Who should use Claude Tokenizer?

Claude Tokenizer is a B2B product built for AI developers.

Is Claude Tokenizer free?

Yes — Claude Tokenizer is free to use.

What platforms does Claude Tokenizer run on?

Claude Tokenizer runs on the web.

Is Claude Tokenizer still maintained?

Unverified. Claude Tokenizer has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.

Who develops Claude Tokenizer?

Claude Tokenizer is developed by Rob Kopel.

How long has Claude Tokenizer been around?

Claude Tokenizer first shipped in 2025.

Back to the index

Claude Tokenizer

Name: Claude Tokenizer
Author: Rob Kopel

robkopel.meOther AI

Claude Tokenizer is a web-based tool that allows users to see exactly how Anthropic's Claude model splits input text into tokens. It helps AI developers and prompt engineers optimize their prompts for efficiency and cost by visualizing token boundaries and supporting different Claude model versions.

FreeWeb

Visit robkopel.me

Overview

3 features

Claude Tokenizer is an Other AI project. It helps users understand and optimize prompt tokenization for Claude models by visualizing token boundaries. Claude Tokenizer is a B2B product aimed at AI developers. Claude Tokenizer costs nothing to use. It runs on the web.

Behind Claude Tokenizer is Rob Kopel, and it first shipped in 2025. Among its 3 catalogued features are token visualization, prompt optimization, and model selection.

Summary written by a language model from the project’s public pages.

Token visualization
Prompt optimization
Model selection

Built with & integrations

Framework

Next.js

Hosting

Vercel

AI providers

anthropic

Runs on

Browser

Detected from

Next.js: x-nextjs-prerender header · /_next/static/ in the HTML · __next_f in the HTML
Vercel: x-vercel-id header · x-vercel-cache header
anthropic: bclaude in the HTML · bclaude- in the HTML

Trust & compliance

Verified signals

HTTPSFree tier

Indexing history

What PulseGate has recorded for this listing

Indexed25 Jun · 16:38 UTC
Listing verified against its public source
Source: PulseGate · Open

Frequently asked questions about Claude Tokenizer

What does Claude Tokenizer do?: Claude Tokenizer helps users understand and optimize prompt tokenization for Claude models by visualizing token boundaries. It is catalogued under Other AI on PulseGate.
Who should use Claude Tokenizer?: Claude Tokenizer is a B2B product built for AI developers.
Is Claude Tokenizer free?: Yes — Claude Tokenizer is free to use.
What platforms does Claude Tokenizer run on?: Claude Tokenizer runs on the web.
Is Claude Tokenizer still maintained?: Unverified. Claude Tokenizer has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.
Who develops Claude Tokenizer?: Claude Tokenizer is developed by Rob Kopel.
How long has Claude Tokenizer been around?: Claude Tokenizer first shipped in 2025.

At a glance

Platforms: Web
Languages: English
Built for: AI developers
Model: B2B
Solves: Helps users understand and optimize prompt tokenization for Claude models by visualizing token boundaries.

Developer

Rob Kopel

Index record

Indexed: 25 Jun 2026
Lifecycle: Alive
Last seen: 25 Jun 2026

Identity audit (12)

Slug: claude-tokenizer-robkopel-me
Lifecycle last checked: 9 Sept 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 25 Jun 2026
Timeline basis: Indexed-at chronology. This listing's first-seen date was written by the catalog backfill, not observed here, so it is not treated as a sighting.
Name from: Derived from the project's own page and URL.
Category from: Recorded source: taxonomy-pass-b.
Summary from: Written by a language model from public pages.
Languages from: Detected by a language model, checked against the page's own declaration.
Canonical URL: https://tokenizer.robkopel.me/

Ship this? Send a correction — no account, and you get a link to follow it.

Similar projects

Closest matches by what these projects do

Claude Token Countervisualstudio.com