How to Convert Image Formats (JPG, PNG, WEBP, HEIC, AVIF) — Free
iPhone photos in HEIC that won't open on Windows, a WEBP image you need as JPG for an old upload form, a PNG you want to shrink into WEBP — here's how to convert between any of them in a few seconds, right in your browser.
Steps
- Upload your photo at Stelluna's Image Format Converter — JPG, PNG, WEBP, HEIC, AVIF, or GIF, up to 25MB.
- Pick the format you want — JPG, PNG, WEBP, or AVIF.
- Click Convert. Your photo is converted right there in your browser, in a couple of seconds.
- Download the converted file.
Ready to try it? Free, no sign-up, your photo never leaves your device.
Open Image Format ConverterConverting PNG to JPG, or JPG to PNG
These two are the most common conversions people need, and the same steps above cover both — just pick the opposite format as your target.
PNG to JPG: use this when you don't need transparency and want a smaller file — a JPG is typically much lighter than the same image as PNG, which matters for email attachments, upload limits, or page speed.
JPG to PNG: use this when you need a lossless copy to edit further, or when the destination (a logo, a design tool, a print job) requires transparency support that JPG doesn't have.
Which format should I actually use?
| Format | Best for |
|---|---|
| JPG | Photos, maximum compatibility — every website, app, and device accepts it |
| PNG | Screenshots, logos, and anything needing transparency |
| WEBP | Smaller file size than JPG/PNG at similar quality — great for web use |
| AVIF | Even smaller than WEBP, but not yet supported everywhere |
| HEIC | iPhone's default photo format — small, high quality, but not widely accepted outside Apple devices |
Most "why won't this photo upload" problems come down to HEIC — a lot of forms, older software, and non-Apple devices simply don't recognize it. Converting to JPG almost always fixes it.
FAQ
How do I convert HEIC to JPG?
Upload the HEIC file at Stelluna's Image Format Converter, choose JPG as the target format, and click Convert. Works the same way for HEIC to PNG.
How do I convert PNG to JPG?
Upload the PNG at Stelluna's Image Format Converter, choose JPG as the target format, and click Convert. Works the same way in reverse, converting JPG to PNG.
How do I convert WEBP to JPG or PNG?
Same process — upload the WEBP file, pick JPG or PNG, and download the result. Also works in reverse, converting JPG or PNG to WEBP.
Is it free?
Yes — no account, no watermark, no limit on how many images you convert.
Does my photo get uploaded anywhere?
No. The conversion happens entirely in your browser — your photo never leaves your device.
Will I lose quality converting between formats?
Converting to PNG is lossless. Converting to JPG, WEBP, or AVIF uses a high-quality setting by default, so any difference is generally not visible.