# Flex Utils

> Flex Utils is a collection of free, privacy-first web utilities at flexutils.com. All tools run entirely in the browser with zero data uploaded to servers. The site features AI-powered tools using Transformers.js, image processing utilities, calculators, and productivity tools—all processing happens client-side for maximum privacy and speed.

## Key Features

- **Privacy-First**: All processing happens in-browser. No files or data are ever uploaded to servers.
- **AI-Powered**: Browser-based machine learning using Transformers.js with WebGPU acceleration.
- **Offline-Capable**: Progressive Web App that works offline after initial load.
- **Free Forever**: No accounts, no subscriptions, no limits.

## AI Tools

- [AI Idea Generator](https://flexutils.com/ai-tools/idea-generator): Generate creative ideas with AI-powered suggestions and implementation plans. Perfect for brainstorming, startups, and projects. Uses Transformers.js—runs 100% in browser.
- [AI Image Segmentation](https://flexutils.com/ai-tools/image-segmentation): Identify 150+ object categories in images using semantic segmentation. Detects people, furniture, vehicles, nature elements. Export tags as JSON or copy to clipboard.
- [AI Image Upscaler](https://flexutils.com/ai-tools/image-upscaler): Upscale images 4x using AI. Optimized for anime and illustrations. Enhances quality and resolution without server uploads.
- [AI Voiceover Generator](https://flexutils.com/ai-tools/voiceover-generator): Convert text to natural speech with 27 AI voices using Kokoro TTS. Generate voiceovers for YouTube, podcasts, and presentations.
- [AI Document Q&A](https://flexutils.com/ai-tools/document-qa): Upload PDF, Markdown, or TXT documents and ask questions answered by AI using retrieved context. Full RAG pipeline (embed, search, rerank, generate) runs 100% in browser with citations.

## Calculators

- [Percentage Change Calculator](https://flexutils.com/calculators/percentage-change): Calculate percentage increase or decrease between two values with step-by-step formula breakdown.
- [Compound Interest Calculator](https://flexutils.com/calculators/compound-interest): Calculate investment growth with compound interest and monthly SIP contributions. Interactive charts, yearly breakdown, PDF export. Supports 10+ currencies.
- [Home Loan EMI Calculator India](https://flexutils.com/calculators/home-loan-india): Calculate home loan EMI with Indian currency formatting (Lakhs/Crores). Features prepayment analysis, affordability assessment (FOIR), maintenance charges escalation, scenario comparison, and PDF export with amortization schedule.

## Image Tools

- [Image Compressor](https://flexutils.com/image-tools/compress-image): Batch compress JPG, PNG, and WebP images. Achieve 80%+ size reduction for Google Photos, Drive, iCloud, and Dropbox.
- [Indian Passport Photo Resizer](https://flexutils.com/image-tools/passport-photo-india): Create Indian passport and visa photos meeting official specs: 2x2 inch (51mm), 20-100KB, 350-1000px, 200-300 DPI.
- [Image Color Picker](https://flexutils.com/image-tools/image-color-picker): Extract HEX, RGB, HSL, and CMYK colors from images. Zoom and pan for precision. Export palettes to JSON, CSS, SCSS, or Tailwind.
- [Image to Base64 Converter](https://flexutils.com/image-tools/image-to-base64): Convert images to Base64 data URIs for HTML, CSS, and email templates. One-click copy.
- [WebP Converter](https://flexutils.com/image-tools/image-to-webp): Convert JPG and PNG to optimized WebP format. Bulk conversion supported.

## Date & Time Tools

- [Meeting Time Planner - World Clock & Time Zone Overlap](https://flexutils.com/date-time/world-clock-meeting-planner): International meeting time planner with visual time zone overlap. Find business hours overlap for US-India, US-UK & global teams. Free, with calendar export.

## Productivity Tools

- [Animated Travel Map](https://flexutils.com/productivity/animated-travel-map): Create animated travel maps for YouTube videos and presentations. Define multi-stop routes, select travel modes (Air, Car, Bus, Bike, Ship), customize icons, and export smooth map animations as WebM video.

## Technical Stack

- **Framework**: Next.js 16 with App Router and React 19
- **AI Runtime**: Hugging Face Transformers.js (@huggingface/transformers) for browser-based ML inference
- **TTS Engine**: Kokoro.js for text-to-speech synthesis
- **ONNX Runtime**: onnxruntime-web for optimized model inference
- **UI**: Tailwind CSS 3.4 + shadcn/ui (Radix UI primitives)
- **Charts**: Recharts for interactive data visualization
- **PDF**: jsPDF with AutoTable for document generation
- **SEO**: JSON-LD structured data (WebApplication, FAQPage, HowTo, BreadcrumbList)

## Optional

- [About Us](https://flexutils.com/about): Learn about the team, mission, and privacy-first philosophy behind Flex Utils.
- [Contact Us](https://flexutils.com/contact): Get in touch with the Flex Utils team for support, feedback, or feature requests.
- [Terms of Service](https://flexutils.com/terms): Terms governing the use of Flex Utils tools and services.
- [Privacy Policy](https://flexutils.com/privacy-policy): Data handling and privacy practices.

## Contact

- Website: [https://flexutils.com](https://flexutils.com)
- Email: [contact@flexutils.com](mailto:contact@flexutils.com)
- Contact Form: [https://forms.gle/mB7Jnj2Qtfp2BexB6](https://forms.gle/mB7Jnj2Qtfp2BexB6)

## Last updated

February 2026