Image size and format is the unglamorous end of car listing photography. Nobody buys a car because the JPEG was well compressed. But get it wrong and buyers see soft, blocky photos on the portals and slow-loading pages on your own website — and both of those cost you.
This guide covers the working rules that keep your listing photos sharp everywhere they appear, without turning anyone into an imaging specialist.
Why Size and Format Matter at All
Two things go wrong when image size and format are handled carelessly.
Compression artefacts on the portals. Every listing platform recompresses what you upload. If your source image is already heavily compressed — saved at low quality, screenshotted, passed through WhatsApp — the portal compresses it again. Compression on top of compression is where the blockiness around edges and the smeared detail in paintwork comes from. The car looks worse than it did on your phone, and you cannot fix it after upload.
Slow pages on your own site. The opposite failure. Uploading enormous, untouched files straight to your own website makes every vehicle page slow to load, especially on mobile, where most buyers are browsing. Slow pages lose visitors before they ever see the car.
So the goal is a clean, high-quality source for the portals, and a sensibly sized version for your own site. Different destinations, different needs.
The Safe Working Rules
You do not need to memorise a spec sheet. A few habits cover almost everything.
Shoot bigger than you need. Any modern phone captures far more resolution than any listing platform displays. Keep it that way. Never enlarge a small image to meet a size requirement — upscaling invents detail that is not there and it shows. You can always scale down; you can never genuinely scale up. If your phone photos are coming out soft in the first place, the fix is at capture, not in editing — see how to photograph cars properly on a phone.
Shoot landscape. Portals display vehicle photos in landscape viewers. A portrait photo gets letterboxed, cropped, or shrunk — whichever happens, the car ends up smaller on screen. Landscape orientation, car filling most of the frame, is the default for every exterior shot.
Keep one clean original. Whatever editing you do, keep the highest-quality version as your master. Export copies for each destination. Once a photo has been compressed, that quality is gone for good.
Leave breathing room around the car. Platforms crop differently — listing thumbnails, search results, social shares all take slightly different slices of your image. A car framed with a margin of space survives those crops. A car touching the edge of the frame gets its bumper cut off somewhere.
JPEG, WebP, PNG — Which Format?
JPEG is the universal answer for portals. Every platform accepts it, every browser displays it, and at a high quality setting the compression is invisible on a car photo. When in doubt, a high-quality JPEG is never the wrong upload.
WebP produces noticeably smaller files at the same visible quality, which makes it the better choice for your own website, where page speed is your problem to solve. Most modern site platforms handle WebP automatically. The portals generally want JPEG or PNG at upload, so WebP is a your-site format, not a portal format.
PNG is lossless and large. It exists for graphics with hard edges — logos, overlays, screenshots. For photographs of cars it offers nothing over a high-quality JPEG except a much bigger file. Skip it for listing photos.
The practical split: high-quality JPEG to the portals, WebP (or whatever your site platform optimises to) on your own pages.
What Portals Do to Your Images
When you upload to Auto Trader or any other listing platform, your image does not appear as uploaded. The platform resizes it for its own display sizes — search thumbnails, gallery view, full screen — and recompresses each version.
This has one big implication: upload the cleanest, highest-quality source you have. The platform's compression is going to happen regardless. The only thing you control is how good the image is going in. A clean source survives recompression well. A degraded source degrades further.
Exact pixel dimensions and file size limits vary by platform and change over time, so check each platform's current published spec rather than working from a number you read somewhere two years ago. As a rule, any straight-off-the-phone photo comfortably exceeds the minimums; the failures come from images that have been shrunk, screenshotted, or re-saved along the way.
On photo count rather than size: Auto Trader's own advertising advice is to use a full set of photos covering the whole car — sharpness matters across all of them, not just the lead shot.
Aspect Ratios: Portals, Your Website, Social
There is no single aspect ratio that works everywhere, which is why the framing-with-margin habit matters.
Portals display landscape. A standard landscape phone photo fits their viewers without awkward cropping.
Your own website is under your control — pick one ratio for vehicle imagery and use it everywhere. Consistent ratios are part of what makes a stock page look professional rather than assembled. Framing, like sharpness and exposure, is one of the quality levers covered in how to improve car photo quality.
Social crops are the awkward one. Feeds favour square and vertical formats, which take a brutal slice out of a landscape photo. If social is part of your stock marketing, either export a separately framed version or make sure the car sits centred with generous margin so the centre crop still works.
File Naming Hygiene
Small thing, real payoff. A folder of IMG_4471.jpg files is unusable three weeks later.
A simple convention — registration or stock number, then the angle — solves it:
AB12CDE-front-34.jpgAB12CDE-rear.jpgAB12CDE-interior-dash.jpg
You can find any car's photos instantly, you can hand a batch to anyone without explanation, and on your own website descriptive filenames give search engines a hint about the content that IMG_4471 never will.
It matters more as volume grows. If you are processing stock in batches rather than one car at a time, consistent naming is what keeps the batch manageable — see what bulk image processing means for dealers.
Where Motuva Fits
Motuva works in the browser: upload your phone photos through the web app, apply your studio background, and download finished listing photos in standard formats ready for the portals or your own site. The quality of the output follows the quality of the input — which is exactly why the source-quality habits above are worth keeping.
The free tier is 20 images a month, full output quality, no watermark, no card required.
Start free — no card, no demo →
The Short Version
- Shoot landscape, bigger than you need, car centred with margin.
- Keep a clean master; export copies per destination.
- High-quality JPEG to the portals; WebP on your own site.
- Never upscale, never re-save through messaging apps.
- Check each platform's current spec rather than trusting old numbers.
- Name files by stock number and angle.
Related reading:
Related reading
A practical guide for dealers: improve the photo quality of your car listings from shooting to background treatment — no professional photographer needed.
Practical phone photography tips for car dealers — lighting, angles, shot list, and common mistakes. No expensive kit, no guesswork.
Bulk image processing means applying the same edits to a batch of photos in one operation. How it works for car dealers and why it matters at volume.