What is ClepBoard?
ClepBoard is a high-precision text sanitization utility engineered for developers, technical writers, and security-conscious professionals. When content flows through chat applications, PDFs, web scrapers, or LLM outputs, it often carries invisible Unicode characters, non-standard whitespace, curly quotes, and subtle homoglyphs — characters that look identical to standard ASCII but are entirely different code points. ClepBoard detects and eliminates all of it, producing clean, trustworthy plaintext ready for any downstream system.
The Auto-Clep Engine
The centrepiece of ClepBoard is the Auto-Clep engine — an intelligent multi-mode cleaning system that applies context-aware sanitization rules rather than blunt find-and-replace operations. AI mode targets the specific artefacts introduced by language model outputs: zero-width joiners, directional overrides, soft hyphens, and semantic Unicode substitutions commonly used in prompt injection attacks. Code mode strips invisible characters that can silently break tokenizers, parsers, and compilers — a notorious source of hard-to-debug production issues. Essay mode normalizes typographic characters, standardizes whitespace, and produces consistent copy-ready prose. Each mode preserves the intentional structure of the text while surgically removing everything that shouldn't be there.
Homoglyph Attack Detection
One of ClepBoard's most technically significant capabilities is proactive homoglyph attack detection. Homoglyphs are Unicode characters that are visually indistinguishable from common Latin letters — for example, the Cyrillic 'а' versus the Latin 'a'. They are used in phishing URLs, social engineering payloads, and adversarial prompt injections. ClepBoard's detection layer flags these substitutions and replaces them with their canonical equivalents, providing a layer of security that most text editors and clipboard managers entirely lack.
Clipboard Pad and Commands Hub
Beyond cleaning, ClepBoard includes a persistent Clipboard Pad — a lightweight, browser-local snippet manager that stores sanitized text for reuse across sessions without any cloud sync or account requirement. The Commands Hub provides a curated reference of copy-ready OS keyboard shortcuts and system commands, serving as a productivity accelerator for power users who live in the terminal and editor.
Architecture and Privacy
All text processing in ClepBoard happens entirely within the browser's JavaScript runtime. No text ever leaves the local machine — there are no API calls, no telemetry, and no logging of input content. This privacy-first, local-only architecture makes ClepBoard safe to use with sensitive data including source code, legal documents, API keys, and confidential correspondence.