Token and text tools
Counting, splitting, budgeting and comparing text in the unit you are billed in — every calculation in your browser, every estimate labelled as one.
Token Counter
Paste text and get a script-aware token estimate, a full character breakdown, and an honest account of how far off the estimate is likely to be.
Token Segment Visualiser
Colours your text by the character classes that drive its token count, so you can see which part — indentation, digits, emoji, non-Latin script — is doing the damage.
Tokenizer Comparison Sheet
Put the token counts your own models reported for one piece of text side by side, with characters per token and the monthly cost of the gap between them.
Words to Tokens Converter
Converts a word count into tokens using a ratio derived from your own text, rather than the single constant every other converter uses.
Characters to Tokens Converter
Converts characters into tokens at a ratio measured on your own text, and shows how wrong the familiar four-characters-per-token rule would be for it.
Context Fit Checker
Reserves space for the answer first, then tells you how much of the context window is left for your prompt — or exactly how many tokens over you are.
Prompt Size Analyser
Splits a prompt into system, tool schemas, history and the user turn, and shows what each part costs per call and per month.
Conversation Token Tracker
Paste a transcript and see what the whole conversation was billed, including the history re-sent on every single turn.
Token Cost per Language
Put the same sentence in two languages side by side and see the token difference, the mechanism behind it, and what it costs you per month.
Chunk Size Calculator
Document size, chunk size and overlap in; chunk count, total tokens stored, the storage amplification and the embedding cost out.
Text Chunker
Split your own text four different ways and read the actual chunks, with the overlap arithmetic shown.
Prompt Truncator
Fit a prompt to a token budget by one of four strategies, and see exactly which text was removed.
System Prompt Token Cost
What your system prompt costs per request, per million requests and per month, at your own rates.
Tool Schema Token Cost
Paste your tool definitions and see the per-call token overhead, broken down tool by tool.
Context Window Visualiser
Enter any limits you like and see the system prompt, tools, documents, history and output reservation drawn to scale.
Prompt Diff and Cost Delta
Diff two prompts line by line and price the difference per call, per million calls and per month.
Cache Prefix Analyser
Paste two prompts and find the exact character where they stop being identical — the boundary that decides a cache hit.
Message History Trimmer
Paste a transcript and preview what four different trimming strategies keep and what they throw away.
API Usage Response Parser
Paste a response body, get the usage fields pulled out and costed at your own rates.
Corpus Token Counter
Point at a folder and get an estimated token total, broken down by folder, by extension and by largest file.
JSONL Dataset Token Counter
Paste or load a JSONL training file and get an estimated token count per example and for the whole file, with the training cost at your own rate.
Multi-Turn Cost Simulator
Simulates a chat conversation turn by turn to show how re-sending the history makes the input bill grow with the square of the turn count.
Prompt Compression Preview
Applies six deterministic compression rules to a prompt and lists exactly what each one removed, with the estimated tokens and monthly cost saved.
Text Statistics for AI
Characters, words, sentences, syllables, reading level, character entropy and an estimated token count for any text you paste.
Whitespace and Formatting Cost
Put the same content in two forms — pretty-printed and minified, markdown and plain — and see the estimated token difference and what it costs per month.
Table Format Token Comparison
Renders your own table as CSV, TSV, markdown and three JSON shapes, and ranks them by estimated tokens at whatever row count you actually have.
Unicode and Emoji Token Cost
Counts graphemes, code points and UTF-8 bytes exactly for any text, and shows the token range those bytes imply for a byte-level tokenizer.
Code Token Counter
Estimates the tokens in pasted code or in source files you load, with tokens per line and bytes per token broken down by file extension.
Diff Token Counter
Parses a unified diff and estimates its tokens three ways: the whole patch, the changed lines only, and the changed lines without context.
Repository Token Estimator
Point the browser at a folder and get an estimated token map by directory and file type, plus how many context windows the codebase would fill.
Log Sampler for Analysis
Draw a reproducible random sample from a large log file, with the sample size derived from the precision you need.
Text Deduplicator
Find exact and near-duplicate records in pasted text, with the similarity measure and the threshold both in your hands.
Sentence Splitter
Split text into sentences with an abbreviation list you can see and extend, and length statistics for the chunks it produces.
Reading Time and Token Time Estimator
Turn an output size and your own measured token rate into a wall-clock estimate, and compare it against how fast a person reads.
Truncation Point Finder
Check an output for the structural signs of a cut — unbalanced JSON, an open code fence, a half-written character — against the finish_reason you were given.
Stop Sequence Tester
See exactly where your stop strings fire in a sample output, which one wins, and what the API would return.
Prompt Whitespace Normaliser
Inventory the invisible characters in a prompt — code point by code point — and clean the ones you choose to.
Language Detector
Identify the language of a snippet from its script and its function words, with the evidence for the guess printed next to it.
Text Anonymiser
Replace emails, cards, IBANs, IPs and phone numbers with stable tokens in the browser, and put them back afterwards.
Token Cheat Sheet
A one-page token and cost reference that fills itself in from your own ratios, rates and context limits.