Image Compressor: free online image compressor

Use this free image compressor to make supported images smaller before uploading them to a website, sharing them by email or sending them to a client. Choose an output format and quality, then compare the file size and visual result.

When to use image compressor

Smaller images can reduce upload time and data transfer. Compression is especially useful for photographs and web images, but the best settings depend on the image and where it will be used.

How to use this image compressor

Select an image, choose an output format and quality, then click Compress Image. Preview the result and download it if the quality and size suit your needs.

1. Select the correct your source file file from your device.
2. Choose the available output settings that match your intended use.
3. Start the conversion and keep the browser tab open while processing finishes.
4. Download the the required format result and open it to confirm that it looks right.

Common uses and practical examples

An image compressor helps reduce file size before uploading photos to a website, sending images by email or sharing them with a client. Compression is especially useful when a platform has an upload limit or when large image files make a page slower to transfer. The best setting depends on whether the image is a photograph, a screenshot, a logo or a graphic with fine text.

Output quality, format and compatibility

Start with a moderate quality setting and compare the preview with the source. Lower quality often produces a smaller file but can create blur, blockiness or colour banding. JPG is commonly suited to photographs but does not preserve transparency; PNG is useful for sharp graphics and transparency; WebP can be efficient for many web images. There is no guarantee every output will be smaller.

Lossy compression can reduce fine detail. PNG transparency may not remain when converted to JPEG. Keep an original copy when image quality matters.

Tips for better results

For website performance, compressing images is only one step. Also upload suitable dimensions, avoid serving a desktop-sized image to a tiny mobile slot, and use caching where appropriate. Keep a high-quality original so you can export again with different settings. Check the final file size and visible quality rather than relying on the selected percentage alone.

Privacy and browser-based file processing

For supported operations, processing happens in your browser and the tool does not intentionally upload your selected file to this website. Some document features depend on JavaScript libraries loaded from a content delivery network, so an internet connection may be needed to load those libraries. Browser processing still uses your device memory and processor; very large files may take longer or fail on older devices. Use a trusted device for sensitive work and remove downloaded copies from shared computers when finished.

Troubleshooting conversion problems

If the tool does not accept a file, check that its actual format matches the filename extension and that the file opens normally in another application. A damaged, encrypted, unusually structured or very large file may not process successfully. Refresh the page, use an up-to-date browser and try a smaller sample if needed. Network restrictions, privacy extensions or a firewall can block a required library from loading. If the output downloads but looks wrong, repeat the conversion with suitable settings and compare it with the original.

Frequently asked questions about image compressor

How do I compress an image?

Choose an image, select the output format and quality, then click Compress Image. Review the output before downloading.

Will every image become smaller?

No. The result depends on source format, image content and settings. Some outputs may be larger.

Does compression reduce quality?

Lossy formats can reduce detail. Use a higher quality setting if preserving detail matters.

Does the tool upload images?

The selected image is processed in your browser and is not intentionally uploaded to this website.

Which formats are supported?

The tool can process image formats that your browser can decode and export to supported formats.

A simple checklist for reliable results

Before you start, confirm the receiving website or application accepts the output format and check any stated file-size or dimension limits. Choose a source file that opens correctly, then use the settings offered on this page rather than changing the filename extension manually. After processing, download the generated file and open it independently. For images, inspect sharpness, colours, transparency and dimensions. For documents, check page order, text, tables, headings and page breaks. If the output is intended for a formal submission, compare it against the original and follow the recipient’s instructions. These quick checks help prevent common problems such as uploading the wrong format, sending an unreadable page or using a file that exceeds an upload limit.

Choosing the right tool for the next step

Different file tasks can sound similar but produce different results. Converting a format changes how the file is encoded; resizing changes image dimensions; cropping removes part of an image; compression aims to reduce file size; and creating a PDF places content into a document container. PDF-to-image conversion produces a page picture, while PDF-to-Word aims to make text editable and may need formatting corrections. Select the tool based on the result you actually need, not only the file extension. If this page does not offer a required feature such as batch processing, OCR, transparent-background removal or detailed page editing, use a specialised workflow rather than expecting a basic converter to perform it automatically.