Private CSV Deduplicator

Duplicates, gone.

One click. Clean data.

Drop a CSV file here or browse

Or paste CSV data:
No upload
Works offline
No tracking

Need to deduplicate large CSV files? The offline bundle handles any file size without internet. $49 once.

Get Bundle →
// How it works

Three steps. Zero uploads.

01
Drop
Drop your CSV file into fwip.
02
Deduplicate
Duplicate rows are identified and removed instantly. Choose which columns to match on.
03
Download
Download the cleaned CSV with duplicates removed.
// Why this is different

Clean your data without sharing it.

Most CSV tools upload your file to process it. That means your customer data, email lists, and business records pass through someone else's servers. fwip deduplicates entirely in your browser. Your data stays on your device.

fwip works differently. The processing engine runs entirely in your browser. Your CSV is read from your device, processed on your CPU, and the result is saved back to your device. No server is involved. We literally cannot see your file.

No server processing

Everything runs on your device using WebAssembly. Your file never touches a network.

No account required

Drop a file. Get a result. No sign-up, no email, no password.

No subscription

Free in the browser. $99 once for the offline bundle. That's it. Forever.

Works offline

The desktop version works with no internet connection at all.

Use it free in your browser. Own it offline for $15. No subscription. Your data stays yours.
// How fwip compares

fwip vs the rest.

fwipRemoveDuplicates.comGoogle SheetsExcel
Upload requiredNoYesYes (cloud)No (desktop)
Account requiredNoNoYesNo (one-time)
Price$15 / toolFree (ad-supported)Free$160/yr (Microsoft 365)
Files leave deviceNeverYesYes — Google serversNo (local)
Works offlineYesNoPartialYes
Batch processingOffline bundleNoManualYes
// Questions

Frequently asked.

How do I remove duplicate rows from a CSV?▾
Drop your CSV file into fwip. Select which columns to match on (or match on all columns). Duplicates are removed instantly. Download the cleaned file.
Can I choose which columns to match?▾
Yes. Match on specific columns like email address, customer ID, or product SKU — so rows that differ in other columns but share the same key value are treated as duplicates.
Is my CSV data uploaded?▾
No. The entire deduplication runs in your browser. Your data never leaves your device. This is especially important for customer lists, financial data, and PII.
How large a file can it handle?▾
The free web version handles files up to 100MB. The offline version has no file size limit.
Does it preserve column order and headers?▾
Yes. Column order, headers, and data formatting are preserved. Only duplicate rows are removed.
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