How to resize an image without losing quality
Drop a photo in, pick a width, height, or percentage, and the resized file is ready in a couple of seconds. Nothing leaves your device — the resize happens entirely inside your browser tab, so there’s no waiting for an upload and no server ever sees your photo.
Pixels vs. percentage
By pixels is the mode to reach for when a form, a website, or a print shop asks for an exact number — “1280 px wide,” “800×600,” a profile picture that has to be under a certain size. Type a width and the height is worked out automatically so nothing looks stretched, or type both if you know exactly what you want. Turning off “keep aspect ratio” and setting both width and height forces that exact pixel size by cropping the extra area from the center, rather than distorting the picture.
By percentage is faster when you just want something smaller — cut a photo to 50% before emailing it, or shrink a batch of screenshots by 25% before pasting them into a document. There’s no upscaling here: pushing the slider past 100% wouldn’t add real detail, it would just blow up the same pixels and make the file blurrier, so this tool only shrinks.
Recommended sizes
A few numbers come up constantly:
- Website hero images: 1280–1920 px wide covers almost every screen without wasting bandwidth.
- Blog and article images: 800–1024 px wide is plenty for content that sits inside a column of text.
- Social media posts: 1080 px wide matches what Instagram, and most other platforms, display at.
- Email attachments: keeping images under 1MB (roughly 1200 px wide at normal JPEG quality) avoids “message too large” bounces.
Why no upload is required
Modern browsers can decode, resize, and re-encode images using the same Canvas API that games and photo editors rely on. This tool draws your photo onto an invisible canvas at the new size and reads the result back out as a file — the entire pipeline runs on your device’s CPU, which is also why very large files (over 20 MB) can take a moment longer on older phones.
A side effect worth knowing about: your photo’s metadata is gone
Photos from phones and cameras usually carry EXIF metadata — GPS coordinates, the camera model, the exact date and time. Canvas-based resizing doesn’t carry any of that over to the output file, since the canvas only ever holds pixel data. If you’re resizing a photo before posting it publicly, that’s one less thing to worry about — location and device details are stripped automatically, with no extra step.