Question 1

Why are my photos HEIC, and why will nothing open them?

Accepted Answer

**HEIC** is the file extension for images stored in **HEIF** — the High Efficiency Image File Format — using HEVC compression. It became the default on iPhones some years ago, which is why photos that used to be JPEGs suddenly were not.

**Why it was adopted.** HEIF stores an image at roughly **half the file size** of a comparable JPEG at similar visual quality. It also supports things JPEG cannot: **16-bit colour** rather than 8-bit, **transparency**, **image sequences** — which is how Live Photos are stored — depth maps, and non-destructive edits held alongside the original.

**Why support is patchy.** Two reasons, and the second is the real one:

**Age.** JPEG has been universally supported for three decades. HEIF is far newer, and older software simply predates it.

**Patent licensing.** HEVC, the underlying codec, is encumbered by patent pools with complex licensing. That has made operating systems and open-source software reluctant or unable to include decoders by default — which is why support arrived slowly and unevenly, and why some platforms require a separate paid or optional codec package.

**How to deal with it:**

**Change the camera setting.** On iPhone, Settings → Camera → Formats → **Most Compatible** captures JPEG instead. You lose the size advantage and gain universal compatibility.

**Change the transfer setting.** Settings → Photos → Transfer to Mac or PC → **Automatic** converts to JPEG on export while keeping HEIC on the device — usually the better compromise, since it keeps the storage saving.

**Install a decoder.** Windows offers HEIF and HEVC extensions through the Microsoft Store; macOS and iOS support it natively; recent Android versions do too.

**Convert in bulk** with an image tool, or by opening in Preview or Photos and exporting.

**Email and messaging apps frequently convert automatically**, which is why a photo that will not open when copied from the phone opens fine when emailed.

**Note that converting to JPEG discards** transparency, depth data and colour depth — irrelevant for most snapshots, not for edited work.

Question 2

Why do my photos lose quality when I send them?

Accepted Answer

Because most messaging and social platforms recompress images on upload, and several also resize them — so what arrives is a smaller, more heavily compressed copy rather than the file you sent. What

Question 3

Why does my computer say a file is in use when nothing is open?

Accepted Answer

Because "in use" means a process holds a handle to the file, and plenty of processes do that without any visible window. What is usually holding it: A background indexing or search service reading

Question 4

How do files get corrupted?

Accepted Answer

A file is corrupted when its stored bytes no longer represent valid data for its format. The causes are varied, and most are about interrupted writes rather than data spontaneously degrading.

Question 5

Why does my screen recording or screenshot come out black?

Accepted Answer

Almost always because of deliberate content protection — the system is preventing you from capturing something, and a black frame is what that prevention looks like. It is a feature, not a fault,

Question 6

Why do my files open in the wrong application?

Accepted Answer

Every file type has a default application registered with the operating system, and opening a file consults that registration rather than anything about the file itself. Installers frequently claim

Question 7

Why is my scanned PDF so large?

Accepted Answer

Because a scan is not a document — it is a collection of photographs, and it is stored as image data rather than as text. The difference. A PDF created from a word processor stores text characters

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