ZZTools - Free Online Tools
Private • Instant — Your essential online toolbox
Browse All Tools100% Private
All processing happens locally in your browser. Your files never leave your device. We don't store, transmit, or access your data.
Always Free
No sign-up required to use all core tools. No downloads or installation needed.
Simple & Fast
Minimal design, instant access. Tools run directly in your browser — no downloads, no installation, zero wait time.
All Tools
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AQHI to AQI Converter
Convert AQHI (Canada) to AQI (US EPA) free online using PM2.5 as the common reference. Bidirectional conversion with PM2.5 values shown. Runs in your browser.
Arabic Tashkeel Generator
Add Arabic diacritical marks (Harakat) to any Arabic text free online. Features pronunciation guide and Latin transliteration. Perfect for learners and teachers. 100% private.
Base64 Encoder & Decoder
Encode text to Base64 or decode Base64 strings free online. Supports UTF-8 (emoji & multilingual), URL-safe variant and MIME line wrap. 100% private — runs in your browser.
Chinese Name Generator
Free online Chinese name generator. Choose a surname and gender to get authentic names with pinyin and character meanings. 100% private — runs locally.
Chinese Zodiac Calculator
Free Chinese zodiac calculator. Enter your birthday to find your zodiac animal, compatibility, five elements, lucky numbers and colors. Accurate 1900-2100. 100% private.
Compress HEIC to 100KB
Compress HEIC photos from iPhone to exactly 100KB online free. Convert HEIC to JPG while reducing size for forms, uploads and email attachments. Private, no upload.
Compress HEIC to 50KB
Compress HEIC photos to 50KB online free. Reduce iPhone HEIC image size for visa applications, ID photos and web uploads. Browser-based, no upload.
Compress Image to 100KB
Compress JPG, PNG or WebP images to exactly 100KB online free. Reduce photo size to 100KB for forms, portals and email — no upload, no quality loss, fully private.
Compress Image to 20KB
Compress images to exactly 20KB online free. Reduce JPG, PNG or WebP file size to 20KB for exam forms, signatures and strict portals — instant, in-browser, no upload.
Compress Image to 50KB
Compress photos to exactly 50KB online free. Shrink JPG, PNG or WebP to 50KB for visa applications, ID photos and web uploads — done in your browser, private and instant.
Compress JPEG to 100KB
Compress JPEG to exactly 100KB online free. Shrink JPG photo size to 100KB for job applications, government portals and email — browser-based, private, no watermark.
Compress Photo to 50KB
Compress photos to exactly 50KB online free. Resize and compress JPG, PNG photos to 50KB for passport, visa and government forms — private, in-browser, no upload.
Compress PNG to 100KB
Compress PNG images to exactly 100KB online free. Reduce PNG file size while keeping transparency for logos, screenshots and UI design. In-browser, no upload.
Compress PNG to 20KB
Compress PNG to 20KB online free. Ultra-small PNG compression for favicons, app icons and emoji. Keep transparency while minimizing file size.
Compress PNG to 50KB
Compress PNG to exactly 50KB online free. Shrink PNG file size for fast web loading while preserving transparency. Perfect for mobile optimization and AMP pages.
Compress PPT Online – Reduce PowerPoint File Size
Reduce PowerPoint file size online free. Compress PPT / PPTX fully in your browser — no upload, no quality loss. Perfect before sending by email or uploading to a portal.
CSS Easing Generator
Free online CSS easing generator. Drag control points to create cubic-bezier curves with built-in presets and live preview. 100% private — runs in your browser.
Annuity Calculator
Free annuity calculator. Calculate periodic payments from a lump sum or the principal needed for target income. Fixed, lifetime and joint annuities with COLA. 100% private.
IBAN Checker
Check and validate any IBAN number from 73+ countries free online. IBAN checker with bank name lookup, MOD-97 checksum and SEPA verification. Completely private — runs in your browser.
Image to AVIF Converter
Convert HEIC, PNG, JPG, WebP, BMP, TIFF and ICO to AVIF free online. Next-gen compression, up to 50% smaller than JPG. Lossy and lossless modes. 100% private.
Image to BMP Converter
Convert HEIC, PNG, JPG, WebP, AVIF, TIFF and ICO to BMP free online. Lossless uncompressed output for raw pixel work. 100% private — batch ZIP download.
