Subdomain Lookup (web-toolbox.dev)
Free tool for researching subdomains of a specified domain. Enumerates subdomains from DNS databases and public sources, useful for security research and understanding site structure.
Subtraction Challenge (minus.onl.jp)
A math practice web app where you solve subtraction problems within a time limit. Great for improving children's arithmetic skills or as a brain workout for adults, with score recording.
Sudoku (toolpods.io)
Browser-based sudoku puzzle. Fill a 9×9 grid so every row, column, and box contains digits 1–9. Multiple difficulty levels available.
Suggestion Extractor (web-toolbox.dev)
Free tool for bulk-fetching keyword suggestions from search engines like Google. Useful for SEO keyword research and content planning.
SVG Blob Generator (web-toolbox.dev)
Free tool for generating random organic-shaped SVG blobs. Great for design accents or website background decorations.
SVG to CSS (web-toolbox.dev)
Free tool for converting SVG data to Data URI format for use as a CSS background-image. Useful when you want to use SVG icons in CSS without external files.
Symbol (www.piliapp.com)
A comprehensive online symbol and special character reference. Browse and copy symbols by category including arrows, currency, math, and more for use in documents and social media.
Table to Markdown Converter (boost-tool.com)
A free online tool to convert CSV or Excel data into Markdown table notation. Quickly transforms tabular data into a format suitable for Markdown documents or GitHub READMEs.
Team & Group Divider (toolpods.io)
Randomly divide a list of members into groups. Specify the number of groups to create even or random groupings.
Tetris (toolpods.io)
Browser-based Tetris game. Rotate and place falling blocks to clear lines.
Text / File Diff (www.oh-benri-tools.com)
An online tool for comparing two texts or files and displaying the differences clearly. Supports drag-and-drop file input, split view, and syntax highlighting.
Text Case Converter (web-toolbox.dev)
Free tool for converting text to camelCase, snake_case, PascalCase, kebab-case, and more. Useful for naming convention conversion in programming and data processing.
