These three formats get lumped together because they all hold pictures, but they're solving different problems. Pick the wrong one and you either waste space, hit an upload error, or send someone a messy pile of loose images. The trick is to stop asking "which is best" and start asking "what am I about to do with this." Once you frame it that way, the right format picks itself. Here's how to choose without overthinking it.
The 20-second version
| Format | Best for | Watch out for |
|---|---|---|
| HEIC | Storing photos on an iPhone with minimal size | Won't open on many non-Apple devices |
| JPG | Sharing, uploading, posting anywhere | One image per file; re-saving loses a little quality |
| Documents, forms, multi-page submissions, printing | Larger file; overkill for a single casual photo |
HEIC: the space-saver
HEIC is what your iPhone makes by default. It uses modern compression to squeeze a photo into roughly half the size of a JPG while keeping the same visible quality, and it can carry extras like Live Photo motion and depth data. If you're new to it, our explainer on what a HEIC file actually is covers the background.
Keep HEIC when the photo is staying on your Apple devices. Convert away from HEIC when it needs to go to a Windows PC, an Android phone, a web form or anyone who reports it "won't open."
JPG: the universal handshake
JPG (or JPEG) has been the default photo format since the 1990s. It's not the smallest or the highest quality, but it has one superpower: everything reads it. Every browser, email client, printer, social network and upload form accepts JPG without a second thought.
That's why converting HEIC to JPG is the single most common fix when a photo gets rejected. It's fast and the quality loss is invisible for normal use. Our HEIC to JPG converter does it in your browser; if you want crisp edges with zero added compression — screenshots, graphics, anything with text — reach for HEIC to PNG instead.
The catch with JPG: one file holds exactly one image. If you've got eight photos for an application, you'd be attaching eight separate files. That's where the third format earns its place.
Turning photos into a document?
Merge a batch of HEIC or other images into one clean, page-by-page PDF — free, no watermark, no account, and processed right in your browser so your files never leave your device.
Convert HEIC to PDF →PDF: the document wrapper
A PDF isn't really an image format — it's a page format that can hold images. That distinction is exactly why it's the right call for paperwork. A PDF locks each photo onto a fixed page, keeps your files in a set order, and bundles many images into one file the recipient can scroll, print or sign.
Reach for PDF when you're submitting receipts for an expense claim, sending ID documents, uploading proof to a visa or rental application, or anything a person or system expects as "a document" rather than "a photo." You can go straight from iPhone photos with HEIC to PDF, or if your pictures are already JPG or PNG, combine them with Images to PDF.
A quick decision guide
- Just storing it on your iPhone? Leave it as HEIC.
- Sending one photo to someone or posting it online? Convert to JPG.
- Need it sharp with hard edges or text? Convert to PNG.
- It's a form, receipt, ID, or several photos that belong together? Make a PDF.
Bottom line
There's no single "best" format — there's the right one for what you're about to do. HEIC saves room, JPG goes anywhere, PDF behaves like paper. Once you know which job you're doing, the choice is obvious, and every conversion above takes a few seconds in the browser with nothing to install, no account, and no watermark stamped across your work. Keep your originals as they are and convert a copy whenever a particular task demands a particular format — that way you're never locked into one and never stuck at an upload screen again.