Compress JPEG Online
Reduce JPEG file sizes by up to 90% with fine-grained quality control. Uses the Canvas API directly in your browser — nothing uploaded, nothing sent to any server.
Drop your JPEG files here
JPEG · JPG files · up to 50 MB each
What is JPEG compression and how does it work?
JPEG is a lossy image compression standard designed for photographs and colour-rich images. It divides the image into 8×8 pixel blocks and applies a Discrete Cosine Transform (DCT) to each block, discarding high-frequency detail the human eye is less sensitive to. The result is a much smaller file with minimal perceptible quality loss at moderate compression levels.
The quality level — expressed as a number from 1 to 100 — controls how aggressively the high-frequency data is discarded. At quality 100, the file is large. At quality 50, significant data is discarded and artefacts may be visible in fine detail areas.
The right quality setting for every use case
| Quality | Best for | Typical reduction |
|---|---|---|
| 90–100 | Print, archival, portfolios | 10–30% |
| 75–85 | Web images, social media | 50–75% |
| 60–75 | Email attachments, previews | 65–80% |
| 40–60 | Thumbnails, rough previews | 75–90% |
Why compress JPEG images?
- Web performance. Images account for most of the page weight on websites. Compressing JPEGs reduces load times, improves Core Web Vitals scores, and directly impacts Google rankings.
- Email attachments. Most email providers limit attachments to 10–25 MB. Compressing your photos before attaching ensures they send without bouncing.
- Platform upload limits. Real estate listing sites, job boards, and school portals often cap image uploads at 1–5 MB. Compressing first prevents upload rejections.
- Storage efficiency. Whether archiving photos on a hard drive or in cloud storage, compressed JPEGs let you store more images in the same space.
- Faster sharing on mobile. Sending large JPEGs over WhatsApp, Telegram, or iMessage consumes significant mobile data. Compressing first makes sharing faster and cheaper.
Frequently asked questions
What JPEG quality setting should I use?
For websites and social media, 70–85 is the sweet spot — files are typically 60–75% smaller than quality 100 with virtually no visible difference at screen sizes. For print or archival, use 90–95. For thumbnails or previews, 50–65 is acceptable.
Does JPEG compression permanently reduce quality?
Yes. JPEG is a lossy format — each time you compress and re-save a JPEG, some image data is discarded. Keep the original file and use the compressed version only for its intended purpose (web, email, etc.).
What is the difference between this and converting to WebP?
WebP achieves smaller file sizes than JPEG at equivalent visual quality. If you need a JPEG specifically — for a platform requirement, email compatibility, or printing — use this compressor. If format does not matter, converting to WebP will give you an even smaller file.
Is my JPEG uploaded to a server?
No. All compression runs in your browser using the Canvas API. Your file never leaves your device — not even temporarily.