The short version: send one MP4, in landscape, with every trace of you removed from it, and keep it under your MLS's byte cap. NorthstarMLS, to take one that publishes its spec plainly, accepts one MP4, MOV or AVI video per listing at a maximum of 300MB, plus one additional URL for a video or virtual tour, and says the upload tool is "optimized for landscape video at this time." There is no national video spec. Every MLS writes its own, and the part that gets listings cited is almost never the container format.
Agents lose videos at the upload screen for two different reasons, and only one of them is technical. The file either does not meet the format and size rules, which is a thirty second fix, or the content of the video breaks a branding or accuracy rule, which can be a fine. The second category is where the money is.
The technical specs, and why nobody can quote you one number
MLSs run on different platforms and set their own media limits, so "the MLS requirements" is not a single document. What follows is what the published ones actually say.
Container format
MP4 is the format to standardize on. NorthstarMLS states that "Subscribers may upload one (1) MP4, MOV or AVI video per listing," and MP4 is the only one of those three that is universally safe across other systems, phones and social platforms. If a system accepts MOV or AVI it will accept MP4. The reverse is not reliably true, and an AVI file is the one most likely to be rejected by a newer upload tool or play back badly for a buyer on a phone.
File size
NorthstarMLS caps uploads at 300MB. That is a byte limit, not a length limit, which is the distinction agents get wrong. A long, gently moving video at a modest bitrate can come in smaller than a short, grainy, high bitrate one. Resolution is the lever that moves file size fastest, so a 4K copy of the same video can be several times the size of the standard one and is the version most likely to bounce off a cap.
Photo limits are published more widely than video limits and give you a sense of the range. The MLS of Southern Arizona documents a 15MB ceiling per saved photo and a maximum of 3000 by 2000 pixels, with "Up to 50 total photos, videos, or virtual tours" in a single listing. A video competes against photos for that slot count in systems built that way.
How many files you get
One uploaded video per listing is the common pattern, with a separate field for a hosted link. NorthstarMLS allows the single uploaded file plus one more URL for a video or virtual tour, and states that "You can only have two (2) virtual tours." That matters for planning. If you want a branded version anywhere in the buyer's path, it does not live in these fields.
The rule that fails more videos than the file format does
Branding. Not your logo specifically, but the whole category of anything that identifies you rather than the house.
CRMLS writes the broadest definition of it in the business: "CRMLS defines branding as the use of any media content to identify a person or entity," and its examples of media content that may be considered branding include "signs, contact information, identifiable persons, logos, slogans, catchphrases, external links/references, team names." Branded content in MLS media results in its removal, a citation and a fine, and CRMLS says it issues that citation with an immediate fine rather than a warning notice first.
NorthstarMLS puts it as a flat instruction: "Do not upload branded videos to the MLS." Its guidance is specific about what counts, saying a video "must not contain broker/agent identity (such as showing a 'For Sale' sign or showing yourself in the video)." A yard sign in your establishing shot is broker identity. So is your reflection in the hallway mirror.
Houston's HAR publishes the fine amount, which makes the cost concrete. Under "Virtual Tour Contains Contact Information," a $100 fine applies, and the rule reads that "Virtual tours or any accompanied audio descriptions shall not include any contact information such as names," adding that "The primary focus of the tour shall be of the subject property" and that "Links to galleries or other websites are prohibited." The same schedule fines contact information in photos at $250 or $500, which tells you how seriously the branding line is treated across media types.
What you are actually allowed to leave in
A little more than most agents assume, and it is worth knowing so you are not stripping things that were fine. NorthstarMLS permits the production company's branding logo in a virtual tour, with the condition that "it must not be a live link," and permits identification of the listing office "in 10pt font." Unidentified voiceover narration is acceptable there, as long as narrators "should not identify themselves, the listing agents or any other individuals or companies," and do not become the focus. Sharing has to be disabled inside the tour, and there should be "no links to any other sites."
People are a separate problem from branding. NorthstarMLS asks that, "Like MLS photos, tours should not include identifiable individuals or individuals that become the focus," which rules out the family who still lives there wandering through frame as much as it rules out you.
One more trap worth naming because it catches agents who did everything right inside the file. CRMLS allows a YouTube link in the unbranded virtual tour field, but only conditionally: unbranded channels carrying general property descriptions are allowed, while channels that include agent or brokerage details, logos, photographs "or anything that connects them to an agent or brokerage are prohibited." A perfectly clean video, hosted on your own branded channel, fails on the channel, not the video.
The accuracy clause, and why an AI video has to be able to answer for it
This is the clause that has gone from boilerplate to load bearing in about two years. NorthstarMLS requires that a video accurately depict the property and its surroundings, and that it "must not be digitally altered in a way that misrepresents the property or its surroundings." Its virtual tour guidance says plainly that "Video tours should accurately reflect the properties they feature" and that a tour "should describe only the physical traits of the property for sale and its vicinity."
