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How to convert WebP to JPG on a Mac, offline
By Himanshu Ranjan · Updated 8 November 2026
To turn a WebP file into a JPG on a Mac, open it in Preview and use File > Export with JPEG, or select a whole folder of WebP files in Finder and run Convert › Convert to JPG in FileDial. Both run locally, so nothing is uploaded. FileDial saves each JPG beside the original and leaves the WebP untouched.
Why WebP files cause trouble
WebP is an image format Google announced in 2010. It can be lossy or lossless, it supports transparency and animation, and it usually makes smaller files than JPG for the same picture, which is why websites use it heavily. The catch is that you often save one by accident: right-click an image on a web page, choose save, and a .webp file lands in Downloads.
Plenty of places still reject it. Older email clients, some print shops, form uploaders, slide software and photo editors only take JPG or PNG. Converting to JPG is the lowest-friction fix because every app and every upload box understands it.
Convert a folder of WebP files with FileDial
If you have more than a couple of files, doing it one by one in an app is slow. FileDial works on a selection, so you pick all the WebP files at once and run one tool. The result for each file is a new JPG saved beside the original, and the WebP stays exactly as it was. Every run has Undo, and a result card shows the size before and after.
- In Finder, select the WebP files you want to convert (Command-A selects everything in a folder).
- Hold the right Option key to open the dial at the pointer, or right-click and choose Open in FileDial.
- Pick Convert, then release on Convert › Convert to JPG.
- Check the result card, then open the new .jpg files beside the originals. Use Undo if you want to roll the batch back.
The built-in way: Preview
Preview can open WebP on current macOS and export it as another format. Open the image, choose File > Export, open the Format pop-up menu and pick JPEG, then click Save. Apple's Preview guide also says you can convert several images at once by opening them in one Preview window, selecting them in the sidebar, and following the same export steps.
This is a good answer for one or two files. For a download folder with dozens, the sidebar approach gets fiddly, and you have to watch the quality slider and the file names yourself.
What you lose and keep when going to JPG
JPG is lossy and has no transparency. If your WebP has a transparent background, a JPG fills it with a solid colour, so use Convert › Convert to PNG instead when you need to keep the cutout. If the WebP is animated, a JPG keeps a single frame at most; see the GIF and animation articles in this series for moving images.
Quality also matters. A WebP that was already compressed hard will not get better as a JPG, and re-saving a lossy file as another lossy file adds a small generation loss. If the original was lossless WebP, you will see a mild drop at normal JPG settings. For web screenshots and downloaded photos this is rarely visible.
- Transparent areas become a solid fill in JPG.
- Animation is not kept in a JPG.
- Convert once, and keep the WebP if you may need it later.
Common problems when converting WebP
Two things go wrong most often. First, a download that has a .jpg name but is really a WebP inside, or the reverse, which makes some apps refuse it. Converting through a real tool fixes the mismatch, because the output is written in the format the name claims. Second, people convert a lossy WebP to JPG, then edit and re-save the JPG several times, which adds loss each time. Convert once, do your editing, and export the final copy once.
Colour can shift slightly if a file carries an unusual profile. If a converted picture looks duller than the original, run Convert › Convert to sRGB on it, which makes a converted copy with an sRGB profile, the standard assumed for web images according to Wikipedia. And when the pictures came from a web page, think about who owns them. A converter changes the format, not the rights, so check the licence before reusing images in your own work.
- Rename mismatched extensions only after converting, not before.
- Convert once and edit the JPG copy, not repeatedly.
- Use Convert to sRGB if colours look flat.
When FileDial is not the right tool
If you have one WebP and Preview is already open, use Preview. Starting an app for a single file is slower than File > Export. FileDial earns its place when there are dozens of files, when you want a size report, or when you want the conversion chained with another step such as Compress › Compress.
Also resist converting just in case. WebP is perfectly good on websites and in modern browsers, and keeping it avoids a lossy re-encode. Convert only the files that a particular app, person or upload form cannot take, and leave the rest alone. A habit of keeping both versions in clearly named folders, for example Originals and JPG copies, saves confusion later when you cannot remember which is which.
Why do this offline
Online WebP to JPG sites ask you to upload the file, wait, and download the result. For a public meme that does not matter, but the same habit gets applied to screenshots of documents, IDs and receipts. FileDial runs every tool on your Mac, files are never uploaded, and all tools work with Wi-Fi off. See the guide on whether online converters are safe for the reasoning and sources.
Questions
Can Preview open WebP files on a Mac?
Yes, on current macOS Preview opens WebP images and can export them through File > Export. If a particular file will not open, it may be damaged or an unusual variant. In that case try another viewer, or run the file through a batch tool such as FileDial to see if it can read it.
Will converting WebP to JPG make the file bigger?
Often yes. WebP is usually more efficient than JPG at the same visual quality, so the JPG tends to be larger. If size matters, run Compress › Compress on the result, or keep the WebP for your own website and only send JPG where a recipient demands it.
Does FileDial delete my WebP files after converting?
No. Each result is a new file saved beside the original, and the original is never changed unless a tool says so up front. Convert › Convert to JPG saves a new copy, and Undo is available on every result.
What if my WebP has a transparent background?
JPG cannot store transparency, so the see-through area becomes a flat colour. Convert to PNG instead, which keeps transparency. FileDial has Convert › Convert to PNG for that, and it saves a new copy beside the original. If a WebP is animated, only a single frame survives in a JPG, so use FileDial's GIF or video tools for moving images.