Resize Image
Resize images to a target width or height, keeping aspect ratio.
- Browser-only
- No upload
- No login
- No watermark
- Clear instantly
- Open-source engines
Drop files here
or use the buttons below · .jpg, .jpeg, .png, .webp
Your file stays on this device · conversion runs locally in your browser
Deep dive
What is Resize Image?
Resizing an image changes its pixel dimensions — usually to fit a specific width, height, or aspect ratio. It is the right tool when you need a photo at a specific size, not just a smaller file.
FormatSwitch resizes JPG, PNG, and WEBP images locally with the Canvas API. The aspect ratio is preserved by default, and everything runs in your browser without upload.
When to use it
- Fit a photo into a profile picture or banner size.
- Prepare product images at a specific width for an online store.
- Downscale huge camera photos for the web.
How to use it safely without uploading
Drop your images, choose By width or By height, enter the target size, and press Convert. Files download locally.
Browser-based vs server-based conversion
Most online converters upload your files to their servers, process them there, and then let you download the result. That means your file exists on someone else's computer, often in logs and backups, sometimes indefinitely. FormatSwitch is different: every conversion runs on your device using WebAssembly and the browser's built-in Canvas and PDF engines. Your file never leaves your computer, so there is nothing to leak, nothing to subpoena, and nothing to trust us on — the code that does the work is running right in your tab.
FAQ
Resize Image — questions people ask
- Are the images uploaded?
- No. Files are processed entirely in your browser using WebAssembly and the Canvas API. Nothing is uploaded to a server, and no copy is kept once you close or refresh the tab.
- Does resizing lose quality?
- Downscaling is essentially lossless. Upscaling can look blurry — start with the largest original you have.
- Is the aspect ratio preserved?
- Yes. You set width or height; the other dimension is calculated to keep the original proportions.
- Does it work on mobile?
- Yes. Every tool runs on modern iOS Safari and Android Chrome. Very large files may be slower on mobile because of tighter memory limits.
- Is there a watermark on the output?
- Never. FormatSwitch adds no watermark, logo, or quality cap to your output — the file you download is only what your browser produced.
- Are files stored anywhere?
- No. Files live only in your browser's memory (JavaScript heap). They disappear when you clear the queue, refresh, or close the tab. There is no server, no database, no log.