Social Media Character Limits (2026)
Every text field limit you need to know: captions, bios, titles, descriptions, hashtags, and alt text across all 9 platforms.
IG Instagram
| Field | Limit | Visible Before Truncation |
|---|---|---|
| Caption | 2,200 | 125 chars in feed |
| Bio | 150 | Full |
| Username | 30 | Full |
| Hashtags per post | 30 | Count within caption limit |
| Alt text | 100 | Full |
| Comment | 2,200 | Full |
TT TikTok
| Field | Limit | Notes |
|---|---|---|
| Caption | 4,000 | Includes hashtags |
| Bio | 80 | Full |
| Username | 24 | Letters, numbers, underscores |
| Comment | 150 | Full |
YT YouTube
| Field | Limit | Notes |
|---|---|---|
| Title | 100 | Truncated at ~70 in search |
| Description | 5,000 | First 150 chars shown |
| Tags | 500 | Total characters across all tags |
| Channel Name | 100 | Full |
| Comment | 10,000 | Full |
FB Facebook
| Field | Limit | Notes |
|---|---|---|
| Post | 63,206 | Truncated at ~477 chars |
| Page Bio | 255 | Full |
| Page Name | 75 | Full |
| Comment | 8,000 | Full |
| Reel Caption | 2,200 | Same as Instagram |
X X (Twitter)
| Field | Limit | Notes |
|---|---|---|
| Post | 280 | 25,000 with Premium |
| Bio | 160 | Full |
| Display Name | 50 | Full |
| Username | 15 | @handle |
| URL in post | 23 | All URLs count as 23 chars |
in LinkedIn
| Field | Limit | Notes |
|---|---|---|
| Post | 3,000 | Truncated at ~140 in feed |
| Article | 125,000 | Long-form articles |
| Headline | 220 | Profile headline |
| About | 2,600 | Profile summary |
| Comment | 1,250 | Full |
@ Threads
| Field | Limit | Notes |
|---|---|---|
| Post | 500 | Full |
| Bio | 150 | Synced from Instagram |
| Reply | 500 | Same as post |
P Pinterest
| Field | Limit | Notes |
|---|---|---|
| Pin Title | 100 | First 30-40 chars shown |
| Pin Description | 500 | First 50 chars in feed |
| Board Name | 50 | Full |
| Board Description | 500 | Full |
| Bio | 500 | Full |
BS Bluesky
| Field | Limit | Notes |
|---|---|---|
| Post | 300 | Grapheme clusters, not bytes |
| Display Name | 64 | Full |
| Bio | 256 | Full |
| Alt Text | 2,000 | Per image |