Drop your CSV, .txt, .xls or multi-tab .xlsx file below. We immediately count unique emails, strip duplicates for $0, verify a live 5-email sample via Smart SMTP, and let you unlock the full clean list from $19.
Drag & drop your file (or click Simulate 250-Email B2B List) for an instant 0-credit pre-scan + 5-email live Smart SMTP test.
Unlike legacy bulk email verifiers that force you to convert Excel spreadsheets into flat CSV files, KaijuVerifier parses .xls, .xlsx, .csv and .txt files directly. Upload multi-tab Excel workbooks and keep every tab intact while automatically scrubbing invalid, disposable, and catch-all addresses.
Whether you are verifying 100 emails for free, cleaning 5,000 leads for a $19 one-time credit pack, or verifying 50,000+ emails/month for $49, our parallel 7-Layer Smart SMTP & MX engine delivers 98.5%+ accuracy. Compare KaijuVerifier vs ZeroBounce, NeverBounce, Bouncer & MillionVerifier →
Traditional bulk email verifiers force marketing operations teams to export each Excel worksheet tab as a separate UTF-8 CSV file, strip formatting, upload files one by one, and manually VLOOKUP status columns back into their master workbook. The KaijuVerifier Bulk Cleaner eliminates that workflow friction with native multi-sheet .XLSX, .XLS, .CSV, and .TXT parsing.
Before consuming a single verification credit, our browser-side pre-scanner hashes every email address across all worksheet tabs, strips exact and canonical duplicates (including Gmail dot and +tag aliases) at $0 cost, flags obvious RFC 5322 syntax errors, and offers a live 5-email Smart SMTP sample check. Once unlocked, our parallel asynchronous worker pool processes 100,000+ rows per hour with automatic anti-greylisting retries.
| Bulk Cleaner Pipeline Stage | Execution Environment | Credit Cost & Data Hygiene Impact |
|---|---|---|
| Stage 1: Multi-Tab .XLSX / CSV Ingestion | Client-Side Browser WebWorker (SheetJS) | $0 · Auto-detects email columns across all workbook sheets |
| Stage 2: Cross-Sheet Deduplication & Syntax | In-Memory Canonical Hash Set | $0 · Removes duplicate rows & malformed syntax before billing |
| Stage 3: 7-Layer Smart SMTP & Catch-All Pool | 7 Global Distributed MTA Probe Clusters | 1 Credit per Valid/Invalid · $0 for Unknown/Greylisted |
| Stage 4: Segmented Workbook Export | Instant Download (Valid, Safe, Catch-All, Invalid) | $0 · Ready for 1-click import into HubSpot, Klaviyo or Instantly |