Library
Technical Specifications Guide Supported by Retm
In the world of social media, correct sizes and dimensions play a crucial role in your content's success. Each platform has its own requirements, and knowing these specifications ensures your content appears in the best possible quality across all devices.
Whether you're a professional designer, content creator, or managing your personal accounts, this comprehensive guide provides all updated sizes and specifications for the most popular social media platforms in one place.
Quick Reference - Key Sizes
| Platform | Images (Post) | Videos (Post) | Reels | Stories |
|---|---|---|---|---|
| All ratios 1080×1350 |
16:9 or 1:1 1920×1080 |
9:16 1080×1920 |
9:16 1080×1920 |
|
| 4:5 to 1.91:1 1080×1350 |
9:16 1080×1920 |
9:16 or 16:9 or 1:1 1080×1920 |
9:16 1080×1920 |
|
| Threads | 1:10 to 10:1 1080×1080 |
1:10 to 10:1 1080×1920 |
- | - |
| X (Twitter) | All ratios 1200×675 |
All ratios 1920×1080 |
- | - |
| X Premium | All ratios 1200×675 |
All ratios 1920×1080 |
- | - |
| TikTok | 9:16, 1:1 1080×1920 |
9:16 1080×1920 |
- | - |
| 1.91:1 1200×627 |
16:9, 1:1 1920×1080 |
- | - |
For more details, select content type below
Detailed Specifications by Content Type
Browse complete specifications by content type you want to publish. Each category includes supported formats, maximum sizes, aspect ratios, and recommended resolution to ensure best display quality.
| Platform | Text Only Post | Character Count | Notes |
|---|---|---|---|
| ✓ Available | 63,206 characters | Does not support mixed files (video with image) | |
| ✗ Not Available | 2,200 characters | Requires image/video, Carousel supports up to 10 mixed files | |
| Threads | ✓ Available | 500 characters | Carousel supports up to 20 mixed files |
| X (Twitter) | ✓ Available | 280 characters | URLs count as 23 characters, Emojis count as 1 character |
| X Premium | ✓ Available | 25,000 characters | URLs count as 23 characters |
| TikTok | ✗ Not Available | 2,200 characters | Requires video or image, up to 35 images, does not support mixed files |
| ✓ Available | 3,000 characters | Supports PDF (20MB, 100 pages), does not support mixed files |
| Platform | Supported Formats | Max Size | Aspect Ratio | Recommended Resolution | Number of Images | Additional Info |
|---|---|---|---|---|---|---|
| JPEG, JPG, PNG | 10 MB | All aspect ratios | 1080×1350 | Unlimited | Does not support mixed files | |
| JPEG, JPG, PNG, GIF | 8 MB | 4:5 to 1.91:1 | 1080×1350 | Up to 10 images | Carousel supports mixed files | |
| Threads | JPEG, JPG, PNG, GIF | 8 MB | 1:10 to 10:1 | 1080×1080 | Up to 20 images | Supports up to 20 mixed files |
| X (Twitter) | JPG, PNG | 5 MB | All aspect ratios | 1200×675 | Up to 4 images | Supports 4 images or 1 video or 4 GIFs |
| X Premium | JPG, PNG | 5 MB | All aspect ratios | 1200×675 | Up to 4 images | Same as basic account limits |
| TikTok | JPEG, JPG | 20 MB | 9:16 to 1:1 | 1080×1920 | Up to 35 images | From 360 to 4096 pixels (width and height), does not support mixed files |
| JPEG, JPG, PNG | 20 MB | 1.91:1 (Recommended) | 1200×627 | Up to 20 images | Does not support mixed files |
| Platform | Format | Max Size | Max Duration | Aspect Ratio | Recommended Resolution | Additional Info | Cover Image |
|---|---|---|---|---|---|---|---|
| MP4 | 2 GB | 240 minutes | 16:9 or 1:1 | 1920×1080 | Does not support mixed files | Available (10 MB) | |
| MP4 | 300 MB | 15 minutes | 9:16 to 16:9 to 1:1 (Prefer 9:16) |
1080×1920 | Single video is treated as Reel automatically, Carousel supports 10 mixed files | Available (8 MB) | |
| Threads | MP4 | 1 GB | 5 minutes | 1:10 to 10:1 | 1080×1920 | Supports up to 20 mixed files | Not supported |
| X (Twitter) | MP4, MOV | Video: 512 MB GIF: 15 MB |
0.5 - 140 seconds | All aspect ratios | 1920×1080 | 4 images or 1 video or 4 GIFs | Not supported |
| X Premium | MP4, MOV | Video: 512 MB GIF: 15 MB |
10 minutes | All aspect ratios | 1920×1080 | Other limits same as basic account | Available (5 MB) |
| TikTok | MP4 (Recommended) | 4 GB | 10 minutes | 9:16 (Vertical) | 1080×1920 | From 360 to 4096 pixels (width and height), does not support mixed files | From video |
| MP4, MOV, AVI | 75 KB - 500 MB | 10 minutes | 16:9 to 1:1 | 1920×1080 | Does not support mixed files | Available (10 MB) |
Note: In Instagram, a single video is automatically treated as a Reel
| Platform | Format | Max Size | Duration | Aspect Ratio | Resolution | Additional Info |
|---|---|---|---|---|---|---|
| MP4 | 2 GB | 3 seconds - 90 seconds | 9:16 | 1080×1920 | Minimum: 540×960 pixels, cover image 10 MB | |
| MP4 | 300 MB | 15 minutes | 9:16 or 16:9 or 1:1 (Prefer 9:16) | 1080×1920 | Thumbnail offset supported, JPEG cover image 8 MB |
Note: Reels are currently available on Facebook and Instagram
| Platform | Format | Max Size | Duration | Aspect Ratio | Resolution | Additional Info |
|---|---|---|---|---|---|---|
| MP4 | 2 GB | Less than 60 seconds | 9:16 | 1080×1920 | Minimum: 540×960 pixels | |
| MP4 | 100 MB | Less than 60 seconds | 9:16 (Vertical - Recommended) |
1080×1920 | - |
Note: Stories (video) are currently available on Facebook and Instagram
| Platform | Supported Formats | Max Size | Aspect Ratio | Recommended Resolution | Additional Info |
|---|---|---|---|---|---|
| JPEG, PNG, GIF | 4 MB | 9:16 (Recommended) | 1080×1920 | - | |
| JPEG, JPG, PNG, GIF | 8 MB | 9:16 (Recommended) | 1080×1920 | - |
Note: Stories are currently available on Facebook and Instagram
Most Common Aspect Ratios
Important Notes
Important Notes:
- Maximum file size in Retm platform: 500MB for videos and images
- Some platforms do not support mixed files (images + video in one post): such as Twitter (X), TikTok, LinkedIn, Facebook
- Platforms supporting mixed files: Instagram (up to 10 files), Threads (up to 20 files)
- Instagram: Single video is automatically treated as Reels
Understanding Aspect Ratios and Pixel Resolution:
Aspect Ratio:
- 9:16 = Vertical (suitable for mobile and stories)
- 16:9 = Horizontal (suitable for videos and wide screens)
- 1:1 = Square (suitable for images)
- 4:5 = Light vertical (suitable for Instagram)
Pixel Resolution:
- 1920×1080 = Full HD horizontal
- 1080×1920 = Full HD vertical
- 1:1 = Square at 1080×1080 pixels
- Minimum: 360px, Maximum: 4096px (both dimensions)