Instant Image Conversion: Change HEIC to JPEG on iPhone Without Any App

Why You Might Need This

iPhones capture photos in HEIC format by default (sometimes called HEIF). It’s an excellent format — better quality at smaller file sizes than JPEG. But the rest of the world hasn’t fully caught up. Many websites, job application portals, government forms, and older email systems still only accept JPEG or PNG. Windows PCs sometimes struggle with HEIC files too.

Instead of changing your camera settings permanently (which wastes storage by shooting in the larger JPEG format), the smarter approach is to shoot in HEIC and convert only when you need to share in a different format. That’s exactly what the Files app converter does.

How to Convert Images in the Files App

The Three Formats Explained

Batch Converting Multiple Images

The real time-saver: you can convert multiple images at once. In the Files app, tap Select in the top-right corner, choose all the images you want to convert, then tap the three-dot menu (⋯) at the bottom and select Quick Actions → Convert Image. All selected files are batch-converted to your chosen format and size. This is invaluable when you need to prepare a folder of photos for email or a web upload.

When to Use Each Size Option

The size picker gives you four choices. Here’s a practical guide for picking the right one:

• Small: Creates a significantly compressed version. Good for email attachments when file size limits are tight, or for messaging apps that compress images anyway.
• Medium: A balanced option. Maintains good visual quality while reducing file size noticeably. Perfect for most sharing scenarios.
• Large: High-quality conversion with minimal size reduction. Use when image quality matters but you need a format change (like HEIC to JPEG for compatibility).
• Original: Preserves the full resolution and dimensions. Only the format changes. Use this when you need pixel-perfect quality in a different container format.

Real-World Scenarios

Pro Tip: Set Your Camera to Shoot JPEG Directly

If you consistently need JPEG files and the conversion step feels annoying, you can change your camera’s default format. Go to Settings → Camera → Formats and switch from High Efficiency (HEIF) to Most Compatible (JPEG). Be aware that this roughly doubles the storage used by each photo. For most people, keeping High Efficiency and converting on demand is the smarter approach.

Alternative: Automatic JPEG When Sharing

Apple has a lesser-known setting that automatically converts HEIC to JPEG whenever you share via AirDrop, email, or Messages to non-Apple devices. Go to Settings → Photos and under “Transfer to Mac or PC,” select Automatic. This handles most compatibility issues without manual conversion. But for specific file size requirements or when you need a file in Files app, the Quick Actions converter remains the most precise tool.