Character budget from token cap

Client

Enter a target token budget; get a matching maximum character count using the same token estimate heuristic. Use long text chunker when you must split prose across multiple messages.

Honest limits

We compute floor(tokens × chars/token) so the reciprocal ceil(chars ÷ chars/token) stays at or below your token target in this toy model. Your provider’s tokenizer can still disagree by a noticeable margin.

Token ceiling

?

We use the same ceil(chars ÷ chars/token) shortcut as the token estimate page. The max character value is floor(tokens × chars/token) so that shortcut stays at or below your token target—still not a real tokenizer.

Planner output

≤ 32,768 characters

Same heuristic would count ~8,192 tokens at that length (should not exceed 8,192).

Chars per token

Optional sample text drives auto mode (CJK ratio). Switch to manual for a fixed chars/token value. Agents share links with ?tokens=… and optional &cpt=…; optional q / qb prefill this sample.

Sample CJK ratio
0.0%
Suggested chars/token (auto)
4.00
Sample words (whitespace)
18

Common use cases

  • You know a model context limit in tokens and want a safe character ceiling before drafting a single paste.
  • Match the workflow from the token estimate page in reverse—keep auto vs manual chars/token aligned between both tools.
  • Share a planning link with ?tokens=8192 and optional &cpt=4 for teammates or agents.

Common mistakes to avoid

  • Treating the number as exact for billing or API limits

    Hosting APIs use their own tokenizers. This output is for rough drafting and browser-side planning only.

  • Ignoring embeddings or tool-use overhead

    Reserved tokens for system prompts, tools, or retrieval are not modeled here—lower your target manually.

FAQ

Does anything leave my browser?

No. The math runs in JavaScript on your device.

How is this different from the token estimate tool?

That page scores your pasted text. This one picks a character cap from a token target and the same heuristic ratio.

Common search terms

Phrases people search for that match this tool. See the full long-tail keyword index.

  • token cap to character limit llm
  • max characters for token budget
  • context window chars from tokens

More tools

Related utilities you can open in another tab—mostly client-side.