Developer Tools — Guides & Articles

• How to Edit an HTML Page Online Without Software

  Published 2026-10-12

  Edit an HTML page online in a sandboxed browser-based editor. Walk through the workflow, the 50,000-char HTML limit, the 30,000-char CSS limit, and the…

  

• An HTML Cleaner Alternative Built on the Browser Parser

  Published 2026-10-12

  A local HTML cleaner alternative that normalizes fragments through DOMParser, optionally strips comments, and is honest about its non-sanitizer boundary.

  

• Hello World API Alternative for 12 Programming Languages

  Published 2026-10-12

  Compare twelve source-checked Hello World programs across JavaScript, Python, Java, C, C++, C#, Go, Rust, Ruby, PHP, Swift, and Kotlin without an API call.

  

• Remove Excel Link From PPT Chart: Audit the Workbook

  Published 2026-10-11

  Audit the hyperlinks stored in your Excel workbook before breaking the chart link in PowerPoint. See which cells hold http, https, and mailto targets locally.

  

• How to Make Flexbox in HTML: Build a Container Block

  Published 2026-10-11

  Make flexbox in HTML by configuring five Flexbox properties in a local generator, previewing a five-item layout, and copying a deterministic CSS block.

  

• File Signatures List Cheat Sheet: Match Twelve Magic Bytes

  Published 2026-10-11

  Twelve source-checked magic-byte prefixes paired with their formats and notes. Compare them in a hex viewer, then validate the full file structure.

  

• View Excel Online History Without Uploading

  Published 2026-10-11

  View Excel Online history in a browser preview without uploading. Read stored .xlsx cell values as plain text, with no formula execution and no server copy.

  

• How to Convert Excel to JSON in Python and Locally

  Published 2026-10-11

  Converting Excel to JSON in Python usually means pandas or openpyxl. See the tradeoffs and a local browser export that doesn't upload your workbook.

  

• Convert an XLSX Worksheet to an HTML Table Snippet

  Published 2026-10-11

  Turn one local .xlsx worksheet into an escaped HTML table snippet in your browser. Stored values only, no upload, no formula execution, no formatting preserved.

  

• Excel Formulas Cheat Sheet Example: 12 Verified Formulas

  Published 2026-10-10

  Search twelve verified Excel functions by name, syntax, or task and copy vendor-style argument signatures for daily spreadsheet work.