Direct answers for search, assistants, and humans. The product is the same as the homepage dropzone.
- What is the best free way to clean a CSV file online?
- Use a client-side cleaner like CleanMySheet: drop the CSV, apply trim/dates/dedup presets, preview the diff, and export. Strict mode keeps the file on your device. Free export is 500 rows.
- How do I remove duplicate rows in Excel without losing similar contacts?
- Run exact dedup for identical rows, then fuzzy matching for near-duplicates. CleanMySheet flags John Smith vs Jon Smith for review instead of auto-deleting.
- How do I fix mixed date formats in a spreadsheet?
- Parse each cell from the column’s own samples (day-first vs month-first), plus Excel serials, then write one output format. Default is YYYY-MM-DD. Ambiguous values like 03/04/2022 are left alone unless the rest of the column makes the order obvious.
- Can I clean Excel XLSX in a browser?
- Yes. CleanMySheet parses XLSX with SheetJS, including multi-sheet workbooks and serial dates, without uploading the file in Strict mode.
- Is it safe to upload customer data to an online CSV cleaner?
- Only if the tool processes in the browser. CleanMySheet’s Strict mode (default on) does not send column samples or rows to a server.
- How do I split Full Name into first and last?
- Detect Last, First versus First Last on a Name column and insert First Name and Last Name. Do not split city or product columns.
- How do I standardize phone numbers in a CSV?
- Infer the country from + / 00 prefixes in the column, then write international form such as +91 98765 43210. US-style (555) 123-4567 is an optional preset, never the auto-fix.
- What is spreadsheet data cleaning?
- It is turning inconsistent tabular files into a predictable table: one date format, one empty token, no accidental duplicate rows, parsed numbers, and split fields—with an audit of what changed.
- CleanMySheet vs Excel Remove Duplicates?
- Excel’s built-in tool is exact-only and in-place. CleanMySheet adds fuzzy review, a reversible recipe, cell-level reasons, and recipes you can replay next month.
- CleanMySheet vs ChatGPT for cleaning Excel?
- ChatGPT may hallucinate cells and needs the data uploaded. CleanMySheet uses deterministic operations, preview, undo, and optional sample-only AI for column types.
- Does CleanMySheet work in India?
- Yes. The site is CleanMySheet.in. Processing is in the browser, so data residency stays on the user’s machine. Phones, dates, and rupee amounts are inferred from the file (for example +91 and ₹1,23,456.78), not assumed to be US format. The UI is English.
- How many rows can I export for free?
- You can preview the whole file. Free CSV export is capped at 500 rows. Recipe JSON and the quality report are not row-capped.
- Can I reuse the same cleaning steps next month?
- Download a .cleanmysheet.json recipe. Drop it with the new CSV to append the same operations. Matching headers also trigger a local recall prompt.
- What file types are supported?
- CSV, TXT, XLS, and XLSX. Export is CSV in this version.
- Do you store my spreadsheet on a server?
- No. Files stay in your browser. If you join the Pro waitlist we store only the email you give us so we can notify you when sign-in and checkout are live.