Convert PNG, JPG, WebP, HEIC, GIF, BMP and more — instantly. Single or bulk conversion. Download as ZIP. 100% free, no limits, no watermarks.
Choosing the right image format makes a real difference to quality, file size, and compatibility. Here's a complete guide to every supported format — what it's best for and when to convert to it.
| Format | Type | Best For | Not Ideal For |
|---|---|---|---|
| JPG / JPEG | Lossy | Photographs, social media images, email attachments. Excellent compression with minimal visible quality loss. Universal compatibility — opens on every device and app. | Images with transparent backgrounds, logos, text-heavy graphics, anything that needs perfect quality. |
| PNG | Lossless | Logos, graphics, screenshots, images with transparent backgrounds. Perfect quality preservation. Ideal for web graphics where transparency is needed. | Photographs (produces very large file sizes). Not recommended where file size matters. |
| WebP | ModernWeb | Website images in 2026. Google's format produces files 25–35% smaller than JPG at the same quality, and supports transparency like PNG. Recommended by Google for page speed and SEO. | Email attachments and situations requiring universal compatibility — some older apps still don't support WebP. |
| GIF | Lossy | Simple animated images, memes, icons with very limited colours (max 256 colours). Widely supported for animations. | Photographs or complex images — the 256 colour limit produces poor quality. Use MP4 for longer animations. |
| BMP | Lossless | Windows system graphics, simple image storage where no compression is needed. Very high quality. | Web use or sharing — produces enormous file sizes. Rarely used in modern workflows. |
| Sharing images as documents, printing, professional presentation. Converts each image into a single-page PDF. Universal document format for professional use. | Web display or situations where the image needs to be edited or resized after sharing. |
Here are the most common reasons people convert images, and which format to choose for each situation.
Most online image converters — including Convertio, CloudConvert, and Smallpdf — upload your images to their servers for processing. This means your photos, business documents, and private images travel across the internet to a third-party server you don't control.
ToolsNook's image converter is fundamentally different. Every conversion happens entirely inside your browser using JavaScript and the HTML5 Canvas API. Your images are processed locally on your own device.
Browser-based conversion is particularly important when converting personal photographs, business documents containing sensitive information, client files, medical images, or any private content you wouldn't want stored on a third-party server. Since nothing leaves your device, there is zero privacy risk.
1. Click "Choose Files" or drag and drop your image onto the converter above.
2. Select your output format from the dropdown (JPG, PNG, WebP, PDF, etc.).
3. Adjust quality if needed — 92 is the default for JPG and WebP, balancing quality and file size.
4. Click "Convert Images".
5. Click "Download" next to your converted image.
1. Select multiple files at once by holding Ctrl (Windows) or Cmd (Mac) when choosing files, or drag multiple files into the drop zone.
2. All images will be converted to the same output format. Select your desired output format and quality.
3. Click "Convert Images" to convert all files simultaneously.
4. Download individual files or click "Download All as ZIP" to get all converted images in a single ZIP file — perfect for bulk product photos or batch processing.
For photographs: Use JPG at quality 85–95 for the best balance of quality and file size. Quality above 95 produces minimal visual improvement but significantly larger files.
For web images: Use WebP for the smallest file size while maintaining quality. Supported by all modern browsers since 2020.
For logos and graphics: Use PNG to preserve sharpness and transparency. Avoid converting logos to JPG — the lossy compression blurs sharp edges and text.
For HEIC from iPhone: iPhone and iPad photos in HEIC format convert cleanly to JPG. Use quality 90+ to preserve the original detail of iPhone camera shots.