Best Image Format for Web, Print, Email, Archive — A Use-Case Guide

Recommended: WebP or AVIF (with JPG fallback); PNG for screenshots, logos, and transparency

Why: Modern web formats compress photos 25–50% smaller than JPG at the same visual quality, which directly improves Core Web Vitals (LCP) and SEO. PNG still wins for graphics with sharp edges, transparency, or screenshots, because lossy compression smears text and lines.

File-size tradeoff: AVIF gives the smallest files but slightly slower decoding on older devices. WebP is the safe modern default — universally supported, smaller than JPG. Use a <picture> element with AVIF → WebP → JPG fallbacks when you want both the size win and bulletproof compatibility.

When to deviate: Deviate to JPG when you can't control the rendering environment (email signatures, embedded PDFs, third-party platforms that strip modern formats). Deviate to PNG when the image has sharp text, UI elements, or needs a transparent background.

Recommended: TIFF or PNG for true color and graphics; high-quality JPG (90%+) acceptable for photographs

Why: Print workflows demand pixel-perfect, lossless data because compression artifacts that are invisible on a screen become very visible at 300 DPI on paper. TIFF is the professional standard — lossless, supports CMYK and 16-bit color, and is accepted by every print shop. PNG is a fine consumer-grade alternative for sRGB images.

File-size tradeoff: TIFF files are huge (often 20–100MB for a single print-resolution image), which is the cost of carrying every pixel uncompressed. PNG is smaller but only handles RGB, not CMYK, so it's better for inkjet/home printing than commercial offset press work. High-quality JPG is a pragmatic middle ground for casual photo prints.

When to deviate: Never deviate to WebP, AVIF, or HEIC for print — most print drivers, RIPs, and pre-press tools still don't accept them. If your print shop only takes JPG, export at 100% quality, 300 DPI, and embed the sRGB color profile.

Recommended: JPG, kept under 200KB per image (1500–2000px on the long edge, 80–85% quality)

Why: JPG is the only format every email client on every platform renders reliably. Email also has hard size limits (Gmail attaches up to 25MB but inline images bloat fast), and many recipients are on mobile data — so a 200KB JPG that loads instantly beats a 4MB pristine PNG that triggers download warnings.

File-size tradeoff: JPG is lossy, but at 80–85% quality the loss is invisible on a phone or laptop screen. Going bigger (5MB+ photo emails) feels generous but is the #1 cause of bounced messages and angry recipients on metered data.

When to deviate: Avoid PNG for photographs (3–5x bigger for no visible benefit). Avoid HEIC at all costs — iPhone users emailing HEIC straight from the Photos app routinely break for Windows, Android, and older Outlook recipients. Convert HEIC to JPG before attaching.

Recommended: TIFF (lossless) or PNG for masters; AVIF (lossless) for modern compressed archives

Why: Archival storage is the one place where file size matters less than fidelity, because you're storing the master copy you'll re-export from for decades. TIFF is the institutional standard (museums, libraries, photographers). PNG is fine for consumer archives. Lossless AVIF is the modern sweet spot — pixel-perfect like PNG but typically 30–50% smaller.

File-size tradeoff: TIFF and PNG are huge but bit-perfect. Lossless AVIF gives you the same fidelity at much smaller sizes, with the caveat that AVIF is newer — if you need 30-year forward compatibility, stick with TIFF. For a personal photo library you'll touch every few years, lossless AVIF is a great choice.

When to deviate: Never archive in JPG, lossy WebP, or lossy AVIF. Each re-save degrades the image (generation loss), so a 10-year-old JPG master that's been opened and re-saved a few times will be noticeably worse than the original. If your only copy is a JPG, convert it to PNG to stop further degradation — though it can't restore detail already lost.