Image Conversion Guide
How to convert images between formats — and when each format makes sense.
What is image conversion?
Image conversion is the process of changing an image from one file format to another — for example, converting a JPG to PNG, or a HEIC to JPG. Different formats use different compression methods, so conversion can affect file size, quality, and features like transparency.
Why Convert Image Formats?
Different image formats are designed for different purposes. You might need to convert an image when:
- A website requires a specific format (e.g., WebP for better compression)
- You need transparency (convert JPG to PNG)
- An app or service doesn't support your image format (e.g., HEIC from iPhone)
- You want to reduce file size (convert PNG to WebP)
- You need to edit an image in software that only supports certain formats
Common Conversion Scenarios
HEIC to JPG
iPhones and iPads save photos as HEIC by default. Converting to JPG makes images compatible with Windows, social media, and most image editors.
Try HEIC to JPG Converter →PNG to JPG
PNG files with no transparency are often larger than necessary. Converting to JPG can reduce file size for photographs.
Try PNG to JPG Converter →JPG to WebP
WebP typically produces smaller files than JPG with similar visual quality, making it useful for web publishing.
Try JPG to WebP Converter →PNG to WebP
WebP supports both lossy and lossless compression, and can handle transparency. Converting from PNG often produces smaller files.
Try PNG to WebP Converter →Quality Considerations
Not all conversions are lossless. When you convert between formats, the result depends on the source and target formats:
- PNG to JPG: PNG is lossless; JPG uses lossy compression. Converting PNG to JPG will lose some data and transparency will be removed.
- JPG to PNG: JPG is already lossy. Converting to PNG preserves the current quality but increases file size.
- JPG to WebP: Both use lossy compression. WebP typically achieves similar quality at smaller file sizes.
- PNG to WebP: WebP supports lossless mode, which can preserve quality while reducing file size.
Transparency
Only some formats support transparency (an alpha channel). PNG and WebP support transparency. JPG does not. When you convert a transparent PNG to JPG, the transparent areas will typically become white or black.
If you need to preserve transparency, convert to PNG or WebP rather than JPG.
All Conversion Tools
Frequently Asked Questions
Does image conversion reduce quality?
It depends on the formats involved. Converting between lossless formats (like PNG to WebP lossless) preserves quality. Converting to a lossy format (like JPG) will introduce some quality loss.
What is the best format for web images?
WebP is widely supported by modern browsers and offers good compression. For photographs, JPG remains a reliable choice. For images requiring transparency, PNG or WebP are suitable.
Are my images uploaded during conversion?
No. Conversion tools on this website process images in your browser. Your files are not uploaded to any server.
Related Guides
- Image Formats Guide → — Understand each format's strengths
- JPG vs PNG → — Detailed comparison
- JPG vs WebP → — Web format comparison
- Lossy vs Lossless → — Understand compression types
Written by Image Tools Team
Published: 2026-08-15 · Updated: 2026-08-28