How to convert PNG, JPG, and WebP on your phone or computer

QuickConvert is a website. On a computer you open Image Convert in the browser, drop files, and download the result. On a phone you open the same page. The drop area is a file input, so tapping it opens the phone’s file picker or photo picker. There is nothing to install, and there is also no background upload. The conversion runs in that browser tab. If the phone is low on memory, a very large image can fail even though a laptop would finish it. The 40 MB per-file limit and the 16,384 pixel per-side limit apply on both.

The tool converts among PNG, JPG, and WebP only. HEIC photos from an iPhone can be converted with HEIC to JPG first. GIF, AVIF, and PDF are not inputs. A PDF is not an image conversion; use the PDF tools if the file is a PDF.

Image Convert keeps the width and height. It decodes the picture, draws it at the original size on a canvas with high-quality smoothing, and encodes the format you chose. It does not resample to a new size. If you also need new dimensions, use Image Resize, which can set the format in the same pass. If you need a smaller file and the exact format is secondary, Image Compress can cap the long edge and choose Smart output, which turns PNG photos into JPG.

Quality starts at 90 and runs from 10 to 100 for JPG and WebP. PNG disables the slider. Ninety is a strong default when you are changing format and do not want a second, sloppier encode. Lower it only after you have looked at the download. A JPG converted to PNG at any quality setting does not get sharper. It gets larger, because PNG keeps the pixels without JPEG compression. Do that when a program insists on PNG, not when you are hoping to repair the photo.

Transparency survives in PNG and WebP. It does not survive in JPG. The page warns you when JPG is selected: transparent pixels are filled with white. A logo you meant to float on a colored background will show a white rectangle if you convert it to JPG. Convert that logo to PNG or WebP instead.

1. Open Image Convert.
2. Drop one or more PNG, JPG, or WebP files, or click the box and select them. Every file in the list uses the same output format.
3. Choose PNG, JPG, or WebP.
4. Set quality if the slider is active.
5. Click Convert and download. One file saves under the same base name with the new extension. Two or more files save as converted-images.zip, created in the browser. Unzip it to get the images.

Your originals are not replaced. If the browser saved the download into a folder you do not watch, check the downloads list before you assume the click did nothing.

1. Open the site in the phone’s browser and go to Image Convert. A current version of Chrome, Safari, Firefox, or Edge is enough. The page does not need a plugin.
2. Tap the drop area and allow the photo picker if the browser asks. Pick a JPG, PNG, or WebP. Picking several is fine if the picker allows it.
3. Choose the format. If you are sending the picture to a family group chat, JPG is the format most likely to display everywhere. If you are saving a logo, avoid JPG.
4. Tap Convert and download. The file lands in the browser’s download location, which on a phone may be the Files app or a downloads folder rather than the camera roll. If you need it in Photos, save it from Files into Photos. The website cannot place it in the camera roll for you.
5. If the tab reloads and the picture is gone, the conversion was only in memory. Run it again from the original. Nothing was stored on an account, because there is no account.

A phone that is offline after the page has fully loaded can still convert. The scripts have to be on the device first. Loading the page the first time needs a connection.

Open the result. For a photo, look at edges and fine detail if you lowered quality. For a logo, look at the background. White means you chose JPG or the source was already on white. A zip you did not want means more than one file was in the list. Clear the list and convert the one file.

“Must be a JPG, PNG, or WebP” and the 40 MB message are hard stops. Export a smaller or more ordinary file and try that. “Could not encode” usually means the browser could not finish the canvas export, or the dimensions are over the limit. Try another browser on the same device before you assume the file is special. Either way, the picture was not uploaded.

Repeated conversion from the newest download, especially through JPG, makes the picture worse each time. Convert from the best file you have.

The processing stays in the tab. QuickConvert does not receive the images. Analytics on the public site can record the page view, and the guide and tool pages may show an ad in the article. Those requests are not the image. The details are in the Privacy Policy and in privacy with online file tools. If you are still choosing a format, JPG vs PNG vs WebP is the comparison.