Compare two lists
To compare two lists, paste them into fields A and B: you see at once what is only in A, only in B or in both – plus the combined list of all entries. Everything runs in your browser.
Source: Unicode Standard Annex #15 – Unicode Normalization Forms (NFC, NFD). Updated: .
How it is calculated
Comparing two lists means forming three sets: what is only in the first, what is only in the second and what is in both. The tool does this in your browser for names, e-mail addresses, article numbers or Excel columns – without formulas and without an upload.
How it works
- Paste list A and list B, ideally straight from Excel or a text file (one entry per line; the tool also detects commas, semicolons and tabs).
- Optionally ignore case and accents and choose the sorting.
- Copy the four result lists: only in A, only in B, in both, all together.
What it is useful for
- Matching participants, members or follower lists: who is new, who is gone, who is in both lists?
- Inventories and price lists: which article numbers are missing from the new list?
- Mailing lists: find duplicate and shared addresses.
Limits
Entries are compared as a whole, not by similarity: “Müller” and “Mueller” are different. Spaces at the start and end do not count; duplicate entries within a list are counted and listed only once.
- Up to 4 million characters together. The tool compares simple entries; for whole tables with several columns it is best to compare column by column.
- The output gives each entry in the spelling in which it first appears (list A before list B).
Privacy
Your lists never leave the browser. Next steps: sort alphabetically, compare texts or clean up text.
Frequently asked questions
How can I compare two lists online?
Paste list A and list B into the fields. The tool shows at once what is only in A, only in B or in both.
How do I find out what is missing from list A but in list B?
That is the result “Only in B”. Likewise “Only in A” shows what is missing from list B.
Can I compare lists from Excel?
Yes. Select the column in Excel, copy it and paste it – each cell is one line. That compares columns without formulas.
Is case distinguished?
Not by default: “anna” and “Anna” count as equal. You can switch the tick off.
What happens to duplicate entries?
Within a list, duplicates are counted and listed only once in the results.
Are my lists uploaded?
No. The comparison runs entirely in your browser.
Sources and legal basis
- Unicode Standard Annex #15 – Unicode Normalization Forms (NFC, NFD)
- MDN – Intl.Collator (numeric, sensitivity)
- Wikipedia – Symmetric difference (Mengenlehre: Differenz, Schnitt, Vereinigung)
As of: · Editorial policy
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