NicheWorks

About this site

NicheWorks is a collection of small, quietly useful web tools— designed not for buzz or aesthetics, but for genuine everyday practicality. The goal is to solve niche but real problems with lightweight, browser-only tools.

Tools are intentionally simple, fast, and privacy-friendly. Most of them run entirely within your browser without sending data to any server.

→ More details can be found on the About page.

Tool Collection

Text & Document Tools

Lightweight utilities for text processing, document cleaning, and log formatting.

• ManualFinder (Official Manuals Directory)
  A curated index of official manuals for home appliances, cameras, gadgets, and more.
• TrashNavi (Waste Sorting Directory)
  Links to local government waste-sorting guides and pickup calendars.
• LogFormatter
  Beautify Nginx / HTTP access logs locally in your browser.
• Rename Wizard
  Clean and batch-rename filenames with preview.
• Contract Cleaner
  Highlight risky terms in contract text.
• EXIF Cleaner Mini
  Remove EXIF metadata from images (local processing).
• LineBreak Doctor
  Fix broken line breaks for SNS posts.
• URL Title Collector
  Fetch titles from multiple URLs at once.
• Message Generator
  Generate short message templates.

Image & File Tools

Utilities for image conversion, analysis, and file inspection.

• Image Compression Inspector
  Compare compression ratios across formats.
• Color Replace
  Replace a specific color in an image.
• WebP / AVIF Converter
  Convert images to highly compressed formats.
• FileType Sniffer
  Detect the actual file format by reading Magic Numbers.

Conversion & Analysis Tools

Utilities for converting, visualizing, and inspecting various data.

• JSON → Mermaid Converter
  Convert JSON structures into Mermaid diagrams automatically.
• UnitMaster (Unit Converter)
  Fast conversion across many measurement units.
• Kanji Modernizer
  Convert old Kanji forms into modern ones.
• Old Kanji Reference
  Dictionary of historical Kanji forms.
• Redirect Unwrapper
  Reveal the final destination of shortened URLs.

Daily Utility Tools

Practical tools useful in everyday life.

• JP Postal Lite
  Convert postal codes ↔ addresses in Japan.
• Unsubscribe Navi
  Official cancellation links for subscription services.

Other Utilities

Supplementary lightweight tools.

• WeatherDiff
  Compare forecasts across multiple APIs. Supports geolocation.
• WiFi Meter
  Visualize nearby Wi-Fi congestion.
• Cover Letter Lite
  Generate English cover letters.
• Cosmetic Ingredient Checker Lite
  Quick lookup for cosmetic ingredients.

Policy

Most tools are designed to run entirely within the browser. No user data is uploaded or stored on any server.

Some pages may display advertisements to support ongoing development and maintenance. All revenue is reinvested into improving the tools.