CSV lead cleaner — verify, dedupe and clean in one upload
Upload a messy CSV and get back a clean lead list: emails verified, phones validated, duplicates removed, and every row quality-scored. BounceBlock auto-detects your columns, so any export works. Preview your first 100 rows free.
What a clean lead list actually means
A raw lead export is a mix: real, reachable people alongside dead inboxes, disconnected numbers, typo'd addresses, disposable domains, and the same contact entered three times. "Cleaning" it means separating the leads worth working from the noise — and doing it before you spend a rep's time or a send's reputation on the bad rows.
BounceBlock cleans a CSV across every dimension that matters in one pass: it verifies each email for deliverability, validates each phone for line type and status, removes duplicates across both fields, and scores each row so you can see the health of the whole file at a glance. What comes back is a list you can import or send with confidence.
What gets cleaned
Automatic column detection
Every list arrives in a different shape — different column names, different order, extra fields you don't need. BounceBlock auto-detects the email, phone and name columns on upload, so there's no template to match and no mapping step to get wrong. A raw CRM export, a purchased list, or an event scan all just work.
Your other columns come along for the ride untouched, so the clean file you download keeps the context your team needs — company, source, notes — alongside the verified, deduplicated contact data.
How the quality score works
Instead of a blunt valid/invalid split, each row gets a score that reflects everything we found: whether the email is deliverable or risky, whether the phone is a live mobile or a dead line, and whether the record is unique. That lets you make a judgement call rather than a binary one — send to the high-scoring rows now, hold the medium ones for a warm-up segment, and drop the bottom.
The score also gives you a single number for the health of the whole list, so you can see at a glance whether a source is worth buying from again.
A two-pass cleaning workflow
For a quick, private tidy-up of a few hundred addresses, the browser-based email list cleaner dedupes and flags syntax and role/disposable issues without anything leaving your browser. It's the fast first pass.
For the real clean — confirming which mailboxes are actually live, validating phones, and scoring the whole file — upload the CSV here. This is the pass that catches the well-formed addresses that no longer deliver and the numbers that no longer connect, which a browser check can't see. Run the quick pass first and the full pass second and you get the cleanest possible file for the least effort.
Who uses it
Ready to see what’s hiding in your list?
Upload a file and preview your first 100 verifications free — email and phone, in one pass.
Frequently asked
What does the CSV lead cleaner do?
It takes a raw CSV and returns a clean lead list — emails verified for deliverability, phones validated for line type and status, duplicates removed across both fields, and every row quality-scored. It auto-detects your columns, so any export works.
Do I need to format my file first?
No. Upload any CSV and we auto-detect the email, phone and name columns. Your other columns are preserved untouched in the clean file you download.
Does it remove duplicates too?
Yes — deduplication runs in the same pass as verification, matching the same person across email and phone even when they were entered differently.
How is this different from the free email list cleaner tool?
The browser tool is a fast, private first pass for a few hundred addresses (dedupe + syntax + role/disposable flags). The CSV lead cleaner does the full pass: live mailbox verification, phone validation, and scoring on the whole file.
Can I try it before paying?
Yes — preview your first 100 rows free, no credit card, so you see exactly how many bad and duplicate rows are in your list before unlocking the full clean file.
Is my data safe?
Your file is encrypted, processed, and deleted on a fixed retention schedule. Verification is the only thing we do with your contacts — we never sell or share them.
Stop wasting hours on dead leads.
Upload your list and see how clean it really is — free, in under two minutes.