Substack Character Limit (2026)
Quick Answer
Substack has no character or word limit for newsletter posts. However, the ideal Substack post is 1,000-2,000 words (5-10 minute read). Subject lines should be under 60 characters for best email open rates.
All Substack Character Limits
| Content | Recommendation |
|---|---|
| Post length | 1,000-2,000 words ideal |
| Subject line | Under 60 characters |
| Subtitle | Under 250 characters |
| Publication name | Under 40 characters |
| Bio | Under 250 characters |
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Open Word CounterFrequently Asked Questions
What is the Substack character limit?
The Substack character limit is No limit for standard posts. See the table above for limits on other content types like bios, usernames, and titles.
How do I check my Substack character count?
Use our free character counter tool. Paste your text and it instantly shows the character count. You can also check word count, sentence count, and reading time.