Guides

Fourteen write-ups on the things people most often get stuck on with QR codes and file conversion. Each one explains not just the steps but what the conversion costs you, since every format change loses something.

These are grouped by what you are starting from. If you are new to the tool, the about page explains how it works and what it deliberately cannot do.

QR codes

• How to make a Wi-Fi QR code
  Let guests join by scanning instead of typing a password — and where it is safe to display one.
• How to read a QR code from an image
  Decode a code from a screenshot, and check where it leads before you trust it.
• Static vs dynamic QR codes
  Why dynamic codes stop working when a subscription lapses, and how to get editability without the dependency.
• QR error correction levels explained
  What L, M, Q and H actually do, and which to pick for print, outdoors, or a code with a logo.

Images

• How to convert HEIC to JPG
  iPhone photos that Windows and Android refuse to open, fixed — and how to stop your phone making them.
• How to convert WebP to PNG
  That image you saved from a website which nothing will open. Also when to keep it as WebP.
• How to make a favicon (.ico)
  Build a multi-size icon from a PNG, plus the HTML that makes browsers pick it up.
• How to combine images into one PDF
  Turn a pile of phone photos of paperwork into one document somebody will accept.

PDFs and documents

• How to merge PDF files
  Combine, split, extract a page range or rotate — without handing a contract to a random website.
• How to convert a PDF to images
  PNG or JPEG, choosing a resolution, and why text extraction fails on scanned documents.
• How to convert DOCX to Markdown
  What survives the conversion from Word, what cannot, and the cleanup to expect.

Data and media

• How to convert CSV to Excel
  Why opening a CSV directly in Excel destroys leading zeros and turns product codes into dates.
• How to convert JSON to YAML
  Config files, both directions — including the Norway problem and why comments vanish.
• How to convert M4A to MP3
  Voice memos and iTunes audio for players that only want MP3, plus lifting audio out of a video.

The tool itself

All of these use the free QR generator and file converter, which runs entirely in your browser — no account, no uploads, no daily limit.

Something missing or wrong? Tell me — format requests and corrections both get acted on.