JPEG
The formal name of the JPEG standard behind the .jpg extension used across the web.
Conversion tools
Compression tools
Format details
What is JPEG?
JPEG is the compression standard maintained by the Joint Photographic Experts Group and is the format behind virtually every .jpg file. It uses lossy compression tuned for continuous-tone photographs, letting you trade file size against visual quality. JPEG is a still image format without transparency or animation support.
Specifications
- Typical file size
- Web-optimized: 80-400 KB. High-quality exports: 2-10 MB. Full-resolution camera output: often 5-15 MB.
- Quality
- Optimized for photographs; smooth gradients look clean while sharp edges and text can show blocking or ringing artifacts at aggressive settings.
- Transparency support
- No — No alpha channel; transparent pixels are flattened during export.
- Animation support
- No — JPEG is a single-frame format.
- Compression type
- Lossy (DCT-based)
- Browser support
- Universal across all browsers and platforms.
- Compatibility
- Supported by every OS, camera, phone, browser, editor, and print pipeline.
Advantages
- Excellent compression for photographic content
- Universally supported across devices and software
- Configurable quality slider for fine control
- Progressive encoding option for faster perceived loading
Disadvantages
- Lossy: quality drops with each re-save
- No transparency support
- Weak on text, UI, and flat color regions
- Chroma subsampling can dull vivid reds and edges
Common uses
- Digital photography from phones and cameras
- Website and blog imagery
- Print and photo library archives at high quality
- Ecommerce product photos
- Photo sharing on social platforms
Common conversions
- JPEG to PNG
- PNG to JPEG
- JPG to PNG
- PNG to JPG
Compression tips
- Choose a quality level between 75-85% for web delivery
- Downsize resolution before export instead of relying on quality reduction
- Enable progressive JPEG for large hero images
- Retain a lossless master and export JPEG copies as needed
- Consider WebP or AVIF for modern browsers and use JPEG as a fallback
Frequently asked questions
Either works because they are the same format. Most systems and CMS platforms prefer .jpg for consistency, so use that unless a specific tool requires .jpeg.
No. JPEG blurs text and produces visible artifacts around sharp edges. Use PNG for screenshots and logos, or SVG when you have a vector source.
No. JPEG stores only the final flattened image. Keep working files in your editor's native format and export JPEG for delivery.
A progressive JPEG loads as a low-resolution preview that sharpens as more data arrives, which feels faster on slow connections without changing overall file size much.