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Reddit resource guide

Reddit ad specs for image, video, carousel and free-form ads

Every Reddit ad spec in one place: image and video sizes, carousel cards, free-form limits and headline lengths, plus the checks we run before a Reddit campaign goes live.

Specs checked 3 October 2026 against Reddit's ad unit specifications

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1440 × 1080 px4:3 · JPG, PNG or GIF · 3 MB max

Your headline, kept under 100 charactersHeadline · 300 max, 100 recommended

yourbrand.comDisplay URL · 100 max

Headline max / recommended
300 / 100
Cross-device image, 4:3
1440 × 1080
Image file limit
3 MB
Video file limit
1 GB

Creative specs

Reddit ad specs by format

Reddit ads run in feed and conversation placements. Each ad type has its own file, size and text rules, so build creative for the format you will run.

01Image ads

A headline, an image and a destination URL. Tapping the image opens your landing page.

Headline
300 characters max, 100 recommended, 80 if truncation is a concern
Image file
JPG, PNG or GIF, 3 MB max
Cross-device size
4:3 at 1440 × 1080 px
Mobile sizes
1:1 at 1080 × 1080, 3:4 at 1080 × 1440, 4:5 at 1080 × 1350 or 16:9 at 1920 × 1080 px
Destination URL
Required, 268 characters max
Display URL
100 characters, on the same domain as the destination
Thumbnail
For conversation and compact view: 4:3 at 400 × 300 px, 3 MB max

02Video ads

A headline and a video. In the feed on desktop and mobile the video autoplays, though users can switch autoplay off.

File
MP4 or MOV, 1 GB max; ProRes not supported
Length
2 seconds to 15 minutes, 5 to 30 seconds recommended
Frame rate
30 FPS max
Cross-device sizes
4:3 at 1440 × 1080 or 16:9 at 1920 × 1080 px
Mobile sizes
Also 1:1 at 1200 × 1200, 3:4 at 900 × 1200 or 4:5 at 1200 × 1500 px
Headline
300 characters max, 100 recommended
Thumbnail
JPG, PNG or GIF, 3 MB max, in a ratio that matches the video

03Carousel ads

Two to six swipeable images, each with its own landing page and an optional caption.

Cards
2 to 6 images; Reddit strongly recommends one ratio for all
Files
JPG, PNG or GIF; GIFs up to 3 MB, other files up to 20 MB
GIF length
3 to 10 seconds recommended
Cross-device sizes
4:5 at 1200 × 1500, 4:3 at 1440 × 1080 or 16:9 at 1920 × 1080 px
Caption
Optional, 50 characters per card
Destination URL
268 characters, one per card
Headline
1 per ad, 300 characters max, 100 recommended

04Free-form ads

A rich text post with a headline, long body copy, inline links and media. Clicking the ad opens the post.

Headline
300 characters max, 100 recommended
Body
40,000 characters; show 3 to 6 lines of plain text for the feed
Images
Up to 20; JPG, PNG or GIF, 10 MB max, 1000 px wide or more
Videos
Up to 5; MP4 or MOV, 1 GB max, 50 to 100 MB recommended
Caption
50 characters per image or video
Thumbnail
JPG or PNG, 3 MB max; without one, no media shows in feeds
Objectives
Traffic or awareness and consideration, in Standard campaigns

05Interactive ads

A headline plus a quiz, poll or countdown that people use right in the feed. Feed placement only.

Templates
Quiz, poll or countdown
Campaigns
Standard campaigns with awareness and consideration or traffic objectives
Images
JPG or PNG, 3 MB max
Logo
1:1 at 512 × 512 px
Backgrounds
Mobile 4:5 at 816 × 1024 px, desktop 4:3 at 1400 × 1024 px
Quiz
2 to 4 questions of 95 characters, 2 to 4 outcomes, CTA up to 20 characters
Poll
1 question of 70 characters, 1 to 5 answers of 30, CTA up to 30 characters
Not supported
Display URLs, disclaimer text and thumbnails

06Max campaign assets

Reddit's automated campaign type, in beta. It picks the best headline, media and call to action for each impression.

Headlines
3 to 15, 300 characters max; at least 5 under 50 characters recommended
Media
1 to 30 assets in total: up to 20 images and 10 videos
Images
JPG, PNG or GIF, 10 MB max, 1000 px wide or more
Videos
MP4 or MOV, 100 MB max, 5 to 30 seconds recommended
Thumbnails
Up to 10, JPG or PNG, 3 MB max, 4:3 or 1:1
Calls to action
Up to 5, with 2 or more recommended
Objectives
Traffic, app promotion and sales; image and video ads only

07Dynamic product ads

Ads built automatically from your product catalogue, for prospecting or retargeting. Physical products only.

Image
Square 1:1, 500 × 500 px minimum recommended
Ad types
Image for one product, carousel for several
Headline
Under 300 characters
Caption
Product description or price; sale prices show the original struck through
Events needed
ViewContent, AddToCart and Purchase, each with a product ID
Matching
Product IDs in your catalogue and Pixel must match
Retargeting window
30 days recommended

Character limits

Reddit headline and file limits at a glance

Every Reddit format takes a 300-character headline, but text can be cut on smaller screens. Reddit recommends 100 characters, or 80 if truncation is a concern.

