# Zimbra.Free

> A complete hub of free online tools and utilities — text conversion, AI generation, image editing, developer utilities, and email assistants — all in one place.

Zimbra.Free hosts dozens of single-purpose web tools that run in the browser. Many tools use AI for tasks like summarization, grammar checking, and email drafting; others are classic developer utilities (encoders, formatters, generators).

## Pages

- [Home](/): Tool directory and search

## Tools

- [Text Case Converter](/tools/text-case-converter): Convert text between uppercase, lowercase, title case
- [Password Generator](/tools/password-generator): Generate secure random passwords
- [Color Palette Generator](/tools/color-palette-generator): Build color palettes with hex/RGB
- [QR Code Generator](/tools/qr-code-generator): Create QR codes for URLs and text
- [AI Text Summarizer](/tools/ai-text-summarizer): Summarize long articles using AI
- [Image Compressor](/tools/image-compressor): Compress PNG/JPG images
- [JSON Formatter](/tools/json-formatter): Format and validate JSON
- [YouTube Thumbnail Downloader](/tools/youtube-thumbnail-downloader): Download YouTube thumbnails
- [Base64 Encoder/Decoder](/tools/base64-encoder-decoder): Base64 encode and decode
- [URL Encoder/Decoder](/tools/url-encoder-decoder): Encode and decode URLs
- [Word Counter](/tools/word-counter): Count words, characters, sentences
- [Lorem Ipsum Generator](/tools/lorem-ipsum-generator): Generate placeholder text
- [Hash Generator](/tools/hash-generator): Generate SHA hashes
- [UUID Generator](/tools/uuid-generator): Generate unique identifiers
- [Markdown Preview](/tools/markdown-preview): Live Markdown editor and preview
- [RegEx Tester](/tools/regex-tester): Test regular expressions
- [Text Diff Checker](/tools/text-diff-checker): Compare two texts
- [Timestamp Converter](/tools/timestamp-converter): Convert Unix timestamps
- [Slug Generator](/tools/slug-generator): Create SEO-friendly URL slugs
- [JWT Decoder](/tools/jwt-decoder): Decode JSON Web Tokens
- [ASCII/Emoji Art Generator](/tools/ascii-emoji-art): Generate ASCII and emoji art with AI
- [AI Email Writer](/tools/ai-email-writer): Draft emails with AI
- [Email Tone Adjuster](/tools/email-tone-adjuster): Adjust email tone
- [Email Subject Optimizer](/tools/email-subject-optimizer): Optimize email subject lines
- [Email Rewriter](/tools/email-rewriter): Rewrite emails with AI
- [Emoji Signature Enhancer](/tools/emoji-signature-enhancer): Add emoji to signatures
- [Email Summarizer](/tools/email-summarizer): Summarize long emails
- [Smart Reply Generator](/tools/smart-reply-generator): Generate quick email replies
- [AI Grammar Checker](/tools/ai-grammar-checker): Check grammar and spelling with AI