Convert Images Online — Free & Private

PNG, JPG, WebP, AVIF and HEIC explained

Image formats are more than just file extensions. They are different ways to describe pixels, color, transparency and compression. PNG is a lossless format, meaning it keeps every pixel exactly. PNG is great for screenshots, logos, interface captures and graphics with sharp edges. JPG (or JPEG) is a lossy image format for photos. It gets rid of image detail that is generally hard to see in natural photographs, and creates much smaller files.

WebP and AVIF are newer, web-first formats. WebP often produces smaller files than JPG at the same visible quality and also supports transparency. AVIF usually compresses even more , especially for large photos . But encoding can take longer . HEIC is preferred by iPhones because it saves high quality photos in smaller size . Many websites and older apps still prefer JPG or PNG for compatibility .

Why convert PNG to JPG or WebP

PNG files are great for when you need accuracy, but they can get very large for photos. A camera photo saved in PNG can be many times larger than the same image saved in JPG, because photographic detail does not compress well with PNG lossless rules. Converting a photo-like PNG to JPG, WebP or AVIF can save on upload time, email attachment size and website bandwidth without altering the visible dimensions.

How to format the output file depends on where it is located. If you need maximum compatibility, JPG is the safest bet. WebP is a good default for modern websites, as it is widely supported and often smaller than JPG. AVIF is great if every kilobyte matters and your audience has modern browsers. PNG is still the answer if you need transparency, crisp text, or the ability to edit over and over again without generation loss.

How browser-based conversion works

PhotoTools decodes your image in the browser, draws the pixels to a canvas, and exports a new file in the format of your choice. This is not like server-side converters that upload the original image to a remote machine. Conversion in the browser keeps the work on your device, which is especially useful for private photos, identity documents, product images and screenshots that may contain sensitive information.

Canvas export also addresses the common loss of metadata in conversion. The browser only looks at the pixel data, not at camera info such as GPS coordinates or device model. In practice, changing the format will give you a clean image file, with the visible content preserved and any unnecessary metadata removed.

Quality settings and visible loss

When exporting to JPG, WebP or AVIF, the quality setting controls the balance between file size and visual detail. A higher number keeps more detail but creates a larger file. A lower number compresses harder and may introduce blockiness, blur or color banding. For everyday photos, JPG quality around 85 to 92 is a good starting point. For thumbnails, lower settings can be acceptable. For print or future editing, use a higher setting.

You’ll see lossy compression most clearly around sharp edges, small text, QR codes and flat color blocks. If the source image is a screenshot, chart or logo, PNG or lossless WebP may be better than jpg. If your source image is a natural photo, then JPG, WebP or AVIF will usually give you a much smaller file with little visible difference.

Private conversion workflow

The converter is designed for a local-first workflow. You can upload multiple files, choose the output format, adjust the quality and download the results without registration . Your original files stay in your browser session and are not uploaded to PhotoTools servers. If you close the tab, the working data that is temporary disappears with the page.

Save the original copy before conversion for best results. Use PNG for transparent graphics, AVIF when you are optimizing for modern web delivery . Use JPG or WebP for sharing . If your platform doesn’t support HEIC uploads, the easiest solution is usually to convert the file to JPG.

Common conversion mistakes to avoid

Most common mistake is to think of conversion as a magic quality upgrade. Converting a low-res JPG into PNG will usually increase the file size, but it will not recover detail that was lost earlier. Similarly, saving a transparent PNG as JPG causes the transparency to be lost, as JPG has no alpha channel. Use PNG, WebP or AVIF instead if the image needs transparent background.

Another error is to export the same photo multiple times in several lossy formats. Each JPG, WebP or AVIF export can cause some loss. This is a better workflow. Keep the original, edit once, and export the final delivery copy in the destination’s required format.

Conversion works best when coupled with practical naming and dimensions for SEO and website performance. Use WebP for modern web pages if supported Resize oversized camera photos prior to uploading Use a descriptive filename It is easier to use, loads faster and is still private because the processing happens in your browser.

Common conversions

If you know exactly what conversion you need, the dedicated pages below will pre-select the right output format and you can skip the picker and start dropping files right away.