image Image Converter (JPG, PNG, WebP) star

How to Pick the Right Format

The three formats trade off compression, transparency and compatibility differently, and picking wrong shows up as either bloated files or visible artifacts. PNG is lossless and supports a full alpha channel (transparency) — every pixel round-trips exactly, which is why it's the right choice for logos, icons and screenshots with sharp edges and text: a lossy format would smear those crisp boundaries into visible fuzz. JPEG is lossy but produces much smaller files at a given visual quality, because it discards detail the human eye is statistically less likely to notice in continuous-tone images — this trade-off makes sense specifically for photographs, where a soft compression artifact in a leaf or a cloud is far less noticeable than it would be on the hard edge of a logo, so photographs are JPEG's natural target.

WebP, introduced by Google in 2010, was built to close the gap between the two: it supports both a lossy mode (competing with JPEG) and a lossless mode (competing with PNG, including alpha transparency) in one format. At matched visual quality, WebP lossy files typically run 25-35% smaller than the equivalent JPEG — a real saving on page-load weight. The catch is compatibility: WebP is supported by every current major browser but not by all older software, legacy CMSs, or some desktop/print workflows, so a JPEG or PNG fallback is sometimes still the safer choice outside a modern web page.

Concrete example: take the same 3000×2000 photograph and export it three ways at comparable visual quality. The PNG typically comes out largest — several megabytes, because lossless compression can't meaningfully shrink natural photographic noise. The JPEG lands far smaller, often under a megabyte, because lossy compression is specifically tuned to discard the kind of fine detail a photograph is full of. The WebP comes out smaller still, roughly a quarter to a third less than the JPEG, for the same reasons the format was designed in the first place. Run the same photo through as a sharp-edged logo instead, though, and the ranking flips: PNG stays small because there's little detail to compress away, while JPEG's blur around hard edges becomes visibly obvious.

What's Worth Knowing

• Converting JPG → PNG doesn't recover quality. Compression artifacts already baked into the JPEG stay exactly as they are; PNG only stops further loss on the next edit. Convert to a lossy format only once, at the very end of your editing chain.
• A PNG made from a photo is often huge. Because PNG is lossless, it has to faithfully store every bit of JPEG noise and photographic grain, which compresses poorly — for photos, PNG is almost always the largest of the three options, the opposite of its usual reputation.
• Converting to JPEG flattens transparency. JPEG has no alpha channel, so any transparent area is filled with a solid background (white by default) before encoding — check this before converting a logo.
• Everything happens on a canvas in your browser. Files are decoded, drawn and re-encoded locally; nothing is uploaded, there's no size limit beyond your device's memory, and it keeps working offline once the page has loaded.
• Batch conversion keeps each file's own settings. Converting several images at once still applies the format decision per file, so a mixed batch of photos and logos can each land in the format that actually suits them.