Convert to JPG

Web display: 85% (invisible loss, optimal size). Print 8×10 or larger: 90-95% (preserve detail). Email attachments: 80% (balance quality/size for 25MB limits). Social media: 82-85% (platforms recompress anyway). Thumbnails: 70-75% (artifacts invisible at small size). Archival: 95-100% (maximum preservation). Professional photography clients: 90-95% (demonstrable quality). Test at actual display size—100% zoom artifacts disappear at 50% view.

Original had transparency that converted to white background (JPG default). Transparent pixels must become solid—JPG format doesn't support alpha channels. Solutions: 1) Choose background color matching destination before converting (blue for blue website), 2) Crop transparent borders before conversion, 3) Use PNG/WebP if transparency required. White halos occur when transparent edges feather into solid background—anti-aliasing assumes wrong color.

No. JPG discards data permanently via lossy compression—converting to PNG just wraps compressed data in lossless container (often larger file, zero quality gain). Original detail is unrecoverable. Always keep uncompressed source files (PSD/TIFF/PNG). Workflow: edit in PNG → final export to JPG. Never iteratively edit JPGs—quality degrades each save. If you must edit JPG, save as PNG until finished, then export JPG once.

Large JPGs indicate: 1) High resolution—4000×3000 photo at 85% = 3-5MB. Solution: resize to display dimensions first (web: 1920×1080 max, email: 1200×800). 2) Quality too high—lower to 80% for web. 3) Complex content—sunset gradients compress poorly. Solutions: crop to subject, reduce dimensions, use JPG Compress tool for additional lossless optimization (quantization table tuning saves 10-20% more). For web, aim for under 500KB per image.

For photos: yes, typically 70-85% smaller. For graphics/text: sometimes larger with quality loss. PNG excels at solid colors and sharp edges (logos, screenshots, diagrams)—compresses via pattern repetition. JPG optimizes smooth gradients (photos)—compresses via DCT frequency analysis. Converting flat-color graphic to JPG often produces larger file with blocky artifacts. Decision rule: photo content → JPG, graphic content → PNG. Test: if image has 10+ distinct solid colors with sharp boundaries, keep PNG.

All transparent pixels convert to selected background color—tool doesn't distinguish semi-transparent from fully transparent. For images with alpha-blended edges (feathered shadows, anti-aliased borders), conversion uses chosen solid color. Result may show hard edges where gradual transparency existed. Workaround: 1) Edit in Photoshop/GIMP to flatten transparency onto preferred background before conversion, 2) Use WebP if modern browser compatibility acceptable, 3) Keep PNG if transparency critical to design.

JPG is inherently lossy—even 100% quality discards data, just minimally. Artifacts appear in: 1) Smooth gradients—8×8 DCT blocks create banding. 2) Sharp edges—ringing around text/lines. 3) Fine textures—high-frequency detail loss. 100% uses minimal quantization but compression still occurs. For truly lossless conversion, use PNG. JPG's strength is photographic content where luminance/chroma loss is imperceptible. For pixel-perfect graphics, JPG is wrong format regardless of quality setting.