The simplest way to change a photo's file type

You can change a photo from one file type to another using built-in tools on your computer or phone — you do not need to buy software or use a website. On Windows, the Photos app or Paint can save a JPEG as a PNG. On Mac, Preview does the same. On iPhone or Android, most photo apps let you export in different formats. The steps differ slightly by device, but the principle is the same: open the photo, choose "Save As" or "Export," and pick a new format from the menu.

The file type you choose depends on what you need the photo for. JPEG works well for photos you are sharing online because the file stays small. PNG is better if you need a transparent background or plan to edit the image later. WebP is newer and creates even smaller files, but not all devices or websites accept it yet. GIF is mainly for animated images. Understanding which format fits your situation saves you from converting the same photo multiple times.

Key Takeaways

  • Windows Photos app, Mac Preview, and phone photo apps all have built-in export or save options that let you pick a new file type without installing anything.
  • JPEG is smallest and works everywhere; PNG preserves quality and allows transparent backgrounds; WebP is newer and smaller but has limited support.
  • Converting a photo does not delete the original — the new file type is saved separately, so you keep both versions.
  • Some websites or programs only accept certain file types, so check what format is needed before you convert.

Changing file type on Windows

Open the photo in the Photos app (built into Windows 10 and 11). Click the three dots in the top right corner, then select "Edit." At the top of the editing window, click "Save a copy." A dialog box appears asking where to save the file and what to name it. At the bottom of that dialog, you will see a dropdown that says "JPEG" or "PNG" — click it and choose your new format. Then click "Save."

If you prefer not to use Photos, open Paint (search for it in the Start menu). Drag your photo into Paint, or go to File > Open and select the photo. Then go to File > Save As. A dialog opens. At the bottom, next to "Save as type," click the dropdown and choose from BMP, GIF, JPEG, PNG, or TIFF. Type a new filename if you want, then click Save. The original photo stays unchanged; Paint creates a new file in the format you picked.

Changing file type on Mac

Right-click the photo and select "Open With" > "Preview." Once Preview opens, go to File > Export. A dialog appears. At the bottom, next to "Format," click the dropdown menu. You will see options like JPEG, PNG, TIFF, and others. Choose the one you need. You can also adjust the quality slider if you want — moving it left makes the file smaller but slightly blurrier; moving it right keeps more detail but makes the file larger. Type a new filename if you want, pick where to save it, then click Save.

If you have multiple photos to convert, Preview can speed this up. Open Preview, then go to File > Open and select all the photos you want to convert at once (hold Command and click each one). Go to File > Export, choose your format, and click Save. Preview will convert all of them and save them with the same names in the folder you picked.

Changing file type on iPhone

The Photos app on iPhone does not have a direct "export as" option, but you can work around this. Open the photo, tap the share button (the box with an arrow), scroll down, and look for an app that exports photos — common choices are Files, Mail, or a cloud service like Google Photos or OneDrive. Tap the app, and it will usually ask what format you want. Not all apps offer this, so you may need to try a couple.

A more reliable method is to use a free app from the App Store designed for this purpose. Search for "image converter" or "photo format converter" and read the reviews before downloading — look for apps with thousands of ratings and recent updates. Open the app, select your photo, choose the new format, and tap export. The converted photo saves to your Photos app or to Files, depending on the app.

Changing file type on Android

Android phones do not have a built-in converter in the default photo app, so you will need a free app from Google Play. Search for "image converter" or "photo converter" and choose one with good reviews and recent updates. Download it, open it, and select the photo from your phone. The app will show you format options — tap the one you want, then tap "Convert" or "Export." The new file saves to your phone's storage, usually in a folder called Downloads or Pictures.

Some Android phones come with Samsung Gallery or Google Photos pre-installed. Google Photos does not have a format converter built in, but you can use Google's web version: go to photos.google.com on your phone's browser, open the photo, click the three dots, and look for an export or download option. This method is slower than using an app but works if you do not want to install anything new.

When to use each file type

JPEG is the standard for photos. It compresses the image to make the file small, which is why photos from cameras and phones are usually JPEG. Use JPEG when you are uploading to social media, sending by email, or storing photos to save space. The trade-off is that JPEG loses some detail every time you save it, so if you plan to edit a photo many times, convert to PNG first.

PNG keeps all the detail from the original and allows transparent backgrounds (areas that show through instead of being white or colored). Use PNG for edited photos you want to keep high quality, for graphics with text, or when you need a transparent background. PNG files are larger than JPEG, so they take up more storage and upload slower, but the quality stays perfect no matter how many times you save.

WebP is newer and creates smaller files than JPEG while keeping better quality. Google and other tech companies are pushing WebP as the future standard. Use it if you are building a website and want fast load times. However, older phones, cameras, and some websites do not recognize WebP yet, so check before you convert.

GIF is mainly for animated images or simple graphics. If you have a still photo, there is no reason to use GIF — it will actually make the file larger and look worse. Use GIF only if you need animation or are working with a very old system that does not support other formats.

What happens to the original photo

Converting a photo to a new file type does not change or delete the original. When you save or export, you are creating a new file with a different name and format. Both versions exist on your device. For example, if you convert "vacation.jpg" to PNG, you will have both "vacation.jpg" and "vacation.png" taking up storage space. If you want to delete the original after converting, you can do that manually — just make sure the new version is saved first.

This is why it is safe to experiment with different formats. If you convert a photo and do not like how it looks, you still have the original to try again. Just be aware that if you edit the photo in one format and then convert it, the edits travel with it — converting does not undo changes you made.

Frequently Asked Questions

Will converting a photo make it look worse?

It depends on the format. Converting from JPEG to PNG will not make it worse — PNG just stores the same image in a different container. Converting from PNG to JPEG might make it slightly blurrier because JPEG compresses the image. Converting from JPEG to JPEG again will make it worse each time because JPEG loses detail with every save. Always convert from the original if you can.

Why does my phone not recognize the new file type?

Some older phones or apps only support certain formats. If you converted to WebP and your phone will not open it, convert to PNG or JPEG instead. If you converted to GIF and it will not play, the app might not support animated GIFs. Check what format the app or website needs before you convert, or try opening the file in a different app.

Can I convert a photo back to its original format?

Yes, you can convert it back the same way you converted it the first time. However, if you converted from JPEG to PNG and then back to JPEG, the final JPEG will look worse than the original because the first JPEG conversion already lost detail. Keep the original file if you think you might need it later.

What is the smallest file type for photos?

WebP creates the smallest files while keeping good quality, but not all devices support it. JPEG is the next smallest and works everywhere. If you need the absolute smallest file and do not care about quality, GIF is smaller, but it looks grainy. For most people, JPEG is the best balance of small size and good quality.

Do I need internet to convert a photo?

No. Using the built-in tools on Windows, Mac, iPhone, or Android does not require internet. If you use a website to convert photos, you will need internet, but the apps and methods described here all work offline.