HEIC変換時にEXIFデータを保持する方法

When you convert HEIC photos to JPEG, most online converters strip EXIF metadata — but you can preserve GPS coordinates, timestamps, and camera information.

What is EXIF data?

EXIF (Exchangeable Image File Format) is metadata embedded in photo files. It includes:

• Date and time — when the photo was taken
• GPS coordinates — where the photo was taken
• Camera settings — aperture, shutter speed, ISO, focal length
• Device info — camera model, lens, software version
• Orientation — whether the photo needs rotation

Why most converters strip EXIF

There are three reasons most HEIC-to-JPEG converters lose EXIF data:

1. WebAssembly limitations — WASM-based converters decode to raw pixels, discarding metadata
2. Canvas API — the browser Canvas API strips all metadata when rendering
3. Lazy implementations — many tools simply re-encode pixel data without handling metadata

The heicgo approach: Extract then re-inject

heicgo.com uses a two-step process:

1. Extract — EXIF data is parsed from the HEIC file before decoding, using exifr
2. Re-inject — after conversion to JPEG, EXIF is written back using piexifjs

This is what makes heicgo the only WASM-based converter that preserves GPS and camera metadata.

Exif data preserved by heicgo

EXIF Tag	Description	Preserved
Make/Model	Camera manufacturer and model	Yes
DateTimeOriginal	Photo capture date/time	Yes
GPSLatitude/Longitude	Location coordinates	Yes
ImageWidth/Height	Original dimensions	Yes
Orientation	Rotation flag	Yes
Software	Processing software	Yes

Test it yourself

Take a HEIC photo with your iPhone, convert it at heicgo.com, then check the downloaded JPEG with any EXIF viewer. You’ll see all metadata intact.

Further Reading

• How to Convert HEIC to JPG — use the only converter that preserves EXIF
• Convert HEIC Without Uploading — keep your photos private
• HEIC vs JPEG Quality Comparison — why EXIF matters for photo management