Image to ICO Converter
Convert HEIC, PNG, JPG, WebP, AVIF, BMP and TIFF to ICO free online. Auto-generates multi-size icons (16-256px) for favicons and apps. 100% private.
Image to JPG Converter
Convert HEIC, PNG, WebP, AVIF, BMP, TIFF and ICO to JPG free online. Adjustable compression quality and batch ZIP download. 100% private — files stay in your browser.
Image to PDF Converter
Convert HEIC, PNG, JPG, WebP, BMP and TIFF images into a single PDF free online. Reorder, rotate and set page size (A4, Letter). 100% private — no upload.
Image to PNG Converter
Convert HEIC, JPG, WebP, AVIF, BMP, TIFF and ICO to PNG free online. Supports transparency, batch conversion and ZIP download. 100% private — no upload.
Image to TIFF Converter
Convert HEIC, PNG, JPG, WebP, AVIF, BMP and ICO to lossless TIFF free online. Ideal for scanning, OCR and print workflows. 100% private — no upload.
Image to WebP Converter
Convert HEIC, PNG, JPG, AVIF, BMP, TIFF and ICO to WebP free online. 25-35% smaller than JPG with lossy and lossless modes. 100% private — batch ZIP download.
Image Resizer
Resize images online free without uploading. Three modes (stretch, fit, cover), 10 social media presets, HEIC and TIFF input, WebP export. 100% private — ZIP download.
Minecraft Locator Bar Color Checker
Check the locator bar color of any player in Minecraft. Look up a UUID's default color or pick a custom one and get a ready /waypoint modify command. Java and Bedrock Geyser supported.
Matrix Generator
Free online random matrix generator. Generate integer or decimal matrices with custom rows, columns and ranges. Heatmap visualization and math notation. 100% private.
PDF Encrypt & Decrypt
Password-protect PDF files online free. AES-256 and RC4 encryption with 8 granular permissions for printing, copying and more. 100% private — files stay on your device.
PDF Merger
Merge multiple PDFs into one file free online. Drag and drop to reorder pages — unlimited files up to 50MB each. 100% private, files never leave your browser.
PDF Splitter
Split PDF into single pages or custom ranges free online. Preview with thumbnails and extract exactly what you need. 100% private — ZIP download, no upload.
PDF to BMP Converter
Convert PDF pages to lossless BMP images free online. Custom DPI (72-600) and page range selection. Ideal for professional editing and printing. 100% private.
PDF to JPG Converter
Convert PDF pages to JPG images free online. Custom DPI (72-600), quality control and page range selection. Perfect for sharing and printing. 100% private — no upload.
PDF to PNG Converter
Convert PDF pages to PNG images free online. Lossless output with transparency, custom DPI (72-600) and page range selection. 100% private — ZIP download.
PDF to TIFF Converter
Convert PDF pages to lossless TIFF images free online. Custom DPI (72-600) and page selection. Ideal for OCR preprocessing and print workflows. 100% private — ZIP download.
PDF to WebP Converter
Convert PDF pages to WebP images free online. Up to 25-35% smaller than JPG, with custom DPI (72-600) and page range. 100% private — ZIP download, no upload.
Random Number Generator
Free online random number generator. Generate integers, decimals, passwords, strings and colors instantly. 100% private — runs locally in your browser.
URL Slug Generator
Convert text to SEO-friendly URL slugs free online. Supports 13 languages (Chinese, Japanese, Korean, Arabic and more) with transliteration. 100% private — runs in your browser.
Diff Checker
Diff checker and text compare online free. Compare two texts with side-by-side or unified view. Word, line and character-level diff with copy and ignore options. 100% private — no upload.
UUID Generator
Generate UUIDs / GUIDs free online. Supports versions v4, v7 and batch generation up to 1000, with uppercase and hyphen options. 100% private — uses cryptographically secure randomness, never leaves your browser.
About zztools.org
zztools.org is a lightweight, privacy-first collection of essential online utilities. From image processing to text conversion, from encryption to data generation — we provide a curated set of tools to help you get everyday tasks done right in your browser.
We believe good tools should be simple, efficient, and respect your privacy. That's why every tool runs entirely in your browser — your data never touches a server.
This site is maintained by independent developers and continuously improved. We welcome feedback and suggestions — and we appreciate everyone who shares zztools.org with others. Let's make online tools better, together.