Image Compressor
Shrink JPG and WebP files with a quality slider. See the size savings as you adjust.
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How to Use the Image Compressor
Drop or select a JPG or WebP image. Adjust the quality slider to control the compression level — lower quality means smaller file size. A live preview shows the compressed result alongside the original so you can compare quality before downloading. The file size reduction percentage updates in real time. When you are happy with the result, click Download. Your image never leaves your device — all compression happens locally using the browser’s Canvas API.
About This Tool
Large image files slow down websites, eat up storage, and make email attachments bounce. Image compression reduces file size by selectively discarding visual data that the human eye is least likely to notice. A well-compressed JPG at quality 70–80 is visually indistinguishable from the original for most purposes, while being 50–80% smaller.
This tool uses the browser’s built-in Canvas API to re-encode your image at the selected quality level — no server upload, no third-party library, no privacy concerns. It is ideal for compressing photos before uploading to a website, preparing images for email, or reducing storage usage.
If you need to convert between image formats (e.g., PNG to WebP) rather than just compress, use the dedicated converter. For changing pixel dimensions without quality loss, the Image Resizer is the right choice.
Quick Reference Table
| Quality | Typical Size Reduction | Best For |
|---|---|---|
| 90–100% | 10–20% | Photography portfolios, print-quality images |
| 70–89% | 40–60% | Website images, blog photos, social media |
| 50–69% | 60–75% | Thumbnails, email attachments, previews |
| Below 50% | 75–90% | Low-bandwidth contexts, placeholder images |
Frequently Asked Questions
Is my data safe?
Yes. All compression happens locally in your browser using the Canvas API. Your images are never uploaded to any server, never leave your device, and are not accessible to anyone but you.
How accurate is the compression?
The tool uses the browser’s native image encoding engine, which produces output identical to what the browser uses internally for image rendering. Quality settings map directly to the JPEG/WebP quality parameter (0–100). Results are consistent across modern browsers.
Which image formats can the Image Compressor compress?
The Image Compressor accepts JPG/JPEG, PNG, and WebP inputs. Each format uses a different compression strategy: JPG adjusts the chroma subsampling and quantization quality (1–100 slider), PNG uses lossless palette optimization, and WebP offers both lossy and lossless modes. You can see an instant preview of the quality-vs-size trade-off before downloading.
Will compression affect image dimensions?
No. Compression only reduces file size by adjusting encoding quality. The image width, height, and aspect ratio remain exactly the same. To change dimensions, use the Image Resizer tool.
Can I compress PNG images?
This tool supports JPG and WebP compression. PNG uses lossless compression and does not support the quality-slider approach used here. To reduce PNG file size, convert to WebP using the Image Converter tool, which typically produces much smaller files with similar visual quality.
Created by The Toobits Team · Engineering & Editorial
Toobits is built, tested, and maintained by a small independent engineering team. Every tool is written in TypeScript, runs entirely in the browser, and is reviewed against its source formulas before publication.
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