• How to Merge PDF Files Online

  Order files carefully, keep originals, and prefer browser-local merge for sensitive docs.

• Unix Timestamps Explained

  Unix time counts seconds (or milliseconds) since 1970-01-01 UTC. Logs and APIs use it constantly.

• What Is Base64 Encoding?

  Base64 encodes bytes into ASCII for transport. It is encoding — not encryption.

• What Is JSON and How to Format It?

  JSON is structured text for data interchange. Invalid commas, quotes or brackets cause parse errors.

• How to Calculate Reading Time

  Estimated reading time ≈ word count ÷ words-per-minute. Many publishers use ~200–250 WPM.

• Remove Duplicate Lines

  Deduplicate line-based lists while optionally preserving first-seen order — useful for exports and keyword sheets.

• URL Encoding Explained

  Percent-encoding makes reserved characters safe in query strings and paths.

• How to Compress PDF Files

  Shrink PDF payloads for email and portals. Results vary by embedded images — there is no fixed reduction ratio.

• Text Case Conventions

  Case conversion standardises strings for titles, code and campaign naming. Analytics parameters should stay lowercase.

• How to Split PDF Files

  Extract page ranges or split a PDF into parts without uploading for basic jobs.