Disk-backed past 50K rows
Sheets above 50,000 rows are spilled to a SQLite-backed store instead of being held entirely in memory, keeping the grid and filters responsive.
All use cases
Open large CSVs without the spinning beachball.
Big exports make spreadsheet apps crawl: Numbers truncates, Excel stalls, and online viewers want you to upload customer data to someone else's server. CSV Power Editor opens large CSV files in a responsive grid on your Mac, spills big sheets to a disk-backed store, and keeps filtering and search fast.
How to
Work a big file in four steps.
- 1
Open the file
Drag the CSV onto CSV Power Editor. Encoding and delimiter are auto-detected, and sheets above 50,000 rows automatically use a SQLite-backed store to stay responsive.
- 2
Find the rows that matter
Build multi-column filters with live counts — contains, equals, regex, blank, and more — and watch the visible row count update as you type.
- 3
Edit and clean in place
Edit cells directly, run Find & Replace with regex support, trim spaces, fix dates, dedupe — every operation has a preview and undo.
- 4
Export the slice you need
Use Save Filtered to write only the visible rows to a new file, or Save As to write the whole cleaned dataset as CSV or XLSX.
Why it works
Built for files that break spreadsheets.
Tested with 75K-row files
The large-file path is verified with 75,000-row samples — real exports, not toy fixtures.
Filters that scale
Excel-style filter chips with eight operators update live as you type, so isolating a segment in a big export takes seconds, not a formula.
Local means private and fast
No upload step, no file-size limits from a web service, no customer data leaving your Mac. The file opens as fast as your disk reads it.
FAQ
Common questions.
How large a CSV can it handle?
The app is tested with 75,000-row files. Sheets above 50,000 rows automatically switch to a disk-backed SQLite store so the grid, filters, and search stay responsive.
Why not just use Excel or Numbers?
Numbers truncates very large tables and Excel often stalls on big CSVs, especially with filters applied. A purpose-built grid with disk-backed storage stays interactive, and you don't need either app installed.
Can I export just a filtered subset of a big file?
Yes. Apply filters, then Save Filtered writes only the visible rows to a new CSV — the fastest way to carve a working set out of a huge export.
Does the free version open large files?
The 14-day full Pro trial includes large files, so you can test with your real exports. After the trial, free mode is limited to 300 rows and the one-time $14.99 Lifetime Pro unlock restores large-file support.
Is my data uploaded anywhere?
No. Everything runs locally on your Mac. The app makes no outbound network connections — there is nothing to upload to.
Keep going
Related guides.
Convert CSV to Excel (XLSX) on Mac
Open any CSV — semicolon, tab, or odd encoding — and save it as a clean Excel workbook.
Remove Duplicates from CSV Files
Find exact and fuzzy duplicate rows by key columns, preview what gets removed, then apply with undo.
Compare Two CSV Files on Mac
Get a reviewable compare workbook with matched keys, changed columns, and missing rows.