What is an Image Converter & Resizer?
An image converter is a browser-based utility that changes the file format of your pictures (such as turning a PNG into a JPG or WebP). A resizer scales the physical dimensions (width and height) of an image, which also helps reduce file size. Our tool combines both functions, allowing you to optimize images for websites, emails, or social media instantly without uploading them to a cloud server.
How to Convert and Resize Images
- Upload your image — drag and drop a JPG, PNG, WebP, or GIF into the dropzone.
- Select output format — choose whether you want the final image to be JPG, PNG, or WebP.
- Adjust quality — (For lossy formats like JPG/WebP) lower the quality slider to reduce the final file size.
- Resize (Optional) — choose "By Percentage" to scale the image up or down proportionally, or "By Dimensions" to enter a specific pixel width/height.
- Convert & Download — click "Convert Image" and then save the newly formatted file directly to your device.
Examples / Use Cases
Use Case 1: Web Optimization (WebP Conversion)
Upload a large, heavy PNG photograph. Select "WebP" as the format and lower the quality to 80%. This will drastically reduce the file size, making your website load much faster without noticeably degrading the visual quality.
Use Case 2: Standardizing Social Media Assets
Upload a massive digital camera photo. Select "By Dimensions" and set the width to 1080px (the standard width for Instagram). Set the format to JPG and convert. You now have a perfectly sized image ready for posting.
Advantages and Limitations
- Advantages: All processing is done locally in your browser via the HTML5 Canvas API. This means zero upload times, no file size limits imposed by a server, and 100% data privacy.
- Limitations: Web browser Canvas APIs do not support EXIF data preservation. If your original photo has metadata (like camera settings or GPS coordinates), that data will be stripped during the conversion process.
Privacy & Security
Privacy is paramount. Unlike other converters that upload your photos to a remote server for processing, ToolShelf uses your browser's native capabilities. Your personal photos, screenshots, and designs never leave your device. The file never touches our servers.
Frequently Asked Questions
What image formats are supported? ▼
You can input JPG/JPEG, PNG, WebP, and GIF. You can export the converted file as JPG, PNG, or WebP.
Does resizing an image reduce its file size? ▼
Yes, significantly. Scaling down an image's pixel dimensions is one of the most effective ways to lower the file size in megabytes.
Is my image uploaded to the internet? ▼
No. The conversion happens entirely within your web browser. We do not store, track, or upload your photos.