How to convert an image set to one format

Your photo archive may contain a mix of JPG, PNG, WEBP, and other files. Converting a group to one format can make it easier to browse, share, or import, but the format you choose affects image quality, file size, transparency, and compatibility.

Use the Image Converter to convert up to 50 images at once in your browser. Before you start, keep the originals: a converted copy is not a replacement for the source file, especially if the conversion changes quality or metadata.

Convert the image set

1. Make a copy of the archive folder or select copies of the images you want to convert. Keep the original files unchanged until you have checked the results.
2. Open the Image Converter and add up to 50 images. If the archive has more, work through it in smaller batches.
3. Choose one output format for the whole batch. If you are unsure, decide based on how you will use the archive, not just on which format gives the smallest files.
4. Convert the images, then save the output files in a new folder. Keep that folder separate from the originals so you can compare them and avoid accidental overwrites.
5. Open a few converted files from different parts of the set. Check that they display correctly, look as expected, and have the orientation you want before converting the rest.

Choose a format for the archive

There is no single best format for every photo collection. Consider what devices and programs need to open the files, whether transparency matters, and whether reducing file size is more important than preserving every pixel.

Choose JPG for broad compatibility

JPG works with nearly every photo viewer, phone, and computer. It is usually a practical choice for everyday photographs when smaller files matter. JPG uses lossy compression, which discards some image data. Repeatedly saving an image as JPG can reduce quality, so keep the original and avoid converting the same image again and again.

Choose PNG when you need lossless output

PNG keeps image data without the lossy compression used by JPG and supports transparency. It can be useful for graphics, screenshots, and images with transparent areas. For ordinary photographs, PNG files are often much larger than JPG files, and converting a JPG to PNG does not restore detail that was already lost.

Choose WEBP for smaller files in compatible software

WEBP can make compact files and supports transparency. It is convenient for web use and works in many current browsers and applications, but older photo software and devices may not open it. If you need the archive to work with older equipment, test WEBP on those devices before converting the whole collection.

Choose TIFF when your workflow expects it

TIFF is used in some scanning, printing, and image-editing workflows. It can create large files, and not every viewer handles every TIFF variant the same way. Use it when a specific program or process requires TIFF, rather than assuming it is automatically a better archive copy.

GIF is limited to a small color palette and is generally not a good choice for ordinary photographs. BMP files can also be much larger than compressed formats. If your source images already use a suitable format, leaving them as they are may be better than converting them just to make the extensions match.

Fix common conversion problems

1. Split a large collection into batches. The Image Converter supports up to 50 images at once. Convert a smaller group, check the output, then continue with the next group. Use clear batch names or folders to keep track of which files are finished.
2. Try a copy if a file will not open. The converter supports JPG, PNG, WEBP, GIF, BMP, ICO, and TIFF. A file with a familiar extension can still be damaged or encoded in a way the browser cannot read. Open it in a viewer first, then try another copy of the file if available.
3. Use a different format if the result is too large. PNG and TIFF may take substantially more space than JPG or WEBP for photos. Compare a few representative images before committing to a format for the full archive.
4. Check orientation before deleting anything. A photo can rely on orientation information in its metadata to display upright. If a converted copy appears rotated or sideways, keep the original and do not replace it until you have found a workflow that preserves the orientation you need.
5. Keep originals when dates or camera details matter. Image files can contain metadata such as capture date, camera model, location, and color information. Conversion may change or remove metadata, so compare important details on sample files and retain the source files if those records matter.
6. Check available space before a large batch. Converted files may be larger than the originals, especially when changing photos to PNG or TIFF. Leave room for both the original collection and the new copies until you have verified the archive.

Keep a reliable archive copy

Converting formats is mainly a convenience step. It does not improve a low-resolution image, restore details removed by earlier compression, or guarantee that the new file keeps every piece of metadata. If the photos are important, keep an untouched copy of the original collection on a separate drive or another backup location.

The conversion runs in your browser, and the images you open stay on your device.