Image Compressor
Compress images online and reduce file size without unnecessarily sacrificing visual quality.
Drop your images here
or
Choose ImagesJPG • PNG • WebP • AVIF
Your images are processed locally in your browser.
How it works
Smaller files, fewer steps.
Choose your images, set a quality level, and download the optimized files. Everything happens in your browser, so your images stay on your device.
1. Add your images
Drop one image or a whole batch into the upload area.
2. Tune the result
Use a preset or adjust quality, format, and target size.
3. Download instantly
Compare the result and download individual files or the full batch.
Frequently asked questions
Are my images uploaded?+
No. Compression runs locally in your browser and images are not sent to a server.
Which formats are supported?+
You can compress JPG, JPEG, PNG, WebP, and AVIF files when your browser supports AVIF decoding.
What does the quality setting do?+
Quality controls the image encoding level. Lower values usually create smaller files, while higher values preserve more detail.
Free Image Compressor Online
Use ToolCribz as a free online image compressor to compress images online and reduce image file size in your browser. Add multiple images, adjust compression quality, choose an output format, or set a target size in KB or MB. Preview the result before downloading. There is no account or signup required.
This image compression tool can help optimize image size for a website, email attachment, social post or online application. The best result depends on each image and its intended use, so compare the compressed preview with your original before using it.
Supported Image Formats
Upload JPG, JPEG, PNG, WebP or AVIF images. AVIF decoding and encoding depend on browser support. Animated GIF and SVG files are not accepted by this compressor.
Compress JPG Images
Reduce JPG or JPEG file size for websites, social media, email, documents and online applications. JPG does not retain transparency; transparent areas are filled with white when saving as JPG.
Compress PNG Images
Re-encode PNG images while retaining their supported transparency. PNG output is handled by the browser's PNG encoder, so the quality control may not work like it does for JPG or WebP.
Compress WebP Images
Compress WebP files or select another available output format. WebP quality and file size depend on the browser's image encoder and the image content.
Compress AVIF Images
AVIF images can be selected where the browser supports AVIF decoding. AVIF output is available only when the browser supports that encoding format.
Reduce Image Size Without Losing Quality
The compressor decodes your selected image in your browser, draws it to an HTML canvas and re-encodes it using the chosen format and quality setting. For JPG, WebP and browser-supported AVIF, lowering encoder quality can remove visual information. PNG uses the browser's PNG encoder, whose output is not controlled in the same way by the quality slider.
When you set a target file size, the tool tries several quality levels and may reduce the image dimensions if needed to get closer to the target. The final size can differ from the requested size, and visual quality can change. There is no guarantee of 100% lossless compression or of reducing every image.
Compress an Image to a Target Size
To reduce image size to a file limit, enable the target-size setting, enter the amount in KB or MB, and compress the image. You can try targets such as 20 KB, 50 KB, 100 KB, 200 KB or 500 KB, including compressing a JPG or PNG to 100 KB. Complex images, browser encoder limits and minimum dimensions may prevent the output from reaching an exact target.
How to Compress Images Online
- Select or drop one or more JPG, JPEG, PNG, WebP or AVIF files.
- Choose a quality preset or adjust the available settings.
- Optionally choose an output format or enter a target size.
- Compress, review the before-and-after preview, then download.
To reduce image dimensions rather than only re-encode the file, use the Image Resizer. You can also convert image formats, convert images to PDF, crop an image, remove image metadata, flip or rotate an image, or optimize an SVG.
Image Compressor FAQs
What is an image compressor?
An image compressor re-encodes an image to reduce the amount of data in its file. The resulting file may be smaller, but the amount of reduction depends on the image, output format, browser encoder and chosen settings.
How do I compress an image?
Choose or drop a supported image, select a quality preset or output format, and optionally enable a target size in KB or MB. Select Compress, compare the result with the original, then download it.
How can I reduce image file size?
Use the quality setting or set an optional target size, then compare the compressed preview and file size. Converting to another format or reducing image dimensions can also affect size; use the Image Resizer when you need precise dimensions.
Can I compress JPG images?
Yes. Upload JPG or JPEG images and compress them in the browser. JPG does not preserve transparency; converting a transparent image to JPG fills transparent areas with white.
Can I compress PNG images?
Yes. PNG files are supported. The browser's PNG encoder controls the output, so the quality slider may not affect PNG size the same way it affects JPG or WebP. A target-size attempt may also reduce image dimensions.
Can I compress WebP images?
Yes. WebP files are supported when your browser can decode them. You can keep the original format or choose an available output format.
Does compressing an image reduce quality?
It can. Re-encoding JPG, WebP or AVIF at a lower quality may discard visual detail. Compare the preview and keep your original if the result is not suitable. No setting guarantees that an image will become smaller without any visible or data change.
What is the difference between lossy and lossless compression?
Lossy compression can remove image information to reach smaller files, which may affect detail. Lossless compression preserves the decoded image data but often achieves a smaller reduction. This tool re-encodes through your browser's canvas rather than promising a lossless result.
How much can an image be compressed?
There is no fixed amount. Results depend on the original format, image content, dimensions, output format, browser and settings. Some images shrink substantially; others may shrink only a little or even grow.
Can I compress images on my phone?
You can use the tool on a phone with a modern browser that supports the image format and canvas encoding. Browser and device capabilities vary, especially for AVIF.
How do I compress an image for a website?
Upload the image, choose a supported web format and a quality level that looks good in the preview, then download the smaller file. Choose dimensions separately with the Image Resizer if the website has width or height requirements.
How do I reduce an image to 100 KB?
Enable target file size, enter 100, select KB and run compression. The tool tries different encoder quality levels and may reduce dimensions to get closer, but the exact target is not guaranteed for every image or browser.
How do I compress a photo without losing quality?
A smaller file with absolutely no quality or data change cannot be guaranteed. Start with a higher quality preset, compare the preview, and keep the original. If dimensions are larger than needed, resizing may reduce file size without lowering the resolution you need.
Is image compression safe?
The compression processing happens in your browser: selected image files are decoded and re-encoded locally and are not uploaded to ToolCribz for compression. Use a device and browser you trust, and avoid sharing the downloaded result if it contains sensitive information.
Does ToolCribz store uploaded images?
No. Image files are handled locally in your browser and are not sent to ToolCribz's servers for compression. The browser creates temporary local preview and download data while you use the page.