I built 54 free browser tools as a solo dev — everything runs client-side

Hey dev community 👋
I've been building Allplix (https://www.allplix.com) for the past few months. It's a collection of 55 free online tools that all run 100% in the browser — no server uploads, no signup, no limits.
What's inside
Image & Media tools:

AI Background Remover (uses MediaPipe ML in the browser)
Image compressor, resizer, enhancer
AI Video Editor with Auto-Reframe (YouTube → TikTok)

Developer tools:

JSON Formatter & Validator
Regex Tester with real-time highlighting
UUID Generator
CSS Gradient Generator
Color Converter (HEX/RGB/HSL/CMYK)

File converters (18 formats):

JPG ↔ PNG ↔ WebP ↔ PDF
DOCX → PDF/TXT/HTML
CSV ↔ JSON ↔ XLSX
HEIC → JPG/PNG

AI-powered tools:

AI Writing Assistant (rewrite, summarize, translate)
AI Spell Checker
AI Marketing Studio
AI Resume Builder with ATS scoring
Voice-to-Text (12 languages)

Productivity:

Pomodoro Timer, Todo List, Notes
Markdown Editor with live preview
Calculators (percentage, VAT, salary, loan)

The tech

Next.js 16 with App Router + Turbopack
React 19 with Server Components
Tailwind CSS 4
12 languages (FR, EN, ES, DE, PT, IT, AR, ZH, JA, HI, PL, RU)
936 pages in the sitemap
Client-side processing using Canvas API, WebAssembly, Web Audio API, MediaPipe ML

Why client-side?
Privacy. Your files never leave your device. No server costs either — everything runs on Vercel's free tier. The AI text tools (writing assistant, spell checker) use API calls to Groq's free tier, but media files (images, videos, audio) are processed 100% locally.
Lighthouse scores

Performance: 94-99
Accessibility: 96-100
Best Practices: 100
SEO: 100

What I learned

SEO is harder than coding. I had 4 critical SEO bugs that kept 632 pages from being indexed. JSON-LD hidden in client components, middleware redirecting everything to /en/, missing canonical tags... Took weeks to find and fix.
i18n is a massive multiplier. 55 tools × 12 languages = 936 pages. Each page is a door for Google traffic.
Marketing is the real challenge. Building the tools was the easy part. Getting people to know they exist is 10x harder.

The site is called Allplix — check it out at https://www.allplix.com
I'd love to hear your feedback. What tools would you want to see added?