Tools for the modern
knowledge worker.
Eternalsix is a digital product studio building focused web-based tools and SaaS micro-products for productivity, content creation, and AI workflows.
Built for focus, priced for individuals.
Each product solves one problem exceptionally well. No bloat, no upsells.
Hakwooner
Smart study management platform for academy students and instructors. Beta launch July 2026.
AI Handler
Unified workflow tool to orchestrate multiple AI assistants from a single interface. Save prompts, chain models, share workflows.
Tools Lab
A growing library of focused developer utilities — JSON, Base64, JWT, UUID and more. They run entirely in your browser, so nothing you paste is uploaded.
PitchPilot
Turn a one-line client brief into a polished, on-brand proposal — right inside your AI assistant. For freelancers & agencies.
29 free tools you can use right now.
Fast, focused developer utilities that run entirely in your browser — no signup, no limits, and nothing you paste is ever uploaded.
Base64 Encode / Decode
Encode text to Base64 or decode it back — instantly, in your browser.
Open tool →Basic Auth Header Generator
Turn a username and password into a Basic Authorization header.
Open tool →Binary to Text Converter
Convert text to binary and binary back to text.
Open tool →Case Converter
Convert text between camelCase, snake_case, kebab-case, and more.
Open tool →Color Converter
Convert colors between HEX, RGB, and HSL — with a live swatch.
Open tool →Cron Explainer
Decode a cron expression into plain English and see its next runs.
Open tool →Date Difference Calculator
Count the days, weeks, and months between two dates.
Open tool →Hash Generator
Compute SHA-256, SHA-1, SHA-384, and SHA-512 hashes in your browser.
Open tool →HTML Entity Encoder / Decoder
Escape and unescape HTML entities — safely, in your browser.
Open tool →JSON String Escape / Unescape
Escape or unescape a string for embedding in JSON.
Open tool →JSON Formatter
Format, validate, and minify JSON — instantly, in your browser.
Open tool →JSON to TypeScript
Turn a JSON sample into TypeScript interfaces — instantly.
Open tool →JSON ↔ YAML Converter
Convert between JSON and YAML — both directions, in your browser.
Open tool →JWT Decoder
Decode a JSON Web Token and read its claims — locally, never uploaded.
Open tool →Lorem Ipsum Generator
Generate placeholder text — paragraphs, sentences, or words.
Open tool →Meta Tag Generator
Generate SEO, Open Graph, and Twitter meta tags — instantly.
Open tool →Number Base Converter
Convert between binary, octal, decimal, and hex — live.
Open tool →Password Generator
Generate strong, random passwords — instantly, in your browser.
Open tool →Percentage Calculator
Work out percentages, ratios, and changes — instantly.
Open tool →Query String Parser
Break a URL query string into readable key/value pairs and JSON.
Open tool →Regex Tester
Test a regular expression against text and see every match.
Open tool →Slug Generator
Turn any title into a clean, URL-safe slug — live.
Open tool →Text Diff
Compare two blocks of text and see exactly what changed.
Open tool →Sort & Dedupe Lines
Sort, deduplicate, and trim lines of text — instantly.
Open tool →Unix Timestamp Converter
Convert Unix timestamps to dates and back — in your browser.
Open tool →URL Encode / Decode
Percent-encode text for URLs or decode it back — in your browser.
Open tool →UTM Link Builder
Build campaign-tracking URLs with UTM parameters — instantly.
Open tool →UUID Generator
Generate random UUID v4 identifiers — instantly, in your browser.
Open tool →Word & Character Counter
Count words, characters, sentences, and reading time — live.
Open tool →A studio, not a startup.
Eternalsix is an independent digital product studio based in South Korea. We build small, focused tools for individuals and teams — the kind of software that does one thing exceptionally well and gets out of your way.
Our philosophy: ship fewer things, but ship them better. Every product is built to be sustainable, profitable, and respectful of the customer's time.