What an image format converter does?
An image format converter changes the file type of a picture. It reads the pixels from your original file and writes them again in the encoding you choose, so a JPG can become a PNG, a WebP can become a JPG, or a BMP can become a WebP. The photo itself is the same picture; only the way it is stored changes.
This is a different job from editing the image. The converter does not crop, straighten or retouch anything, and it does not decide how many pixels wide the image should be. If your problem is the size of the image in pixels, use the Image Resizer in KB. If your problem is that a photo is too heavy but you want to keep the same file type, the Image Compressor is the right tool. The converter is for the case where the file type itself is the obstacle.
In one line: a format converter changes the container and encoding of an image — the type of file — not its dimensions and not its compression target.
Supported image formats
You can open five common image formats and save the result in four of them. Each format is good at something different, and the table further down compares them directly.
The everyday photo format. Small files, accepted almost everywhere, but it has no transparency and it is lossy.
Input & outputLossless and supports transparent backgrounds. Ideal for logos, screenshots, charts and images that contain text.
Input & outputA modern format that stays small at good quality and can carry transparency. Widely supported in current browsers.
Input & outputAn uncompressed bitmap. Files are large, but some older and technical programs expect this format.
Input & outputA simple animation format with a limited colour range. Browsers can read GIF but cannot write it, so GIF works as an input only.
Input onlyPopular image conversions
These are the format changes people reach for most often. Each button simply sets the output format in the converter at the top of the page — there are no separate pages behind them, and nothing changes until you press Convert.
If you need one specific pair converted in a dedicated tool, the site also has a WebP to JPG converter and a PNG to SVG converter for turning a bitmap into a vector file.
How to convert an image
- Add your image. Drop the file onto the box at the top of the page, or click it and choose a picture from your device. You can select several images at once.
- Pick the output format. Choose JPG, PNG, WebP or BMP from the “Convert to” menu.
- Set the quality, if it applies. The slider affects JPG and WebP only. For PNG and BMP the setting is switched off because those formats are saved without loss.
- Press Convert images. Each file is re-encoded one after another and a small progress bar tracks the queue.
- Download the result. Every finished image shows its old size, its new size and a download button. Save the files individually, or use Download all.
When you would need to change an image format
Format problems are usually caused by something outside your control: a website, a form or a piece of software that only accepts one specific file type. A few situations that come up often:
A transparency problem is one of the clearest cases. If you removed a background and the editor exported a WebP, converting it to PNG keeps the transparent area intact. If you then need to place that image on a coloured page, the Background Remover and the Image Crop Tool handle the editing side before you convert.
Another common one is a form or portal that insists on a particular type. Converting to JPG is usually the quickest fix, because JPEG output is accepted by nearly every system. If the same form also caps the file at a fixed size, convert first and then run the file through the compressor that targets 50KB.
Image format comparison
There is no single best format. The right choice depends on what the image shows and where it will be used. This table is a quick reference, not a ranking.
| Format | Best for | Transparency | Animation | Typical use |
|---|---|---|---|---|
| JPG | Photographs and camera images | No | No | Email, forms, printing, any system that only accepts JPEG |
| PNG | Logos, screenshots, text, sharp edges | Yes | No | Icons, charts and images placed over another background |
| WebP | Web pages that need small files | Yes | Yes | Modern websites, app assets, faster page loads |
| GIF | Very short simple animations | Limited (1-bit) | Yes | Reaction images and small looping clips |
| BMP | Legacy and technical software | No | No | Uncompressed bitmaps where the format is required |
For a website, WebP is a safe default for both photos and graphics because it keeps files small at good quality. PNG is the better pick whenever an image has to sit on top of something else or includes fine text. JPG remains the most universally accepted format when compatibility matters more than file size.
How conversion affects quality, size and transparency?
Converting between formats is not a neutral operation. Four things can change, and it helps to know which ones will affect your file.
- File size. It usually moves. Saving a BMP as JPG shrinks the file a lot, while turning a JPG into an uncompressed BMP can make it several times larger.
- Transparency. PNG and WebP can hold a transparent background; JPG and BMP cannot. Converting to JPG or BMP fills empty areas with white.
- Animation. Only GIF and WebP can animate. Converting an animated file to JPG or PNG saves a single still frame.
- Image detail. JPG and WebP are lossy, so a low quality setting removes some fine detail. PNG and BMP are lossless and keep every pixel, at the cost of a bigger file.
Because of this, no converter can promise that a file will look identical after a change of format. The realistic goal is to pick an output that suits where the image is going. Keep the quality slider high when the image is a photograph you care about, and lower it when you only need a small file for the web. If size is the real problem, reducing the image resolution or using MB to KB conversion will help more than changing the format alone.
Where your images go
Your images are not uploaded anywhere. The converter opens each file in the browser, draws it onto an off-screen canvas and writes the new file using the browser's own image encoder. That happens on your own device. Nothing is sent to a server, there is no queue behind the scenes and there is no account to create.
Two details are worth being precise about. The page loads a web font and an icon font from public CDNs, which is a normal request for text and icons and does not involve your image. And because the work is done locally, closing or reloading the tab clears everything — so always save the converted files before you leave. If you are on a shared computer and the image is sensitive, download the result and close the tab when you are finished.