis.
Worked example: fixing product SKUs before a catalog import
An ecommerce catalog manager receives a supplier price list as a CSV where a handful of SKUs are wrong and several product codes have leading zeros. Opening it in Excel is the usual trap: it strips the zeros and turns long codes into scientific notation the moment the file opens.
Instead they load the CSV into the editor, which shows it as an editable grid and treats every value as text exactly as typed. They click into the wrong cells, correct the SKUs, fix a couple of misspelled product names, and leave the zero-padded codes untouched and intact. Then they download the cleaned file.
Because the first 500 rows are editable in the grid, this quick-fix workflow suits targeted corrections rather than bulk transformations. For a rules-based change across every row, say prefixing all SKUs, they can send the file to the workspace instead, then turn the cleaned data into a report.
Frequently Asked Questions
Everything you need to know about using AnalyzeData.
Excel silently reformats data on open — stripping leading zeros, converting IDs to scientific notation, rewriting dates. This editor treats every value as text you typed, so the file round-trips faithfully.
Files of any size open; the first 500 rows are editable in the grid (a browser-performance boundary we state rather than hide). For bulk transformations, the analysis workspace is the better tool.
No — editing happens in memory in your browser, and the download is generated locally.
Edit the file here rather than in Excel. This editor treats every cell as the text you typed, so zip codes like 01730, zero-padded SKUs, and long numeric IDs stay exactly as they are instead of being stripped or converted to scientific notation. When you download, the file round-trips faithfully; the values you saw are the values you get.
Yes. The grid opens in your browser and applies no automatic formatting, so dates, currencies, and IDs are left as-typed and nothing gets silently rewritten on open or save. It works the same on Windows, Mac, or a Chromebook without installing anything, and the file is edited in memory and never uploaded while you work.
When a table isn't enough
The workspace runs verified AI analysis on the same file and turns the results into a report you can send.
Analyze this data instead