Dedupe.dev vs the built-ins

Use the built-ins first: Data → Remove Duplicates in Excel and Data cleanup in Google Sheets remove exact duplicates in place, free, no new tool. Reach past them when the duplicates are not exact (case, punctuation, reordered names), when you want a cleaned copy instead of an edited original, or when the job repeats often enough to automate.

What the built-ins do

Both spreadsheets ship real dedupe. Excel removes rows that match exactly on the columns you tick, keeping the first occurrence; Sheets does the same via Data cleanup, case-insensitively. In place, no export, no account. Our Excel guides and Sheets guide lead with these methods on purpose: for exact duplicates in a file you have open, nothing beats five clicks you already own.

Where they stop

Three walls. Exactness: an extra space, a different case (in Excel), or "Smith, Jane" vs "jane smith" is not a duplicate to either; catching those takes normalization the built-ins do not have, which is what fuzzy matching over the API is for. In-place editing: both modify the original with undo as the safety net, where the browser tools hand back a cleaned copy and never touch the source file. Repetition: the built-ins are manual by nature; the fiftieth weekly cleanup wants a script or a no-code flow, not a keyboard shortcut ritual. If none of those walls is in front of you, keep using the built-ins and keep your money.

How Dedupe.dev works, for contrast

Two halves. The browser tools are free and unmetered: your file is parsed and deduplicated by JavaScript in the tab, nothing is uploaded, and you can watch the empty Network panel while it runs. The HTTP API is for automation: exact or fuzzy matching, metered in rows (1,000 a month free with a key, 100,000 on Starter at $19/mo, 300,000 on Pro at $49/mo), with fuzzy requests up to 50,000 rows each. Duplicates are removed, never merged: the first occurrence survives, and re-importing the cleaned file is your step.

FAQ

Frequently asked questions

When are the built-ins enough?

Often. Exact duplicates in a sheet you already have open: Excel's Data → Remove Duplicates or Sheets' Data cleanup do it in five clicks, in place, free. Start there; our own Excel and Sheets guides say the same.

What do the built-ins miss?

Anything that is not byte-identical after trimming: "ACME" vs "acme" in Excel (Sheets' cleanup is case-insensitive), "Smith, Jane" vs "jane smith" everywhere, and both edit your data in place with undo as the only rollback.

Do I need the API for this?

Not for a file on your desk; the browser tools are the right tool and they are free. The API exists for the recurring version: the same cleanup running nightly against exports without anyone opening a spreadsheet.

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