Compress JPG Images
Reduce large JPG files to smaller sizes like 200KB or 50KB instantly. Solves storage limits and upload restrictions.
Technical Notes
Image conversion quality depends on the codec, compression ratio, and color profile of the output format. Lossy formats like JPEG discard imperceptible data to reduce file size — at 80–85% quality this is typically invisible to the human eye. Lossless formats like PNG preserve every pixel but produce larger files. EXIF metadata (camera model, GPS coordinates, date) is preserved where possible, but some browsers and privacy settings may strip it during export. All processing happens locally in your browser using WebAssembly — no file ever reaches a server.
How to Compress JPG Files
Upload
Drag and drop your JPG images directly into the browser.
Adjust Quality
Set a target size (e.g., 200KB) or adjust the quality slider for the desired compression ratio.
Download
Download optimized files individually or as a ZIP.
Privacy Guaranteed
We use WebAssembly technology. Your photos are processed in your browser, never uploaded to our servers.
Instant Speed
No upload time means faster results. The conversion happens instantly on your device.
Batch Conversion
Convert up to 50 files at once. Drag, drop, and convert your entire gallery in seconds.
🔒 Private, Local Compression
Your files are processed entirely in your browser with WebAssembly. No uploads, no server storage, and no tracking.
- ✓ Zero uploads: processing happens in RAM
- ✓ No storage: files are never saved on a server
- ✓ Works offline: after the first load
🔬 Understanding JPG Compression
How JPEG compression works
JPG is a lossy format optimized for raster graphics. It uses a DCT pipeline and quantization to reduce high‑frequency detail.
- Split the image into 8×8 pixel blocks
- Transform pixels into frequencies (DCT)
- Quantize high frequencies to shrink size
- Apply Huffman coding to reduce file size
🎯 Quality targets
| Quality % | File Size | Best For |
|---|---|---|
| 95–100% | Largest | Print, archival, professional photo |
| 85–90% | Medium | Web galleries, portfolios |
| 75–80% | Small | Social, email attachments |
| < 70% | Smallest | Thumbnails (visible artifacts) |
Target size compression
Need a hard cap like 200KB? Use Target Size and we auto‑tune quality to reach the size with minimum visual loss.
📱 Platform guidance
Recommended: 1080×1080 or 1080×1350
Quality: 80–85%
Tip: keep under 200KB for fast loads
Profile: 400×400 minimum
Cover: 1584×396
Quality: 90% for professional look
Email attachments
Typical limit: 25MB per email
Recommended: 1–2MB per image
Tip: resize to 1920px max width
🧩 Compression artifacts
Lower quality settings introduce artifacts such as blocking and mosquito noise. These are more visible on edges and text.
Blocking
Visible 8×8 squares from heavy quantization.
Banding
Color gradients appear stepped instead of smooth.
Ringing
Halos around sharp edges or text.
If you need lossless output or transparency, use PNG. For vectorization, convert to SVG with a vector tool instead of JPG.
🔧 Troubleshooting
File size barely changed
The image was already compressed. Try lowering quality or resizing dimensions to improve the compression ratio.
Colors look washed out
JPG is limited to sRGB in most browsers. For color‑critical work, keep metadata profiles or use PNG.
Metadata and EXIF
Compression may drop some metadata. Use the Remove EXIF tool for full privacy control.
🎯 When to compress JPG
🌐 Web performance
Improve LCP and reduce bandwidth with smaller hero images.
📄 Document portals
Meet strict 200–500KB upload limits with target size.
📱 Mobile apps
Quality 70–80% reduces app size significantly.
✉️ Email marketing
Gmail clips heavy emails; keep headers under 100KB.
❓ Frequently Asked Questions
Can I compress to a specific size?
Yes. Use Target Size and enter a KB value; the tool tunes quality to hit it.
Is repeated compression safe?
Repeated compression compounds loss. Keep the original and compress once.
Does compression remove EXIF?
Some EXIF may be dropped. Use the Remove EXIF tool if you need full stripping.
Should I resize or lower quality?
Resize first. A 1920px image at 90% can be smaller than a 4000px image at 80%.
Does it work offline?
Yes, after the first load the tool can run offline.
Can I undo compression?
No. Compression is irreversible, so keep your original file.