Compare one image at three quality levels and pick the best balance of size and appearance.
Try an example
Load a ready-made sample into this tool and run it. Every result you see is calculated live by the tool itself — nothing here is a pre-written answer.
Sample: File: sample-photo.jpg
How to Use
- Choose an image (up to 10 MB).
- Click Run Qualities.
- Preview the sizes and download the quality you prefer.
See the image quality vs file size comparison before you choose
Instead of guessing a setting, this tool renders one image at three quality levels and shows the actual file size of each version, so the image quality vs file size comparison is based on measured results from your own picture. Preview the versions, pick the balance of size and appearance you prefer, and download that quality. No setting is applied until you download a version.
For decisions a slider alone makes awkward
A single compressor asks you to commit to one number; this comparison suits the moments when the right number depends on the image, such as a hero photo where banding would show, or a thumbnail where heavy compression is invisible. Seeing three outcomes side by side makes the cost of each step plain before anything is final.
Good to know
The sizes shown are measured from the actual encoded files, not estimated from the quality number, so two different images at the same setting can show quite different savings. Only three fixed levels are compared; if none fits, a slider-based compressor gives finer control.
Frequently asked questions
How is this different from a normal compressor?
A normal compressor applies the single quality setting you choose. This tool produces three versions at different quality levels in one run and reports each real file size, so you choose after seeing the outcomes.
Which quality level should I pick?
Pick the lowest level whose preview still looks clean at the size the image will actually be shown. Small display sizes hide compression well; large or detailed images usually deserve the middle or highest level.
Are my images uploaded to a server?
No. The three versions are encoded in your browser, and files are never sent to the site's server. Your original stays untouched on your device, and only the version you select is downloaded.
How to use Image Quality Optimizer
- Choose an image (up to 10 MB).
- Click Run Qualities.
- Preview the sizes and download the quality you prefer.
Limitations
Sizes shown are measured from the actual encoded files, not estimates. Files are processed in your browser and never sent to the site's server.