Transparent PNG, JPG or PSD: Exporting a Cutout on iPhone

The confusing part

Why does the transparency vanish before I even share the file?

Because on a phone, "transparent" is usually a preview effect rather than something the file itself carries. The checkerboard you see while editing is the editor drawing behind your subject — the moment the image is written to a format or a pipeline with no room for an alpha channel, that information simply isn't there.

Camera formats aren't design formats

The still images a phone camera produces are built to hold photographs — colour, not a separate transparency channel. A cutout result has to be deliberately written into a format that supports one.

The checkerboard is UI, not data

Editors paint a pattern behind cut areas so you can judge edges. Nothing in that pattern travels with your subject, so a file that looked transparent can land somewhere completely solid.

Sharing re-encodes along the way

Chat apps, social uploaders and quick-save paths routinely convert an image again for size and compatibility. A second conversion is exactly where an alpha channel gets flattened into a background.

That's the whole source of the "the app must have failed" complaint: the mask was fine, the container wasn't. Which is why the format decision belongs at export time, not somewhere downstream.

PNG

Which format actually keeps an alpha channel?

PNG is the one built for this. Every pixel carries colour plus its own alpha value, so a cutout exports with real transparency — what the app describes as an alpha channel out of the box, with no separate "make it transparent" step after the cut.

Reach for PNG when

The subject has to sit on top of something else later
You need crisp, lossless edges on graphics and text
The file goes into a website, a slide, or a design tool
Soft edges matter: per-pixel alpha is what keeps a hair edge from turning into a hard silhouette

The cost of PNG

Bigger files than JPG at the same pixel dimensions
Some upload forms quietly re-save it and drop the alpha
Overkill for a photo that was never going to be composited
Verify: drop the file onto a dark page or open it in any editor — if the background shows through, the channel is really there

JPG

Can I export a transparent JPG from my iPhone?

No, and this isn't a limitation of any particular app — it's how the format is defined. JPEG has no alpha channel to write to, so a cut-out exported as JPG is composited onto a solid background at the moment of export and that background becomes part of the picture permanently.

What "transparent JPG" really gives you

A filled backdrop — commonly white — where the transparency used to be
No way to undo it later without cutting the subject out again
Lossy compression, so very hard edges can pick up faint artefacts
A genuinely small file that every camera roll, form and marketplace accepts

When JPG is still the right call

A product photo that is supposed to sit on a flat white backdrop anyway
A destination that requires a single opaque image
Sending a photo to someone who just needs to see it, small and fast
Choose the backdrop colour deliberately at export instead of letting a converter pick it for you

Layered PSD

What if the designer needs the layers back?

PNG and JPG both hand over one flattened rectangle of pixels — the answer to your editing session, but nothing to keep editing. A layered PSD — a Pro feature — hands over the stack instead: the transparency is stored as the subject sitting on its own layer rather than baked into the canvas.

Layers, not a picture of layers

The app keeps text and cut-out objects in one unified layer model that you reorder, select and delete like a design tool — and the layered export carries that stack rather than merging it down.

Move it, recolour it, hide it

Whoever opens the file can nudge the subject, swap the backdrop, or switch a caption off — the things you'd otherwise have to redo from the original photo.

Same document, two endings

A finished flat deliverable and an editable working file can come from one composition, so a review round doesn't restart the whole cutout.

Rule of thumb: if someone else is going to touch the image after you, export the stack. If nobody will, export the picture.

Export resolution

How much does an 8192px ceiling actually buy me?

On Pro, exports run at your photo's original resolution, up to a maximum of 8192px; the free tier exports at a reduced resolution. The preview you approved is replayed at the size you chose, which is the part that decides whether print, cropping and zoom views are workable at all.

Cutano Export Preview and Settings screen with PNG, JPEG and PSD format options and output size controls — The export settings screen: format tabs and output-size controls in one place.

Working resolution	Print size from an 8192px long edge (Pro)	Where that lands
300 DPI	About 27 inches / 69 cm on the long side	High-density print — the size most print workflows ask for before they start complaining
150 DPI	About 54 inches / 139 cm	Large-format and viewing-from-a-distance output, where dots aren't judged up close
72 DPI	About 113 inches / 289 cm	Screen-only maths; useful for scale, meaningless as a sharpness target

What the headroom is for

Cropping in tight afterwards and still having pixels left on the subject
A zoomable product image, where the detail the shopper inspects is a small region of the canvas
Print output that doesn't need the subject re-photographed because the source was 1080px
One cut-out reused across banner, square story and thumbnail without going soft

What it doesn't do

It isn't an upscale promise: a smaller source exports at its own size, not at 8192px
Resolution can't rescue a soft or badly masked edge — that's an edge job, not a size job
Bigger files follow bigger dimensions; match the pixel size to where it's going
Check what your destination asks for before assuming the ceiling is what you need

Choosing

Which format for which destination?