Read that against what an AI video tool does to your photos. Camera motion generated by a model is inference. It invents the frames between the pixels it was given, and on a bad clip that means a doorway that bends, a countertop that grows, or a window that opens onto a yard that was never there. Virtual staging puts furniture in a room that is empty in real life. Neither is automatically a misrepresentation, and neither is automatically safe. The question an MLS will ask is whether the finished video still shows the house as it is.
Where that line sits, and which MLSs have written it down, varies enough that it deserves its own treatment. We have mapped it in the MLS rules for AI-generated listing media, MLS by MLS, including which boards require a disclosure line on staged imagery and where the wording lands. The practical habit: keep structural geometry honest, keep staging obviously staged, disclose it where your board asks, and watch your own output for the clip where the model got creative with a wall.
A pre-upload checklist
- Format: MP4 unless your MLS asks for something else in writing.
- Size: check the actual file size against your MLS's cap before you start the upload, not after it fails.
- Orientation: landscape for the MLS. Vertical cuts are for social feeds.
- Your name: nowhere in the video, the audio, the end card, the filename habits you share with clients, or the hosted channel if you are using the URL field.
- Signage: no yard sign, no rider, no sticker on the window in any frame.
- People: no identifiable individuals, including you in a mirror or a glass door.
- Links: none inside the video or the tour, and sharing disabled where the platform offers it.
- Accuracy: watch the whole thing once at full size and flag any frame where geometry warps or a feature appears that the house does not have.
- Disclosure: staging labeled where your board requires it.
What ShowcaseVideos.ai hands you, stated in MLS terms
Since the question "will this file upload" is really a question about what comes out the other end, here is what ours produces, in the same terms the rules are written in.
Every render is an MP4. The widescreen version is 2560 by 1440, landscape 16:9, which is the orientation the MLS field wants. A full 30-photo listing runs a little over two minutes with its title cards. The vertical 9:16 and square 1:1 cuts run about 45 seconds and exist for Instagram, TikTok and Facebook, not for the MLS field.
On the branding question, the defaults are mostly in your favor and there are two switches to know about. The address and price lower-third carries property facts, not your name or your phone number, which is the side of the HAR contact information rule you want to be on. The branded end card is a plan feature, so it is something you add rather than something you have to find and remove, and it is the one element to leave off the copy headed for the MLS. The exception worth saying out loud: renders on the Free plan carry a watermark until the account is activated, and a watermark is branding by every definition quoted above, so a Free render is a preview rather than an MLS upload.
Source material comes from a Zillow or Redfin listing URL, or from photos you upload directly, up to 30 per video at 15MB each. Virtual staging happens inside the render rather than as a separate pass on the stills, which keeps the staged room consistent across every frame it appears in. If you want the broader workflow around all of this, start with the complete guide to making a real estate listing video.
Pricing works in credits, with one credit pegged to five cents of underlying cost, so a small listing bills as a small listing instead of as a flat monthly fee you grow into. See what a listing video costs in credits and work backwards from how many listings you actually take.
Frequently asked questions
What video file format does the MLS accept?
MP4 is the answer to standardize on. NorthstarMLS accepts MP4, MOV or AVI, one video per listing, and MP4 is the format least likely to be rejected by any other system you also feed. Check your own MLS's media rules, because the accepted list is set board by board.
Is there a file size limit for an MLS video?
Yes, and it is set locally. NorthstarMLS publishes a 300MB maximum per uploaded video. The limit is on bytes rather than minutes, so resolution and bitrate matter more than length, and a 4K copy is the version most likely to exceed a cap.
Can my listing video show a For Sale sign?
No, where the rules follow the common pattern. NorthstarMLS states a video must not contain broker or agent identity and gives "showing a 'For Sale' sign or showing yourself in the video" as its examples. CRMLS counts signs within its definition of branding, which carries a citation and an immediate fine.
Can I use my branded YouTube link in the virtual tour field?
Usually not. CRMLS permits a YouTube link in the unbranded virtual tour field only when the channel itself carries no agent or brokerage details, logos or photographs. An unbranded video on a branded channel still fails.
Does AI camera motion or virtual staging break MLS rules?
Not inherently, but it is governed by the accuracy clause. NorthstarMLS requires that a video not be "digitally altered in a way that misrepresents the property or its surroundings," so generated motion that warps real geometry is a problem while a smooth move across an unaltered room is not, and staged rooms need to be disclosed wherever your board requires it.
How long should an MLS listing video be?
Length is rarely the regulated number, file size is. For a typical listing, a video of roughly a minute to two and a half minutes covers the house without losing the viewer, which is about where a 30-photo render lands naturally.
