A photographer comes back from a shoot with 300 HEIC files and the client's portal only accepts PNG. A familiar Tuesday. The fix takes minutes, but doing it without wrecking quality or file size is where most people slip — so let's do it properly.
HEIC vs PNG at a glance
| Format | Compression | Transparency | Animation | Support (2026) |
|---|---|---|---|---|
| HEIC | Lossy | Yes | No | iPhone, iPad and macOS natively; Windows needs the HEVC extension |
| PNG | Lossless | Yes | No | every browser since the early 2000s |
Read the support column first; in most conversions that row alone is the entire motivation.
The real reasons people convert HEIC to PNG
HEIC (High Efficiency Image Container) is a lossy format made for iPhone and iPad photos, Apple ecosystem. Its weak spots — poor Windows support, not web-compatible, limited sharing options — are exactly where PNG steps in.
PNG (Portable Network Graphics) handles logos, transparency, screenshots, web graphics, and in 2026 its support looks like this: every browser since the early 2000s. On size, the practical picture: a 1080p screenshot is typically 150-400 KB; a 12-megapixel photo can exceed 15 MB.
In practice the push comes from three places: platform requirements, collaboration with people on other tools, and plain file-size pressure.
How to do it (no software installed)
Open the PNG converter and drop your HEIC file onto the upload area. Multi-select works, so a whole folder of files goes in at once — useful when a shoot or an export produced dozens of them.
Start the conversion and watch the size readout: the page shows the output weight before you commit to downloading. That single number answers most of the questions people bring to guides like this one.
When the batch finishes, grab the ZIP rather than clicking files one by one — it preserves the original filenames with the new extension.
Nothing installs, nothing asks for an account, and the upload is deleted from the server after processing. The whole loop, from drag to download, runs well under a minute for ordinary files.
Before you convert: a 30-second checklist
Keep the original. Conversions into lossy formats are one-way; the HEIC you started from is your archive copy, so it never gets deleted or overwritten.
Check the destination's rules. If a platform or print shop asked for PNG, it often also has size or resolution limits — knowing them now saves a second round trip.
Group the batch. Converting fifty files in one upload beats fifty single conversions, and the ZIP you get back keeps the set together with its filenames intact.
What actually happens to quality
HEIC uses lossy compression; PNG uses lossless. Going from lossless to lossy means some pixel data is discarded — usually invisible at sensible quality settings, but it is a one-way door, so keep the original.
For scale: about half the size of an equivalent JPEG — Apple's claim since iOS 11, and it holds up. After conversion to PNG, expect the relationship to shift — a 1080p screenshot is typically 150-400 KB; a 12-megapixel photo can exceed 15 MB.
Photoshop's "Save for Web" gives the same result with more dials; if you don't already pay for Adobe, you don't need to start for this.
Check the result at 100% zoom, not fitted-to-window: scaling hides exactly the artifacts you are checking for.
What happens to EXIF and metadata
Every photo from a camera or phone carries hidden baggage: capture date, device model, exposure settings and — on phones — often GPS coordinates. Conversion is one of the moments where that baggage can be kept or dropped.
Photographers archiving work want the opposite — capture data is part of the record — so they convert copies for sharing and keep HEIC originals untouched.
The practical rule: treat the original as the metadata archive and the converted copy as the public version. That division of labour answers most privacy and copyright questions before they come up.
Converting at scale
Past a certain volume the bottleneck moves from conversion speed to organization. Name files before converting, not after — the converter preserves names, so a clean naming scheme going in is a clean archive coming out.
Recurring jobs deserve a recurring habit: same folder structure, same batch size, same checks. Boring beats clever at five hundred files.
Where PNG files go next
Once your files are PNG, they slot into workflows HEIC could not reach: logos, transparency, screenshots, web graphics. If you handle this pair often, the our PNG format guide covers the deeper trade-offs.
A worked example, with numbers
Take a typical case: about half the size of an equivalent JPEG — Apple's claim since iOS 11, and it holds up. Convert that to PNG and the format's profile takes over: a 1080p screenshot is typically 150-400 KB; a 12-megapixel photo can exceed 15 MB. The percentages vary with image content — flat-color graphics and detailed photos compress very differently — so trust the size readout on your own files over any blog's average.
