Guides

Practical notes on image compression, PDF tasks, attachment size limits, and more.

• Choosing image sizes for the web

  Pick pixels for how wide the image will show, then compress so pages stay fast.

  2026-08-07 · About 8 min

• Compressing images before WeChat

  Shrink photos before chat or Moments so they send cleanly without turning mushy.

  2026-08-07 · About 8 min

• Checklist for scans to PDF

  From capture to PDF: check orientation, readability, and file size.

  2026-08-07 · About 9 min

• Safety checks before sharing files

  Before you share, check visible content, metadata, extra pages, and watermarks.

  2026-08-07 · About 9 min

• A simple way to pack and unpack ZIP files

  Before you send a homework or asset pack, tidy filenames, pick a compression level, then check the extract list.

  2026-08-07 · About 5 min