Will resizing degrade quality?

Downscaling is generally clean — the canvas resampling averages neighboring pixels and results look sharp. Upscaling adds pixels that weren't in the original, so it always looks softer; there is no way to recover detail that was never captured.

What format does the output use?

The same format as the input wherever possible. JPG stays JPG, PNG stays PNG. The exception is formats your browser can decode but not re-encode: AVIF output isn't supported by any browser's canvas encoder, and some Safari versions can't encode WebP. In those cases the tool falls back to PNG, and the downloaded file gets a .png extension so the name always matches the real format.

Is transparency preserved?

Yes — a transparent PNG resized through the tool keeps its alpha channel, because the output stays PNG.

Can I resize several images at once?

Yes, up to 10 per batch. Every image is resized to the same target dimensions, which is ideal for thumbnails. If your images have different aspect ratios and you want each scaled proportionally, run them in separate batches.

Resize Image

Resize images to exact dimensions.

Drop image files here or browse

Max 50MB per file · Up to 10 files

About Resize Image

Resizing an image is the most common image-editing task on the web. You need a 1200x628 banner for social media, a 600px-wide hero image, or product thumbnails at exactly the dimensions your template expects. Convertora's resize tool takes JPG, PNG, WebP, and AVIF images and scales them to any pixel dimensions you type in, with an aspect-ratio lock that recalculates the other dimension automatically so nothing gets stretched.

The whole operation runs inside your browser. The image is decoded into a canvas, redrawn at the new size, and re-encoded — your photo never leaves your device, which matters when you're resizing ID scans, medical images, or anything else you'd rather not upload to a stranger's server. It also means there's no queue and no per-file wait: a batch of ten images finishes in a few seconds.

How to use it

1Drop up to 10 images into the upload area (50 MB per file). The original dimensions of the first image are read and shown.
2Type the target width or height in pixels. With 'Lock aspect ratio' checked (the default), the other dimension updates automatically to keep the original proportions.
3Uncheck the lock if you need exact, independent width and height — for example a strict 1200x628 social card. Be aware this can stretch or squash the picture.
4Click Resize. Each image in the batch is scaled to the same target dimensions and downloaded, with the new size in the filename (e.g. photo-800x600.jpg).

Common use cases

Scaling photos down to the exact display size of a website slot, so the browser doesn't waste bandwidth downloading pixels it will never show.
Producing a uniform set of thumbnails from a folder of differently-shot product photos.
Meeting upload requirements for marketplaces, job portals, and CMSs that demand specific pixel dimensions.
Shrinking a phone photo (often 4000+ pixels wide) to something email-friendly before attaching it.

Frequently asked questions

Tips

Resize first, then run the result through the Compress Image tool — shrinking dimensions plus re-encoding gives far smaller files than either step alone.
If you need a different output format (say, WebP for the web), resize first and then use the Convert tool to change formats.
To trim away part of the picture rather than scale the whole thing, use the Crop Image tool instead — resizing always keeps the full frame.

100% private — runs in your browser

Convertora processes everything on your device using JavaScript and WebAssembly. Files never leave your browser, are never uploaded to a server, and are never seen by us or anyone else. The moment you close the tab, the data is gone — there is no temporary cloud copy, no log entry, no retained backup.

Because the work happens locally, processing speed depends on your device — but there are no rate limits, no daily caps, and no file size restrictions beyond what your browser can handle in memory. No signup, no account, no payment. The tool works the same in incognito mode, on a corporate network, or after the page has loaded once, even with the network disconnected.