Troubleshooting the usual suspects
Colors shifted. Wide-gamut originals viewed in sRGB-only software look washed out. The fix is converting from an sRGB copy for web use — not a higher quality setting.
The file will not open. Nine times out of ten the viewer is the limitation, not the file. Try a second viewer before blaming the conversion, or convert to PNG — if that copy opens, the original was fine all along.
Transparent areas turned white. The target format has no alpha channel; flattening is the documented behaviour, not a bug. Re-convert to PNG or WebP if transparency must survive.
The file got bigger. Some content genuinely compresses worse in the new format — flat graphics in photo-oriented codecs, photos in graphics-oriented ones. The size readout before download is the early warning.
How the compression actually works
Lossy compression throws away detail the eye is bad at noticing — fine texture, subtle color steps — and keeps what perception cares about. That is how a photo drops 80% of its weight while looking identical at arm's length; it is also why each re-save discards a little more.
Lossless compression is bookkeeping, not deletion: repeated patterns get written once with a count, and decompression rebuilds every original pixel exactly. The price is that random, noisy content — photographs — barely shrinks.
Once you see the mechanism, every size difference in this article stops being magic and starts being arithmetic.
Mistakes that cost quality
Don't upscale before converting — extra pixels invent nothing and inflate the file. Don't convert a screenshot with text into a heavily lossy format if crisp edges matter. And keep the HEIC originals archived; storage is cheaper than regret.
None of these ruin a file instantly — they compound across a library, which is why they go unnoticed until the damage is wholesale.
The Core Web Vitals angle
Images are usually the heaviest asset class on a page, so format choice flows straight into Largest Contentful Paint — the Core Web Vitals metric Google weighs for ranking. Lighter images, earlier paint, better scores: the chain is that direct.
The compounding is what surprises people: 200 KB saved per image across a forty-image page is eight megabytes a visitor never downloads.
Measure before and after with PageSpeed Insights — the image-weight line item makes the improvement concrete instead of theoretical.
Platform quirks worth knowing
Messaging apps and social platforms recompress whatever you send — WhatsApp and most social feeds will re-encode your carefully converted PNG anyway, so don't chase perfection for those destinations. Email clients are stricter: attachments survive untouched, which makes format choice matter more there.
CMS uploaders are the third trap: many enforce size limits or a format whitelist. If an upload bounces, the platform's allowed-formats list — not your file — is usually the explanation.
Frequently Asked Questions
Can I convert several HEIC files at once?
Yes — drop the whole selection into the PNG converter and you get the results back as one ZIP. Batch jobs of 30-50 files are routine; the per-file time stays in the seconds.
Why does my PNG file open differently on Windows and Mac?
Support differs by platform: every browser since the early 2000s. If a recipient cannot open the file, that mismatch is usually the cause — convert to a more universal format like JPEG or PNG for sharing.
What happens to transparency when I convert?
Transparency survives when both formats support an alpha channel; here the relevant fact is that PNG does support it, so nothing is lost.
Can I convert the PNG back to HEIC later?
Yes, the reverse converter exists — but a round trip through a lossy format does not restore discarded data. Treat the original HEIC as the master copy and convert from it each time, rather than chaining conversions.
Does converting change the image dimensions?
No. Width and height in pixels stay exactly the same; only the encoding changes. If you also need resizing, do it as a separate, deliberate step — and always downscale, never upscale.
Why did my converted file come out larger?
Content sits on different compression curves: a file that HEIC encodes efficiently can genuinely grow as PNG. It is normal for some images, which is why the size readout before download matters more than any rule of thumb.
If this pair comes up often in your work, bookmark the PNG converter — the second conversion takes ten seconds, because you'll skip the reading.
Written by Giovanni Picaro, a web developer who has been building image tools and optimizing sites since 2019. Sources: MDN image format reference and Google web.dev. Last reviewed: 2026.