Which format should I use for the web?

WebP for nearly everything — it handles photographs and graphics, supports transparency, and is a quarter to a third smaller than the equivalent JPEG or PNG. Keep a JPEG fallback only if you must support genuinely old software.

Why can it not open my HEIC photographs?

Because only Safari ships the decoder, the codec being patent-encumbered. On an iPhone, changing Settings, then Camera, then Formats to “Most Compatible” makes the phone save JPEGs instead.

What happens to a transparent background in a JPEG?

It is filled with white, since JPEG has no alpha channel. Convert to PNG or WebP if the transparency needs to survive — particularly for a logo destined for a dark background.

Does converting a JPEG to PNG improve it?

No. The detail lost when it was first compressed is gone, and a PNG merely stores those artefacts losslessly in a larger file. Convert from an original, not from an already-compressed copy.

Convert Image

Move between JPEG, PNG and WebP.

Everything runs inside your browser. Your files never leave your device.

Drop your files here

.jpg, .jpeg, .png, .webp, .gif, .bmp, .avif · they stay on this device

Ask about Convert Image

Questions about what this tool does, which option to pick, or what it can and cannot handle.

The question you type here is sent to an AI provider to be answered — your files and whatever you put in the tool above are not, and the assistant cannot see them. Answers are generated and can be wrong. The tool itself is not guessing: it runs deterministic code on your device.

About the Convert Image

Image formats are not interchangeable, and picking the wrong one is the most common reason a page loads slowly or a screenshot looks smeared. This converts between JPEG, PNG, WebP and AVIF using the browser's own codecs.

The choice comes down to two questions. Does the image need transparency, and is it a photograph or a graphic? PNG is lossless and supports transparency, which makes it right for logos, icons, screenshots and anything with flat colour or text. JPEG is lossy, has no transparency, and is right for photographs. WebP does both and is smaller than either. AVIF is smaller still and slower to encode.

Converting to JPEG flattens transparency, and the tool fills it with white rather than producing a black background, which is what an unhandled alpha channel usually gives you. That is worth knowing before converting a logo with a transparent background for use on a dark page.

Conversion cannot undo previous compression. Turning a JPEG into a PNG produces a lossless copy of an image that already lost detail — the file gets larger and the artefacts stay exactly where they were. The conversion that helps is the other direction, or from a lossless original into a modern format.

HEIC is the one format that cannot be handled here and it is worth explaining rather than failing silently. Only Safari can decode it, because the codec is patent-encumbered and other browsers do not ship it. On an iPhone, setting Camera to "Most Compatible" produces JPEGs instead, which is the practical fix.

How to use it

1Drop in the images you want converted.
2Choose the target format: PNG for graphics and transparency, JPEG for photographs, WebP for the web.
3Set a quality level if converting to a lossy format.
4Download the results and compare the file sizes, which is usually the reason for converting in the first place.

Questions

Which format should I use for the web?: WebP for nearly everything — it handles photographs and graphics, supports transparency, and is a quarter to a third smaller than the equivalent JPEG or PNG. Keep a JPEG fallback only if you must support genuinely old software.
Why can it not open my HEIC photographs?: Because only Safari ships the decoder, the codec being patent-encumbered. On an iPhone, changing Settings, then Camera, then Formats to “Most Compatible” makes the phone save JPEGs instead.
What happens to a transparent background in a JPEG?: It is filled with white, since JPEG has no alpha channel. Convert to PNG or WebP if the transparency needs to survive — particularly for a logo destined for a dark background.
Does converting a JPEG to PNG improve it?: No. The detail lost when it was first compressed is gone, and a PNG merely stores those artefacts losslessly in a larger file. Convert from an original, not from an already-compressed copy.