Image Compressor
Compress JPG, PNG, and WEBP images directly in your browser. Drop a photo, choose your quality level, and download the compressed result. Everything happens locally on your device — your image is never uploaded to a server. This tool typically reduces file size by 40–90% while keeping the image visually indistinguishable from the original.
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How image compression works
Every digital image is a grid of pixels, and each pixel takes up memory. Compression reduces the amount of data required to store an image by identifying patterns, discarding imperceptible detail, and encoding the rest more efficiently. There are two types of compression:
- Lossy compression (JPG, WEBP): Permanently removes some detail to achieve dramatic size reductions. At quality 75–85%, most viewers cannot tell the difference from the original.
- Lossless compression (PNG, lossless WEBP): Preserves every pixel exactly, but yields smaller reductions — usually 10–30%.
This tool uses your browser's built-in canvas.toBlob() method, which delegates to the operating system's native image encoder. On Chrome, Firefox, Safari, and Edge, this encoder is highly optimized. Results are equivalent to what you'd get from a desktop photo editor.
When to use JPG, PNG, or WEBP
JPG (JPEG)
The most universally compatible format. Best for photographs and any image where file size matters more than pixel-perfect accuracy. Does not support transparency — a transparent region will be filled with white or black. Use quality 75–85% for photos, 60–70% for thumbnails.
PNG
Lossless and supports transparency. Best for logos, screenshots, graphics with text, and any image that will be edited further. File sizes are typically 2–5× larger than JPG at equivalent visual quality. Choose PNG when you need a transparent background.
WEBP
A modern format developed by Google. Supports both lossy and lossless modes, plus transparency and animation. Typically 25–35% smaller than JPG at the same quality. Browser support is universal in 2025. Recommended as the default for web use.
Tips for getting the best compression
- Resize before compressing. If you're uploading to a website, you rarely need an image wider than 1600px. Reducing width first has a bigger impact on file size than lowering quality.
- Choose the right format. Photos → JPG or WEBP. Logos → PNG or WEBP. Screenshots → PNG (or WEBP for smaller size).
- Don't over-compress. Quality below 60% usually introduces visible artifacts, especially around text and sharp edges. Test the result visually before deploying.
- Compress multiple times isn't better. Compressing an already-compressed JPG degrades quality further. Always start from the original file.
Why this tool is faster than online compressors
Most "free online image compressors" upload your image to a server, compress it there, and send it back. That means your file leaves your device, waits in a queue, and travels across the internet twice. It also means the site has to store the file temporarily — a privacy concern.
This tool compresses the image inside your browser using the same native encoder your OS uses. For a 5 MB photo on a mid-range phone, compression takes about 200–400 milliseconds. There's no upload, no waiting, and no privacy risk.
Frequently asked questions
What is the maximum file size I can compress?
Up to 25 MB per file. On very low-memory devices, extremely large images may fail to load — if that happens, try resizing first or use a smaller version of the image.
Does compression reduce image dimensions?
Not by default. Compression reduces file size by discarding detail, but the pixel dimensions stay the same. If you also want to resize, use the "Max width" field or visit the image resizer.
Can I compress an animated GIF?
Animated GIFs are supported but only the first frame will be compressed, and the output will be a static image. Full animated GIF compression is not yet supported.
Is the image quality preserved?
At quality 75–85%, most photos look identical to the original. Only if you zoom in to 200% or more will you notice subtle differences in fine detail. Screenshots, logos, and text-heavy images may show visible artifacts at lower quality settings — use PNG for those.
Can I compress multiple images at once?
This version handles one image at a time. Batch compression is on our roadmap.
Why is my WEBP smaller than my JPG?
WEBP uses a more efficient encoding algorithm than JPG. At the same visual quality, WEBP files are typically 25–35% smaller. Almost every modern browser and email client supports WEBP.