Token Estimator
See how much of Claude's context window your content uses
What are tokens?
Tokens are chunks of text AI models process. One token ≈ 4 characters. Claude's context is 200K tokens (~500 pages). Paste your content here to check if it fits before running in Cowork.
- 1 token ≈ 4 characters
- 200K context (~500 pages)
- Paste to check before running
- Breakdown by section
Your text→Tokenizer→Token count→Context check
Paste text
Upload files or folder
.txt.csv.md.pdf.xlsx.docx
Drop files here or use the buttons below
0
Tokens
0
Characters
0
Words
0
Lines
Context window usage
~200 short email~5,000 10-page PDF~200,000 300-page book~1,000,000 full context window
0 / 1,000,000 tokens (0%)
How much is...?
| A short email | ~200 |
| A 1-page document | ~500 |
| 50-row spreadsheet | ~2,000 |
| 10-page PDF report | ~5,000 |
| 50-page contract | ~25,000 |
| 300-page book | ~200,000 |
| Full context window | 1,000,000 |