What Image Formats and File Size Limits Does ImageSmaller Support?
ImageSmaller accepts PNG, JPG/JPEG, GIF, TIFF, WEBP, SVG, and AVIF files for compression, with a maximum upload size of 50 MB per image. It also converts images to WEBP, AVIF, PNG, or JPG, adds no watermark, and requires no registration. If your file is under 50 MB and in one of those formats, you can compress it directly in the browser.
Supported formats
The tool splits its work into two groups:
Compression — reduce the file size of an existing image:
- PNG
- JPG / JPEG
- GIF
- TIFF
- WEBP
- SVG
- AVIF
Conversion — change the file format:
- Convert to WEBP
- Convert to AVIF
- Convert to PNG
- Convert to JPG
If your goal is simply a smaller file, use the compression path. If you need a specific format for a platform or CMS, use the conversion path — though note that converting and compressing are separate actions, so pick the one that matches your end goal.
File size limit
The stated cap is 50 MB per image. Anything larger will not be accepted, so you would need to resize or split the file first.
There is no stated limit on how many images you can process, and no registration is required to use the service.
What you get back
- No watermark — the tool explicitly does not stamp optimized images.
- Lossless compression — the site describes its compression as reducing file size "without losing visual quality," using what it calls the best compression options.
- Automatic cleanup — uploaded files are removed automatically after a few hours.
- Encrypted connection — uploads go over a secure connection.
How to compress an image
- Open the ImageSmaller compressor page.
- Select the image you want to compress (max 50 MB).
- Wait a few seconds while it processes on the server.
- Download the optimized result.
No software installation is needed — processing happens in the browser on the service's servers.
When this tool fits your needs
| Your situation | Does ImageSmaller fit? |
|---|---|
| File is under 50 MB and in a supported format | Yes |
| You want a smaller image for web page speed or SEO | Yes |
| You need WEBP, AVIF, PNG, or JPG output | Yes, via conversion |
| You don't want a watermark on the result | Yes |
| You want to avoid creating an account | Yes |
| Your file exceeds 50 MB | No — resize first |
| You need a format outside the listed set | No |
The site frames compression as a way to improve page load speed and SEO score, which is the main practical reason to use it for web images.
Points to keep in mind
- "Lossless" is the site's own claim. It states compression happens without losing visual quality, but you should verify the result on your own image before publishing, especially for graphics with fine detail or text.
- Files are deleted after a few hours, not instantly — so avoid uploading anything you would not want temporarily stored on a third-party server.
- Compression and conversion are distinct. Choosing "Convert to WEBP" is not the same as compressing a WEBP; check which action you actually need.
- The 50 MB limit is per image, so large TIFFs or high-resolution PNGs may need downsizing before upload.