01
Phone photo on Auto at 80%
Upload a 3.89 MB, 4032×3024 JPEG straight from a camera with format on Auto and quality at 80, and it comes back as a 1.46 MB WebP — about 62% smaller, at exactly the same dimensions.
Image Compressor
Image ToolsCompress images online to reduce file size with adjustable quality — free image compressor.
Image
80% is visually near-identical to the original for most photos. Transparent images keep their transparency (WebP), and you never get back a file larger than the one you uploaded.
Dimensions are left unchanged — only quality/compression is adjusted. Need to resize too? Use the Image Resizer.
About
About the Image Compressor
Shrinks an image's file size without changing its dimensions, automatically choosing whichever format gives the smallest file at your chosen quality.
Web developers and bloggers use it to cut page-load-slowing image sizes down before publishing, while anyone with a file-size or attachment limit uses it to squeeze a photo under the cap without cropping or resizing it. None of Toolapt's other free image tools need an account either, and none cap how often you use them.
Examples
Image Compressor examples
3 worked examples
02
Transparent PNG cutout
Upload a 1.10 MB PNG cutout with a transparent background, and it's compressed to a 168 KB WebP — about 85% smaller, with the transparency fully kept.
03
Already-optimized image
Upload a 199 KB JPEG that's already heavily compressed and set quality to 90; since re-encoding would only make it bigger, the tool hands back the original file unchanged.
Related tools
FAQ
Frequently asked questions
Quick answers to common questions about the Image Compressor.
What does the Image Compressor do?
It shrinks a JPG, PNG or WebP image's file size using an adjustable quality level, automatically picking the format that gives the smallest file, while leaving its dimensions unchanged.
Is the Image Compressor free to use?
Yes. It's free, with no sign-up, no watermark and no limit on how many times you use it.
Is my image safe when I use this tool?
Yes. Compression happens entirely on your own device using your browser's built-in Canvas API — nothing is uploaded to a server.
What quality setting should I use?
80% is visually near-identical to the original for most photos while cutting the file size substantially. Go lower (60–70%) for the smallest files where small artifacts don't matter, or higher (90%+) for images with fine text or sharp edges.
What does the Auto format option do?
It encodes your image as both WebP and JPEG at the chosen quality and keeps whichever is smaller. WebP usually wins, often by 25–35% over JPEG at similar visual quality.
Will my transparent PNG lose its transparency?
No. Images with transparent pixels are never converted to JPEG (which can't store transparency) — they're compressed to WebP, which keeps the alpha channel.
What happens if the compressed result is bigger than my original?
The tool detects this automatically — which can happen with images that are already well-optimized — and gives you back the original file unchanged instead of a larger one.
Does this tool resize my image too?
No, dimensions are left exactly as they are — only the compression is adjusted. Use the separate Image Resizer tool on this site if you also want to change the pixel dimensions.
Can I use the Image Compressor on my phone?
Yes. The page is fully responsive and works on mobile, tablet and desktop browsers alike.