What is an image resizer with target file-size compression?
This browser-based image tool resizes pictures, changes the output format, and compresses exports for real upload limits. In manual mode you set width, height, format, and quality yourself. In target-size mode the tool searches JPEG or WebP quality within safe bounds, then downscales proportionally only when necessary. PNG exports stay lossless, so the tool explains when a strict byte target is unrealistic unless you switch formats.
How to resize an image for an upload limit
- 1Upload a browser-supported image from your device and confirm the original dimensions look correct after orientation is applied.
- 2Choose manual resize or target file-size mode, then set the output width, format, and optional custom size limit in KB.
- 3Keep aspect ratio on for typical screenshots and photos, or turn it off only when you need an exact canvas size.
- 4Generate the output, review the bytes, dimensions, target status, quality, and iteration count, then download the new file.
Common use cases
Meeting strict upload caps
Prepare profile photos, marketplace screenshots, support attachments, or government portal uploads that reject files above a fixed size.
Optimizing web and documentation images
Resize screenshots, blog illustrations, and product images so pages stay fast without sending assets to a third-party service.
Converting PNG-heavy workflows
Test whether a transparent PNG should stay lossless or convert to JPEG or WebP to reach a smaller shareable file.
Frequently asked questions
Are uploaded images sent to a server?
No. The resize, conversion, and target-size search run locally in your browser. Files stay on this device unless you choose to upload them somewhere else afterward.
Can the tool guarantee an exact target size every time?
It aims to finish at or below the selected limit, but browser image encoders are not mathematically exact. The tool uses bounded quality search and proportional downscaling to get as close as possible, then clearly reports whether the target was achieved.
Why is PNG target-size mode less predictable?
Canvas PNG output is lossless, so lowering a quality number does not meaningfully shrink the file. If PNG still exceeds the limit after resizing, use WebP or JPEG when transparency and lossless output are not required.