Will my files get smaller if I convert HEIC to WEBP?

Not always. HEIC is already a very efficient format, and when you convert it to lossy WEBP the file size can stay similar or even grow on some photos. WEBP's real size advantage shows up against JPG, where it produces markedly smaller files. The genuine benefit of moving from HEIC to WEBP is not size — it is that WEBP works without friction in web browsers and on most platforms.

Is there quality loss in the conversion?

If you use lossy WEBP, yes — a second round of lossy compression is added. Since HEIC is lossy too, your image ends up having passed through two rounds of compression in total. At a sensible quality setting, however, the visible effect of that second round is indistinguishable on most photos under normal viewing conditions. To limit the risk, do not push the quality setting too low and do not re-save the same file repeatedly.

Can I open my WEBP files everywhere?

On the browser side WEBP is now a widely supported format, and modern operating systems open it natively. That said, some older desktop programs, corporate upload forms and prepress tools may not accept WEBP. If your goal in converting the archive is web publishing or viewing on modern devices, you will be fine; if you are handing files to a print shop or an older system, confirm acceptance first.

Are Live Photo and HDR data preserved?

The video component of a Live Photo is not preserved; only the main still frame is carried over to WEBP. The original Live Photo stays on your phone, but you cannot turn the WEBP output back into one. HDR and wide colour gamut information may also not survive the conversion chain intact, so the result can look slightly flatter. For photos where that data matters, keep the original HEIC.

Converting a HEIC Archive to WEBP to Save Space: A Practical Guide

Why are you converting the HEIC archive?

If you use an iPhone, your photo archive is most likely in HEIC. Apple made that choice for a good reason: thanks to HEVC-based compression, HEIC stores the same visual quality with markedly less data than JPG. From a phone-storage standpoint it is an excellent decision.

The trouble starts once the archive leaves the phone. Windows only opens HEIC after you install an extra codec. Websites, upload forms, sharing platforms and plenty of desktop programs do not recognise the file at all. So you end up with an archive that is technically excellent and practically unusable.

WEBP is a sensible target here. It is modern, efficient, broadly supported in browsers, and it has both a lossy and a lossless mode. This article walks through the conversion step by step — and sets a realistic expectation about size.

First, let's fix the size expectation

The title of this article says "save space," but to be honest we need to be clear about where the savings actually come from.

WEBP's famous size advantage is against JPG. At the same visual quality, WEBP produces files roughly a quarter to a third smaller than JPG. That is a real, measurable gain.

But HEIC is already a very efficient format. When you move from HEIC to lossy WEBP, the file size can stay at a similar level and on some photos grow slightly. In other words, "my archive will halve when I turn HEIC into WEBP" is not a realistic expectation.

The real space savings come from two scenarios. First, if you convert HEIC to WEBP rather than to JPG, you save considerably compared to the JPG route. Second, if you already store your archive as JPG, moving to WEBP produces a clear reduction. The main motivation for going from HEIC to WEBP, though, is not size — it is compatibility.

Step-by-step conversion

1. Transfer the archive to your computer correctly. On some transfer paths the iPhone automatically converts HEIC to JPG on your behalf. In that case you are stacking a second conversion on top of an already lossy file. To work with genuine HEIC files, set the transfer option to "keep originals."

2. Cull before you convert. The step that saves the most space in an archive conversion is not actually the conversion — it is deleting files you do not need. Ten shots of the same scene, blurry frames, screenshots: clear those out first. Then convert.

3. Test with a small sample group. Before processing the whole archive in one go, pick around ten photos of different types: a portrait, a landscape, a night shot, a document photo. Convert those and examine the results. Night shots and skies with wide gradients are the content that stresses compression the hardest.

4. Use the HEIC to WEBP converter and drag and drop your files. For batch conversions, keeping groups to a reasonable size makes the process easier to manage.

5. Inspect the output at 100% zoom. Look especially at the night shots and sky photos in your test group. If you see banding or softened detail, raise the quality setting and try again.

6. Do not delete the originals right away. Keep the HEIC originals somewhere until you have actually started using the converted results and stayed happy with them for a while. There is no way back from a lossy conversion.

Lossy or lossless WEBP?

WEBP has two modes, and this choice directly determines your result.

Lossy WEBP is the right mode for photographs. It keeps the size reasonable and preserves visual quality under normal conditions. This should be your default choice for an archive conversion.

Lossless WEBP discards no pixel information. It freezes the image coming out of HEIC exactly as it stands. But just like PNG, it produces very large files on photographic content because there is little repetition to pack. It also does not bring back the information HEIC discarded at capture time — it only preserves the current state. Choosing lossless mode for an entire archive delivers no visible benefit in exchange for the disk cost you pay.

The practical approach: lossy for photographs, lossless for the handful of files you intend to edit.

Post-conversion checklist

Once the conversion is complete, verify the following:

Do the file counts match? The number of HEIC files in the source folder should equal the number of WEBP files in the output folder. If any are missing, you probably have a corrupt or unsupported file.

Was the date information preserved? Capture dates are critical to archive organisation. Check the metadata of a few files after the conversion. If it has been lost, consider adopting a filename scheme that carries the date.

Does the target platform accept WEBP? If you plan to upload the archive to a cloud service, a website or a sharing platform, confirm that platform's WEBP support in advance.

In summary

The real benefit of moving from HEIC to WEBP is compatibility: you end up with a modern, efficient format that opens everywhere. On the size front, do not expect a dramatic win against HEIC — HEIC is already very good. But if you are converting HEIC to WEBP instead of to JPG, you save serious space relative to JPG. Cull before you convert, test with a small group, and hold on to the originals for a while.