Paste a large list of email addresses and a batch size, and get the list automatically split into numbered, copy-ready batches — handy for staying under a provider's daily sending limit or a manual BCC recipient cap.
Most email providers cap how many recipients you can include in a single message, and separately, many also cap how many total messages or recipients you can send across an entire day — Gmail's personal accounts, for instance, generally allow up to 500 recipients per message and cap total daily sending volume, while Google Workspace accounts have higher but still finite limits. Sending in smaller batches, spaced out, keeps you under both kinds of caps and reduces the chance of a send being throttled or blocked entirely.
This tool takes your full list and your chosen batch size, then divides it into clearly numbered groups, each shown in its own copyable text box — so you can work through sending each batch in turn, whether that's pasting into a BCC field, a CRM import, or a sending platform that processes lists in chunks.
The right batch size depends on where you're sending from and what limit you're working around — checking your specific provider's current recipient-per-message and daily sending limits (which do change over time) before choosing a number is worth doing, since the safest batch size for a personal Gmail account is very different from what a dedicated email service provider can typically handle in one go. As a starting point, smaller batches in the range of a few dozen to a couple hundred addresses tend to be a reasonably safe default for personal or small-business accounts, while dedicated sending platforms are generally built to handle much larger volumes reliably.
It depends entirely on where you're sending from — check your specific provider's current published limits, since consumer webmail accounts typically allow far fewer recipients per message and per day than a dedicated email service provider or business email plan.
No — it only splits the list you paste into groups. Keeping track of which batches you've sent and when (to respect daily limits) is left to you or your sending platform.
This tool treats each line, comma, or semicolon-separated entry as a single item, so it works best with a plain list of addresses. For a list with extra columns, use the Email Extractor first to pull out just the addresses.
It can help avoid hitting rate limits that trigger throttling, but it doesn't address other spam signals like message content or sender reputation — those are separate concerns covered by tools like the Spam Score Checker.
No hard limit is enforced by the tool itself — since everything runs locally in your browser, practical limits depend on your device, but lists of several thousand addresses split almost instantly.