How do I reduce file size without losing quality?

To reduce file size without losing quality, you can employ various techniques depending on whether you're working with PDF documents or image formats like JPEG, PNG, GIF, and others. Here's a concise summary of the methods found in the provided sources:

PDF Documents

1. Adobe Acrobat: Use Adobe Acrobat's online PDF compression tool to reduce the size of your PDF files while maintaining their quality.

Image Formats

For JPEG, PNG, GIF, TIFF, WEBP, and SVG images:

1. Online Services: Utilize online image compression services like Shortpixel, Image Smaller, and Fotor to compress images without noticeable loss of quality. These platforms often analyze the image and apply optimal compression rates.

   • Shortpixel: Upload your images and choose "Lossless" as the compression type to minimize visible degradation.
   • Image Smaller: Simply select the image you wish to compress and wait for the service to complete the task.
   • Fotor: Offers both manual and automatic compression features, allowing you to control the balance between file size reduction and quality.

2. Windows Photos App: On Windows, open the image in the Photos app, go to Resize, adjust the dimensions and quality levels to achieve a suitable tradeoff between file size and quality.

3. MacOS Preview App: On macOS, open the image in Preview, go to Tools > Adjust Size to resize and potentially downsample the image based on your preferences.

4. Photoshop: If you have access to Adobe Photoshop, open the image, go to File > Export As to export the image with reduced file size while controlling the quality level.

Remember that reducing file size does involve discarding some data, and although modern algorithms aim to minimize perceptible losses, they don't guarantee zero loss of detail. Always review the resulting image carefully to ensure it meets your requirements.