Image Format Converter
Convert between JPG, PNG, WebP, AVIF, BMP. Universal image format converter, browser-side.
Why convert image formats?
Different image formats have different strengths: JPG is universal and small for photos, PNG preserves transparency and sharp text, WebP is modern with the best compression, BMP is uncompressed (huge files). You need to convert between them when your source format doesn't match your destination requirements - uploading a photo to a website that doesn't accept WebP (some old platforms), saving a screenshot with transparency to PNG, creating BMP files for industrial software, or converting between formats for compatibility. This tool handles the conversion entirely browser-side using HTML5 Canvas - your images never leave your device.
How to use this tool
- Upload your image — JPG, PNG, WebP, GIF, BMP - any common format. Click or drag-drop.
- Choose target format — JPG, PNG, WebP, or BMP. Each has different trade-offs (see comparison below).
- Adjust quality (lossy formats) — JPG and WebP have a quality slider. 92% is excellent quality with good compression. PNG and BMP are lossless - quality slider is ignored.
- Download converted image — Original filename preserved with new extension. Original file is unchanged.
Format comparison
| Format | Best for | File size |
|---|---|---|
| JPG (JPEG) | Photos, complex images | Small (lossy) |
| PNG | Graphics, text, transparency | Medium (lossless) |
| WebP | Modern web - replaces JPG and PNG | Smallest (lossy or lossless) |
| BMP | Legacy/industrial use, uncompressed | Largest (uncompressed) |
Quality settings:
- 92% (default) - visually identical to original
- 80% - small file, slight quality loss visible on close inspection
- 60% - noticeably softer, smaller files
- 40% - blocky artifacts visible, very small files
Examples
- Phone photo (HEIC) → JPG: Universal compatibility, smaller than PNG
- Photoshop export (PNG) → WebP: ~25% smaller for web hosting
- Screenshot (PNG) → PNG (lossless re-encode): Sometimes shrinks PNG that wasn't optimized
- Designer mockup (PNG) → JPG: Much smaller for email or social media (if transparency not needed)
- Vintage scan (BMP) → JPG: 80% size reduction, no visible quality loss
- Game asset (PNG with transparency) → WebP: 30-50% smaller, transparency preserved
Tips & best practices
- Use JPG for photos - smallest files, excellent quality at 80-92%
- Use PNG for graphics with text or transparency - lossless preserves crispness
- Use WebP for modern web - 25% smaller than JPG, supported in all browsers since 2020
- Convert from BMP/TIFF to JPG/PNG for size reduction - those formats are very large
- If transparency is critical, PNG or WebP only - JPG and BMP don't support it
- 92% quality is the sweet spot for JPG/WebP - smaller files, no visible quality loss
- Below 60% quality, artifacts become visible to all viewers - avoid for important images
Limitations & notes
Quality slider only affects lossy formats (JPG, WebP) - PNG and BMP are lossless so the slider doesn't apply. Conversion is one-way per session - downloaded files can't be 'rolled back' to source. Browser memory limits practical use to ~100 MB images. Some specialized formats (RAW from cameras, HEIC from iPhones) aren't supported here - use specific tools (we have HEIC to JPG separately).
Frequently Asked Questions
Which format should I use for web?
WebP if you need the best compression and target only modern browsers (2020+). JPG for universal compatibility and good compression. PNG if you need transparency or sharp text. Avoid BMP - it's massive and only useful for legacy systems.
Will I lose quality converting JPG → PNG?
No - PNG is lossless. The PNG will be a perfect copy of the JPG (you can't 'recover' the data lost when JPG was originally saved). However, PNG file will be 2-3x larger than the JPG for typical photos.
Why is my PNG file so large?
PNG is lossless - it preserves every pixel exactly. For photographs, this means PNG is 2-5x larger than equivalent JPG. PNG is great for graphics, text, and transparency, but JPG is better for photos.
What's the difference between WebP lossy and lossless?
WebP supports both. Lossy mode (like JPG) sacrifices some quality for smaller files. Lossless mode (like PNG) preserves every pixel but produces slightly larger files. This tool uses lossy WebP for JPG-like behavior.
Can I batch convert multiple images?
Not currently - one image at a time. For high-volume needs, use desktop tools (XnConvert, ImageMagick batch script, IrfanView).
Will transparency be preserved?
Only if you convert TO PNG or WebP. Converting transparent PNG to JPG fills transparent areas with white (JPG doesn't support transparency). Converting to BMP also loses transparency.
What if I just want to optimize without changing format?
Use this tool with same input/output format - the re-encoding may produce a smaller file by using better compression. Or use the Image Compressor tool which is designed for that purpose.