Three native ways to turn a PNG screenshot into a JPG on iOS, plus the fastest browser method that takes under ten seconds. None of them needs an App Store download. Files app handles single conversions through Quick Actions in iOS 16 or later. Safari handles bulk jobs and exact size targets like 100KB or 200KB through a browser-based PNG to JPG converter that runs locally on your phone. Shortcuts handles repeat conversions with one tap from the Share Sheet. A single screenshot drops from 4MB as PNG to about 400KB as JPG at default quality, which is why most people bother in the first place.

Why your iPhone keeps making PNG files

PNG arrives on your iPhone for two reasons. Every screenshot you take is saved as PNG by default, because iOS treats screenshots as lossless captures rather than photos. A full-screen grab on a recent iPhone runs 3MB to 8MB. The second source is Markup. When you annotate or edit an image inside Photos, the export often comes out as PNG even when the original was a JPG. Both situations end with files too large for email attachments, government upload limits, or storage you want to keep free.

Method 1: Convert PNG to JPG using the Files app

Files app does this natively in iOS 16 and later through a feature called Quick Actions. No download required.

1. Open Photos and find the PNG you want to convert. Screenshots live in the Screenshots album.

2. Tap Share, then Save to Files, and pick a folder.

3. Open the Files app and find the PNG you just saved.

4. Long-press the file. A menu opens.

5. Tap Quick Actions, then Convert Image.

6. Pick JPEG as the format and choose your image size (Small, Medium, Large, Actual Size).

7. The new JPG appears in the same folder as the original PNG.

This works for one file at a time. iOS labels the output JPEG rather than JPG, but the file extension is .jpg and behaves identically everywhere. The downside is no quality slider. You get Apple’s preset compression with no preview of the file size before you commit.

Method 2: Convert PNG to JPG in Safari (fastest for bulk)

Safari handles batch conversions and exact size targets that Files cannot. The free PNG to JPG converter runs entirely inside the browser, so the file never leaves your phone. It uses the HTML5 Canvas API to do the conversion locally. You can even switch on Airplane mode after the page loads and the conversion still runs.

Steps in Safari:

1. Open thepngtojpg.com in Safari.

2. Tap the upload area. iOS asks whether to take a photo, choose from your Photo Library, or pick from Files.

3. Select up to 50 PNG images at once. Each file can be up to 25MB.

4. Pick Quality mode (drag the slider, default sits at 90%) or Target Size mode (presets cover 50KB, 100KB, 200KB, 500KB, plus a custom value).

5. Tap Convert, then download each JPG individually or hit Download All.

Target Size mode is the differentiator. If a job portal demands a passport photo under 100KB, the tool runs a binary search across quality levels to find the highest quality that stays under your cap. Files app cannot do that. Most browser converters cannot either.

Method 3: Convert PNG to JPG with the Shortcuts app

Shortcuts is the right call if you convert images several times a week and want a one-tap option from the Share Sheet.

1. Open the Shortcuts app.

2. Tap the plus to create a new shortcut.

3. Add the Select Photos action.

4. Add the Convert Image action and set Format to JPEG.

5. Add the Save to Photo Album action.

6. Name it (something like “PNG to JPG”) and tap Done.

Once saved, run the shortcut from the Share Sheet of any image. Shortcuts saves the JPG straight into your Photos library, which is faster than Files for camera-roll workflows. The trade-off is the same as the Files method: no quality slider, no file size preview.

Which method should you use

Pick the method that matches your volume.

• One-off conversion of a single screenshot: Files app, Quick Actions. Quickest path on iOS 16 or later.

• Batch of screenshots, or a strict file size cap (100KB, 200KB): Safari and the browser converter. Bulk and target-size are the two things native iOS cannot do.

• You convert images several times a week: Shortcuts. The Share Sheet shortcut is the fastest repeat workflow once it is built.

If you have iOS 15 or older, the Files app route is unavailable. Use Safari or build a Shortcut.

Where the converted JPG saves

Files app saves the JPG into the same folder as the original PNG. Safari saves through the browser download flow: tap the download link, and the JPG lands in the Downloads folder inside Files. Long-press that file and choose Save to Photos if you want it in your camera roll. Shortcuts writes directly into Photos through the Save to Photo Album action. None of the three methods deletes the original PNG.

Frequently asked questions

Can I convert PNG to JPG on iPhone without an app?

Yes. iOS has three native paths that need no App Store download: Files app Quick Actions on iOS 16 or later, the Shortcuts app on any current iOS version, and a browser converter inside Safari. Files and Safari are the two no-setup options. Shortcuts needs a one-time build.

What is the difference between JPG and JPEG on iPhone?

JPG and JPEG are the same format. JPEG is the original three-letter extension from 1992, shortened to JPG when Windows operating systems still required three-character file extensions. iOS labels the format JPEG inside Quick Actions and the Files menu, but the saved file uses the .jpg extension. There is no quality difference between the two labels.

Which iPhone methods work in iOS 15?

Two methods work on iOS 15: the Shortcuts app and the Safari browser converter. Files app Quick Actions for image conversion landed in iOS 16, so it is unavailable on older versions. If you cannot update, build a Shortcut once and use it from the Share Sheet from then on.

Is converting PNG to JPG online safe on iPhone?

It depends on the converter. Tools that upload your image to a server pose a privacy risk because your file leaves the device. A browser-based converter that uses the HTML5 Canvas API processes the file locally inside Safari, which is verifiable: turn on Airplane mode after the page loads, and the conversion still completes. No server, no upload, no copy stored elsewhere.

How much smaller is JPG compared to PNG on iPhone?

JPG files run 60% to 90% smaller than the same image as PNG. A 4MB screenshot typically lands at 300KB to 500KB once converted, with no visible quality drop at 90% quality. The exact ratio depends on image content. Photos compress more than text screenshots, because JPG removes detail your eye does not pick up.

Why does my iPhone screenshot save as PNG instead of JPG?

iOS hard-codes screenshots to PNG to preserve every pixel of the screen exactly. Apple does not expose a setting to change this. The only way to get a JPG screenshot is to take the PNG screenshot first, then convert it using one of the methods above.

Can I convert multiple PNG files to JPG at once on iPhone?

Yes, with two of the three methods. Files app Quick Actions converts one image at a time. The Safari browser converter handles up to 50 files in a single batch. The Shortcuts app supports batch input through the Select Photos action with multi-select enabled. Pick the method that matches your batch size.

Does converting PNG to JPG remove the transparent background?

Yes. JPG does not support transparency, so any transparent pixels get filled with a colour. Most converters fill with white by default. If you need a different background colour, edit the PNG inside Photos or another image editor first, then convert.

Convert your first PNG in under ten seconds

Open Safari, head to the PNG to JPG converter, drop your screenshot, and tap download. No App Store, no signup, no upload. The whole conversion runs on your iPhone, and the JPG saves to your Files or Photos in seconds.