Different image formats suit different purposes. JPG is common for photos, PNG supports transparency, and WebP offers smaller files for websites. Sometimes you need to convert images to meet upload requirements, reduce file size or keep transparent backgrounds.
Choosing the Right Format
| — | — | — | — |
|---|---|---|---|
| JPG/JPEG | Photos | No | Small |
| PNG | Graphics, screenshots, logos | Yes | Larger |
| SVG | Logos and icons | Yes | Tiny (vector) |
Convert on Windows
Paint: open the image → File → Save as → choose JPEG, PNG or another format. The Photos app can also save copies in some formats.
Convert on Mac
Preview: open the image → File → Export → choose a format → adjust quality → Save. Preview also converts HEIC photos to JPEG.
Convert on iPhone
iPhones may save photos in HEIC. To share as JPG, adjust Settings → Camera → Formats → Most Compatible, or export via the Files app or sharing options.
Convert on Android
Many gallery apps and editors allow saving copies in different formats. Image converter apps are also available.
Using Image Editors
Professional and free image editors support exporting to many formats with quality controls, transparency options and resizing.
Using Online Converters
Online converters are quick for single images. Use reputable services and avoid uploading private photos or documents.
Converting for Websites
- Convert photos to WebP for smaller file sizes
- Keep logos as SVG or PNG
- Use WordPress image optimisation plugins to create WebP versions automatically
Quality Settings
| — | — |
|---|---|
| Web photos | 70–85% |
| Thumbnails | 60–75% |
Common Mistakes
- Converting PNG with transparency to JPG and losing the transparent background
- Saving JPG repeatedly, reducing quality each time
- Uploading HEIC files to sites that do not support them
- Using PNG for large photos
Frequently Asked Questions
What is the best format for websites?
WebP is often the best balance of quality and size.
Does converting JPG to PNG improve quality?
No. It increases file size without restoring lost detail.
How do I keep a transparent background?
Use PNG, WebP or SVG formats.
Can I convert many images at once?
Yes, using batch converters or editors with batch export.
Conclusion
Choosing and converting image formats correctly improves quality, compatibility and website speed. Use built-in tools for quick conversions, WebP for the web and PNG or SVG when transparency matters.
