PNG files can be huge for photos. Converting to JPG typically shrinks them by 70–90% — perfect for email and websites.
How to use the PNG to JPG converter
- Add your PNG filesClick “Choose Files” or drag and drop them into the box. You can add many files at once — or paste a file with Ctrl+V.
- Choose JPG and adjust settingsJPG is selected automatically. Optionally open Settings to change quality, size or background.
- Convert and downloadPress “Convert”. Your JPG files appear instantly — download them one by one or all together as a ZIP.
PNG vs JPG
PNG Portable Network Graphics
PNG stores raster images with lossless compression, so every pixel is kept exactly. It handles full alpha transparency, which makes it the standard choice for logos, icons, UI screenshots and graphics with sharp edges or text.
- Compression
- Lossless
- Features
- Supports transparency
- Origin
- 1996, W3C
- Best for
- Logos, screenshots, web graphics with transparency
JPG Joint Photographic Experts Group (JPEG)
JPG is the most widely supported photo format. It uses lossy compression that discards detail the eye barely notices, producing small files that open on every device, browser and app — ideal for photographs, less so for text or line art.
- Compression
- Lossy
- Features
- No transparency
- Origin
- 1992, JPEG committee
- Best for
- Photos, social media, email attachments
Why use ConvertMathly?
Files are processed on your device and never uploaded. Close the tab and they are gone.
No account, no daily cap, no queue and no watermark — convert as much as you want.
No waiting for uploads or downloads: results are ready as fast as your device can process them.
Windows, Mac, Linux, Chromebook, iPhone and Android — any modern browser, nothing to install.
Frequently asked questions
How do I convert PNG to JPG?
Add your PNG files above, make sure JPG is selected and press Convert. The JPG files are ready to download a few seconds later — no installation or account required.
Will converting PNG to JPG reduce quality?
JPG uses lossy compression, but at the default 90% quality the difference is practically invisible. Raise the quality slider to 100% for maximum fidelity or lower it for smaller files.
What happens to transparent areas?
JPG does not support transparency, so transparent pixels are filled with a background color — white by default. You can choose any color in Settings.
Is there a file size or daily limit?
No. Since everything runs locally, there are no daily caps, queues or file size limits beyond what your device can handle.
Are my PNG files uploaded to a server?
No. ConvertMathly converts files entirely inside your web browser using JavaScript and WebAssembly. Your files never leave your computer or phone, which makes it safe for private photos and documents.
Can I convert multiple PNG files at once?
Yes — add as many files as you like. They are converted one after another and you can download everything in a single ZIP.