KeyTab is a privacy-first keyboard (IME) for Android, 100% Kotlin and free software (MIT). <b>File manager in the keyboard</b> Browse folders in tabs, navigate with back-stack and parent-navigation. Tapping a file inserts its path or opens it via a VIEW intent. Each tab remembers its own directory. Listing runs asynchronously, so large folders never freeze the UI. <b>Offline word prediction</b> An n-gram model (FrequencyWords de_50k, CC-BY-SA-4.0) with bigrams for next-word prediction, a self-learning user dictionary, prefix autocomplete, fuzzy correction (Damerau-Levenshtein) and case matching — all on-device. Export/Import lets you optimize suggestions with a local LLM. Your data never leaves the device. <b>Dynamic key sizing</b> Likely-next keys scale up to 1.21x (second grade 1.15x), unlikely neighbours down to 0.812x, driven by the current suggestion scores. Toggleable in settings. <b>Notes &amp; clipboard</b> An editor tab with save/load plus a persistent clipboard history (up to 50 entries) — tap an entry to insert it directly into the target field. <b>Keyboard features</b> Dedicated TAB key (great for Termux/SSH), shift/caps-lock, long-press popups for umlauts and special characters, accelerating backspace on long-press (250ms down to 30ms). <b>Privacy</b> No network permission. No analytics, no tracking, no data collection.