Image Size and Format Problems to Fix Before You Post

The photographer did the job. The files are in a folder named after the stock number. The associate opens Marketplace, selects all, and the form either chokes or produces a listing that looks like it was shot through a screen door. The argument that follows is always the same: "We need maximum quality" versus "Just get it up." Both are wrong. Quality after Marketplace compression is the only quality that exists. The file you attach is a delivery vehicle, not a print master.

Image size and format problems to fix before you post are predictable. They cluster in four piles: files that are too heavy, files that are too light, files in a format the form handles poorly, and files that are the wrong kind of document wearing a photo extension. None of this requires a published Meta byte limit. Those limits change; check current Marketplace behavior. Your store needs a standard that still looks sharp after compression and still uploads on a Tuesday afternoon.

This is for used-car managers and internet directors who already fought resolution and file size in training and still find HEIC and WhatsApp screenshots in the posting folder. Fix the folder. Do not debug the form.

Why Image Size and Format Problems Show Up at the Worst Time

They show up at post because that is the first time a browser has to send the bytes. Capture looked fine. The desktop thumbnail looked fine. The form is the first hostile environment.

Heavy files stall the queue

A stall set of large originals can take longer to attach than the rest of the listing takes to fill. During that window, laptops sleep, Wi-Fi hops, and associates get pulled to the driveway. The post fails. The next instinct is retry. Retrying a 20-file heavy set is how you burn a conservative daily cadence on one unit.

Light files look like a wholesale flyer

Chat compressions, cropped screenshots, and 640-pixel-wide interiors make a legitimate dealer listing look like a curbstoner. Shoppers do not give you the benefit of the doubt. Reports and ignored listings follow. You did not save time. You saved a few kilobytes and spent the unit's first day looking cheap.

Format roulette

HEIC, PNG, PDF, WEBP, BMP. One will work on the manager's Mac and fail on the lot Windows box. Another will attach and display as a black square. A third is a window sticker that should be a supplement, not image 1.

Why "we'll convert in the form" never happens

The form is a bad converter. The person at the form is in a hurry. Conversion belongs in the transfer step, when the files hit the store folder, with a naming rule so the next shift does not inherit a mixed pile.

Image Size and Format Problems to Fix Before You Post: The Store Standard

Write this down. Train it. Audit it. If it lives in one photographer's head, it will die on their day off.

Format

• Posting folder is JPEG. Period, unless you have a written exception the desk actually uses.
• Convert HEIC at import from the phone, not at 4:45 p.m. in Chrome.
• PNG only if you have a graphic you truly need; vehicle photos should not be PNG by default.
• PDFs are not photos. A window sticker PDF belongs in the deal jacket, or as a dedicated readable JPEG if you choose to show it. It is not the lead image. See window sticker and paperwork photos.
• No chat-app exports as the source of truth.

Size (operating standard, not a Meta quote)

• Large enough that the three-quarter front still looks like paint after compression.
• Small enough that a full set attaches without drama on the lot network you actually use.
• Consistent across the set. Mixing a huge DSLR exterior with a tiny phone interior teaches the form to fail at a random file.

If you need a number for training, pick one internally, test it on your network, and revisit when phones change. Do not put a guessed "Facebook maximum" on the wall.

Dimensions and orientation

• Exteriors in landscape unless you have a reason. Portrait exteriors waste the Marketplace card. The landscape vs portrait decision belongs at capture, not at crop-in-the-form.
• Do not stretch. A 4:3 shot padded with black bars is still a bad card.
• Odometer and dash must remain readable at phone width. If the digits smear after a test compression, reshoot, do not upsample.

What never goes in the posting folder

• Burst duplicates.
• Video frames saved as random stills.
• Watermarks so heavy they are the subject. If you brand photos, keep it light; watermarks and logos are a separate decision, not a format fix.
• Another platform's UI chrome (a screenshot of a listing).

Capture Settings That Survive Compression

The cheapest time to fix size and format is before the shutter, not after.

Phone defaults

Most floor phones are set to "highest" because it sounds professional. Highest is often HEIC plus maximum dimensions. Change the store devices:

• Most compatible / JPEG if the phone offers it.
• A resolution that still looks sharp on a phone after Marketplace compression, not the setting designed for a 30-inch print.
• HDR is fine; night mode on a dark lot is usually not. Grain plus compression is how black paint turns to mud.

Camera and lot tablet

If you shoot DSLR or mirrorless for aged units and special cars, export a posting JPEG, not the RAW, into the stock folder. The RAW stays in archive. The posting folder never sees it.

Transfer path

1. Shoot.
2. Land in a per-unit folder named with stock or last-six VIN.
3. Convert and recompress to the store standard.
4. Delete obvious junk.
5. Only then is the unit allowed into a posting queue.

If step 3 is optional, it will be skipped. Make it the door between photography and inventory.

A Pre-Post Image Gate (Five Looks)

The associate does not need Photoshop. They need five looks before they select files.

1. Extension. .jpg / .jpeg. Anything else gets converted or pulled.
2. Lead. Three-quarter front, this color, this VIN, daylight if you have it.
3. Weight outliers. One file wildly larger or smaller than the rest is the one that will fail or look awful.
4. Readable details. Odometer, options screens, damage close-ups. If you cannot read them on the phone in the folder, neither can the shopper.
5. Count. A tight, complete set beats a dump. Extra near-duplicates add upload risk and add nothing to the card.

Run this gate on every unit, including auction captures. A downloaded auction photo that is already tiny will not become sharp because you posted it to Marketplace.

How PostToMarket Automates This

Image size and format problems to fix before you post are folder problems. They become Marketplace problems the moment a rep selects "all" from a camera roll. The form should never be the first place anyone learns the files are wrong.

PostToMarket holds the vehicle in inventory so the set can be chosen with the Facebook photo picker instead of a panic dump from the phone. Capture from auction and wholesale sites can seed inventory with a starting set you still have to gate, rather than retyping the unit while hunting images in email. The extension posts one vehicle at a time with human-like delays, so a heavy set that stalls does not collide with the next unit. Failed status stays on the vehicle when an upload does not complete. Unlimited inventory on every plan means you are not skipping the image gate to ration listings. PostToMarket cannot make a 0 KB file upload, and it is not affiliated with Meta. It can keep the selection step in the workflow instead of in a crashed tab.

Fix the Files in the Folder, Then Post

Image size and format problems to fix before you post belong in the folder, not in a spinner argument. Every minute you spend retrying a bad format is a minute you could have spent converting the files once.

PostToMarket gives you inventory, a photo picker, paced one-at-a-time posting, and a failed state the desk can see. Starter at $59 per month covers a solo seller or independent lot with one login. Dealership at $299 per month covers a team of up to 13 logins, including two managers.

Start your 10-day free trial through secure Stripe checkout. Bring a real folder of lot photos, convert to the store standard, and post without discovering HEIC in the form. Cancel anytime.