JPEG Compressor – Compress JPEG Online (Free Tool)
Free online JPEG Compressor tool to compress JPEG images with adjustable quality. Reduce file size while controlling image quality. All processing happens locally.
Example Output
Lossy re-encoding at chosen quality. Quality 75-85 is the sweet spot for web photos.
photo.jpg (~600 KB) — 75% smaller, visually identical
What is JPEG Compressor?
JPEG Compressor reduces JPEG file size by re-encoding at a target quality level. Compression runs in the browser using canvas re-encoding — your image stays local. Side-by-side preview lets you verify quality before downloading.
Why use this tool?
- No telemetry, no tracking pixels, no third-party scripts
- Open-and-go: bookmark the page once and never look for an alternative
- Instant results — no waiting on a server or upload progress bar
- Your original file is never uploaded — sensitive screenshots stay on your device
- Output preserves color profile and metadata except when stripping is explicitly requested
How to use
- Drop JPEG/JPG files (single or batch)
- Adjust quality slider (0-100, default 80)
- Side-by-side preview shows visual quality
- Download compressed result — usually 30-70% smaller
Examples
Web photo optimisation
A 3 MB camera JPG drops to ~700 KB at quality 80 with no visible difference at typical viewing sizes.
Email attachment fit
Squeeze a folder of photos under a 25 MB email limit by batch-compressing at quality 70.
Common use cases
- Compressing photo galleries for the web
- Fitting attachments under email size limits
- Reducing storage in personal photo backups
- Preparing JPGs for production deployment
Troubleshooting
- Visible artifacts (blockiness, ringing) at lower quality.
- JPEG produces these by design at low quality. Sweet spot is 75-85. Below 50 introduces obvious degradation; consider WebP at low bitrates instead.
Frequently Asked Questions
For web use, 70-80% quality usually provides a good balance between file size and visual quality. Higher quality preserves more detail but results in larger files.
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