When to switch between lossless image formats

You may need to convert an image because an app will not open it, a website asks for a different format, or a transparent background has turned solid. Choosing another lossless format can preserve detail, but it will not restore detail already lost in a JPEG or a reduced-color GIF.

Use the Image Converter to make a copy in another supported format, then pick the format that fits how you will use the image. The converter works in your browser, and the files stay on your device.

Convert a copy and check the result

1. Open the Image Converter and load a copy of your image. Keep the original unchanged until you have checked the converted file.
2. Choose an output format based on where the image is going and whether it needs transparency or animation. The converter supports JPG, PNG, WebP, GIF, BMP, ICO, and TIFF.
3. Convert one image first. If you have many, check that the result looks right before converting the rest. The tool can handle up to 50 images at once.
4. Open the converted file in the app or website where you plan to use it. Check fine lines, text, colors, transparency, and animation if the image is animated.

A format conversion can change more than the file extension. Resizing, reducing the color palette, or choosing a lossy encoding can change the image too. If the output looks different, compare it with the original at the same size and on the same background.

Which format should you choose?

PNG for sharp graphics and transparency

Choose PNG for logos, screenshots, diagrams, icons, and artwork with transparent areas. PNG uses lossless compression, so it can preserve image detail without the blocky artifacts common in JPEG. It supports partial transparency, which lets soft edges blend smoothly into a background. Photos saved as PNG can be much larger than JPEG files, so PNG is usually not the best choice when small file size matters most.

WebP for smaller web images

WebP supports both lossless and lossy compression, transparency, and animation. A lossless WebP can be smaller than a PNG while preserving the image data, which makes it useful for web graphics. Check that the program or service receiving the file supports WebP. If you need a file for an older app or a workflow that expects PNG, use PNG instead.

GIF for simple animation or older compatibility

GIF can store animation and uses a palette of up to 256 colors per frame. It can work for simple, flat-color animations, but gradients and photographs can look rough because many colors are discarded. GIF transparency is also limited: a pixel is transparent or opaque, rather than partly transparent. For a still image with smooth transparency, PNG or WebP is usually a better fit.

BMP when a simple, broadly recognized bitmap is needed

BMP can store image pixels without lossy compression and is supported by many older Windows programs. It is often much larger than PNG or WebP because it may not compress the image efficiently. Choose it when a specific program requests BMP, not as a general way to make an image smaller.

TIFF for print and image workflows

TIFF is common in scanning, publishing, and print workflows. It can use lossless compression, but TIFF is a container that can also hold other compression types, including lossy ones. Different apps support different TIFF options, so check the settings and requirements of the program that will open the file. If it only needs a simple image for the web, PNG or WebP is often easier to share.

ICO for application and website icons

ICO is made for icons, not everyday photos. An ICO file can contain multiple icon sizes so a system or app can choose an appropriate one. Use it when a website, desktop shortcut, or program specifically needs an icon file. For a regular image, keep it in PNG, WebP, or another suitable format instead.

How to switch formats without surprises

1. Keep the original. Convert a duplicate, especially if the image matters for work, printing, or future editing. You can return to the source if the new file is incompatible or looks worse.
2. Preserve transparency. If the source has a transparent background, choose a format that supports it, such as PNG or WebP. JPG does not support transparency, so transparent areas become a solid background when saved as JPG.
3. Check whether the source is already lossy. A JPEG converted to PNG stays a JPEG-derived image. PNG will not remove its compression artifacts or recover the original detail. Converting from a lossy source to another lossless format only preserves what remains.
4. Match the destination. Use the format requested by the app, website, printer, or client. If there is no requirement, use PNG for transparent graphics, WebP for a smaller web image when supported, and JPEG for photographs when file size matters more than perfect pixel preservation.
5. Inspect the converted file. Zoom in on text, thin edges, and gradients. View transparent images over both a light and a dark background, and play animated files to confirm that the frames remain.

What lossless does and does not mean

A lossless format can reproduce the pixel data it was given after compression and decoding. It does not guarantee that a conversion leaves every property untouched. If a conversion changes dimensions, color depth, transparency, or color handling, the output may differ even when its compression is lossless.

When you need a dependable copy, keep the source file and verify the converted image in its intended destination. A visually similar preview is not a guarantee that a print or editing program will handle every format the same way.