Developer Tools— Guides & Articles

• File Signatures List Alternative: Twelve Verified Prefixes

  Published 2026-08-18

  A file signatures list alternative with twelve source-checked magic byte prefixes for common binary formats — searchable in your browser, no upload.

  

• How to Open Excel Files Online in a Browser Preview

  Published 2026-08-18

  Open an Excel workbook in a local browser preview without uploading or executing spreadsheet formulas. Steps, limits, and next-tool options.

  

• How to Convert Excel to JSON File for ITR Filing

  Published 2026-08-17

  Convert an Excel sheet to a JSON file for ITR filing in your browser. Keep tax data local, prepare headers, and download a clean JSON record set without…

  

• How to Convert HTML Table Data to Excel in Your Browser

  Published 2026-08-17

  Convert HTML table data to Excel with copy/paste, browser save-as, or Power Query. Step-by-step developer workflow plus a companion HTML snippet tool.

  

• How to Convert Excel Data to CSV in Your Browser

  Published 2026-08-17

  Convert Excel data to a clean CSV in your browser without uploading. Step-by-step workflow, escaping rules, explicit limits, and validation tips.

  

• Excel Merge Cells Keyboard Shortcut by Platform

  Published 2026-08-17

  Find the exact keyboard shortcut to merge cells in Excel on Windows, macOS, and Excel for the web. Platform-specific keys without confusing Ctrl-to-Command…

  

• How to Get Excel Hyperlinks Out of an .xlsx File

  Published 2026-08-17

  Extract http, https, and mailto hyperlinks stored in a local .xlsx file as a plain-text report with worksheet and cell location. No upload, no link following.

  

• Excel Formulas Cheat Sheet API Alternative for Devs

  Published 2026-08-17

  Use a browser-based Excel Formulas Cheat Sheet as an API alternative. Look up 12 verified function signatures locally and copy syntax without network calls.

  

• Get an Excel Column Letter and Export It as CSV Without Uploading

  Published 2026-08-17

  Need a single Excel column as a clean CSV file? Open your local .xlsx workbook, pick the column by its letter, and download a formula-safe CSV—no upload, no…

  

• How to Create an Empty File in Any Browser with Exact Size

  Published 2026-08-17

  Create an empty file in your browser with exact byte count from 1 to 50 MiB. Pick zero, random, or repeated text content for testing.