If you are constantly fighting with iPhone photos that will not open on a Windows PC, will not upload to a website, or will not attach to an email, the root cause is your camera's default format: HEIC. The simplest long-term fix is to tell your iPhone to capture photos as JPG instead. This guide shows you exactly where that setting lives and how to flip it, and it covers what to do with the HEIC photos you have already taken. For those, our HEIC to JPG Converter handles the cleanup in seconds.
Changing this one setting means every new photo you take will open anywhere, on any device, with no conversion required. It takes less than a minute, and you can switch back just as easily if you change your mind.
Why Your iPhone Shoots HEIC by Default
Since iOS 11, Apple has set the camera to capture in HEIC because the format stores photos at roughly half the file size of JPG with no visible quality loss. That is genuinely useful for saving storage and speeding up iCloud backups. The downside is compatibility: HEIC is not accepted everywhere, which leads to the very upload and sharing problems that brought you here. If you want the full background, see our explainer on what a HEIC file is.
How to Switch Your iPhone Camera to JPG
Apple calls the JPG-capturing mode Most Compatible. Here is how to turn it on:
- Open the Settings app on your iPhone.
- Scroll down and tap Camera.
- Tap Formats at the top of the screen.
- Select Most Compatible instead of High Efficiency.
That is it. From this moment on, your iPhone captures every new photo as a JPG and every new video in the widely supported H.264 codec. There is no need to restart the phone or the camera. Take a test photo and check its details to confirm it now shows as JPEG.
It is worth noting where this setting lives and why Apple buries it. Because HEIC saves so much space, Apple keeps High Efficiency as the default and tucks the alternative inside the Camera menu rather than presenting it prominently. Most people never discover the option exists, which is exactly why they keep running into unsupported-format errors. Once you know the path is simply Settings, then Camera, then Formats, you can flip your iPhone to capture compatible files in well under a minute and forget about it. The change is permanent until you decide otherwise, so a single visit to this menu solves the problem for every photo you take from now on.
Most Compatible vs High Efficiency: What Changes
It helps to know exactly what you are trading when you switch:
- High Efficiency (HEIC): Smaller files, better quality-to-size ratio, supports advanced features like depth and wider color, but limited compatibility.
- Most Compatible (JPG): Slightly larger files, universal compatibility with every device and website, no codec headaches.
For most people who share photos widely or use a mix of Apple and non-Apple devices, the small increase in file size is well worth never seeing an unsupported-format error again. If you are weighing the two formats more broadly, our comparison of HEIC vs JPG breaks down quality, size, and compatibility in detail.
Does Switching to JPG Reduce Photo Quality?
In normal use, no one will ever notice a difference. Both Most Compatible and High Efficiency capture at the same resolution and use your iPhone's full camera processing. JPG uses an older compression method that is slightly less efficient, so files are larger, but the photos look identical on screen and in print. The only practical effect is that your library will use a bit more storage over time. For most people that trade is easily worth it, since the convenience of photos that open everywhere outweighs a modest increase in space, and you can always free up room by converting older HEIC shots or offloading them to a backup.
What to Do With Photos You Already Took in HEIC
Changing the setting only affects new photos. Everything already in your camera roll stays as HEIC, so you may still need to convert those when sharing. You have two easy options:
- Convert on iPhone: In Photos, select the images, tap share, choose Copy Photos, then paste them into a folder in the Files app, where they save as JPG.
- Convert online: Open the HEIC to JPG tool, upload your HEIC files, and download JPGs. This works on the iPhone itself or any computer.
If you have a large backlog, our guide on batch converting iPhone photos shows the fastest way to handle an entire camera roll at once.
Sharing HEIC Without Changing the Setting
If you would rather keep shooting HEIC for the storage savings, you can still avoid most problems. When you share via AirDrop, Messages, or Mail to certain recipients, iOS often converts to JPG automatically. There is also a transfer setting worth knowing about:
- Go to Settings > Photos.
- Scroll to Transfer to Mac or PC.
- Select Automatic so photos convert to a compatible format when you plug into a computer, rather than Keep Originals.
This keeps your library efficient while making transfers play nicely with Windows. If an upload still fails, our guide on why you cannot upload HEIC covers the fix.
Converting iPhone Photos to PNG or PDF
JPG is the right call for everyday photos, but sometimes you need a different format. For images with transparency or for screenshots you want to keep lossless, convert to PNG. If you are photographing a printed document, receipt, or form to send off, our HEIC to PDF tool combines your shots into a single clean PDF, which is far more practical than sending several separate images.
What Else the Formats Setting Controls on Your iPhone
The Formats screen affects more than just still photos, so it is worth understanding the full picture before you switch.
- Video codec: High Efficiency records video in HEVC (H.265), while Most Compatible records in the older H.264. H.264 video plays on virtually any device and editor, mirroring the photo trade-off.
- ProRAW and ProRes: On Pro models, a separate toggle lets you capture in these professional formats. These are independent of the Most Compatible choice and aimed at advanced editing.
- Storage impact: Because both photos and videos grow larger under Most Compatible, your library and iCloud usage will increase over time. If storage is tight, weigh that against the convenience.
For everyday users who mainly want photos and videos that open and share without friction, Most Compatible is the safer default. If you shoot a lot of 4K video or need maximum quality for editing, High Efficiency may still be worth keeping.
How to Confirm Your iPhone Is Now Shooting JPG
After changing the setting, it is easy to verify it took effect:
- Take a fresh test photo with the Camera app.
- Open it in Photos, then tap the info button or swipe up to see details.
- Look at the file type. A photo captured in Most Compatible shows as JPEG rather than HEIC.
If it still shows HEIC, double-check that you selected Most Compatible under Settings, Camera, Formats and that you are looking at a photo taken after the change rather than an older one.
Take Control of Your iPhone Photo Format Today
Switching your iPhone to the Most Compatible setting is the cleanest way to stop HEIC problems before they start, so every new photo opens anywhere without a second thought. For the photos already sitting in your camera roll, our free HEIC to JPG Converter turns them into universal JPGs in seconds. Change the setting once, convert your backlog, and never wrestle with an unsupported iPhone photo again. For a fuller walkthrough of conversion methods, see our guide on how to convert HEIC to JPG.