Image Converter

What is the Image Converter?

The Image Converter changes images between JPEG, PNG, and WebP formats in your browser. Format choice has a large effect on file size and on whether features like transparency are available.

Each raster format makes different trade-offs. JPEG compresses photographs efficiently but is lossy and has no transparency. PNG is lossless and supports transparency, which makes it right for graphics and screenshots but wasteful for photographs. WebP does both, generally producing smaller files than either.

Converting between them is therefore a practical decision rather than a cosmetic one. Moving a photographic PNG to JPEG or WebP commonly cuts its size by 70% or more, because lossless encoding is a poor fit for photographic data.

One direction deserves care: converting from a lossy format to a lossless one does not restore lost detail. A JPEG saved as PNG produces a larger file containing exactly the same visible artefacts, since the information was discarded when the JPEG was first encoded.

How to use the Image Converter

Upload your image. Select a JPEG, PNG, or WebP file. It is read locally.
Choose the output format. Pick the format suited to the image's content and how it will be used.
Set quality for lossy formats. When converting to JPEG or WebP, the quality setting controls the size and fidelity balance.
Download the converted image. The original file remains unchanged.

Worked examples

Format characteristics

Choosing correctly depends on the content of the image, not just on file size.

Input

        Lossy  Transparency  Animation  Best for
JPEG    yes    no            no         photographs
PNG     no     yes           no         graphics, UI
WebP    both   yes           yes        most web use

Output

WebP is the strongest general choice for the web
and is supported in all current browsers.

Where conversion helps and where it does not

The gain depends on whether the source format suits the content.

Input

Photo as PNG (4,200 KB)
  -> WebP q85:  290 KB   (93% smaller)
  -> JPEG q85:  380 KB   (91% smaller)

Screenshot as JPEG (180 KB)
  -> PNG:       240 KB   (larger, but text is crisp)

Output

Photographic content belongs in a lossy format.
Screenshots and flat graphics belong in a lossless
one, where JPEG artefacts around text are avoided.

Common use cases

Modernising an image library. Converting existing JPEG and PNG assets to WebP reduces total page weight substantially.
Meeting platform requirements. Some services accept only specific formats for upload.
Adding or removing transparency support. Moving a graphic to PNG or WebP when a transparent background is needed.
Reducing the size of photographic PNGs. Photographs saved as PNG are usually far larger than necessary.

Features and limitations

Converts between JPEG, PNG, and WebP.
Quality control when the target format is lossy.
Runs entirely in the browser via the Canvas API, with no upload.
Converting to PNG from a lossy source does not recover discarded detail, it only stops further loss.
Animated images are not preserved; conversion produces a single still frame.

Frequently asked questions

Are my images uploaded anywhere?

No. Conversion happens in your browser using the Canvas API, so files never leave your device.

Which format should I convert to?

WebP for most web use, since it is smaller than both alternatives and supports transparency. JPEG for photographs where maximum compatibility matters. PNG for screenshots, logos, and anything needing sharp edges or transparency.

Will converting JPEG to PNG improve quality?

No. The detail lost during JPEG encoding is gone permanently. The PNG will be larger and contain the same artefacts. Converting only prevents further degradation from re-encoding.

What happens to transparency when converting to JPEG?

JPEG has no alpha channel, so transparent areas are filled with a solid background, typically white or black. Use PNG or WebP if transparency must be preserved.

Is WebP safe to use?

Yes. It is supported in every current browser, including Safari since version 14. A picture element with a fallback source covers the rare legacy case.

Does converting strip metadata?

Generally yes. Re-encoding through the canvas discards EXIF data including GPS location, which is usually a privacy benefit when publishing images.

All processing happens locally in your browser, your data never leaves your device.

Original Image

Converted Image