PixHeic
Convert HEIC to PNG for Twitch Emotes
Twitch requires transparent PNG emotes at three exact sizes. Start by getting the format right — convert below.
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Convert HEIC to PNG now
Drop your .heic files into the converter and download lossless PNGs with any transparency intact. Decoding runs on your device via WebAssembly, so nothing is uploaded to a server.
Open the PNG converter Free, no sign-up, no watermark. Alpha channels are preserved.Zero uploads
The decoder runs in your browser via WebAssembly. Your files never touch a server, so there is nothing to retain, leak or subpoena.
Transparency preserved
If your source carries an alpha channel, it survives the conversion intact. PNG is the only common photo format that keeps it.
Lossless output
PNG stores every pixel exactly. Re-saving a sticker ten times leaves it identical to the first save, unlike JPEG.
Why Twitch is stricter than most
Twitch emote uploads are checked hard: PNG only, transparent background expected, and three specific pixel sizes so the emote renders correctly in chat, in the emote picker and on hover.
HEIC is not accepted at any stage, and no browser-based uploader could decode it if it were. Converting to PNG is the first of two steps.
The second step is the crop
Twitch has historically required 112 × 112, 56 × 56 and 28 × 28 versions of each emote, and it updates these requirements periodically — check the Creator Dashboard for current figures rather than trusting any guide, including this one.
The Twitch emote preset produces the 112 px square directly; run the file through again at a smaller preset for the other sizes. Emotes read at 28 pixels, so simplify the artwork ruthlessly: detail that looks great at 112 becomes mush at 28.
Converting preserves transparency — it does not create it
PNG supports an alpha channel, and this converter carries one across if your source already has one. A normal photo taken on a camera has no transparency, and converting it to PNG will not cut the subject out — you will get the same picture with the same background, in a larger file.
To get a transparent subject, remove the background first. On an iPhone, press and hold the subject in Photos to lift it out, then share it as an image; on a desktop, use the background removal in your editor of choice. Convert afterwards and the transparency comes through.
Frequently asked questions
Will my transparent background survive the conversion?
Yes, if the source has one. HEIC supports an alpha channel and PNG preserves it, so a lifted subject or an edited cut-out comes through with its transparency intact. What conversion cannot do is add transparency to a photo that never had it.
Does this tool resize images to the required dimensions?
Yes. The converter has an Output size control with presets for the common targets — Discord and Slack emoji at 128 px, Twitch emotes at 112 px, stickers and avatars at 512 px — each of which centre-crops to a square and scales the longest edge down as it converts.
Large reductions are done in halving steps rather than one draw, which is what keeps a 128 px emoji from looking crunchy. Images are never enlarged: ask for 512 px from a 300 px source and you get 300 px.
Do Twitch emotes have to be transparent?
In practice yes. Twitch renders emotes over chat backgrounds that vary by theme and extension, so an opaque rectangle looks broken. If your source has no alpha channel, remove the background before converting — PNG preserves transparency but cannot invent it.
Is anything uploaded to a server?
No. PixHeic decodes your file with a WebAssembly build of libheif that runs inside your own browser tab, so the image is read from your device into memory and converted there. You can confirm it in your browser's Network tab, or disconnect from the internet after the page loads and convert anyway.