Instagram vs Reddit Ads image sizes 2026

One file works on both for 1 formats, one layout with two exports for 1, and 2 need their own layout. 2 of 9 layouts below serve both platforms.

InstagramvsReddit Ads

Check one creative against Instagram and Reddit Ads

Drag & drop your creative or click to choose a file Checked against 22 placements on both platforms

Or type a size

Nothing is uploaded or saved — the check runs entirely in your browser.

Format by format

The main size of each format on both platforms, and whether one file covers both.

Placement	Instagram	Reddit Ads	For both
Square	Feed Image - Square (1:1) 1:130 MB JPGPNG	Image Ad / Promoted Post - Square (1:1) 1:13 MB JPGPNGGIF	One file
Vertical / Portrait	Feed Image - Vertical/Portrait (4:5) 4:530 MB JPGPNG	Image Ad / Promoted Post - Portrait (3:4) 3:43 MB JPGPNGGIF	Different layouts
Stories / Reels	Stories Image (9:16) 9:1630 MB JPGPNG	—	Only on Instagram
Landscape	Feed Image - Landscape (1.91:1) 1.91:130 MB JPGPNG	Image Ad / Promoted Post - Landscape (16:9) 16:93 MB JPGPNGGIF	Different layouts
Carousel	Carousel Card - Vertical (4:5) 4:530 MB JPGPNG	Carousel Ad Card 4:5 (also 1:1, 4:3, 16:9; same ratio on all cards recommended)20 MB JPGPNGGIF	One layout, two exports
Profile picture	Profile Picture 1:1— JPGPNG	—	Only on Instagram

One creative set for both

Layouts: 9 · used on both platforms: 2

4:5Image Both

Master size Export sizes Max weight3 MBReddit Ads FormatsJPGPNG

Instagram Feed Image - Vertical/Portrait (4:5) 1440×1800·Carousel Card - Vertical (4:5) 1080×1350·Explore Image/Video (4:5) 1440×1800

Reddit Ads Image Ad / Promoted Post - Portrait (4:5) 1080×1350·Carousel Ad Card 1200×1500·Interactive Ad (Quiz, Poll, Countdown) 816×1024
1:1Image Both

Master size Export sizes Max weight3 MBReddit Ads FormatsJPGPNG

Instagram Feed Image - Square (1:1) 1080×1080·Carousel Card - Square (1:1) 1080×1080

Reddit Ads Image Ad / Promoted Post - Square (1:1) 1080×1080·Free-form Ad (Rich Text Post) 1200×1200
9:16Video

Master size Export sizes Max weight4 GB FormatsMP4MOV

Instagram Feed Video (9:16) 1080×1920·Stories Video (9:16) 1440×2560·Reels Video (9:16) 1440×2560
9:16Image

Master size Max weight30 MB FormatsJPGPNG

Instagram Stories Image (9:16)·Reels Image (9:16)
4:3Image

Master size Export sizes Max weight3 MB FormatsJPGPNGGIF

Reddit Ads Image Ad / Promoted Post - Landscape (4:3) 1440×1080·Image/Video Ad Thumbnail (classic-mode) 400×300
1.91:1Image

Master size Max weight30 MB FormatsJPGPNG

Instagram Feed Image - Landscape (1.91:1)
3:4Image

Master size Max weight3 MB FormatsJPGPNGGIF

Reddit Ads Image Ad / Promoted Post - Portrait (3:4)
16:9Image

Master size Max weight3 MB FormatsJPGPNGGIF

Reddit Ads Image Ad / Promoted Post - Landscape (16:9)
1:1Video

Master size Max weight1 GB FormatsMP4MOV

Reddit Ads Video Ad (Promoted Video)

Text limits

Every value each platform uses for the field, characters unless noted

Field	Instagram	Reddit Ads
Headline	40	300
Primary text	44 · 125	—
Caption	—	50
Body	—	40000

Video side by side

Instagram

Feed Video (9:16) 1080×1920 · 9:16 · Max duration: 1 second to 60 minutes · 4 GB
Stories Video (9:16) 1440×2560 · 9:16 · Max duration: 1 second to 60 minutes · 4 GB
Reels Video (9:16) 1440×2560 · 9:16 · Max duration: 0 seconds to 15 minutes · 4 GB

Reddit Ads

Video Ad (Promoted Video) 1200×1200 · 1:1 (also 4:5, 4:3, 16:9 supported) · Max duration: Up to 15 minutes (5-30 seconds recommended; minimum 2 seconds) · 1 GB