MLS listing description character limits explained

Where does the 4,000 character figure actually come from?

It comes from RESO, the Real Estate Standards Organization, which maintains the Data Dictionary that most MLS software is built against. The Data Dictionary defines PublicRemarks as "text remarks that may be displayed to the public" and states a suggested maximum length of 4,000 characters for the field. RESO writes standards for interoperability between systems, not enforceable rules for brokers, so the 4,000 figure functions as a common denominator that lets data flow between an MLS, an IDX feed and a portal without one system's field silently truncating what another system allowed. It is the number a RESO certified system is built to accommodate, not a number every MLS chooses to expose to its members at full length.

Individual MLSs then decide independently whether to allow the full 4,000, cap it lower in their own system configuration, or leave it uncapped in the interface while their database column enforces a hard limit somewhere behind the scenes. None of that configuration decision is required to appear in the public rulebook, and in the two rulebooks checked directly for this guide, it does not.

What do the actual MLS rulebooks say, word for word?

Less than agents assume. CRMLS Rule 12.5, Misuse of Public Remarks, states that information in the field "shall only relate to the description, features and condition of the property and related amenities," and lists categories of content that may not appear, contact information, branded content, showing instructions, occupancy status and compensation references among them. Nowhere in that rule, or anywhere else in the CRMLS rulebook reviewed for this guide, is a specific character count stated. The rule governs content, not length.

ARMLS Rule 11.6, Information in Public Remarks, reads the same way: it restricts remarks to the physical traits of the property, its location and the transaction preferences attached to it, again as a content rule rather than a length rule. Neither association publishes a number in the document a member would actually read to find one. That gap is very likely why online answers disagree so completely: someone quoting "1,000 characters" and someone else quoting "4,000 characters" for the same MLS are not contradicting a stated rule, because there generally is not one in the rulebook to quote. They are each describing what they encountered in their own MLS's input software, which can differ by vendor, by region, and by whenever the system was last reconfigured.

Source	States a numeric limit?	What it actually governs
RESO Data Dictionary, PublicRemarks	Yes, 4,000 characters, stated as a suggested maximum	A data interoperability standard for the field, not an enforcement rule
CRMLS Rule 12.5	No	Content restrictions: what may and may not appear in the field
ARMLS Rule 11.6	No	Content restrictions: physical traits, location, transaction preferences
Your MLS's input software	Usually yes, but rarely published	The actual character count you can type before the field stops accepting input

So how do I find the real number for my own MLS?

Test it directly rather than trusting a number from a forum post or an old training slide. Paste a long paragraph, ideally over 4,000 characters, into the field in your MLS input system and watch where it stops accepting characters or where it silently truncates on save. That single test is more reliable than any published figure, because it reflects the system you are actually entering data into today rather than a number that may have changed the last time the MLS upgraded its platform. If your MLS runs on a well known vendor system, its own help desk or training team can usually confirm the configured limit directly, and that answer is worth writing down somewhere you will find it again, since it rarely appears in the rulebook itself.

The consequence of guessing wrong is not a rejected listing. It is a silently clipped one. A description that exceeds the field's real limit does not usually throw an error, it saves whatever fits and drops the rest, which means the sentence that gets cut is whichever one you happened to write last. That is the strongest argument for writing to a conservative length regardless of what the theoretical ceiling might be: put your strongest, most differentiating fact first, as covered in full in how to write an MLS listing description, and treat anything past roughly the first 1,000 characters as a bonus a reader may never see rather than a guaranteed part of the record.

Does the limit follow the description once it leaves the MLS?

Not reliably. A syndication feed carries the PublicRemarks field as data, and the receiving portal applies its own display rules on top, which can mean a description that fit cleanly inside your MLS's field gets truncated a second time on the portal side, or displayed in full behind a show more control regardless of length. Two listings with an identical remarks field can render differently on the same portal if one MLS transmits the field with formatting characters the portal strips and the other does not. None of that is visible from inside your MLS input screen, which only ever shows you your own system's behaviour, not what a consumer eventually sees three systems downstream. How listings reach Zillow and Realtor.com covers the feed path in full, and it is the reason a description that reads correctly in your MLS is worth spot checking on the actual portal page after it goes live, rather than assumed to have travelled unchanged.

Does the character limit interact with anything else that changed recently?

Yes, indirectly, through the compensation changes that took effect on 17 August 2024. Before that date, some public remarks fields carried a sentence about buyer broker compensation, which used part of whatever character budget the field allowed. Since the practice changes following the Sitzer/Burnett settlement, no offer of compensation may appear anywhere in the MLS, remarks included, which frees up length that a description could previously lose to a sentence that no longer belongs there at all. An agent still writing to old habits, leaving space for a compensation line that current rules forbid, is wasting characters on a sentence that should not exist rather than on the property.

The same field also interacts with the accuracy and content obligations covered in what an MLS actually checks before it publishes a listing, because a description that is accurate but truncated at an unpredictable point can end up implying something the full sentence would not have. A number, a date or a caveat cut off mid clause reads differently to a buyer than the same fact stated in full, which is one more reason the safe approach is writing tight rather than writing to the assumed ceiling.

Frequently asked questions

Is 4,000 characters the limit at every MLS?

No. It is RESO's suggested maximum for the PublicRemarks field as a data standard, and individual MLSs are free to configure their own systems at, below, or in rare cases above that figure. Check your own MLS's input system directly rather than assuming the RESO number applies to you.

Why do different websites give different numbers for the same MLS?

Because the number usually is not published in the rulebook, so most sources are reporting what someone personally encountered in the input software at some point, which can shift when a system is upgraded or reconfigured. Treat any specific figure you read online as a starting point to verify, not a citable rule.

What happens if my description is longer than the field allows?

Most systems either refuse to save the excess or truncate it silently at whatever character the limit falls on, cutting off mid word or mid sentence. Neither CRMLS nor ARMLS's public rulebook describes a warning step for this specifically, so the safest habit is testing your own system's ceiling rather than discovering it on a live listing.

Should I write right up to the limit to include everything?

No. A reader on a phone typically sees only the first few lines before a show more control, so length past that point does little for a human reader even when the system accepts it. Front load the property's strongest fact and treat extra length as insurance against nothing, not as content most buyers will actually reach.

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Last verified: 2026-09-02