HUB · 🌏 Global
Developer & Digital Tools
Small developer / media utilities usable anywhere — OCR, image splitting, PDF merging, JSON cleanup. The kind of "I keep googling for this" tasks, ad-light and login-free.
Key stat
Saves 5–10 hours / year
OCR · image · PDF · JSON — no ad-ridden detour, no login.
Coverage
17 live · 0 planned · 17 total
All free, no login, all calculations stay in your browser.
Hub insight
Developer & Digital Tools — why this hub exists
OCR, image splitting, PDF merging, JSON cleanup — "the tasks I keep googling" — handled with minimal ads and no login. If you do these 5–10 times a month, saving 3–5 minutes each adds up to 5–10 hours a year. Everything runs in the browser, so confidential work files never leave your machine.
Recommended Top 3
Start here in this hub
Curated by priority, real-world usage, and search demand.
🌏 Global
YouTube Chapter Timestamp Formatter
Convert free-form timestamps into YouTube chapter format and validate the 5 YouTube rules in real time.
- YouTube
- Chapters
- Timestamps
🌏 Global
SERP Snippet Preview
Preview how titles and descriptions render on Google, Naver, and mobile SERPs with character and pixel limit warnings.
- SEO
- SERP
- Meta tags
🌏 Global
HEIC Batch Converter
Convert iPhone HEIC to JPG/PNG/WebP fully in-browser. Naver/Tistory/KakaoTalk presets for Korean platforms.
- In-browser
- Batch convert
- No upload
Tools in this hub
Showing 17 of 17
🌏 Global
YouTube Chapter Timestamp Formatter
Convert free-form timestamps into YouTube chapter format and validate the 5 YouTube rules in real time.
- YouTube
- Chapters
- Timestamps
🌏 Global
SERP Snippet Preview
Preview how titles and descriptions render on Google, Naver, and mobile SERPs with character and pixel limit warnings.
- SEO
- SERP
- Meta tags
🌏 Global
HEIC Batch Converter
Convert iPhone HEIC to JPG/PNG/WebP fully in-browser. Naver/Tistory/KakaoTalk presets for Korean platforms.
- In-browser
- Batch convert
- No upload
🌏 Global
Excel Diff · Two-Sheet Compare
Compare two XLSX/CSV files cell-by-cell in the browser. Color-coded add/remove/modify with export.
- In-browser
- XLSX diff
- Export changes
🌏 Global
AI Token Counter
Compare token counts and 2026 pricing across GPT, Claude, Gemini, and Llama on one page. Includes Korean efficiency chart.
- tiktoken
- Price compare
- Korean ratio
🌏 Global
EXIF Remover
Strip GPS, camera, and timestamp EXIF metadata fully in-browser. Map preview and ZIP download.
- Strip GPS
- In-browser
- Secondhand safe
🌏 Global
Korea Travel MBTI Quiz
Find your Korean Traveler Persona with 12 wacky situations from a Korea trip — in 14 languages.
- 12 questions
- 16 personas
- 14 languages
🌏 Global
Korean Saju Reading
Korean fortune telling with four-pillars saju: fortune, K-pop celebrity compatibility, and wealth — in 14 languages.
- Saju
- K-pop compatibility
- 14 languages
🌏 Global
YouTube Title Optimizer
Real-time YouTube title analyzer: length, emojis, keywords, CTR score + desktop/mobile preview.
- 60-char limit
- Emoji
- CTR
🌏 Global
KakaoTalk & Naver OG Preview
Preview Open Graph tags across KakaoTalk, Naver, Facebook, X/Twitter in one view.
- Kakao Large
- Naver List
- OG Validate
🇰🇷 Korea
Korean Encoding Repair Tool
Auto-detect and recover broken Korean text across EUC-KR, CP949, UTF-8 encodings.
- Auto-detect
- 5 candidates
- ZIP/Log
🌏 Global
Print Size Preset Generator
40+ print size presets A/B series, business card, poster with mm·inch·px conversion.
- A/B series
- 300dpi
- CMYK
🇰🇷 Korea
Korean HWP to PDF Converter Guide
Korean HWP to PDF conversion with 3 methods, format preservation and CLI scripts.
- 3 methods
- Format
- LibreOffice
🌏 Global
Image Table to Excel OCR
Image table to Excel/CSV via client-side Korean tesseract.js OCR.
- Korean OCR
- CSV export
- Client-side
🇰🇷 Korea
Korean YouTube Best Upload Time
Korean YouTube audience peak-time heatmap by category with competitor analysis.
- 9 categories
- Heatmap
- Competition
🇰🇷 Korea
Korean Cron Expression Translator
Cron expression to Korean natural language with next-10 runs and 20 presets.
- Natural
- Next 10
- 20 presets
🌏 Global
Short-form Hook Timing Guide
Short-form hook patterns for Shorts, Reels, TikTok with 30 proven templates.
- 30 patterns
- 3-sec hook
- Score
Related guides / blog posts
Long-form Korean-law / practice / operations context behind the tools in this hub.
🖼️ Blog
5 Ways to Convert HEIC to JPG — Compared (2026)
Five ways to convert iPhone HEIC to JPG — browser, iPhone setting, macOS Preview, Windows app, and CLI — compared on quality, EXIF, and speed.
🤖 Guide
What Is llms.txt and Why You Need It — AEO Primer (2026)
In the AI-search (AEO) era, llms.txt helps LLMs cite your site correctly. This primer covers how to write it and how it differs from robots.txt / sitemap.xml.
🏗️ Blog
Building 100+ Micro-SaaS Tools — Operational Lessons (2026 Retrospective)
A solo operator running 119 micro-SaaS tools shares lessons on infra, SEO, AEO, and operations — including the most expensive mistakes and the highest-leverage moves.
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