May 27, 2026

Why Your iPhone Photos Won't Upload to Mercari (HEIC)

You snap a few photos of an item on your iPhone, open Mercari to list it, and the photos refuse to upload — or you get an image upload error. It feels random, but it isn't: Mercari doesn't accept the .heic format that your iPhone uses to save photos.

The fix is quick. Convert your photos to JPG and Mercari will take them every time.

How to convert iPhone HEIC photos to JPG for Mercari

QuickWand's free HEIC to JPG converter runs entirely in your browser, so your photos are never uploaded anywhere.

Open the HEIC to JPG converter.
Drop your .heic photos in, or click to browse. Add all the photos for your listing at once.
Choose JPG and set quality to around 90% so the condition and details of your item are clear to buyers.
Download the JPGs individually or as a ZIP, then upload them to your Mercari listing.

Why Mercari rejects HEIC iPhone photos

Since iOS 11 (2017), every iPhone saves photos as HEIC by default because it shrinks file sizes by about half. The trouble is that many marketplaces never adopted HEIC, and Mercari is one that rejects it. JPEG and PNG, on the other hand, are universally supported — so converting your HEIC photos to JPG makes them upload without complaint.

This is a common stumbling block for resellers, because the photos look completely normal in your camera roll. The format only becomes a problem at the moment you try to upload them.

Two ways to avoid it next time

Convert before uploading.Run new photos through the HEIC to JPG converter above — safe and quick, and it leaves your camera roll untouched.
Change your iPhone setting. Open Settings → Camera → Formats and choose Most Compatible so new photos save as JPG. Photos you already took stay HEIC and still need converting.

Keep your listing photos fast and clean

Mercari buyers browse quickly, so fast-loading photos help your items stand out. If your converted JPGs are large, shrink them with the free image compressor at 80–85% quality. The image looks the same but uploads faster and loads instantly.

Convert HEIC to JPG, compress if needed, and your iPhone photos will upload to Mercari without the dreaded image error.

Frequently asked questions

Why won't my iPhone photos upload to Mercari?

Mercari does not accept the HEIC format, and newer iPhones save photos as HEIC by default. When you try to upload those .heic files, Mercari rejects them or the upload fails. Converting your photos to JPG before uploading fixes the problem.

What image formats does Mercari accept?

Mercari accepts standard formats like JPEG and PNG, which are universally supported. It does not reliably support HEIC, so converting iPhone HEIC photos to JPG is the safest way to ensure your listing photos go through.

How do I convert my iPhone photos to JPG for Mercari?

Use a free HEIC to JPG converter: drop in your .heic files, choose JPG, and download the JPGs. QuickWand's converter runs in your browser so nothing is uploaded, and then you list on Mercari as usual.

Can I make my iPhone save JPGs instead of HEIC?

Yes. Open Settings, tap Camera, then Formats, and select 'Most Compatible'. Future photos save as JPG. Existing HEIC photos still need to be converted with the tool.