HEIC vs JPG: Which Image Format Should You Use?
By Bruce Shang
July 24, 2026· Updated on Sep 6, 2026· 6 min read
If you have taken photos on an iPhone in the past few years, you have seen the .heic extension. And if you have ever tried to open one on an older laptop, a work PC, or a website upload form, you have also seen the moment where nothing happens. That friction is the entire reason this guide exists.
HEIC is not a bad format. It is a storage format. JPG is a sharing format. Most of the confusion comes from using one where the other belongs.
What HEIC actually is
HEIC has been the default photo format on Apple devices since iOS 11. It is built on the HEVC (H.265) video codec, which is why it compresses so well: at the same visual quality, an HEIC file is usually about half the size of a JPG.
It also carries data JPG cannot, such as depth maps and Live Photo motion. Apple stores photos as HEIC because it saves space, not because it is trying to annoy anyone.
What JPG actually is
JPG (or JPEG) has been the universal image format since the early 1990s. Nearly every device, app, website, and printer can open it. It uses lossy compression, meaning it drops a little detail to save space, but at normal quality settings the difference is invisible on a screen.
HEIC vs JPG: side by side
| HEIC | JPG | |
|---|---|---|
| File size | Roughly 50% smaller at the same quality | Larger |
| Compatibility | Native on Apple; Windows and Android often need updates or extensions | Universal |
| Editing | Works well inside Apple's ecosystem, limited elsewhere | Supported by every tool |
| Live Photos / depth data | Yes | No |
| Best for | Storage inside Apple's ecosystem | Sharing, uploading, printing, web |
When HEIC is the right choice
Keep HEIC when the file stays inside Apple's world:
- Your library lives in Apple Photos or iCloud
- Storage space matters more than portability
- You rarely send the original file to other people
- You want Live Photos or depth data preserved
When you should convert to JPG
Convert before the file crosses into anyone else's hands:
- Uploading to websites, CMS, or forms that do not accept HEIC
- Sending photos to Windows or Android users, clients, or family
- Using a printing service
- Working in older design tools
- Attaching photos to email
- Keeping long-term backups, since a JPG from 1996 still opens today and the same cannot be said for a proprietary format
How to convert HEIC to JPG for free
The HEIC to JPG converter on SlimImg does the job in the browser:
- Open the converter
- Drag and drop one or more HEIC files (batch conversion is supported)
- Leave quality at 85–90 as a safe default, or lower it to shrink the file
- Download each file, or Download All for the whole batch
Everything runs locally, so private family photos never touch a server. That matters more for this format than for most, because HEIC files are usually exactly the photos you do not want floating around someone's upload folder.
Two settings that control all of this
Whether your iPhone stores HEIC or JPG is a setting, not fate:
- Settings → Camera → Formats → High Efficiency produces HEIC; Most Compatible produces JPG
- Settings → Photos → Transfer to Mac or PC → Automatic converts HEIC to JPG when you export to a Windows PC or older Mac
The second one only affects exported files. Your library still stores HEIC, so the same camera roll can appear as HEIC on the phone and JPG on the computer you transfer to. If that has ever confused you, nothing went wrong. The phone converted the files for you.
The storage math
The 50% claim matters most when you multiply it across a library. A 12 MP photo typically looks like this:
| Format | Typical file size (12 MP photo) | 10,000 photos |
|---|---|---|
| HEIC | 1.8–3 MB | ~24 GB |
| JPG | 3.5–6 MB | ~47 GB |
On a 256 GB phone, that is the difference between a comfortable library and a storage problem. The same math explains why HEIC is a bad format for sending files: what saves 20+ GB in storage adds friction every single time you share a photo.
A conversion workflow that does not degrade quality
When a whole album has to leave the Apple ecosystem, convert it once, in a batch:
- Keep the HEIC files in iCloud untouched. They are your masters, Live Photos included.
- Convert the export batch with the HEIC to JPG converter at quality 88.
- Spot-check the first and last files for size and artifacts rather than a random middle one.
- Name the output folder clearly (for example
2026-09_album) so the JPGs never get confused with the originals.
Converting once at the start beats converting file by file later, because every extra pass over an already converted JPG adds another generation of loss.
The one rule we keep coming back to
If a file will touch more than one device you do not control, send JPG. That covers email, upload forms, print shops, and basically every "send me the photos" request. If the file only ever lives on Apple hardware, HEIC's size advantage is worth keeping.
Common questions about HEIC and JPG
Is HEIC smaller than JPG?
Yes. At the same visual quality, HEIC is typically about 50% smaller. A photo that takes 4 MB as JPG is usually under 2 MB as HEIC, which is why Apple defaults to HEIC for storage. The tradeoff is compatibility, not size.
How do I convert HEIC to JPG for free?
Use the HEIC to JPG converter on SlimImg. Drag and drop the files, optionally adjust quality to 85–90, and download the JPGs. It runs entirely in the browser, with no sign-up and no uploads.
Does converting HEIC to JPG lose quality?
Converting decodes the HEIC to pixels and re-encodes them as JPG with lossy compression. At quality 85–90 the difference is invisible in practice and the file stays far smaller than the original camera output. If you want the absolute best quality later, keep the HEIC master too.
Can Windows open HEIC files?
Yes, after installing the free HEIF Image Extensions from the Microsoft Store. Without that extension, Windows treats the file as unreadable.
Do I lose Live Photos when converting?
Yes. Live Photo motion is dropped during conversion to JPG, so keep the original if the motion clip matters to you.
Is JPG or HEIC better for Instagram?
JPG. Instagram converts everything on upload anyway, and JPG is accepted by every tool in the workflow. If you need exact dimensions rather than format advice, the Instagram image size guide has the numbers.
Where to go from here
Keep HEIC for storage inside Apple's ecosystem. Convert to JPG for anything that will be shared, uploaded, printed, or attached to an email. The whole conversion takes seconds with the HEIC to JPG converter, and if you are still deciding between formats in general, the image formats guide compares JPG, PNG, WebP, HEIC, and SVG side by side.
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