ABOUT
Prepare, stretch and brighten images in your browser.
Last updated: 21 September 2026
ImageTool provides three free tools for an existing JPG or PNG: reduce its file size, change its proportions or adjust its brightness. Inspect the result before saving a new file.
What you can use today
The image compressor is available directly on the home page and on dedicated size pages. It processes one JPG or PNG at a time, with JPEG or PNG output, preset and custom maximum sizes, an optional minimum and exact pixel dimensions. The default 50KB setting means strictly below 50,000 bytes.
The image stretcher changes width and height independently, using pixels or percentages of the original. The image brightener adjusts overall brightness while keeping the original dimensions. Both editors currently have English interfaces and do not enforce a target KB limit. Open Image Stretcher or Image Brightener to use them.
More than a smaller number
The result shows the actual file size, dimensions and format. Without fixed dimensions, the JPEG tool compares a limited set of sizes and compression levels to balance detail against the byte limit. It cannot promise the best possible result for every image.
Exact dimensions take priority when you enter them. Keeping many pixels inside a small file can visibly reduce quality. Check faces, text and signatures in the full-size preview before uploading elsewhere.
Your image stays in your browser
There is no image upload step or server-side image processing. Your original is not overwritten. Public samples are synthetic images downloaded from this site. Google Analytics loads by default on the live website for visits and basic tool events, separately from image processing.
Know the boundary
ImageTool checks the settings you enter. It does not verify a destination’s current rules, certify identity photos or guarantee acceptance by a form. The compressor cannot guarantee a larger file when a minimum size is entered. Stretching can distort proportions; brightening cannot recover detail that was not captured. There is no batch processing, PDF toolkit or full photo editor.
Who maintains ImageTool
ImageTool is maintained by an independent developer using the project signature ImageTool Developer. Tool instructions and public synthetic examples are maintained alongside the site code. The examples show specific outputs, not a guarantee for every image or browser.