Prompt Workbox
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Prompt WorkboxPrompt Workbox

Craft, test and version your prompts locally.

Build, edit, compare and organize LLM prompts locally in browser. ChatML editor, variable templates, token checker, all data stays on your device.

Open EditorOpen TokenWorkboxImport from MDWorkboxRead the blog

To carry the current prompt into TokenWorkbox, open the Editor (or Cleaner) and use “Send to TokenWorkbox”.

Your prompts never leave your browser.

All processing for core tools runs locally in your browser. Privacy policy

Why Prompt Workbox

Local-first prompts

All prompt editing runs in your browser. Your prompts never leave your device.

Prompt engineering tools

Editor, templates, cleaning, export, and token checks — built for RAG and Agent workflows.

Guides & updates

Product notes and practical tips live on the blog — no account required to read.

Part of the Workbox series

Pairs with MDWorkbox and TokenWorkbox for a full local prompt → token pipeline.

Tools

Prompt Editor

Ready

Local text & ChatML editor with live token counts and draft autosave.

Prompt Templates

Ready

Built-in and local custom templates with variable placeholder replacement.

Version Snapshots

Ready

Manually save prompt versions with labels, tokens, and diff compare.

A/B Compare

Ready

Side-by-side prompt editing with independent token counts and ChatML export.

Variable Batch Test

Ready

Fill a multi-row variable table, batch-replace placeholders, and preview prompts.

Hello Demo Tool

Ready

Minimal ToolPageShell example for forking new tools.

Utilities

Prompt Cleaner

Ready

Clean whitespace, strip markup, escape for JSON, or compress prompts locally.

Prompt Linter

Ready

Static checks for placeholders, length, missing system, JSON fragments, and redundancy.

Prompt Import

Ready

Import ChatML JSON, ChatGPT copy-paste, or Markdown multi-turn into the editor.

Coming Soon Example

Placeholder tool page pattern.

FAQ

Does my prompt get uploaded?
No. Prompt processing stays in your browser by default. Drafts use localStorage on your device.
Is this a ChatGPT chat site?
No. Prompt Workbox is a prompt engineering workbench — edit, template, clean, compare, and export — not a hosted chatbot.
How do I send a prompt to TokenWorkbox?
Open the Editor or Cleaner, then use “Send to TokenWorkbox”. The current prompt is carried across so you can run Exact counts, cost estimates, and chunking.

Registered tools: 10