Email Bounce Code Checker
Tell a hard bounce from a soft one, and from a block.
Email List Splitter
Cut a big list into batches your platform will accept.
Drop a .csv or .txt list here, or click to choose
Leave this off for an import limit. Switch it on for an A/B test — an in-order split of a list sorted by signup date is not a test.
Quick Tool Overview
The Email List Splitter cuts a large list into batches by size or by count, in order for an import limit or shuffled for an A/B test, with each batch ready to copy or download on its own.
- What it does
- Splits a large email list into smaller batches
- You give it
- A list, and a batch size or a number of batches
- You get back
- Numbered batches, each copyable and downloadable
- Order
- In order for imports, shuffled for A/B tests
- Best for
- Import limits, send throttling and split tests
About the Email List Splitter
Import limits, send throttles and A/B tests all need the same thing: a big list cut into smaller ones. This does it by batch size or by number of batches, whichever you know.
Splitting in order is the default and right for an import limit. For an A/B test you want the shuffle option instead, which distributes the list randomly so the batches are comparable — an in-order split of a list sorted by signup date puts your oldest subscribers in batch one and your newest in the last, which is not a test.
Each batch is shown with its size and can be copied or downloaded on its own, or all of them at once as numbered files.
Key features of the Email List Splitter
Split either way
By addresses per batch, or by number of batches.
Cryptographic shuffle
Fisher-Yates from the browser random source, for real A/B splits.
Even remainders
Leftovers spread across batches, not dumped in a tiny last one.
Download all at once
Numbered files, or one batch at a time.
Reads a file from disk
Drop a .txt or .csv — nothing is uploaded.
How to use the Email List Splitter
-
1
Paste the full list
Or drop a .txt or .csv from your own disk.
-
2
Choose how to split
By addresses per batch, or by number of batches.
-
3
Shuffle if it is a test
Random distribution for an A/B split, in-order for an import.
-
4
Download the batches
One at a time, or all of them as numbered files.
Frequently asked questions
Usually an import limit — many platforms cap a single upload at 10,000 or 50,000 rows. Warming a new sending domain and running an A/B test are the other two common reasons.
For an A/B test, yes, always. Exports are usually ordered by signup date, so an in-order split compares your oldest subscribers against your newest rather than comparing your two variants.
It is a Fisher-Yates shuffle drawing from the browser cryptographic random source, so every ordering is equally likely.
When the list does not divide evenly, the remaining addresses are spread across the earlier batches rather than left in a tiny final one.
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