Change format without an online uploader. Useful for WebP support, email-friendly JPGs, or PNG graphics.
Image Convert changes JPG, PNG, and WebP files from one of those formats to another without changing the pixel dimensions. Use it when a site rejects WebP, when you want a PNG graphic to stay lossless, or when you want a photo as WebP or JPG for a smaller file. The conversion is a canvas redraw in your browser: the image is decoded, painted at its original width and height, and encoded in the format you picked. It is not uploaded.
The format choices are PNG, JPG, and WebP. The quality slider runs from 10 to 100 and starts at 90. It is disabled for PNG because PNG does not take a quality setting. JPG and WebP use the slider. High-quality smoothing is on, which matters when the browser has to resample, though this tool does not resize on its own.
JPG cannot store transparency. If you convert a PNG or WebP that has transparent pixels to JPG, those pixels are filled with white first so the result is predictable instead of black or random. The page says so when JPG is selected. WebP and PNG can keep an alpha channel because the canvas is created with alpha for those formats.
One file downloads under the same base name with the new extension. A batch downloads as converted-images.zip, built in the browser. Each source file must be 40 MB or smaller, and neither side may exceed 16,384 pixels after the draw. Since this tool keeps the original dimensions, a source that is already over that edge fails when it is encoded.
To change size at the same time, use Image Resize, which can also pick the output format. To push a photo’s file size down and optionally cap the long edge, use Image Compress.
Photos usually belong in JPG or WebP. WebP is often the smaller of the two at a similar visual quality, but some older tools and some email clients still handle JPG more reliably. If the recipient is a person opening the file on an unknown computer, JPG is the safer delivery format. If you control the website, WebP is worth trying.
Logos, diagrams, screenshots with sharp edges, and anything with transparency belong in PNG, or in WebP if you have checked that transparency survives in the place you will use it. Do not convert a transparent logo to JPG and then wonder where the background went. It was painted white.
Converting JPG to PNG does not restore quality that JPEG already discarded. It only wraps the same pixels in a lossless file, which is often larger. Convert in that direction when a tool demands PNG, not when you hope to repair a blurry photo.
Keep the original until you have opened the converted file. Conversion here is a new encode, and a low quality setting is not reversible from the download.
The file type is rejected. HEIC, GIF, AVIF, BMP, and PDF are outside this tool. Convert HEIC with HEIC to JPG, or export another format to PNG, JPG, or WebP first. A file over 40 MB is rejected with a message about browser memory.
Transparent areas became white. You chose JPG, or you need a format with alpha. Convert again to PNG or WebP.
The PNG is larger than the JPG you started with. That is expected for photographs. PNG stores pixels without JPEG’s lossy reduction. Use PNG when you need it, not as a way to shrink a photo.
The browser could not encode the image, or the dimensions are over 16,384 pixels on a side. Another browser may work; a huge poster-sized PNG may not. The file still never left the device.
A batch produced a zip you did not expect. That is what happens when more than one file is in the list. Remove the extras if you wanted a single download, or unzip the archive.
Decoding, drawing, and encoding stay in the page. Each image’s object URL is revoked after that file is processed, including when a later file throws. The zip, if there is one, is assembled locally. QuickConvert does not receive the images and does not keep them after you close the tab.
Opening the page can still be measured by Google Analytics, and the article below the tool may show an AdSense ad, as described in the Privacy Policy. The image bytes are not part of those requests. The format tradeoffs are spelled out in JPG vs PNG vs WebP and in how to convert PNG, JPG, and WebP.
Image Convert opens a JPG, PNG, or WebP file in your browser, paints it at its original width and height, and saves it in the format you pick. For JPG and WebP, a quality slider (90 by default) sets how much detail the encoder keeps; PNG is lossless and has no slider. The pixel dimensions do not change. One file downloads under its own name with the new extension; several files download together as a zip. Nothing is uploaded.
Images saved from web pages are often WebP, and many forms still accept only JPG and PNG. Convert to JPG and upload again. Renaming the extension is not the same thing; the guide on why a website rejects your image covers this and other causes.
Convert a folder of product photos to WebP at quality 80 to 85, and compare file sizes with the JPG originals. Keep the JPGs as a fallback for email newsletters and older tools.
A full-screen PNG screenshot of a photo or video frame can be large. JPG at 85 to 90 brings it down while staying readable. For screenshots that are mostly text and interface, PNG often stays sharper and may not be much bigger.
JPG opens almost everywhere. If you are not sure what the recipient uses, JPG is the safe choice for photos.
No. JPEG has no alpha channel. Transparent pixels are filled with white so the result stays predictable.
How to change image format without uploading the file, including transparency, quality, and batch downloads on phone and desktop.
How JPG, PNG, and WebP differ on photos, screenshots, and transparency, and how QuickConvert treats each format.
How to tell a browser-side tool from an upload, and what QuickConvert still sends when your files stay on the device.
“Unsupported file type”, “file too large”, “invalid dimensions”: what each image upload error usually means, and how to fix WebP, HEIC, renamed files, and size problems.