How Image Compressor (JPG, PNG & WebP Quality Slider + Local Canvas) Works & When to Use It
Compress JPG, PNG, and WebP images locally in your browser using an adjustable quality slider (10%–95%) and optional max dimension cap to reduce KB size for fast web loading or portal uploads. Calculations and file processing run in this browser tab. The tool does not send working inputs or files to our hosting server.
Step-by-Step Instructions
- Choose a supported file or enter the labelled values for this tool.
- Adjust the output options and wait for processing to finish. Reset clears the selected files and restores default settings.
- Download the result, then check the actual saved file before using it.
Worked Examples
| Scenario | Input Parameters | Example Output |
|---|---|---|
| Compress 1,200 KB Product Photo @ 75% WebP (~270 KB) | {"origKb": 1200, "quality": 75, "outputFormat": "image/webp"} |
~270 KB (Saves 77.5% from 1200 KB) |
| Compress 850 KB Document Scan @ 60% JPEG (~230 KB) | {"origKb": 850, "quality": 60, "outputFormat": "image/jpeg"} |
~214.2 KB (Saves 74.8% from 850 KB) |
Format reference and processing
- Reference Standard / Authority: HTML5 Canvas.toBlob(mime, quality) Lossy/Lossless Compression
- Privacy & Execution Mode: Browser-Local Only (HTML5 Canvas / ArrayBuffer — Zero Upload) (None (Native HTML5 Canvas, FileReader & PDF-1.4 Builder))
Important Limitations & Edge Cases
Browser memory limit: files up to 25 MB / 8000×8000 px are recommended on mobile devices. PNG compression converts or quantizes via WebP/JPEG when quality < 100%. Keep the original file. Check the saved format, dimensions, page order and content before replacing or sharing a document.
Frequently Asked Questions (FAQs)
1. Is Image Compressor (JPG, PNG & WebP Quality Slider + Local Canvas) completely free to use without registration?
Yes. Every tool on Easy Tools Today is 100% free with no paywall, no sign-up, and no subscription required.
2. Are the numbers or files I enter uploaded to any server?
Calculations and file processing run in this browser tab. The tool does not send working inputs or files to our hosting server.
3. What should I check in the saved output?
Keep the original file. Check the saved format, dimensions, page order and content before replacing or sharing a document. Reference: HTML5 Canvas.toBlob(mime, quality) Lossy/Lossless Compression.