Image converter

PNG is lossless and keeps transparency. Use it for screenshots, logos, diagrams, and anything with flat colour or text. It is the wrong choice for photographs, where it produces files several times larger than JPG for no visible gain.

JPG is lossy and has no alpha channel. Use it for photographs and for anywhere that needs the widest possible compatibility. Every re-save loses a little more detail, so convert from the original rather than from a previous JPG.

WebP gives photo-grade compression and transparency in the same file, usually at a smaller size than either. Every current browser reads it. Older desktop software sometimes does not, which is the only real reason to avoid it.

Converting a PNG or WebP with a transparent background to JPG cannot keep that background, because the JPG format has no channel to store it in. Every transparent pixel has to become a solid colour.

This converter fills it with white by default and lets you pick another colour. If the image is a logo destined for a dark page, set the fill to the colour of that page rather than accepting a white box around it, or convert to PNG or WebP and keep the transparency.

Converting a JPG to PNG does not restore the detail the JPG discarded. It stores the already-damaged image losslessly, usually in a much bigger file. The same is true of WebP to PNG.

The rule that follows: always convert from the original file. If you need several formats, export each one from the original rather than chaining conversions.

Are my images uploaded to a server?

No. The conversion happens in your browser using the canvas API, so the image data never leaves your device. You can watch it work with your network disconnected.

Why does my PNG lose its transparent background when I convert it to JPG?

JPG has no alpha channel, so transparency cannot survive the format. Every transparent pixel has to become a solid colour, and this converter fills it with white by default. If you need the transparency, convert to PNG or WebP instead.

Which format should I pick?

PNG for screenshots, logos and anything with transparency or flat colour. JPG for photographs, when you want the smallest file and the widest compatibility. WebP for the web, when you want photo-grade compression and transparency in the same file.

Does converting PNG to JPG and back restore the original quality?

No. JPG throws away detail to save space, and converting the result back to PNG only preserves the damaged version. Always convert from your original file rather than from an earlier conversion.

Is there a file size limit?

The limit is your device's memory rather than an upload cap. Very large images, above roughly 50 megapixels, can be slow on a phone because the whole bitmap has to be held in memory.

Can I convert HEIC photos from my iPhone?

Only if your browser can decode HEIC, which Safari on Apple devices can and most other browsers cannot. If the preview stays empty, the browser could not read the file, and the fastest fix is to export it as JPG on the phone first.