Sylvaera / CSV Data Cleaner
AI-POWERED · INSTANT · FREE

Free CSV Data Cleaner
Online

Upload any messy CSV or JSON — AI automatically detects and fixes nulls duplicates type mismatches date formats and whitespace. Download clean data in one click. Free no sign-up.

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Key features

Built for real workflows

🕳️
Fix Null Values
Detects missing and empty fields. Fills with sensible defaults — 0 for numbers, 'unknown' for strings.
👥
Remove Duplicates
Identifies and removes identical rows automatically, keeping the first occurrence of each.
📅
Fix Date Formats
Standardises mixed date formats to ISO 8601. Fixes phone formats to E.164. Lowercases emails.
🔤
Fix Type Mismatches
Fixes numbers stored as text, dates stored as numbers, booleans stored as strings.
How it works

Three steps, instant results

1
Upload or paste your data — supports CSV, JSON and plain text. Paste directly or upload a file from your computer.
2
Configure your options — select strategies, output format and any custom preferences from the clean interface.
3
Download your results — get processed data as CSV, JSON or Excel instantly. No waiting, no email required.
FAQ

Common questions

How do I clean a CSV file online for free?

Upload your CSV to sylvaera.com/app and open the CSV Cleaner. AI detects all issues and fixes them automatically. Download as CSV, JSON or Excel.

Can it remove duplicate rows?

Yes. Automatically detects and removes duplicate rows, keeping the first occurrence of each.

Does it fix null values automatically?

Yes. Null and empty fields are filled with sensible defaults — 0 for numbers, 'unknown' for text, ISO dates for date columns.

Is this tool completely free?

Yes. No sign-up, no credit card, no usage limits for standard datasets. 100% free. All 7 Sylvaera tools are free.

Is my data safe?

Sylvaera does not store any uploaded data. All processing happens in-memory and is discarded immediately after your session ends.

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