Set a new width and height in pixels. Nothing is uploaded — resizing runs in your browser.
Aspect ratio locked — the other side follows automatically.
Download your resized files here.
Every resize is done by your own browser. Your images are never sent to us, so there is nothing for us to store.
The aspect ratio is locked by default and read from your first image, so typing one side fills in the other.
Resize a whole batch to the same dimensions and download the results together as a ZIP.
Drag it onto the drop zone, browse for it, or paste it from the clipboard. Up to 20 MB per file.
Type the width in pixels. With the lock on, the height is worked out for you from the original proportions.
Save the result, or take the whole batch as a single ZIP. New dimensions are added to the file name.
The aspect ratio is the relationship between an image’s width and its height. Keeping it locked while you resize is what stops the picture from being stretched or squashed: a 1920 × 1080 image is 16:9, and 1280 × 720 is the same 16:9, which is why it still looks right. Convetta reads the ratio from the first image you add and keeps it locked unless you turn the lock off.
| Original | Resized to | Aspect ratio | Typical use |
|---|---|---|---|
| 1920 × 1080 | 1280 × 720 | 16:9 | Widescreen photos and video stills |
| 1200 × 1200 | 600 × 600 | 1:1 | Square profile and product images |
| 1080 × 1350 | 720 × 900 | 4:5 | Portrait social posts |
| 3000 × 2000 | 1500 × 1000 | 3:2 | Photos straight from a camera |
Dimensions describe how many pixels wide and tall an image is. A 1920 × 1080 image is 1920 pixels across and 1080 pixels down. Changing the dimensions changes how much detail the image contains — it does not change the file format, and it is not the same thing as compressing the file.
Resizing changes the pixel dimensions. Converting changes the file format, for example PNG to JPG or JPG to WEBP. Convetta keeps the format when it resizes: a JPG stays a JPG and a WEBP stays a WEBP. Anything else is saved as PNG so that no quality is thrown away in the process.
Compression shrinks the file size in KB or MB while leaving the width and height alone. Resizing shrinks the width and height, which usually reduces the file size as a side effect. If an image is too big in pixels, resize it. If the dimensions are right but the file is still heavy, that is a compression problem.
No. Resizing is done entirely by your own browser with the Canvas API, so the image never leaves your device. There is no upload step at all, which is also why resizing keeps working on a poor connection.
Making an image smaller usually looks fine, because you are asking for fewer pixels than the original has — Convetta uses high-quality smoothing when scaling down. Making an image larger than its original size is a different matter: resizing cannot invent detail that was never captured, so an enlarged image tends to look soft.
Leave the aspect ratio lock on, which is how Convetta starts. Type the width you want and the height is calculated from the original proportions. Turn the lock off only when you deliberately want dimensions that do not match the original shape.
Yes. Every selected image is resized to the same width and height in one pass, and you can download the results individually or as a single ZIP. The aspect ratio lock follows the first image you added, so a mixed batch is best resized with the lock off.
JPG, PNG, WEBP, GIF, BMP and AVIF, up to 20 MB each. JPG and WEBP files come back in the same format; everything else is returned as PNG.
Yes. Width and height are entered in pixels and any whole number from 1 to 10000 is accepted. Turn the lock off first if the exact size you need has different proportions from the original.
Resizing changes the pixel dimensions, such as 1920 × 1080 down to 1280 × 720. Compressing reduces the file size in KB or MB while keeping those dimensions. Resizing an image smaller normally reduces the file size too, but it is not the same operation.