DNS & domain lookup

TXT Record Splitter

Split a long TXT value (like a 2048-bit DKIM key) into valid 255-character DNS strings, formatted as one quoted record. Free, runs in your browser.

Split a long TXT record

Paste a TXT value over 255 characters (like a DKIM key). It is split into valid DNS strings.

What this TXT record splitter does

Splits any value into 255-character DNS strings
Formats them as one quoted, concatenated TXT record
Handles DKIM keys, long SPF and verification data
Shows the character count and number of strings
One-click copy of the ready-to-publish record
Runs entirely in your browser

Common use cases

  1. 1Publishing a 2048-bit DKIM public key
  2. 2Adding a long verification TXT record
  3. 3Fixing a "string too long" DNS error
  4. 4Formatting a value your provider rejected
  5. 5Preparing TXT records for BIND zone files
  6. 6Splitting concatenated policy records

Related tools

DKIM key generatorTXT Record LookupDNS zone file validatorSPF flattenerDNS Record LookupDKIM Record Checker

About the 255-character TXT limit

A single DNS character-string is limited to 255 bytes. Longer values — such as 2048-bit DKIM public keys — must be published as multiple quoted strings within one TXT record, which resolvers concatenate back together. Getting this wrong causes "string too long" errors or broken DKIM.

This tool splits your value at 255 characters and wraps each piece in quotes, giving you a record you can paste directly. It runs locally in your browser.

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HostCloud.in  ·  Pune, India  ·  Serving 34,987+ Websites Since 2020

FREQUENTLY ASKED QUESTIONS

Got Questions? We Have Answers.

Why do TXT records need splitting?

A single DNS character-string is limited to 255 bytes. Longer values must be published as multiple quoted strings within one TXT record, which resolvers join back together.

What is this most used for?

Publishing 2048-bit DKIM public keys, long SPF records, and lengthy domain-verification tokens that exceed 255 characters.

How do I publish the split record?

Paste the whole quoted, space-separated output as a single TXT record. Most providers accept it as-is; some ask for the value without quotes.

Does splitting change the value?

No. Resolvers concatenate the strings back into the original value, so the meaning is unchanged — it is only a DNS formatting requirement.

What if my value is under 255 characters?

It does not need splitting. The tool still shows the valid single quoted form for convenience.

Is my value uploaded?

No. Splitting happens entirely in your browser.