Why image size matters so much
Images are typically 60–70% of a web page's total weight. Research consistently shows that page load time directly affects bounce rate and conversions. Cutting image size is the highest-return performance improvement available to most websites.
Choose the right format first
Format choice has a bigger impact than any quality setting. A photo saved as WebP instead of JPG at equivalent quality saves 25–35% of the file size with no visible difference. Use our JPG to WebP converter to convert individual images or batches at once.
Set an appropriate quality level
For JPG and WebP, quality 80–85 is the sweet spot for photographic content. Going higher gives minimal visual improvement but significantly larger files. Going lower starts introducing visible artifacts. Our Image Converter has a quality slider so you can find the right balance for each image.
Convert photographic PNGs to JPG or WebP
PNG uses lossless compression — excellent for logos and screenshots, but wasteful for photographs. If you have a photographic image saved as PNG, converting it to JPG or WebP with our PNG to JPG converter will typically reduce its size by 70–90%.
Try AVIF for maximum compression
AVIF provides roughly 50% smaller files than JPG at equivalent quality. It's well-supported in modern browsers as of 2026. Use our JPG to AVIF converter for the best compression available.
Resize before compressing
Serving a 4000×3000-pixel image that displays at 800×600 pixels wastes roughly 25 times the bandwidth needed. Resize images to their display dimensions before optimising them.
Frequently Asked Questions
- How much can I compress a JPEG without visible quality loss?
- At quality 80–85, most photographic JPEGs are visually indistinguishable from the original while being 40–60% smaller. Lower quality settings are appropriate for thumbnails and non-critical images.
- What is the best image format for websites in 2026?
- WebP for broad compatibility and AVIF for maximum compression. Always include a JPG fallback for any environments that might not support newer formats.
- Does compressing an image reduce its resolution?
- No — compression reduces file size by discarding imperceptible image data. The dimensions (width and height in pixels) stay the same. Resizing is a separate step that actually changes the pixel dimensions.