Your Mac opens HEIC.
Nothing else does.
Your iPhone shoots HEIC, your Mac displays it fine — and then the upload form rejects it, Windows can't preview it, and the print shop asks for JPG. Three ways to fix that, one of which needs no apps at all.
Short answer: on a Mac you have three routes — Preview (open the file → File → Export → JPEG), Photos (select → File → Export → Export Photos → JPEG), or the HEIC to JPG tool in your browser (local, no app). One number to expect: HEIC compresses better than JPG, so the converted file is usually bigger — our test went from 29 KB to 46 KB.
By the Tool Pantry team, October 2026. Tested with Chrome 155 on macOS on a 640×640 HEIC test photo; the Preview and Photos routes work on any current macOS version.
Why HEIC breaks things on the Mac that made it
macOS itself speaks HEIC fluently — it's Apple's format. The breakage happens at the edges: an online form that only accepts JPG/PNG, a Windows colleague who gets a grey thumbnail, an older app that never implemented the codec, a printer that wants a boring universal format. Converting to JPG solves all of those in one move, because JPG opens literally everywhere.
Route 1: Preview (fastest for one file)
- Double-click the HEIC file — it opens in Preview.
- File → Export… (not "Save As").
- Set Format: JPEG, adjust the quality slider if you care about size, and click Save.
Preview is the no-nonsense route for one or two files. It keeps the original resolution and lets you dial quality from 0–100%.
Route 2: Photos (best for batches)
- Import the HEIC files (or select them if they're already in your library).
- File → Export → Export Photos…
- Choose JPEG as the kind, and set quality. Export writes copies — your originals stay HEIC.
This is the route when you're converting ten shots from a trip. It costs a library import first, which is the trade-off.
Route 3: The browser tool (nothing installed, nothing uploaded)
Open toolpantry.app/heic-to-jpg, drop the .heic file in, pick the quality (85% is the sensible default), and download. The HEIC decoder loads once into the browser and runs on your machine — the photo is never uploaded, which matters when the file is a passport scan or a signed document. It works identically on Intel and Apple silicon Macs, and on Windows and Linux too, so it's also the answer when you're not at your own computer.
What we measured
Our test photo — 640×640, 29.0 KB as HEIC — converted to 46.4 KB as JPG at standard quality. The increase is expected: HEIC's compression is simply more efficient, so JPG pays a size tax for its universality. If size matters more than compatibility, HEIC to WebP is the smaller modern option (our same test: 23.4 KB), and HEIC to PNG is the lossless choice for editing. Need to force the file under a form's limit afterward? The target-size compressor handles that in one pass.
The honest parts
Converting is a one-way street: JPG doesn't carry the depth maps and Live Photo data HEIC can. Keep your originals — the iPhone's HEIC files are the best-quality copies you own. And a small irony worth knowing: if you're sharing with another Apple device, you don't need to convert at all — AirDrop and Messages handle HEIC natively. The conversion is for the non-Apple world: forms, Windows, Android, printers. Windows users should see our companion guide, HEIC to JPG on Windows; the "why" behind the format is in Why are my iPhone photos HEIC?
Can Macs open HEIC files natively?
Yes — macOS has opened HEIC since High Sierra, and Preview, Photos, and Quick Look all display it. The trouble starts when you upload the file somewhere, send it to Windows or Android, or open it in an app that never learned HEIC.
How do I convert HEIC to JPG on a Mac?
Three ways: Preview (open the file, File → Export, choose JPEG), Photos (select photos, File → Export → Export Photos, JPEG), or a browser tool that converts locally — no app, works the same on Intel and Apple silicon.
Why is the JPG bigger than the HEIC?
HEIC compresses more efficiently than JPG, so converting almost always increases the file size. In our test, a 29 KB HEIC became a 46 KB JPG — normal, and worth knowing before you panic at the numbers.
Can I convert several HEIC files at once?
Yes — in Photos, select multiple photos and export them together. The browser tool converts one file per pass but needs no import into a library first, which is often faster for a handful of loose files.