How does Bluesky count characters?

Bluesky measures post limits in graphemes rather than standard characters or UTF-16 code units. This means complex emojis, skin tones, and country flags are counted visually as single characters.

What is the maximum character limit on Bluesky?

The maximum post length is 300 graphemes (visual characters). In addition, the AT Protocol enforces a strict size limit of 3000 UTF-8 bytes per post.

Do links and URLs count towards the Bluesky character limit?

Yes, unlike Twitter/X where all links are shortened to 23 characters, Bluesky counts the full length of the URL in your post. Writing a long URL will consume your character limit in full.

How does the automated thread splitter work?

For drafts exceeding 300 graphemes or 3000 bytes, our tool automatically divides the text into sequential posts, searching backwards for natural breakpoints like line breaks, punctuation, or spaces to avoid splitting in the middle of a word or emoji.

🦋 AT Protocol Utility

Bluesky Grapheme Counter & Thread Splitter

Ensure your drafts fit the official AT Protocol limits. Automatically analyze emojis, track raw byte weight, highlight rich-text facets, and split text into sequential updates.

⚡ Quick Answer: How Graphemes are Calculated

Unlike other social platforms, the network measures text length in 300 graphemes (visual symbols) rather than raw string lengths, restricting drafts to a 3,000 UTF-8 byte limit. Emojis and accent letters count as a single unit. Additionally, URLs are counted in full.

Draft Composer

0 / 300

1s read 0 words ✅ Single post

Graphemes Limit: 300

0 / 300

UTF-8 Bytes Limit: 3000

0 / 3000

🦋 Bluesky Draft

Perfect Fit 0 / 300

𝕏 Twitter / X Draft

Compatible 0 / 280

* URLs are wrapped to 23 symbols on Twitter/X

🧵 Threads Draft

Compatible 0 / 500

🐘 Mastodon Draft

Compatible 0 / 500

* Mastodon uses 500 graphemes; URLs are always counted as 23 symbols

👁️ Facets Highlight Preview

Real-time parsed links, @mentions, and #hashtags will highlight here as you type.

Understanding AT Protocol Limits

Why graphemes and data sizes behave differently on decentralized networks.

🛡️ Grapheme Segmentation

In standard JavaScript, text.length counts UTF-16 code units. This means a flag emoji like 🇺🇸 has a length of 4, and an emoji like 👨‍👩‍👧 has a length of 8. The network uses Intl.Segmenter to resolve visual symbols. The emoji 👨‍👩‍👧 counts as exactly 1 grapheme.

💾 UTF-8 Byte Weight

While length is counted in graphemes, the underlying network packet of the AT Protocol limits a draft to exactly 3,000 UTF-8 weight. Normal English letters consume 1 byte each, while complex emojis and special symbols can consume up to 4 bytes of data.

🔗 Links and URL Facets

Unlike Twitter/X which wraps links to a uniform 23 letters, this platform does not use a built-in link wrapper. The entire length of the URL text is counted against the 300 grapheme limit. Writing a 100-symbol URL leaves you with only 200 symbols for the rest of your draft.

✂️ Smart Thread Splitter

When you compose text longer than the limit, our engine scans backward from the threshold to split the text at spaces, newlines, or sentence ends. This preserves readability and guarantees that your emojis and multi-byte symbols never break.

Frequently Asked Questions

How does the network count text length?

The platform measures draft limits in visual graphemes using the browser's native Internationalization API (Intl.Segmenter). This guarantees that accents, skin tone modifiers, and multi-symbol emojis are calculated as a single unit.

Do links count in full on the network?

Yes. Any HTTP or HTTPS link is parsed as a rich-text facet and remains fully visible in the draft text, thus counting towards the 300 symbol limit in full. Using short links or threading is recommended for long URLs.

What happens if a draft exceeds 3,000 bytes?

If your draft exceeds 3,000 UTF-8 bytes, the server will reject it even if the grapheme count is under the limit. This commonly occurs if the text contains an excessive number of emojis or foreign language letters, which take more space to store.

Is my draft content private?

Absolutely. This tool is built as an Astro static site, and all character calculations, facet parsing, and thread-splitting occur entirely inside your browser's local sandbox. No data is sent to a server.