Image Converter — Convert PNG, JPG & WebP

How to use Image Converter — Convert PNG, JPG & WebP

Three simple steps, with your content kept on your device.

Built for useful work

Fast, focused, and made to be clear on every screen.

What is an image converter?

An image converter changes a picture from one file format to another — for example, turning a JPG photo into a PNG or a WebP file. The image itself stays the same; only the container and encoding change.

Valestiom converts images between PNG, JPG, and WebP entirely in your browser. Your file is never uploaded, and the original stays untouched while a separate converted copy is created.

How to convert an image

Choose an image, pick the format you want (PNG, JPG, or WebP), adjust quality for lossy output, and press Convert image. The result appears with a preview and a Download button.

Conversion happens locally, so there is no queue and no waiting. You can convert the same image to another format as many times as you need.

PNG vs JPG vs WebP

PNG stores pixels losslessly, which keeps text and graphics sharp and supports transparency — the right choice for logos, screenshots, and images that need editing. JPG compresses photos efficiently but has no transparency and loses detail at low quality.

WebP combines modern compression with transparency and is often smaller than both for photos and graphics. Each format has its place, which is why this tool lets you convert between all three.

Common image conversions

The most frequent tasks are convert PNG to JPG when a file is too large or a site rejects PNG, and convert JPG to PNG when transparency or lossless editing is needed. Converting to WebP is popular for web performance because files tend to be smaller, and converting WebP to JPG helps when a platform does not accept WebP.

This converter covers those three formats in both directions, so there is no need to open a separate tool for each pair. Whatever the source format, the result is a clean file in the image format you picked.

Quality settings explained

JPG and WebP use lossy compression, where the quality slider controls how much detail is kept. Higher quality produces sharper, larger files; lower quality shrinks the file at the cost of visible artifacts on fine detail.

PNG is lossless, so quality does not apply the same way — the file keeps all detail from the source. This is why the slider appears only for JPG and WebP output.

Privacy: your image stays on your device

Conversion is performed locally in the browser, so your image never leaves your computer. There is no upload, no account, and no stored copy.

That makes the tool suitable for photos and graphics you prefer not to send to a third-party converter, and it works even when you want a quick private conversion. It also pairs with the Image Resizer and Image Compressor when a converted file needs different dimensions or a smaller size.

Quality slider range and default

The quality slider spans 10 to 100 per cent and defaults to 88, a setting that keeps most photographs visually clean while still cutting the file size noticeably compared with a lossless copy.

It only affects JPG and WebP output, because PNG is lossless and ignores the value entirely. Lowering the figure below roughly 60 starts to make compression artefacts visible around sharp edges and text.

One image per conversion

The converter takes a single image of up to roughly 80 MB per run, which keeps the preview and the chosen settings unambiguously tied to one file.

Settings persist between runs, so converting a set of images to the same format and quality means reselecting files rather than reconfiguring the controls each time.

Checking the result before saving

The converted image appears in a preview panel next to a Download image button, so the outcome can be inspected before anything is written to disk.

Because the original file is never modified, an unsatisfying result costs nothing: adjust the format or the quality, convert again, and compare until the output is right.

Frequently asked questions