Fix your CSV before it
breaks your import
Encoding errors, duplicate rows, wrong delimiter, missing headers — upload your file and CSViser finds every problem and fixes it in one click.
Features
Validate
Strict RFC 4180 validation — errors, warnings, and info messages with plain-English explanations. Know exactly what's wrong and why.
Fix common issues
One-click fixes for encoding (UTF-8, BOM, Windows-1251), mixed line endings, blank rows, extra whitespace, and inconsistent null values.
Deduplicate
Remove exact duplicate rows or use fuzzy matching to catch near-duplicates — typos, name variations, formatting differences.
Convert columns
Normalize dates, numbers, currencies, emails, phone numbers, and URLs. Auto-detects input format, converts to your chosen output.
Reshape and transform
Sort, filter rows, split columns, normalize headers, anonymize PII, split into multiple files, or merge two files by key column.
Export anywhere
Download as CSV, Excel (XLSX), JSON, or Markdown table. Upload XLSX and we convert it automatically on the way in.
Built for developers too
Process CSV files programmatically with a single HTTP request — no UI required. The same cleaning pipeline as the UI: fix encoding, remove duplicates, normalize columns, export as CSV, XLSX, or JSON.
Files are processed entirely in memory and never stored on our servers. Authenticate with an API key from your Account settings.
curl -X POST https://csviser.com/api/v1/process \
-H "Authorization: Bearer csviser_xxx" \
-F "[email protected]" \
-F "fix[]=blank_rows" \
-F "fix[]=trim" \
-F "fix[]=nulls" \
-F "dedup=1" \
-F "output_format=xlsx" \
-o cleaned.xlsxHow it works
Upload your file
CSV or XLSX, up to any size. Delimiter and encoding are detected automatically.
Review results
See validation errors, a column-by-column profile, and a summary of fixable issues.
Fix and download
Apply fixes, convert columns, reshape — then export in your preferred format.
Your files are private and secure
Encrypted storage
Files are stored on Cloudflare R2 infrastructure with encryption at rest. No one outside your account can access them.
Automatically deleted
All uploaded files are automatically and permanently deleted after 24 hours. Via the API, files are processed in memory and never stored at all.
Delete anytime
Don't want to wait? Delete any file immediately from your dashboard with a single click. Deletion is instant and irreversible.
Never shared or used
We never read, analyze, or share your file contents with third parties. Your data is yours — we only process it to apply the fixes you request.
Simple pricing
Start for free. Upgrade when you need more.
- Files up to 500 rows
- All 14 tools included
- Export to XLSX, JSON, Markdown
- Unlimited file size
- All 14 tools included
- No upload limits
- Cancel anytime