❓ Client-Side Image, Audio & Video Compression FAQ
SlimCodec is a 100% client-side image, video, and audio compression workbench built on browser Canvas 2D, OfflineAudioContext, CompressionStream, and MediaRecorder, executing all encoding in local memory while uploading 0 bytes to any server.
SlimCodec answers key engineering questions regarding browser-native PNG 256-color quantization, EXIF metadata removal, 4-bit IMA ADPCM audio compression, MP4 video bitrate transcoding, and 0 bytes privacy guarantees.
Does SlimCodec ever upload my private images, audio recordings, or videos to a server?
SlimCodec executes 100% of its image, audio, and video compression inside your browser memory using Canvas 2D, Web Audio API, CompressionStream, and MediaRecorder, uploading 0 bytes of media data to any external server over HTTPS.
How does SlimCodec PNG-8 Median-Cut compression shrink PNG files by 60%–80%?
SlimCodec partitions 32-bit RGBA pixels into an optimal 16-to-256 color PLTE/tRNS indexed palette via Median-Cut quantization and Floyd-Steinberg dithering before Deflate compression, reducing each pixel from 4 bytes to 1 byte while keeping PSNR above 36 dB.
What is the advantage of 4-Bit IMA ADPCM WAV over standard 16-Bit PCM WAV in SlimCodec?
SlimCodec implements a compliant RIFF 0x0011 IMA ADPCM encoder that packs each 16-bit PCM sample delta into a 4-bit nibble (a deterministic 4:1 ratio); combined with 22.05 kHz mono resampling, a 10 MB recording shrinks to ~650 KB with native browser playback.
How does SlimCodec compress MP4 and WebM video directly in the browser without heavy plugins?
SlimCodec combines HTML5 Video decoding, Canvas frame-rate sampling, and hardware-accelerated MediaRecorder encoders (VP9/VP8/H.264) to cap frame rates at 24–30 fps and bitrates at 300 kbps–2.5 Mbps, cutting video byte size by 50%–85% with 0 bytes uploaded.
What do the PSNR (dB) and SSIM quality scores mean after compressing an image?
SlimCodec calculates objective fidelity metrics in 10 ms with 0 bytes uploaded: a PSNR (Peak Signal-to-Noise Ratio) above 40 dB indicates visually lossless quality, 32–40 dB represents high-efficiency compression, and an SSIM score near 1.000 confirms preserved structural edges.