Knowledge Center
Technical Specifications Guide Supported by Retm
Comprehensive and updated guide for content specifications and technical limitations for all social media platforms supported in Retm.
Quick Reference - Key Sizes
| Platform | Images | Videos | Reels/Shorts | 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 |
- | - |
| TikTok Business | 9:16, 1:1 1080×1920 |
9:16 1080×1920 |
- | - |
| 1.91:1 1200×627 |
16:9, 1:1 1920×1080 |
- | - | |
| YouTube | - | 16:9, 9:16 1920×1080 / 4K |
- | - |
| Telegram | All ratios 1280×1280 |
All ratios 1920×1080 |
- | - |
| Google Business | 4:3 1200×900 |
- | - | - |
| YouTube Shorts | - | - | 9:16 1080×1920 |
- |
Detailed Specifications
| Platform | Text Only | Characters | Notes |
|---|---|---|---|
| ✓ | 63,206 characters | Does not support mixed files (video with image) | |
| ✗ | 2,200 characters | Requires image/video, Carousel supports up to 10 mixed files | |
| Threads | ✓ | 500 characters | Carousel supports up to 20 mixed files |
| X (Twitter) | ✓ | 280 characters | URLs count as 23 characters, Emojis count as 1 character |
| X Premium | ✓ | 25,000 characters | URLs count as 23 characters |
| TikTok | ✗ | 2,200 characters | Requires video or image, up to 35 images, does not support mixed files |
| TikTok Business | ✗ | 2,200 characters | Business account, requires video or image |
| ✓ | 3,000 characters | Supports PDF (20MB, 100 pages), does not support mixed files | |
| YouTube | ✗ | Title: 100 chars, Description: 5,000 chars | Requires video, Shorts for short content |
| Telegram | ✓ | 4,096 characters | Supports text messages and multimedia |
| Google Business | ✓ | 1,500 characters | For posts, updates, and offers |
| Platform | Formats | Size | Ratio | Resolution | Count |
|---|---|---|---|---|---|
| JPEG, JPG, PNG | 10 MB | All aspect ratios | 1080×1350 | Unlimited | |
| JPEG, JPG, PNG, GIF | 8 MB | 4:5 to 1.91:1 | 1080×1350 | Up to 10 images | |
| Threads | JPEG, JPG, PNG, GIF | 8 MB | 1:10 to 10:1 | 1080×1080 | Up to 20 images |
| X (Twitter) | JPG, PNG | 5 MB | All aspect ratios | 1200×675 | Up to 4 images |
| X Premium | JPG, PNG | 5 MB | All aspect ratios | 1200×675 | Up to 4 images |
| TikTok | JPEG, JPG | 20 MB | 9:16 to 1:1 | 1080×1920 | Up to 35 images |
| TikTok Business | JPEG, JPG | 20 MB | 9:16 to 1:1 | 1080×1920 | Up to 35 images |
| JPEG, JPG, PNG | 20 MB | 1.91:1 (Recommended) | 1200×627 | Up to 20 images | |
| Telegram | JPEG, JPG, PNG, GIF, WebP | 10 MB | All aspect ratios | 1280×1280 | Up to 10 images |
| Google Business | JPEG, JPG, PNG | 5 MB | 4:3 (Recommended) | 1200×900 | Up to 10 images |
| Platform | Format | Size | Duration | Ratio | Resolution | Cover |
|---|---|---|---|---|---|---|
| MP4 | 2 GB | 240 minutes | 16:9 or 1:1 | 1920×1080 | Available (10 MB) | |
| MP4 | 300 MB | 15 minutes | 9:16 to 16:9 to 1:1 (Prefer 9:16) |
1080×1920 | Available (8 MB) | |
| Threads | MP4 | 500 MB | 5 minutes | 1:10 to 10:1 | 1080×1920 | Not supported |
| X (Twitter) | MP4, MOV | Video: 512 MB GIF: 15 MB |
0.5 - 140 seconds | All aspect ratios | 1920×1080 | Available |
| X Premium | MP4, MOV | Video: 4 GB GIF: 15 MB |
4 hours | All aspect ratios | 1920×1080 | Available |
| TikTok | MP4 (Recommended) | 1 GB | 10 minutes | 9:16 (Vertical) | 1080×1920 | From video |
| TikTok Business | MP4 (Recommended) | 1 GB | 10 minutes | 9:16 (Vertical) | 1080×1920 | Available (image or from video) |
| MP4, MOV, AVI | 75 KB - 500 MB | 10 minutes | 16:9 to 1:1 | 1920×1080 | Available (10 MB) | |
| YouTube | MP4, MOV, AVI, WebM | 4 GB | 12 hours | 16:9 (Landscape) or 9:16 (Shorts) | 1920×1080 or 3840×2160 (4K) | Available (2 MB) |
| Telegram | MP4, MOV | 50 MB | Unlimited | All aspect ratios | 1920×1080 | From video |
| Platform | Format | Size | Duration | Ratio | Resolution |
|---|---|---|---|---|---|
| MP4 | 2 GB | 3 seconds - 90 seconds | 9:16 | 1080×1920 | |
| MP4 | 300 MB | 15 minutes | 9:16 or 16:9 or 1:1 (Prefer 9:16) | 1080×1920 | |
| YouTube Shorts | MP4, MOV, WebM | 4 GB | 1 second - 60 seconds | 9:16 (Vertical) | 1080×1920 |
Stories - Video
| Platform | Format | Size | Duration | Ratio | Resolution |
|---|---|---|---|---|---|
| MP4 | 2 GB | Less than 60 seconds | 9:16 | 1080×1920 | |
| MP4 | 100 MB | Less than 60 seconds | 9:16 (Vertical - Recommended) |
1080×1920 |
Stories - Images
| Platform | Formats | Size | Ratio | Resolution |
|---|---|---|---|---|
| JPEG, PNG, GIF | 4 MB | 9:16 (Recommended) | 1080×1920 | |
| JPEG, JPG, PNG, GIF | 8 MB | 9:16 (Recommended) | 1080×1920 |
Common Aspect Ratios
9:16
Vertical
1080×1920
4:5
Portrait
1080×1350
1:1
Square
1080×1080
16:9
Landscape
1920×1080
Important Notes
Important Notes:
- Maximum file size in Retm platform: 4GB 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)