Same cutout, six very different endings. The deciding question is never "which is best" — it's whether transparency has to survive the trip.

Destination	Export	Why
Website graphics	PNG at original resolution (Pro)	Alpha has to reach the browser, and lossless edges keep text and hard product outlines clean at any zoom
Overlay onto another photo	PNG	Transparent subject with soft per-pixel edges at the boundary — JPG would arrive with a backdrop already glued to it
Print	PNG at original resolution (Pro), or PSD (Pro) if a studio handles prep	Print wants pixels, not resampling: the full-resolution ceiling is what keeps the subject sharp at size
Sending to a designer	Layered PSD	They continue your stack instead of re-cutting a flattened image to get one layer back
Platform listing image	JPG on a deliberate backdrop, or PNG if transparency is accepted	A solid, evenly filled background is what listing tiles expect — and it removes any guess about how the file gets re-encoded
Quick share to a phone	JPG	Smallest, universally accepted, and nobody downstream needs to composite it

The artefact

Why is there a faint coloured fringe around my subject?

It's the leftover background, hiding in the transition. At the border between subject and backdrop, pixels are genuinely part of both, so the mask gives them partial transparency — and the colour they keep is a little of the old background. On the checkerboard you can't see it. Put that same PNG on a dark page, or scale it up, and a halo appears.

Contraction pulls the edge in

Contracting the alpha edge discards that outermost band of mixed pixels, which is what removes the fringe on firm outlines. A little goes a long way — push it too far on hair and you start eating strands.

Feathering softens what's left

Feathering ramps the transparency instead of ending it abruptly, so the boundary stops reading as a cut-out ring. Contraction and feathering are live controls, so you can judge both against the background you're actually shipping to.

Brushes and a second model

Where the transition is wrong rather than just soft, the erase and restore brushes clean it non-destructively with undo — and re-matting with another model is often faster than repairing a fringe after the fact.

Fix the edge before you choose the format, not after: a halo baked into a JPG is permanent, and the same fringe inside a PSD is something your designer will find eventually.

FAQ

Export questions people actually type

Does a PNG really keep the background transparent?

Yes, when the file is written with an alpha channel — PNG is designed to store one per pixel, which is why it's the default answer for cut-outs. If yours looks solid, the transparency was lost somewhere after the cut: a converter, a chat app, or a form that re-saved it. Test by placing the image over a dark background; if the colour shows through your subject's outline, the channel is intact.

Can I open the layered PSD I exported in Photoshop?

PSD is Photoshop's own document format, and the whole reason to pick it over PNG is that you get a stack instead of one merged image — the subject and the text each stay on their own layer, in the order you set. Layer names and how particular layer types land in a desktop app can vary, so open one file early in a project rather than after the tenth revision.

What's the biggest file I can export?

On Pro, your photo's own resolution, capped at 8192px; the free tier exports at a reduced resolution. That's a ceiling rather than a target: a 3000px-wide shot exports at 3000px, not stretched. The cap is what matters for the cases where the source is large — print at size, tight crops after the fact, and images a shopper can zoom into.

Why does my JPG have a white box around the subject?

Because JPEG simply has no place to store transparency. Whatever was behind the cut-out has to be filled in at export, and many pipelines default that fill to white. It isn't damage — it's the format doing the only thing it can. Choose a transparent format when the backdrop needs to stay absent, or pick your fill colour on purpose when it needs to be there.

Do I lose quality if I export without a subscription?

Yes, in resolution: the free tier exports at a reduced size, while Pro unlocks original-resolution export up to 8192px and layered PSD. Plain cutout exports carry no watermark on any tier — the difference is resolution and formats, not a mark on the image. (Some AI-generated or composed features, like product showcase images, do add a watermark until you're on Pro.) PNG and JPG are available on every tier. Everything else about your plan is shown in the app, so check there before assuming what a given tier does or doesn't include.

You cut the subject out in seconds. The export decides whether it counts.