JPEG is a lossy compression format, while PNG supports lossless storage. Converting JPEG to PNG is mainly used for: preventing further quality loss, preparing for subsequent editing, requiring transparent background processing, and unifying image library formats. Although conversion cannot recover lost information, it can prevent quality degradation during further editing. This tool completes the conversion locally, ensuring your image privacy and security.
Quality characteristics of JPEG to PNG conversion:
• Cannot recover information lost during JPEG compression
• Prevents secondary compression loss during further editing
• File size usually increases significantly
• Suitable as an intermediate format for editing
The main purpose of conversion is format unification and preventing further quality loss, not quality improvement.
JPEG to PNG is most suitable for:
• Images that need further editing
• Images requiring transparent backgrounds
• Unifying image library to PNG format
• Preventing quality loss from multiple edits
Not suitable for: simply "improving quality" (cannot actually improve), situations with limited storage space.
File size changes after JPEG to PNG conversion:
• Simple images: increase 2-5 times
• Complex photos: increase 3-8 times
• Highly compressed JPEGs: increase 5-10 times
• Low compressed JPEGs: increase 2-4 times
This is normal because PNG supports lossless storage, naturally resulting in larger files.
When batch processing JPEG files:
• Ensure sufficient storage space
• It is recommended to process large quantities in batches
• Monitor device memory usage
• Consider whether all conversions are truly necessary
Local processing ensures the conversion process is fast and secure, but be aware of significant file size increases.
Q: Can JPEG to PNG conversion improve image quality?
A: No. Conversion cannot recover information lost during JPEG compression, it only prevents further loss.
Q: Why is the file so large after conversion?
A: PNG supports lossless storage, the file size is normal, this is a feature of the format.
Q: When is JPEG to PNG conversion needed?
A: Mainly for further editing, adding transparent backgrounds, or format unification needs.
Q: Is the conversion process safe?
A: Completely safe, all processing is done in your browser, images never leave your device.