# CapabilityBase — Developer Utility Knowledge Base

> Local-first, deterministic, open-source developer utilities designed for humans and AI agents. 100% client-side: no uploads, no tracking. All tools are callable via URL deep links.

## Tools
- [Base64 Converter](https://capabilitybase.com/tools/base64.html) — Text Base64 encode/decode plus image-to-DataURI conversion. All local.
  - Deep link params: ?text=, ?input=
- [Case Converter](https://capabilitybase.com/tools/case-converter.html) — Convert between camelCase, snake_case, PascalCase, kebab-case and more.
  - Deep link params: ?text=
- [Base64 Encode/Decode](https://capabilitybase.com/tools/encoding-base64.html) — Base64 encode/decode with URL-safe option.
- [Fullwidth Halfwidth Converter](https://capabilitybase.com/tools/fullwidth-halfwidth.html) — Convert between fullwidth (zenkaku) and halfwidth (hankaku) characters.
- [HTML to Image](https://capabilitybase.com/tools/html-to-image.html) — Convert HTML snippets to PNG images locally.
- [JSON Formatter & Repair](https://capabilitybase.com/tools/json-formatter.html) — Beautify, minify and validate JSON with configurable indentation.
  - Deep link params: ?input=, ?json=
- [JSON Repair](https://capabilitybase.com/tools/json-repair.html) — Fix broken JSON from AI output — comments, trailing commas, unquoted keys. Deterministic, local.
  - Deep link params: ?input=, ?json=
- [JSON Validate](https://capabilitybase.com/tools/json-validate.html) — Strict JSON syntax validation with position-aware errors.
  - Deep link params: ?input=
- [JWT Decoder](https://capabilitybase.com/tools/jwt-decoder.html) — Decode JWT header/payload locally — inspect claims, expiry, issuer. No uploads.
  - Deep link params: ?input=, ?jwt=
- [Lorem Ipsum Generator](https://capabilitybase.com/tools/lorem-ipsum.html) — Placeholder text in multiple languages and styles.
  - Deep link params: ?paragraphs=
- [Markdown Render](https://capabilitybase.com/tools/markdown-render.html) — Real-time Markdown to HTML rendering with sanitization.
  - Deep link params: ?text=
- [Markdown to HTML](https://capabilitybase.com/tools/markdown-to-html.html) — Export Markdown to HTML fragments, styled documents or full pages.
  - Deep link params: ?text=
- [Markdown to Image](https://capabilitybase.com/tools/markdown-to-image.html) — Render Markdown to a shareable PNG image, canvas-based, zero upload.
  - Deep link params: ?text=
- [Password Generator](https://capabilitybase.com/tools/password-generator.html) — Cryptographically secure random password generator.
  - Deep link params: ?length=
- [Remove Duplicate Lines](https://capabilitybase.com/tools/remove-duplicates.html) — Remove duplicate lines while preserving order.
  - Deep link params: ?text=
- [Remove Empty Lines](https://capabilitybase.com/tools/remove-empty-lines.html) — Delete blank and whitespace-only lines.
  - Deep link params: ?text=
- [Sort Lines](https://capabilitybase.com/tools/sort-lines.html) — Alphabetical, numeric and reverse line sorting with dedup.
  - Deep link params: ?text=
- [Case Converter (Text)](https://capabilitybase.com/tools/text-case-converter.html) — Batch case conversion for identifiers and keys.
  - Deep link params: ?text=
- [URL Encode/Decode](https://capabilitybase.com/tools/url-encode.html) — Percent-encoding and decoding for URLs and query strings.
  - Deep link params: ?text=, ?input=
- [UUID Generator & Validator](https://capabilitybase.com/tools/uuid-generator.html) — Generate UUID v1/v4/v7 in bulk and validate any UUID with version detection.
  - Deep link params: ?version=, ?count=
- [Token & Word Counter](https://capabilitybase.com/tools/word-counter.html) — Count tokens, words, characters and estimate API cost across GPT-4o, Claude, Gemini, DeepSeek.
  - Deep link params: ?text=

## Guarantees

- [Guarantees — CapabilityBase](https://capabilitybase.com/guarantees.html) — Deterministic output, no AI inference, no network access, browser executable, semantically versioned, verified by automated tests.

## Notes

- Every capability is deterministic: same input, same output, every time.
- No API key required. No server involved. Copy a URL, share a state.