Overview
File formats are the dialects of the image world, and not every program speaks every dialect. A design tool exports PNG, a client insists on JPG, a publishing platform recommends WebP — and somewhere in between stands a person renaming the file extension and hoping for the best. That never works, because the data inside has to be genuinely rewritten. This converter does the rewriting properly: it decodes your picture, paints it onto a canvas, and encodes it again in the format you chose.
The whole exchange happens inside the tab you're reading, which matters more than it sounds. Conversion sites are exactly where people upload screenshots full of account numbers, half-finished designs and family photos. Here there is no upload at all, so converting a sensitive image is no riskier than converting an anonymous one — and you get an honest report of the size difference before you download.
What's the difference between PNG, JPG and WebP?
PNG is the careful archivist: it stores images losslessly, keeps text and edges razor sharp, and supports transparency — which is why logos, screenshots and diagrams live there. The price is weight; a photograph saved as PNG can be many times heavier than necessary. JPG is the universal traveller's format, understood by every device on earth. It compresses photographs brilliantly by discarding detail the eye barely misses, but it can't do transparency and it softens crisp edges.
WebP is the modern compromise, built specifically for the web. At the same visual quality it typically produces noticeably smaller files than JPG, and unlike JPG it handles transparency like PNG. Its one real weakness is reach: a handful of older programs and some desktop tools still refuse to open it. So the practical rule is simple — PNG for graphics, JPG for universal photo sharing, WebP when you control the viewing environment and want the smallest files.
Features
- Three formats, every direction. PNG, JPEG and WebP convert into each other — pick any source and any target.
- Genuine re-encoding. The image is decoded and rewritten, not just renamed — the output is a real file of the new type.
- Quality control. A quality slider (default 90) governs JPEG and WebP output so you choose the trade-off.
- Source report. The panel tells you the format and size you arrived with, so you always know the starting point.
- Size difference shown. Converted size and the exact difference appear before you download.
- One-click download. Save the converted image straight to your device.
- Fully local. No upload means private screenshots and photos are safe to convert anywhere.
Benefits
- End the extension-renaming habit. Get a real file of the target type instead of a mislabelled one.
- Please any recipient. Match whatever format the client, platform or program demands.
- See the cost first. The size comparison tells you what the conversion gains or loses.
- Private by architecture. Sensitive images never travel anywhere — conversion happens on your device.
Who can use it
Designers handing files to clients who asked for a different format. Bloggers converting PNG screenshots to lighter WebP for faster pages. Anyone submitting photos to portals that accept only JPG. Sellers standardising product images for a marketplace. Office workers turning a PNG export into something email-friendly. If you've ever stared at a file and thought 'they want this as a JPG', this page does the genuine conversion in seconds — no software to install, no upload to regret.
How to use
- Drop an image onto the page or click to choose one — its current format and size are reported.
- Select the format you want: PNG, JPEG or WebP.
- Adjust the quality slider if you're outputting JPEG or WebP (90 is a safe default).
- Check the converted size and the difference from the original.
- Download the converted image.
Frequently asked questions
Why can't I just rename the file extension?
Because the extension is only a label — the data inside stays in the old format. A PNG renamed to .jpg is still a PNG wearing a costume: strict programs will reject it, and nothing about the file actually changed. Real conversion decodes the pixels and re-encodes them according to the new format's rules. That's what this tool does, which is why the output genuinely behaves as the new type everywhere.
Which format gives the smallest file?
Usually WebP, then JPEG, then PNG — for photographs. WebP was designed for the web and typically beats JPEG by a noticeable margin at the same visual quality. But content matters: a simple screenshot with flat colours can be tiny as PNG, while a detailed photo as PNG is enormous. The page shows you the converted size before you download, so let the actual numbers decide rather than rules of thumb.
Will I lose transparency converting to JPG?
Yes — JPG has no transparency channel at all, so transparent areas become a solid colour (usually white or black depending on the encoder). If transparency matters, convert to PNG or WebP instead; both preserve it. This is the single most common conversion mistake on the internet, and it's irreversible — once the transparency is flattened into JPG, converting back won't restore it. Check before you commit.
What quality setting should I use?
90 is a sensible default that keeps quality essentially indistinguishable from the source while still trimming weight. Drop to 80 for web images where loading speed matters, or raise toward 95 for archival copies where every nuance counts. Below 70, most viewers will start noticing softness. Remember the slider only affects JPEG and WebP output — PNG is lossless, so quality doesn't apply to it.
Does converting twice damage the image?
It can, if a lossy format is in the chain. Every JPEG or WebP encoding discards a little more detail, so converting JPG to PNG to JPG quietly accumulates damage even though the middle step was lossless. Convert once, from the best original you have, directly to your final format. If you need several formats, make each one from the original — never chain conversions.
Are my images uploaded anywhere?
No. Decoding and re-encoding happen in your browser using its built-in image engine. The file never leaves the tab, nothing is stored on a server, and the page keeps working offline once loaded. Conversion sites are where people historically uploaded their most sensitive screenshots — here, that entire category of risk simply doesn't exist.
Conclusion
Format mismatches are a five-minute annoyance that shouldn't need installed software. Drop the image, pick the target format, glance at the size difference, download. Properly re-encoded, honestly reported, and private throughout — the extension-renaming days are over.