Image Converter — PNG, JPG, JPEG & WebP
Convert images into the format your project needs without sending the originals to a third-party server.
- Use JPEG or WebP for photographs.
- Use PNG when you need sharp UI edges or transparency.
- Re-check file size after conversion — format choice often matters more than a tiny quality tweak.
Supports PNG, JPG, JPEG, and WebP. Processing happens entirely in your browser, so your image files are never uploaded or stored.
Pick a format for the job
Photographs usually shrink best as JPEG or WebP. UI screenshots and graphics with hard edges or transparency often belong as PNG. Converting first, then resizing and compressing, keeps the workflow predictable.
Always keep the original. Conversion can be lossy depending on the target format, and you may want the source asset again later.
What each format is actually for
JPEG is lossy, has no alpha channel, and remains the most compatible choice for photographs. PNG is lossless with full transparency, which suits UI edges, logos and screenshots, at the cost of size on photo-like content. WebP does both — lossy and lossless modes plus transparency — with broad browser support today. AVIF compresses better still, but slower encodes and weaker support in older clients make it a deliberate choice rather than a default.
So the question is rarely 'which format is best' and almost always two others: does this asset need transparency, and does it look like a photograph? Those two answers pick the format for you.
Where transparency quietly breaks
Converting a transparent PNG to JPEG replaces transparency with a colour — often black, sometimes white, depending on the encoder — because JPEG cannot store an alpha channel. If a transparent asset has to become JPEG, flatten it onto the background colour it will actually sit on first, or convert to WebP and keep the transparency instead.
A decode-and-re-encode round trip also drops ancillary data: ICC colour profiles, EXIF orientation, and editor metadata do not survive a canvas conversion. If a photo depends on its colour profile or its orientation flag, check the result rather than assuming it came through.
The conversion that makes the file bigger
Changing format is not automatically a size win. Converting a photograph from JPEG to PNG usually inflates it several times over, because PNG is lossless and must store every pixel exactly where JPEG had already thrown detail away. The same happens converting any lossy file into a lossless one. The reverse — PNG to JPEG — shrinks a photo and can visibly damage a screenshot or a graphic with text.
Rule of thumb: photographs go to JPEG or WebP, screenshots and flat graphics go to PNG. If a conversion grew the file, you probably moved a photograph into a lossless format or a screenshot into a lossy one.
When not to convert
There are two cases where the right move is to leave the file alone. If the destination already accepts the format you have, converting only risks quality and metadata for no gain. And if the file is already lossy and you merely want a different extension, re-encoding re-compresses it — often a rename or a server-side content-type change is what was actually needed, not a new encode.
Convert once, from the original, into the format the destination requires, and keep the source. Chained conversions (PNG to JPEG to WebP) stack their losses.
Frequently asked questions
When should I use WebP?
Use WebP when your audience’s browsers support it and you want smaller photo-like assets. Keep a fallback strategy if you still need to support very old clients.
Does conversion upload my files?
No. Conversion runs in your browser on your device.
Why did my file get bigger when I converted it?
You likely moved a photograph from a lossy format (JPEG, WebP) into PNG, which is lossless and stores every pixel. Use PNG for sharp graphics and transparency, and keep photos as JPEG or WebP.
Does converting a JPEG to PNG improve quality?
No. Converting cannot recover detail JPEG already discarded — it only stores the current pixels in a larger, lossless container. Quality never improves on conversion; start from a better original instead.