Convert Image Format Online
Turn a JPEG, PNG or WebP into any of the others. One file, one pass, no upload and no account.
Format settings
Leave on Detect to accept JPEG, PNG or WebP.
WebP is usually the smallest of these at the same quality.
JPEG, PNG, WebP · up to 20 MB
Your image never leaves your device — the work happens here, in this browser tab. No account, no watermark.
Converting an image between formats means decoding it back to raw pixels and writing those pixels out again with a different encoder: the picture keeps its exact dimensions, and only the way it is stored — and therefore the file size — changes. On Resizo you choose what you have under From and what you want under To, add the file and press Convert; JPEG, PNG and WebP go in and come out in any combination. The decoder and the encoder are both small programs the page loads into your browser, and your own device runs them, so the file itself never leaves your computer.
How to convert an image
- Pick the format you want out of the To menu. Leave From on Detect unless you want the drop zone to accept only one kind of file.
- Choose the image on your device. Drop it onto the panel above, or press Browse files. Up to 20 MB. The file is opened where it already is, so there is no transfer to sit through.
- Press the Convert button. It is labelled with the format you picked. Your device decodes the picture and writes it out again in the new format, at the same pixel dimensions.
- Download the converted file. The result panel shows the new size next to the old one before you keep it.
PNG to JPG
This is the most common conversion people need, and it is almost always about size. A photograph saved as PNG stores every pixel exactly, so a 12-megapixel shot can sit at 20 MB; the same picture as a JPEG is usually well under 2 MB and looks the same on a screen.
The one thing to watch is transparency. JPEG has no alpha channel, so any transparent area is filled with black on the way out. That is fine for a photograph and wrong for a logo — for a logo, convert to WebP instead, which keeps transparency and is smaller than PNG anyway.
JPG to WebP
WebP typically produces a file 25 to 35 percent smaller than a JPEG at the same visual quality, and every current browser displays it. If you are preparing images for a website, this is the conversion that makes the page lighter without changing a single pixel dimension.
Keep the JPEG original if the image will be edited later. Converting from one lossy format to another re-encodes the picture, and repeating that many times over will eventually show.
WebP to JPG or PNG
The reason people search for this is almost always the same: they saved an image from a website, and now a form, an older photo editor or a print shop refuses to accept it. WebP is a web format first, and plenty of desktop software still has no idea what to do with one.
Convert to JPG for a photograph, or to PNG if the image has transparency you need to keep — a product cut-out or a logo, for example. PNG output is lossless, so nothing is thrown away in the second step.
Which format should I choose?
| Format | Transparency | Compression | Typical size | Best for |
|---|---|---|---|---|
| JPEG | No | Lossy | Small | Photographs, and anything an upload form insists on |
| PNG | Yes | Lossless | Large for photos | Logos, icons, screenshots, flat graphics |
| WebP | Yes | Lossy or lossless | 25–35% under JPEG | Anything on a website today |
Pages for one conversion in particular
- A photograph saved as a PNG, many times heavier than it needs to be — PNG to JPG
- Something downstream demands a PNG and will not take the JPG you have — JPG to PNG
- Photos going onto a web page, where 30 percent off every file is the whole point — JPG to WebP
- A transparent graphic that has to get smaller and stay transparent — PNG to WebP
- You saved an image from a web page and now nothing on your computer will open it — WebP to JPG
Converting without uploading: limits and what happens to your file
Up to 20 MB per file and 8000 pixels on the longest side. Animated images are not converted here — only the still formats in the table above.
The conversion is done by your own device. Your file is opened where it already is and the new one is written on the same machine, so nothing is transmitted and there is no copy of it anywhere else. The output is built from raw pixels, which is why it carries no EXIF or GPS data and no longer says where the photo was taken.
The limit that can move is your hardware: a picture has to be unpacked into raw pixels to be re-encoded, and that takes several times the file size in memory. If a job will not fit in what the browser can spare, the panel says so before it starts.
Frequently asked questions
Which formats can I convert between?
JPEG, PNG and WebP, in any direction. The From menu narrows what the drop zone will accept, so a mismatched file is caught the moment you drop it, and the To menu decides what comes back.
Does converting change the size of the image?
The pixel dimensions stay exactly the same. The file size almost always changes, because each format stores the same picture differently — going from PNG to JPEG on a photograph often cuts the file to a tenth of what it was.
What happens to transparency?
PNG and WebP keep an alpha channel. JPEG has none, so when you convert to JPEG the transparent areas are filled with black. If the transparency matters, convert to WebP or stay on PNG.
Does converting lose quality?
Converting to PNG is lossless. Converting to JPEG or WebP re-encodes the picture at a sensible default quality, which is visually very close to the original but not bit-identical. Converting the same file back and forth repeatedly will slowly degrade it.
Can I convert an image without uploading it?
Yes — that is the only way this converter works. The decoders and encoders are loaded into the page, and your file is read, converted and saved by your own device. It is never sent to us, so there is nothing for us to keep, and the converted file carries no EXIF or GPS data because it is written from raw pixels.
What to do next
- Need exact pixel dimensions too? Resize it Resize Image
- Converted and still too big? Compress it Compress Image
- Trim the frame before converting — crop it Crop Image
- Converting an iPhone photo? Use the HEIC tool Convert HEIC
- Need a document instead of an image? Combine the photos into a PDF JPG to PDF
- Ended up with two PDFs and need one? Combine them Merge PDF
You are on the Convert Format tool.