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Best for logos, icons, screenshots, and any image that needs transparency. Lossless quality but larger file size. Use when every pixel matters.
Best for photographs and complex images with many colors. Excellent compression but no transparency support. The standard for web photos.
Modern format that combines the best of PNG and JPG. Supports transparency, offers 25-35% better compression than JPG. All modern browsers support it.
Uncompressed bitmap format. Very large files but zero quality loss. Used in legacy Windows applications and specific industrial workflows.
| Format | Best for | Transparency | Compression |
|---|---|---|---|
| PNG | Logos, icons, screenshots | ✓ Full alpha | Lossless |
| JPEG | Photographs, social media | ✗ None | Lossy (excellent) |
| WEBP | Everything web | ✓ Full alpha | Both (best ratio) |
| BMP | Legacy software, raw data | ✗ None | None |
When you need to add the image to a design composition with layers and transparency. Note: converting lossy to lossless does not recover lost quality.
When you need smaller files and the image does not require transparency. Ideal for web uploads and email attachments. Transparent areas become white.
For web optimization. WEBP files are 25-35% smaller than equivalent JPEG and support transparency like PNG. The best all-around web format.
All conversions happen locally in your browser. Vectowl uses the HTML5 Canvas API to decode the source image and re-encode it in the target format. No data ever leaves your device, and the conversion is instant regardless of file size.
Does converting between formats lose quality? Converting from a lossy format (JPEG) to a lossless format (PNG) preserves the current quality but cannot recover data already lost during the original JPEG compression. Converting from PNG to JPEG introduces lossy compression, so quality is reduced. Converting from any format to WEBP typically produces the best balance of quality and file size. The key rule: avoid converting between lossy formats multiple times, as each conversion introduces additional quality loss.
Why do my transparent images get a black background when I convert to JPEG? JPEG does not support transparency. When transparency data is discarded, the default result is black pixels. Vectowl automatically fills transparent areas with white during JPEG and BMP conversion to prevent this common problem. If you need a different background color, add it to your image before converting.
Which format should I use for my website? For photographs and complex images, use WEBP with a JPEG fallback for older browsers. For logos, icons, and images requiring transparency, use PNG or WEBP. For hero images and banners, WEBP offers the best compression with transparency support. Serving images in WEBP format can reduce your page load time by 25-35% compared to equivalent JPEG images.
Can I batch convert hundreds of images? Vectowl supports converting up to 50 images at once directly in your browser. For larger batches, process them in groups of 50. Since everything runs locally, there are no server limits or waiting queues — processing speed depends only on your device performance.