# PreppHint > PreppHint offers 100+ free online tools (image converters, compressors, PDF tools, calculators, and generators), free browser extensions for Chrome and Microsoft Edge, and AI prompts and tutorials, created by developer Aman Kumar. PreppHint (www.prepphint.com) publishes free, browser-based tools that run without cost or sign-up, plus step-by-step guides on AI video and image generation workflows, and browser extensions available on the Chrome Web Store and Microsoft Edge. Most PreppHint browser extensions run entirely on the user's device, so user data is processed locally and is not uploaded to PreppHint servers. ## Popular Free Tools - [PNG to JPG Converter](https://www.prepphint.com/2025/12/png-to-jpg.html): Convert PNG images to JPG online, free. - [JPG to PNG Converter](https://www.prepphint.com/2025/12/jpg-to-png.html): Convert JPG images to PNG online, free. - [WebP to PNG Converter](https://www.prepphint.com/2026/06/webp-to-png.html): Convert WebP images to PNG online, free. - [PNG to WebP Converter](https://www.prepphint.com/2026/06/png-to-webp.html): Convert PNG images to WebP online, free. - [HEIF to JPG Converter](https://www.prepphint.com/2026/04/heif-to-jpg.html): Convert HEIF images to JPG online, free. - [SVG to PNG Converter](https://www.prepphint.com/2026/06/svg-to-png.html): Convert SVG files to PNG online, free. - [JPG to PDF Converter](https://www.prepphint.com/2026/05/jpg-to-pdf.html): Convert JPG images to PDF online, free. - [PNG to PDF Converter](https://www.prepphint.com/2026/06/png-to-pdf.html): Convert PNG images to PDF online, free. - [GIF to WebP Converter](https://www.prepphint.com/2026/07/gif-to-webp.html): Convert GIF images to WebP online, free. - [Compress PDF](https://www.prepphint.com/2026/03/compress-pdf.html): Reduce PDF file size online, free. - [Merge PDF](https://www.prepphint.com/2026/06/merge-pdf.html): Combine multiple PDF files into one online, free. - [JPEG Compressor](https://www.prepphint.com/2026/06/jpeg-compressor.html): Compress JPEG images online while keeping quality. - [Image to Text Converter (OCR)](https://www.prepphint.com/2026/01/image-to-text-converter.html): Extract text from images online, free. - [QR Code Generator](https://www.prepphint.com/2026/03/qr-code-generator.html): Create custom QR codes online, free. - [Random Password Generator](https://www.prepphint.com/2026/03/random-password-generator.html): Generate secure random passwords online. - [UUID Generator](https://www.prepphint.com/2026/03/uuid-generator.html): Generate UUIDs online, free. - [Age Calculator](https://www.prepphint.com/2025/12/age-calculator.html): Calculate age from a date of birth online. - [Percentage Calculator](https://www.prepphint.com/2026/03/percentage-calculator.html): Calculate percentages online, free. - [GPA Calculator](https://www.prepphint.com/2026/03/gpa-calculator.html): Calculate GPA online, free. - [YouTube Thumbnail Downloader](https://www.prepphint.com/2026/01/youtube-thumbnail-downloader.html): Download YouTube video thumbnails online, free. - [YouTube Subscribe Link Generator](https://www.prepphint.com/2026/07/youtube-subscribe-link-generator.html): Create YouTube subscribe links for channels, free. - [Online Metronome](https://www.prepphint.com/2026/03/metronome-tool.html): Free online metronome for music practice. The full catalog covers 72 image converters across PNG, JPG, WebP, GIF, SVG, TIFF, ICO, HEIF, and BMP formats, plus 23 calculators and 9 generators. The complete list with URLs is in /llms-full.txt and in the sitemap at https://www.prepphint.com/sitemap.xml. ## AI Guides, Prompts, and Tutorials - [Make Viral AI Videos with Google Flow + Veo 3 (Free Prompt)](https://www.prepphint.com/2026/07/google-flow-viral-ai-video.html): A guide with a free prompt and workflow for creating viral-style AI videos using Google Flow and Veo 3. - [Turn Any Image into a Free 3D Model](https://www.prepphint.com/2026/07/trellis-2-image-to-3d.html): A guide to converting images into free 3D models using Microsoft's open-source TRELLIS 2. - [Animate Any Image for Your Music Video (Completely Free)](https://www.prepphint.com/2026/07/animate-any-image-using-ai.html): A guide describing a free method for animating still images, aimed at AI music channels that would otherwise use static images. - [How to Make Viral Miniature Cooking Videos With AI (No Prompt Needed)](https://www.prepphint.com/2026/07/ai-miniature-cooking-generator.html): A guide to creating miniature cinematic cooking videos with AI without writing prompts manually. - [Monochrome Particle-Render Prompt](https://www.prepphint.com/2026/07/monochrome-particle-render-prompt.html): A free prompt that turns any image into a futuristic black-and-white point-cloud style render. - [AI Tool Builder Prompt](https://www.prepphint.com/2026/07/ai-tool-builder-prompt.html): A guide and prompt for building AI tools. - [Omma AI App Builder](https://www.prepphint.com/2026/07/omma-ai-app-builder.html): A guide to the Omma AI app builder. - [NVIDIA Free API](https://www.prepphint.com/2026/07/nvidia-free-api.html): A guide to NVIDIA's free API access for AI models. - [200+ Workout Prompts for Faceless Fitness Videos](https://www.prepphint.com/p/200-premium-workout-prompts-to-create.html): 200+ ready-to-use AI fitness video prompts for coaches, trainers, and gym content creators. - [Google Flow Tools Directory](https://www.prepphint.com/p/google-flow-tool.html): Directory of custom-built AI tools created with Google Flow. ## Browser Extensions and Apps - [PreppHint Extensions](https://www.prepphint.com/p/prepphint-extension.html): Free browser extensions for Chrome and Microsoft Edge, including tools such as Volume Master, Adblock for YouTube, and Audio Capture. - [TaskCo: To Do List and Reminders](https://play.google.com/store/apps/details?id=com.melodicvista.taskco): Android productivity app for managing tasks, daily reminders, and habit tracking. ## Company - [About Us](https://www.prepphint.com/p/about-us.html): About PreppHint and its founder, Aman Kumar. - [Contact Us](https://www.prepphint.com/p/contact-us.html): Contact page for questions, tool ideas, and problem reports. - [Bug Report](https://www.prepphint.com/p/bug-report.html): Report a problem with a PreppHint tool or extension. - [Privacy Policy](https://www.prepphint.com/p/privacy-policy_2.html): How PreppHint handles user data. - [Terms and Conditions](https://www.prepphint.com/p/terms-and-conditions.html): Terms of use for the website and tools.