Reddit headline and file limits at a glance
FormatHeadlineMedia filesOther text
Image300 max, 100 recommendedJPG, PNG or GIF, 3 MBDisplay URL 100
Video300 max, 100 recommendedMP4 or MOV, 1 GBDisplay URL 100
Carousel300 max, 100 recommended2 to 6 images; GIF 3 MB, others 20 MBCaption 50 per card
Free-form300 max, 100 recommendedUp to 20 images and 5 videosBody 40,000; caption 50
Interactive300 max, 100 recommendedJPG or PNG, 3 MBQuiz title 60; poll question 70
Max campaigns300 max; 5 or more under 50 recommendedUp to 20 images and 10 videosUp to 5 calls to action

Creative testing

What to test in Reddit ads

These ideas come from Reddit's creative best practices, including its study of over 100,000 ads. Treat them as test ideas, not rules: results depend on your audience and offer.

Headline tests

  1. Brand name in the headline

    Reddit saw an average 6.5% improvement in conversion rate and CPA when headlines named the brand. Test with and without it.

  2. Speak to the reader

    Second-person words like “you” and “yours” make the message personal. Test them against a neutral line.

  3. Lead with a question

    A question can engage people around a problem they recognise. Test it against a plain statement.

  4. Show the price

    Reddit says clear price points make clicks more intentional. Test a headline with your price against one without.

  5. Fresh variations

    Reddit suggests keeping at least a third of headlines unique and refreshing them every 3 to 4 weeks. Test new phrasing on that cycle.

Creative tests

  1. Captions and on-screen text

    Mobile users often watch with the sound off. Test captioned video against a version without.

  2. Logo in the top left

    Feed readers look to the top left first, where usernames sit. Test a top-left logo against your usual placement.

  3. Brand in 3 seconds

    Reddit recommends showing your brand within the first 3 seconds of a video. Test an early logo against a late reveal.

  4. Shorter video

    Reddit notes that videos longer than 30 seconds tend to be less effective. Test a shorter cut against your current length.

  5. Show the product

    Reddit says showing how the product works encourages purchase. Test product-in-use footage against lifestyle shots.

Before launch

Eight checks before a Reddit campaign goes live

  1. Keep headlines short

    Headlines can run to 300 characters, but Reddit recommends 100, or 80 where truncation is a risk.

  2. Match the display URL

    The display URL must use the same domain as your destination URL, and the landing page must match the ad.

  3. Keep URLs out of headlines

    Reddit asks advertisers not to put URLs in ad headlines unless the law requires it.

  4. Add a thumbnail

    Conversation placement and compact view use a thumbnail. Upload a 400 × 300 px image rather than relying on the automatic one.

  5. Caption every video

    Mobile users often have sound off. Add closed captions, and make sure any spoken language matches the ad copy.

  6. Watch your capitals

    No more than 50% of ad copy can be capitalised, and emojis or symbols should not be used just to grab attention.

  7. Set up app measurement

    App promotion campaigns need separate Android and iOS ad groups, with MMP postbacks, or SKAdNetwork for iOS.

  8. Submit 48 hours early

    Review usually takes up to a day. Reddit recommends submitting at least 48 hours before launch, and most edits restart review.

FAQ

Reddit ad specs, answered

Short answers to the questions we hear most when teams prepare Reddit creative.

What is the Reddit ad headline character limit?

300 characters for every format, but Reddit recommends keeping headlines to 100 characters, or 80 if truncation is a concern. In Max campaigns it suggests at least 5 headlines under 50 characters.

What size should Reddit image ads be?

1440 × 1080 px at 4:3 works across devices. For mobile, Reddit also recommends 1:1 at 1080 × 1080, 4:5 at 1080 × 1350 and 16:9 at 1920 × 1080 px. Files can be JPG, PNG or GIF up to 3 MB.

How long can a Reddit video ad be?

2 seconds to 15 minutes, though Reddit recommends 5 to 30 seconds. Files can be MP4 or MOV up to 1 GB, at 30 FPS or less.

How many images can a Reddit carousel ad have?

2 to 6. Each card can have its own destination URL and a caption of up to 50 characters, and Reddit strongly recommends the same aspect ratio for every image.

How long can a Reddit free-form ad be?

40,000 characters of body text, with up to 20 images and 5 videos. Reddit suggests showing 3 to 6 lines of plain text in the feed, and adding a thumbnail so media shows there.

How long does Reddit ad review take?

Usually up to 1 day, but it can take longer. Reddit recommends submitting at least 48 hours before your start date, and most edits send the ad back for review.

What can Reddit interactive ads do?

3 templates: quiz, poll and countdown. They run only in the feed placement, in Standard campaigns with awareness and consideration or traffic objectives.

Sources. Specs checked on 3 October 2026 against Reddit's ad unit specifications, Image ad specifications, Video ad specifications, Carousel ad specifications, Free-form ad specifications, Free-form ads, Interactive ad specifications, About interactive ads, Max campaigns ad specifications, Max campaigns, Dynamic product ads, Ad format by objective, Creative best practices, Ad review process, Editorial requirements, About app promotion ads. Platforms update specs often, so confirm them in the ad manager before you upload.

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