Native Ad Sizes: Specs for Every Network

There is no single native ad size — every network crops your image to fit each publisher's widget. Build one master image at 1200 pixels wide or larger, keep the subject centred, and export a few crops. Here are the exact specs, character limits and file-weight targets for each network.

There is no single native ad size. Every network crops your image to fit whatever widget each publisher runs, so what matters is the aspect ratio you design for and whether the image survives being cropped. The practical answer: build one master image at 1200 pixels wide or larger, keep the subject in the middle 60–70% of the frame, then export a handful of crops — 16:9 for Taboola, 3:2 for Teads and MGID, 4:3 for Revcontent, and 1:1 for square slots.

That single habit clears spec on every major network. Below are the exact native ad dimensions for each platform, the character limits that go with them, and how to get file weight down without the image turning to mush at thumbnail size.

Native ad sizes by network

Sourced from each network's own documentation, current to September 2026. Networks revise specs without announcement — verify before a large launch.

Headline and description limits

Image dimensions are only half of native ad specs. The text has hard limits too, and exceeding them means either rejection or silent truncation mid-sentence.

Taboola's 34–45 character recommendation is worth taking seriously. Sixty characters is the ceiling, not the target — longer headlines get cut off in narrow publisher widgets, and a headline truncated mid-thought loses the curiosity that earned the click. Our headline analyzer flags length problems along with the policy constructions that trigger rejection.

The one-master-image method

Producing a separate original for every network is wasted effort. Build one master and crop it.

1. Shoot or select at 2000 px wide or more. You can always crop down; you cannot invent detail by scaling up. Most networks will shrink an oversized image but never enlarge a small one.
2. Compose with the subject centred in the middle 60–70% of the frame.
3. Export four crops: 16:9 at 1600 × 900, 3:2 at 1200 × 800, 4:3 at 1000 × 750, and 1:1 at 1080 × 1080.
4. Check each crop at thumbnail size before uploading — shrink it to about 150 px wide and see whether you can still tell what it is.

Designing for the crop, not the pixel

This is the part most advertisers miss. A native network serves one creative into thousands of different publisher templates — a large card on one site, a 100-pixel thumbnail on another. Each template crops and scales differently, and that is by design, not a bug.

Revcontent states it plainly in its own policies: the system automatically crops and resizes your image to fit various placements, so important content should not sit near the edges.

The safe-zone rules

• Faces and products belong in the centre. A face cropped in half converts nothing.
• No text near the edges. If you must use text, keep it well inside the middle.
• No borders or frames. Revcontent explicitly rejects borders, partial borders and visible white space on any edge, and other networks treat them the same way.
• Fill the whole frame. Letterboxed images with white bars get refused.
• Avoid collages. Multi-panel images become unreadable at thumbnail size and several networks ban them outright.

How to optimize the size of native ads

"Size" means two different things, and both matter. Dimensions decide whether your ad qualifies for a placement. File weight decides whether it loads before the reader scrolls past. Here is how to optimize the size of native ads on both counts.

File weight targets

Remember where these ads appear. A large share of native impressions are mobile, often on slower connections. An image that takes two seconds to appear has already lost readers who scrolled past — and you paid for that impression.

Getting the weight down without ruining the image

1. Export JPEG at quality 70–80. Above 85 you add weight for detail nobody sees at thumbnail size. Below 65, compression artefacts start showing on faces.
2. Use WebP where the network accepts it. Revcontent supports it and it typically saves 25–35% at the same visual quality. Do not assume every network takes it — Taboola and Teads standard native list JPG and PNG.
3. Choose JPEG over PNG for photographs. PNG is for graphics with flat colour and sharp edges; on a photo it can be several times larger for no visible gain.
4. Resize before compressing. A 4000-pixel image squeezed to 200 KB looks worse than a 1600-pixel image at the same weight.
5. Strip metadata on export. Camera EXIF data can add tens of kilobytes and serves no purpose in an ad.
6. Avoid heavy noise and grain. Both compress badly and inflate file size.

Our free tools page lists the utilities we use for this, and if you want to see what competitors are uploading, our guide to finding competitor ads covers the tools that download their creatives.

For how each format appears on a phone, see our mobile native advertising examples.

What actually makes a native image work

Meeting the native ad image size requirement only gets your ad served. Whether it earns clicks is a separate question, and the answer is less about resolution than most people expect.

The underlying logic: native ads sit inside editorial content. A creative that looks like an ad is visually flagged as an ad and skipped. A creative that looks like a photograph from the article gets looked at.

Image problems that get creatives rejected

Roughly a third of native ad rejections are the image rather than the headline. The recurring causes:

The full list of copy and creative rules, including the headline constructions that get refused, is in our guide to why native ads get rejected.

Testing creative at the right sizes

Native creative fatigues quickly — typically within two to three weeks — so you will be producing new images constantly. A routine helps.

1. Launch 5–8 images per campaign. Fewer and you are guessing; more and each gets too little budget to judge.
2. Change one variable at a time. Same headline across images, so differences are attributable to the image.
3. Wait for about 1,000 impressions per creative before judging anything.
4. Judge on conversions, not click-through rate. A curiosity image can earn clicks that never convert.
5. Keep the winners, replace the losers, and refresh before performance decays rather than after.
6. Re-crop winners to other ratios before expanding to a second network.

Choosing sizes by platform mix

Which crops you need depends on where you buy.

If you are deciding between networks in the first place, our comparison of Taboola vs Teads vs MGID covers reach and pricing, and note that Outbrain is now Teads — its specification pages still live on the outbrain.com domain, which causes some confusion.

The short version

Design one master image at 1200 pixels wide or larger with the subject centred. Export 16:9, 3:2, 4:3 and 1:1 crops. Keep files under 500 KB, ideally under 200 KB. Stay under the 2.5 MB ceiling on Taboola and Teads. Keep anything important out of the outer 15% of the frame, and check every crop at thumbnail size before it goes live.

Get those right and native ad sizes stop being something you think about — leaving your attention for the parts that actually decide performance: the angle, the landing page and the publishers you block.

Primary sources worth bookmarking: Taboola's thumbnail documentation, Outbrain and Teads ad specs, and Revcontent's ad copy policies.

Specifications are taken from each network's official documentation and are current to September 2026. Networks revise specs without announcement — verify against the primary sources linked above before a large launch.