Encode one image in all five modern formats in parallel — size + time side by side

Modern Image Format Comparator (PNG / JPEG / WebP / AVIF / JXL)

Pick the right format for a specific photo with actual measurements — and get AVIF / JXL output even in Safari via a WASM fallback.

Réponse rapide

Encode one image across PNG/JPEG/WebP/AVIF/JXL in parallel; see size + time side-by-side. jsquash WASM fallback gives Safari AVIF + JXL output.

Faits clés

Formats compared: PNG / JPEG / WebP / AVIF / JXL
AVIF encode: native + jsquash fallback
JXL encode: jsquash (all browsers)
Metrics: Size + encode time
Processing: Runs in your browser

Idéal pour

Pick the right format via real measurements
Give Safari users AVIF / JXL export
Pre-flight web delivery optimisation

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Comment utiliser

Drag & drop one image
Adjust the quality slider (default 80%)
Click "Compare" — all five formats encode in parallel
Read the table; download any format you need

FAQ

Why these five formats?: PNG is the lossless baseline. JPEG is the legacy compatibility story. WebP is the current web standard. AVIF is the flagship next-gen codec. JXL reaches further still. Each has a different role — the only way to know which wins for your specific image is a real measurement.
Doesn't Safari lack AVIF encoding?: Native yes, but this tool falls back to jsquash (WASM) for AVIF on Safari so you still get output. JXL is the inverse — Safari is currently the only browser with native JXL encode.
Do you show PSNR / SSIM quality metrics?: Phase 2 ships file size + encode time only. Objective quality metrics land in Phase 3.
Batch comparison?: Phase 2 is single-image. Multi-image grid comparison is on the Phase 3 roadmap.

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Outils associés

FAQ

Why these five formats?

PNG is the lossless baseline. JPEG is the legacy compatibility story. WebP is the current web standard. AVIF is the flagship next-gen codec. JXL reaches further still. Each has a different role — the only way to know which wins for your specific image is a real measurement.

Doesn't Safari lack AVIF encoding?

Native yes, but this tool falls back to jsquash (WASM) for AVIF on Safari so you still get output. JXL is the inverse — Safari is currently the only browser with native JXL encode.

Do you show PSNR / SSIM quality metrics?

Phase 2 ships file size + encode time only. Objective quality metrics land in Phase 3.

Batch comparison?

Phase 2 is single-image. Multi-image grid comparison is on the Phase 3 roadmap.