Limits
Every number here is a real, enforced ceiling. Most of them you will never meet — they exist to keep pages readable and refreshes fast, not to ration anything. The ones worth planning around are called out as you go.
Notes
| Limit | |
|---|---|
| Note text | 32,000 characters (roughly 5,000 words) |
| Attachments | 10 MB per file, 10 files per note |
| Comment | 4,000 characters |
The note cap is the one you're most likely to hit, and it's deliberate: long notes summarize badly and read badly. Attach the full document and write a summary as the note, or split it into several notes — AI reconnects them when it builds a page. [1] has the reasoning and explains what AI can and can't see inside an attachment.
Pages
| Limit | |
|---|---|
| Title | 1,000 characters |
| Instructions | 32,000 characters |
| Notes read per refresh | about 180,000 characters of note text |
| Written per refresh | about 32,000 tokens — roughly 24,000 words |
| Total page content | 128,000 characters |
| Pages per space | about 50 |
Notes read per refresh. When the notes attached to a page add up to more than AI can read in one pass, the oldest are left out and a line at the top of the page says so. Everything else about the page is unaffected — no links are lost, and the excluded notes come back if the page later gets smaller.
Written per refresh. A single refresh writes at most ~24,000 words. This is far more than a page anyone reads end to end, and a page that genuinely needs more is a page that wants splitting. If a refresh does run into the ceiling it fails rather than handing back half a document, and the page keeps its previous content until the next successful refresh.
Both are symptoms of the same thing — a page trying to cover too much. Three fixes, in order of how well they work:
- Narrow the page. Tighten the instructions to a specific angle rather than everything.
- Split it. Instead of one "Work Projects" page, make one per project. Notes can feed several pages, so nothing gets duplicated.
- Remove less relevant notes so AI concentrates on what matters.
Pages per space. Beyond roughly 50, a page can fall outside the search AI uses to find candidates, and a legitimately related note may quietly lose its link. Pinned notes are never affected. If you're near the limit, prefer fewer, broader pages — or a separate group.
See [2] for how pages work, and [3] for what a refresh costs.
Groups
A group holds 30 members, counting the owner — so an owner can invite 29 others. There is no limit on how many groups you belong to, or on how many notes and pages a group holds.
History
Notes and pages keep their last 5 versions for 30 days. A version is written when the content itself changes — for a page that means its text, so editing only the title or the instructions doesn't create one.
Very large pages keep fewer than 5. History is capped by total size as well as by count, and when a page's content is long, older versions are dropped early to make room for the newest one. The current version is never affected.
Anything else
The API enforces the same note and page limits as the website: a write over any of them comes
back as 413 content_too_large rather than being quietly trimmed. [4] lists the rest
of the error codes.
Questions about a limit that isn't here? Ask via the chat button, or email mikipage@knowsun.com.