Format Converter

Online Image Format Converter: JPG / PNG / WebP

This tool lets you freely switch between common formats like JPG, PNG, and WebP right in your browser, entirely locally with no uploads — so it's private and fast, with no waiting on transfers. Whether you want to shrink a photo into a more efficient WebP, turn a product image into a transparent PNG, or export a design mockup to universal JPEG, you can do it in seconds.

It's especially useful for web developers, e-commerce operators, content creators, and designers who often need to pick the best format and balance quality against file size.

What's the Real Difference Between These Formats?

JPEG (JPG): the most universal photo format. It uses lossy compression, produces small files, and has outstanding compatibility — ideal for photos, landscapes, and portraits with rich colors. Its downside is no transparency.
PNG: a lossless format that packs without destroying any pixels and supports transparency, making it perfect for logos, icons, screenshots, and anything with a transparent background. Its downside is that photos can be large.
WebP: Google's modern format, typically 25–34% smaller than an equivalent-quality JPEG while supporting transparency and animation — now the mainstream choice for web performance.
BMP: a nearly uncompressed raw bitmap with large files, used only in specific legacy cases.

The core rule for choosing: photos use JPG/WebP; anything needing transparency or lossless uses PNG/WebP.

How to Use It

1. Upload or drag an image into the dashed area (JPG / PNG / WebP / BMP, up to 50MB).
2. Choose your target format in "Target format".
3. The tool converts in browser memory and previews the result in real time.
4. Once you're happy with quality and size, click download.

Common Conversion Mistakes

① PNG to JPG drops transparency. Converting PNG to JPEG fills the transparent regions with white (or another background), so the image can look "different" without that base color.
② Don't re-encode lossily repeatedly. Every JPG save loses a bit more quality; bouncing back and forth between JPGs degrades the image. If you'll edit repeatedly, convert to a lossless format like PNG first.
③ Converting ≠ compressing. Turning into WebP usually shrinks the file, but PNG-to-PNG won't make it smaller — to cut size significantly, pair it with our Image Compressor and adjust quality.

How to Pick the Right Format

If the image is a photo or has complex colors, prefer JPG or WebP; if it has text, lines, icons, or needs transparency, prefer PNG or WebP; if you want the fastest loading with broad support, WebP is often best. You can convert to WebP here, then use Image Compressor to slim it further for both size and quality.

Six Formats Side by Side

Choosing a format really means answering three questions: do you need transparency, do you need animation, and can you accept lossy compression. The table below puts the common formats on one page.

Characteristics of common image formats

Format	Compression	Transparency	Animation	Colour depth	Typical use	Support
JPEG	Lossy (discrete cosine transform)	No	No	24-bit true colour	Photos, rich colour images	Nearly universal
PNG	Lossless	Yes (alpha channel)	No (except APNG)	Up to 48-bit	Screenshots, icons, transparency	Wide
WebP	Lossy and lossless	Yes	Yes	24-bit plus alpha	Web imagery	Modern browsers
AVIF	Lossy and lossless	Yes	Yes	Up to 12-bit per channel	High-compression web images	Newer browsers
GIF	Lossless (palette)	1-bit	Yes	Up to 256 colours	Simple animation	Wide
BMP	Little to none	No	No	24 / 32-bit	Legacy and intermediate files	Wide but bulky

Common Conversion Paths and What Happens

Transparency, file size, and reversibility do not move together. Reading the outcome in advance avoids rework.

Conversion path reference

Conversion	Transparency	Size trend	Reversible	Watch out for
PNG to JPEG	Transparent areas filled, usually white	Smaller	No	Confirm you really do not need transparency
JPEG to PNG	Cannot be created from nothing	Larger	Yes (quality does not improve)	Only convert when lossless editing is needed
PNG to WebP	Preserved	Smaller	Depends on lossy or lossless	Lossless WebP is often smaller than PNG
JPEG to WebP	Not applicable	About 25%–34% smaller	No	Watch for slight quality change
GIF to animated WebP	Preserved	Clearly smaller	No	Convert the whole animation, not single frames
JPEG to JPEG	Not applicable	Depends on quality setting	No	Repeated saves accumulate loss

Note: the 25%–34% figure for JPEG to WebP is Google published data at equivalent quality; actual results vary with image content and quality settings. AVIF usually compresses further but takes noticeably longer to encode. This tool does not export AVIF, so use a dedicated encoder when you need it.

Frequently Asked Questions

Why did the background turn white after converting PNG to JPEG? JPEG has no transparency channel, so transparent regions must be filled with a colour, white by default. Choose PNG or WebP if transparency matters.

Is converting the same as compressing? No. Moving to WebP usually shrinks the file, but PNG to PNG does not. Meaningful reduction requires a different quality setting or a higher-compression format, paired with a compression pass.

What happens if I convert between JPEGs repeatedly? Every lossy save discards a little more detail, and the loss accumulates. Convert to a lossless format first when several edits are still planned.

Is WebP always smaller? Usually, when compared lossy to lossy. Lossless WebP is not necessarily smaller than an already optimised PNG; the outcome depends on the source and the quality setting.

Related Reading

To shrink the file further after converting, see the Image Compressor; for exact pixel dimensions, use Resize; to turn an image into pasteable text, use Image to Base64. More selection guidance is in our image format converter guide.