In the operation of small and medium-sized enterprise (SME) websites, image size is a detail that is often overlooked but has a significant impact. If images are too large, page loading slows down, and visitors may lose patience; if images are too small, they appear blurry and unprofessional. This article provides a practical set of methods for selecting and optimizing image sizes based on common usage scenarios, helping you strike a balance between clarity and performance.
First, Determine Where Images Will Be Used
Different positions on a website have varying requirements for image size and clarity. Before deciding on dimensions, outline the main purposes of images on your site:
- Carousel or large banners: Typically located at the top of the homepage, these require high width and clarity. A recommended width is around 1920 pixels, with height depending on design, commonly 400-600 pixels.
- Product or case study images: Used to showcase product details or case results, a width of 800-1000 pixels is recommended, with height adjusted proportionally to ensure clarity after scaling.
- In-article images: To enrich content, a width of 600-800 pixels is sufficient; larger images can slow down the loading of reading pages.
- Thumbnails or list images: For article lists, product lists, etc., a width of 200-300 pixels is suitable, and file size should be as small as possible since there are many of them.
In the website backend or code, you can typically set the display size of images, but the actual file dimensions (pixel size and file size) are what affect loading speed. It is recommended to prepare image files at twice the display size to accommodate high-definition screens, but avoid unnecessary oversizing.
Image Compression Is a Necessary Step
Many businesses directly export images from cameras or design software, resulting in file sizes of several megabytes. Uploading these directly can cause slow page loading. Compressing images can significantly reduce file size while maintaining acceptable clarity to the naked eye.
There are two common methods:
- Use image processing tools: Such as Photoshop or online compression tools. When exporting, choose JPEG format and set quality parameters between 70%-80%, which typically reduces file size by over 70%.
- Use the backend compression feature: Some website builders have built-in image compression that automatically optimizes on upload. However, it is advisable to manually compress images before uploading for the best results.
To determine if compression is excessive: zoom the image to 100% and check. If there are noticeable artifacts or blurriness, the compression is too aggressive, and you need to adjust the parameters.
Establish Unified Image Standards
For long-term maintenance ease, it is recommended to create a simple set of image standards, including file naming, size specifications, and storage locations. For example:
- File naming: Use English or pinyin, including the date and content keywords, such as "20250115-product-red-chair.jpg", for easy retrieval.
- Size specifications: Document common sizes, such as carousel 1920×600, product 800×800, thumbnail 300×300.
- Storage location: In the website backend or server, create folders by category or date to avoid cluttering all images together.
With unified standards, even if the person in charge changes, the new person can quickly take over, reducing communication costs.
Inspection and Adjustment
After uploading images, it is recommended to perform the following checks:
- Open the page and observe whether images are clear and not stretched or distorted.
- Use the browser's developer tools (press F12) to check image loading time. If a single image exceeds 200KB, consider further compression.
- Preview on mobile devices to ensure images are responsive and no horizontal scroll bars appear.
If you find that some images are not the right size, replace them promptly and note the reason to avoid repeating the mistake.
Optimizing image sizes is not a one-time task but part of daily website maintenance. Every time you upload new images, follow this process. Over time, your website's loading speed and user experience will improve.
