Convert images between JPG, PNG, WEBP and BMP in your browser
An image converter changes a picture from one file format to another - turning a PNG into a JPG, a JPG into a modern WEBP, or a WEBP back into a PNG. It sounds like a simple swap, but each format stores pixels differently, so the format you pick decides the file size, whether transparency survives, and how sharp the result looks. This tool runs entirely inside your browser. The picture you drop in is decoded and re-encoded on your own device, so nothing is ever sent to a server.
The four formats and when to use each
JPG (JPEG) is the format built for photographs. It uses lossy compression, meaning it throws away detail the human eye barely notices in exchange for dramatically smaller files. A photo of a sunset or a portrait will look almost identical at a fraction of the size of a PNG. The catch is that JPG has no transparency channel and that repeated saving slowly degrades the image. Use it for photos, camera shots, and anything headed to email or a gallery.
PNG is lossless. It keeps every pixel exactly as it was and supports a full alpha channel, so transparent backgrounds stay transparent. That makes it the right choice for logos, icons, screenshots, diagrams, line art, and any graphic with sharp edges or text. The price you pay is size: a PNG photo can be several times larger than the JPG equivalent because nothing is discarded.
WEBP is Google's modern web format and it tries to give you the best of both worlds. It offers both lossy and lossless modes, supports transparency, and typically produces files noticeably smaller than a comparable JPG or PNG at similar visual quality. It is supported by every current browser, which makes it ideal for websites and apps where loading speed matters. The main reason to convert away from WEBP is compatibility with older software, some social platforms, or design tools that still expect JPG or PNG.
BMP is the old uncompressed bitmap. It stores raw pixel data with no compression at all, so the files are huge but completely faithful. You rarely need it for the web, but it still shows up in legacy Windows applications, certain hardware tools, and workflows that require an untouched pixel grid.
What actually changes when you convert
Converting is not magic, and a few things are worth knowing before you click. The most common surprise is transparency loss. JPG cannot store an alpha channel, so when you convert a transparent PNG or WEBP into JPG, the see-through areas are filled in - usually with white or black. If you need the transparency, convert to PNG or WEBP instead.
Quality behaves differently per direction. Going from a lossless source (PNG, BMP) into JPG or lossy WEBP discards some detail to save space, and that step cannot be undone. Going the other way - WEBP or JPG into PNG - is lossless, so you never add new artifacts, but you also cannot recover detail that an earlier lossy save already removed. PNG simply preserves whatever it is given.
File size is the practical reason most people convert at all. Switching a heavy PNG photo to JPG or WEBP can shrink it by 70 percent or more. Switching a tiny transparent icon to JPG, on the other hand, can make it larger and ugly because JPG is poor at flat colors and hard edges. Match the format to the content, not just the smallest number.
Why converting locally matters
Most online converters upload your file to their servers, process it there, and hand back a download link. That means your screenshots, ID scans, product mockups, or private photos sit on someone else's machine, often for hours, sometimes covered by vague retention policies. This converter never uploads anything. The work happens in your browser using the same image engine the browser already uses to display pictures, so the file stays on your device from start to finish. There is no queue, no account, and no upload bar - and it keeps working even with the network disconnected.
Practical scenarios
You shot a 12 MB PNG screenshot and need to email it - convert to JPG and it drops to a manageable size. A designer sent you product images as WEBP but your old layout tool only reads PNG - convert them and keep the transparency intact. You are building a fast website and want every JPG and PNG served as WEBP to cut load times. You exported a logo as JPG by mistake and lost the transparent background - re-export the original as PNG instead. For phone photos saved in Apple's format, our HEIC to JPG tool handles that specific case, and if your goal is purely a smaller file rather than a new format, the image compressor is the better fit. Browse the full set of image tools for more.
Frequently asked questions
Are my images uploaded anywhere?
No. The conversion runs entirely in your browser on your own device. Your image is never sent to a server, so it stays private and the tool works even offline.
Will I lose transparency converting to JPG?
Yes. JPG does not support transparency, so any transparent areas are filled with a solid color, usually white. If you need to keep transparency, convert to PNG or WEBP instead.
Which format gives the smallest file?
For photos, WEBP is usually smallest, followed by JPG, with PNG and BMP much larger. For flat graphics, logos and icons, PNG or lossless WEBP is best. BMP is uncompressed and always the largest.
Does converting WEBP to PNG reduce quality?
No. PNG is lossless, so it preserves exactly what the WEBP contained without adding new artifacts. The PNG file will be larger, but the visible quality matches the source.
Can I convert a JPG back to its original quality?
No. JPG compression discards detail permanently. Converting a JPG to PNG keeps it from getting worse, but it cannot restore detail that was already removed by earlier saves.
Why would I ever use BMP?
BMP stores raw uncompressed pixels, which some legacy Windows programs and hardware tools still require. For the web it is impractical because the files are very large, but it guarantees an untouched pixel grid.