That message means your file has more rows than Excel can hold, so it loaded the first 1,048,576 rows and quietly dropped the rest. Your data isn't lost — you just need a tool with no row limit. Gridzu opens the whole file, every row, on your own PC.
An Excel worksheet has a hard ceiling: 1,048,576 rows and 16,384 columns. When you open a CSV or text file that's bigger than that, Excel doesn't refuse — it loads what fits and stops. Every row past row 1,048,576 (or every column past the 16,384th) is silently cut off. The "File not loaded completely" warning is Excel admitting it only showed you part of your data. This is a known trap that catches anyone working with large exports, and it's the same wall people hit as the Excel row limit or when a CSV is too big for Excel.
No — take a breath. Your source file is completely intact. Excel didn't delete or alter anything on disk; it just couldn't display the whole thing. Those missing rows are still sitting in the original CSV, exactly where they were. The moment you open the same file in a tool that has no row limit, every row reappears. The one thing to avoid is clicking Save in Excel after the truncated load — a Save would write back only the rows Excel kept, and that would turn a display limit into real data loss. So close it without saving, and open the file somewhere with no cap instead.
Gridzu runs a fast native data engine designed for large tables, with no row limit. Files with millions of rows open smoothly, and you see the true row count — not Excel's clipped version. Scroll, sort, filter, and clean the entire file without the spinning cursor. Everything runs locally, so your data is never sent to our servers. If you're looking for something to use instead of Excel for jobs like this, Gridzu doubles as a free Excel alternative, and it's just as happy to open large CSV files of any size.
Your file is opened and processed entirely on your computer. Gridzu never sends your data to our servers — the only thing our service stores is the email you sign in with.
It means your file is bigger than an Excel worksheet can hold. Excel caps out at 1,048,576 rows and 16,384 columns, so when a CSV or text file has more than that, Excel loads only the first 1,048,576 rows and silently drops everything past that point. You're seeing part of your data, not all of it — the warning is Excel telling you it gave up before the end of the file.
Use a tool with no row limit. Gridzu uses a native data engine built for large tables, so it opens files with millions of rows — well beyond Excel's 1,048,576-row cap — and shows you the true row count. Download Gridzu free for Windows, drag your CSV in, and every row is there.
No. Your original CSV or text file is intact — Excel didn't change it, it just couldn't display all of it. The rows past 1,048,576 are still in the file on disk. Open the same file in a tool with no row limit, like Gridzu, and everything reappears. Just be careful not to save over the file from Excel, because a Save would write back only the rows Excel loaded.
Yes. Gridzu is free to download and use on Windows and macOS.
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