Image Resizer & Compressor

What this tool does

Resize an image to exact pixel dimensions or a percentage, re-encode it as JPEG, WEBP, or PNG at whatever quality you choose, and see the before/after file size side by side before downloading. Everything runs on Canvas inside your browser tab — the file never gets uploaded to a server, which also means there's no waiting on an upload/download round trip.

How to use it

• Upload an image. You'll immediately see its original dimensions and file size.
• Set a new width or height (aspect ratio locks automatically so it doesn't distort), or just type a percentage to scale proportionally.
• Pick an output format — JPEG or WEBP for photos where some quality loss is fine in exchange for a much smaller file, PNG if you need transparency or lossless output — and drag the quality slider for JPEG/WEBP.
• Click Resize & Compress, compare the original and result side by side with their exact file sizes, then download.

Real-world use cases

Shrinking a phone photo down from several megabytes before attaching it to an email or uploading it to a site with a size limit. Batch-prepping product photos or blog images to a consistent width without installing photo editing software. Converting a PNG screenshot to WEBP or a compressed JPEG to cut page weight on a website.

Frequently asked questions

Does resizing an image reduce its file size on its own?

Usually, yes — fewer pixels means less data. But the format and quality setting matter just as much: a large PNG converted to a compressed JPEG or WEBP at the same dimensions often shrinks far more than resizing alone would.

Which format should I pick — JPEG, WEBP, or PNG?

WEBP typically gives the smallest file size at a given quality and is supported by all modern browsers, so it's the best default for web use. JPEG is the safest universal choice if you need maximum compatibility. PNG is lossless and supports transparency, but produces much larger files for photos — use it for screenshots, logos, or images that need a transparent background.

Will resizing up (making an image larger) improve its quality?

No — scaling above 100% stretches existing pixels rather than adding real detail, so it can look softer or blurrier. This tool allows it (up to 500%) since it's occasionally useful for placeholder purposes, but it's not a substitute for a higher-resolution source image.

Is there a limit to how large a file I can process?

It depends on your device's memory since everything happens client-side, but typical photo sizes (up to several dozen megapixels) process without issue in a modern browser.

Does this tool see or store my images?

No. Nothing is uploaded — the resize and compression happen entirely on your own device using the Canvas API, and the image is discarded as soon as you close or reload the page.