Start with the real requirement
Before compressing an image, decide where it will be used. A passport-style upload form, an email attachment and a full-width website photograph do not need the same dimensions.
Dimensions usually matter more than people expect
A 4000×3000 photo contains twelve million pixels. If the final display only needs about 1200 pixels across, keeping all twelve million pixels wastes space. Reducing dimensions first often gives a cleaner result than forcing quality very low.
What the quality setting does
JPEG and WebP use lossy compression. A lower quality setting usually creates a smaller file by discarding more visual detail. The exact result depends on the image, so there is no universal percentage that is best for every picture.
A practical workflow is to resize first, export around a moderate quality level, then inspect the output. If the file is still too large, reduce quality gradually.
JPEG or WebP?
JPEG is widely compatible and remains a safe choice for photographs. WebP can produce competitive file sizes at similar visual quality in modern browsers and apps.
Keep aspect ratio unless you mean to crop
Changing only one dimension while forcing the other independently can stretch faces, circles and text. Use the Image Resizer when you need specific dimensions without distortion.
Privacy in the image compression workflow
The NexusNova image compressor performs its resize/export operation in the browser. The selected image is decoded on your device and the output is generated from a browser canvas.
A repeatable compression checklist
- Read the destination's width, height, format and file-size limits.
- Resize oversized images before aggressively reducing quality.
- Keep aspect ratio enabled unless distortion is intentional.
- Choose JPEG when broad compatibility matters.
- Try WebP when modern web delivery and smaller files are priorities.
- Open the output and inspect faces, text and fine edges before submitting it.
Why file size can vary even at the same settings
Compression is content-dependent. A smooth blue sky has less visual complexity than tree leaves, fabric patterns or text. Two images with identical dimensions and quality settings can therefore produce very different file sizes.