Tools / Image Utilities / Lossless & Near-Lossless Compressor

bolt SIMD WASM Engine v4.1 • Thread Pool: 8 Workers Active • Heap: 4.8 MB

Multi-Threaded WASM Engines • SIMD Hardware Acceleration • 100% Client-Side lock Zero-Egress Sandboxed

Lossless & Near-Lossless Image Compressor

Compress PNG, JPEG, WebP, AVIF, and SVG assets in-browser using compiled MozJPEG, OxiPNG, and libvips WebAssembly engines. Reduce file sizes up to 85% with zero server upload.

cloud_upload

Drop photos or raster graphics here to compress

Supports PNG, JPG/JPEG, WebP, AVIF, and SVG. Batch up to 50 files (100MB cumulative limit).

Or click to browse storage • All pixels remain in RAM

insights

Session Savings Analysis 9.58 MB → 2.16 MB (-77.4% Saved)

Process Time 284ms (Total)

Network Egress 0 Bytes

Processed Image Queue

4 / 4 Complete

High tech website dashboard preview banner with glowing nodes, crisp code editors, and telemetry graphs in modern slate and turquoise hues.

PNG

hero_landing_banner.png

4.2 MB → 840 KB -80.0%

check_circle WebP (WASM) SSIM: 0.994 (Lossless Feel)

Minimalist architectural desk setup with mechanical keyboard, precision calipers, technical blueprints, and cold directional studio lighting.

JPG

product_catalog_photo_01.jpg

2.8 MB → 720 KB -74.3%

check_circle MozJPEG 82 SSIM: 0.988 (Trellis Opt)

polyline SVG

architecture_schematic.svg

680 KB → 195 KB -71.3%

check_circle SVGO Vector Paths Clamped (Precision 2)

Smartphone mockup showcasing a refined financial terminal UI with dark charcoal background, mint green sparkline trends, and monospaced balance counters.

PNG

mobile_app_screenshot.png

1.9 MB → 410 KB -78.4%

check_circle OxiPNG Level 6 Deflate Heuristic Perfect

ZIP archive generated in Web Worker memory with Store compression.

tune

Engine Parameters

Auto-Apply

Target Encoding Format

Select "Original" to retain container formats while stripping redundancies.

JPEG / WebP Quality 80%

Aggressive (40) Web Vitals (80) Lossless (100)

Max Downscale Dimension

W px

H px

libvips Lanczos3 resampling with hardware bilinear clamping.

Strip Metadata (EXIF & GPS) Purges geotags, camera lens signatures, and timestamps.

Preserve Color Profile (ICC) Keeps sRGB / Display P3 color gamut tags intact for designer screens.

Progressive Scan (Interlaced) Allows images to render incrementally on low-speed cell networks.

ad_units AdSense High-Density 300x250 Targeted DevTools & Cloud Infra Placements

Under the Hood

How Client-Side WASM Compression Achieves Near-Lossless Efficiency

memory

MozJPEG Trellis Quantization & DCT Matrix

Compiled from Mozilla's C codebase into WebAssembly, MozJPEG recomputes Discrete Cosine Transform (DCT) coefficients using trellis quantization to strike optimal entropy-vs-distortion trade-offs directly in browser memory.

libjpeg-turbo SIMD baseline arrow_forward

visibility

Structural Similarity Index (SSIM) Tuning

Rather than generic peak signal-to-noise ratio (PSNR), our engine evaluates luminance, contrast, and structure metrics against human visual cortex models. Pixels discard imperceptible variations while retaining Retina sharpness.

Threshold: SSIM ≥ 0.985 verified

lock_reset

Zero-Latency Client-Side Batch Processing

All computations execute inside parallel Dedicated Web Workers. The main user interface remains silky-smooth at 120 FPS. Zero bytes of sensitive graphic assets or proprietary marketing visuals leave your local device.

Content-Security-Policy: sandbox security