Overview
File extensions lie all the time: rename a .png to .jpg and you have not converted anything, just mislabelled it — and plenty of software will then refuse to open it. Real conversion means decoding the image to raw pixels and re-encoding it properly in the new format, which is exactly what this page does, in any direction between PNG, JPEG and WebP.
Drop in a file, see its true format and size reported back, pick the target format, tune quality for JPEG and WebP output, and compare the size difference before downloading. Because the whole job runs in your browser, even private images are safe to convert anywhere.
PNG vs JPEG vs WebP — which is which?
PNG is lossless: every pixel survives exactly, which makes it perfect for graphics, screenshots, logos and text — and terrible for photos, where files balloon. JPEG is lossy and photo-optimised: it discards detail eyes skip, shrinking photographs dramatically at a quality you choose. WebP is the modern all-rounder, doing both jobs — usually smaller than either at comparable quality.
The practical rule: graphics and anything with sharp edges go PNG; photographs go JPEG or WebP; WebP wins on size whenever the destination supports it (nearly everything modern does). Converting the wrong way — say, JPEG to PNG — cannot recover quality already lost; it just makes a bigger file holding the same artefacts.
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
- No more mislabelled files. Real conversion, not extension trickery.
- Smaller where it counts. WebP output typically beats both older formats.
- Decide with data. The size comparison shows the trade before you commit.
- Private. Sensitive images never cross the network.
Who can use it
Web developers modernising image assets, sellers meeting marketplace format rules, designers handing off web-ready exports, bloggers standardising uploads, and anyone whose camera saves one format while the destination demands another. Archivists converting batches to efficient modern formats will appreciate the honesty of the size reports.
How to use
- Drop an image in or click to browse; the page reports its true format and size.
- Pick the target format — PNG, JPEG or WebP.
- Set quality for JPEG/WebP output (90 is a safe default; lower for smaller files).
- Compare the converted size against the original.
- Download the converted file when the numbers suit you.
Frequently asked questions
Why not just rename the file extension?
Because the bytes inside do not change — a renamed PNG is still a PNG wearing a JPEG costume, and strict software will reject it. Worse, you lose the chance to actually shrink the file. Real conversion re-encodes the pixels; renaming re-encodes nothing.
Will converting JPEG to PNG improve quality?
No — conversion cannot recover detail that lossy compression already discarded. JPEG-to-PNG just wraps the same artefacts in a bigger lossless file. Convert toward smaller, modern formats (JPEG→WebP) for savings; convert to PNG only when you need lossless handling of graphics.
What quality setting should I use?
Start at 90: visually near-perfect for photographs, with meaningful file-size savings over the original. Drop to 75–80 for web thumbnails and listings where size matters more than pixel-peeping. Below 60, compression artefacts become plainly visible. The live size comparison on the page makes experimenting cheap, so trust your eyes.
Does conversion keep transparency?
PNG and WebP both support transparency; JPEG does not. Converting a transparent PNG to JPEG fills the transparent areas (usually white or black) and the alpha channel is gone for good — there is no way back. If transparency matters to the image, stay in PNG or WebP and never route through JPEG.
Are my images uploaded?
No. Decoding and re-encoding happen entirely in your browser using its built-in image codecs. Private or sensitive images are as safe here as in desktop software — arguably safer, since nothing is installed and nothing ever leaves the machine.
Conclusion
Convert properly or not at all: decode the pixels, re-encode them honestly in the new format, compare the sizes, then download. Three formats, every direction, zero uploads — no more mislabelled files.