How it works
Upload one or more images, set the output width or height in pixels, then download a ZIP. Processing runs entirely in your browser — files are not sent to a server.
Use crop for a fixed aspect ratio (1:1, 4:5, 16:9, 9:16) before resizing. WebP usually gives smaller files than JPEG at similar visual quality.
For social posts and product photos, match the platform’s recommended pixel size to avoid blurry upscaling or heavy downscaling.
Frequently asked questions
Are my images uploaded to the internet?+
No. SmartBio resizes images locally with JavaScript in your browser. Nothing is stored on our servers.
Which format should I choose: JPEG or WebP?+
WebP is smaller for web and is supported by all modern browsers. Use JPEG if you need maximum compatibility with very old tools or strict upload rules.
Can I resize multiple images at once?+
Yes. Add several files, apply global width/height, optional per-image crop, then export everything in one ZIP.
Will enlarging a small image improve quality?+
No. Upscaling cannot add real detail. Start from the largest source file you have; use Enhance only for a mild sharpen after resize.