Overview
File extensions are just labels; the format is the actual encoding inside. Renaming photo.png to photo.jpg changes the label and leaves the PNG encoding untouched — most software then chokes or misbehaves. Real conversion means decoding the pixels and writing them fresh in the target format's encoding, which is exactly what this tool does.
All three conversions run both ways between PNG, JPEG and WebP. A quality slider governs the lossy outputs so you choose the size-versus-fidelity trade-off, and the panel reports the source format, the converted size and the exact difference before you download. Nothing uploads; a screenshot of your bank statement is as safe here as a sunset.
How are PNG, JPEG and WebP different?
PNG is lossless: every pixel survives exactly, which is perfect for graphics, text and transparency — but photos stay heavy. JPEG is lossy and perceptual: it discards detail your eyes mostly ignore, making it ideal for photographs at a fraction of the size — but it cannot do transparency, and sharp graphics get artefacts.
WebP is the modern middle path: lossy like JPEG but more efficient, plus lossless and transparency support like PNG. It now works nearly everywhere, which is why it is usually the best choice for the web. The converter lets you move between all three so each image can live in the format that suits it.
Features
- Three formats, every direction — PNG, JPEG and WebP convert into each other freely.
- Genuine re-encoding: decoded and rewritten, not renamed — the output is a real file of the new format.
- Quality slider (default 90) for JPEG and WebP output — you choose the trade-off.
- Source report: format and size you arrived with, so the starting point is always clear.
- Size difference shown — converted size and exact saving before you download.
- One-click download straight to your device.
- Fully local: no upload means private images are safe to convert anywhere.
Benefits
- Actually converts. Real re-encoding, not a renamed file that breaks later.
- Pick the right format. Move each image to the encoding that suits it best.
- See the saving. Exact size difference shown before you commit.
- Total privacy. Conversion never leaves your browser.
Who can use it
Bloggers converting screenshots to lighter WebP. Sellers standardising product photos to JPEG. Developers modernising asset folders. Anyone who received a BMP or TIFF-era file and needs something the web understands. Archivists keeping PNG masters while publishing WebP copies — convert, don't replace.
How to use
- Drop your image onto the page or click to browse.
- Pick the target format: PNG, JPEG or WebP.
- Adjust the quality slider for JPEG/WebP output (90 is a safe default).
- Compare the converted size against the original in the panel.
- Download the converted file when you are happy with the trade-off.
Frequently asked questions
Why can't I just rename the file extension?
Because the extension is a label, not the content. A PNG renamed to .jpg is still PNG-encoded inside, so software expecting JPEG data will fail or misbehave. Real conversion decodes the pixels and re-encodes them — which is what this tool does.
Which format gives the smallest file?
Usually WebP — it beats JPEG by a clear margin at equal quality and handles transparency too. JPEG is second for photos. PNG is the largest for photos but the right choice for graphics and anything needing transparency with maximum compatibility.
Will I lose transparency converting to JPEG?
Yes — JPEG has no transparency channel, so transparent areas become a solid colour (usually white or black). If transparency matters, convert to WebP or PNG instead; both preserve it.
What quality setting should I use?
90 is a safe default — near-indistinguishable from the original with good savings. Drop to 75–80 when size matters more, like thumbnails. Below 60, artefacts become visible; reserve that for drafts and previews.
Does converting twice damage the image?
Each lossy conversion (to JPEG or lossy WebP) discards a little more detail, so repeated round-trips degrade gradually. Convert once from the best original you have. PNG-to-PNG is lossless and can repeat forever without harm.
Are my images uploaded anywhere?
No. Decoding and re-encoding happen in your browser's image engine, on your device. There is no upload step — the page works even offline once loaded.
Conclusion
Formats are tools, not identities — put each image in the encoding that serves it best. Convert genuinely, compare the sizes, keep your masters, and never trust a renamed file again.