CriticStudio Video Editor & Mastering Studio
Edit any video 100% locally in your browser: frame-accurate filmstrip timeline, 9:16 blurred background fill, 12 cinematic 3D LUTs, green-screen chroma key, SRT caption burner, and live broadcast scopes.
Drop a single video file here to open in Video Studio, or browse
Supports MP4, WEBM, MOV, MKV, AVI, FLV, WMV, M4V, MPEG, TS, OGV, 3GP, GIF, WEBP, APNG & Audio tracks. Need to convert multiple files at once? Switch to the Batch Converter tab.
Use the timeline below to drag the amber IN and OUT handles, or position the red playhead anywhere and click Split at Playhead to cut out unwanted middle sections.
CriticStudio Batch Video & Audio Converter
Batch convert multiple video files between 27 studio, web, animated image, and audio formats in your browser with millisecond trim, 200% soft-knee volume boost, and WSOLA pitch shifting.
Drop multiple video or audio files here for batch conversion, or browse
Supports all 27 formats (MP4, WEBM, MOV, MKV, AVI, FLV, WMV, GIF, WEBP, APNG, MP3, WAV, FLAC, M4A, AAC, OPUS, OGG, AC3). Expand any queued card for quick trim, volume & pitch!
Add Files to Batch QueueBatch Conversion Queue
0Video, Animated Image & Audio Format Specifications
Every container format supported by CriticStudio's single-video NLE and batch converter, plus our interactive 702-route SEO directory.
Cinema, Broadcast & Web Video
Full frame-accurate decoding, 60fps canvas compositing, and muxing across modern and legacy video containers.
Looping GIF89a, APNG & WebP
Pure-JavaScript GIF89a LZW quantization with ordered Bayer dithering and 24-bit RGBA Animated PNG chunk assembly.
Studio Audio Extraction & Mastering
Extract audio from any video with 200% soft-knee limiting, WSOLA constant-tempo pitch shifting, and 3-band EQ.
Container & Codec Comparison Table
| Format | Category | Video / Image Codec | Audio Codec | Alpha Channel | Primary Studio Use Case |
|---|---|---|---|---|---|
| MP4 | Video Container | H.264 / AVC1 / VP9 | AAC-LC / Opus | No | Universal YouTube, TikTok, Reels, Shorts, iOS & Web playback |
| WEBM | Web Video | VP9 / VP8 | Opus (48kHz) | Yes (VP9) | HTML5 web video, Discord embeds & high-efficiency streaming |
| MOV | Cinema / Apple | H.264 / QuickTime | AAC / PCM | Yes | macOS, Final Cut Pro, DaVinci Resolve & iPhone camera masters |
| MKV | Matroska | VP9 / H.264 | Opus / Vorbis / AAC | Yes | OBS Studio recordings, remuxing & multi-track archival |
| AVI | RIFF Video | Motion JPEG (MJPG) | 16-bit Linear PCM | No | Intra-frame NLE scrubbing, hardware players & Windows legacy |
| GIF | Animated Image | GIF89a LZW + Bayer | Silent Loop | 1-bit | GitHub READMEs, Slack/Discord reactions & documentation loops |
| APNG | Animated PNG | 24-bit RGBA acTL/fdAT | Silent Loop | 8-bit Full | Lossless true-color UI animations & transparent sticker loops |
| MP3 | Audio Extract | — | MPEG-1 Layer III (CBR) | — | Universal podcast, voiceover & soundtrack extraction (up to 320 kbps) |
| WAV / FLAC | Lossless Audio | — | 16-bit PCM / FLAC | — | Bit-exact studio stems for Pro Tools, Logic Pro, Ableton & FL Studio |
Interactive Studio & Format Route Directory
CriticStudio Knowledge Base & Mastering Guide
How CriticStudio edits, grades, keys, and encodes HD/4K video 100% locally inside your browser with zero external server uploads.
Real-Time 60fps Pixel Grading & Scopes
Every video frame is composited through a 10-parameter color pipeline (Exposure, Contrast, Saturation, Vibrance, Warmth, Tint, Highlights, Shadows, Sepia, Vignette) and blended with 12 cinematic 3D LUT curves while live RGB Parade, Luminance Waveform, and Histogram scopes measure broadcast legality in real time.
Green/Blue Screen Removal & Spill Suppression
Instead of naive RGB thresholding, CriticStudio converts pixels into YCbCr color space to measure Euclidean chrominance distance (`Cb, Cr`), applying smooth alpha feathering and automatic green/blue spill desaturation on hair and edges.
Constant-Tempo Pitch & Soft-Knee Mastering
Our custom Waveform Similarity Overlap-Add (WSOLA) engine shifts voice or music pitch from `-12` to `+12` semitones using Hann-windowed cross-correlation without altering video duration, paired with a `tanh` soft-knee mastering limiter for distortion-free 200% volume boosts.
Pure-JavaScript Binary Container Encoders
Exporting to GIF runs an in-memory 256-color 6×6×6 RGB + grayscale palette quantizer with 4×4 ordered Bayer dithering and variable-width LZW bitpacking. Exporting to AVI or APNG constructs spec-compliant `RIFF AVI MJPG` and `acTL/fcTL/fdAT` CRC32 binary chunks directly in RAM.
Dual-Pass Aspect Ratio Reframing
Converting 16:9 widescreen footage into 9:16 vertical or 1:1 square formats automatically renders a scaled, darkened Gaussian-blurred background pass behind the sharp foreground frame—eliminating ugly black pillar/letterbox bars.
Hardcoded Captions & Privacy Redaction
Upload or paste `.SRT` or `.VTT` timecoded captions to burn high-contrast, word-wrapped subtitles directly into the video stream, or enable the draggable Privacy Censor Box to pixelate/blur faces, license plates, and sensitive UI regions.
Platform Export Cheat Sheet
| Target Platform | Format | Aspect Ratio | Resolution & FPS | Recommended Studio Features |
|---|---|---|---|---|
| YouTube 4K / Full HD | MP4 / MOV | 16:9 | 2160p or 1080p @ 60fps | Rec.709 / Teal & Orange LUT + 16 Mbps Bitrate + 120% Limiter |
| TikTok / Reels / Shorts | MP4 | 9:16 Vertical | 1080×1920 @ 30/60fps | 9:16 Blurred Background Fill + Burned SRT Subtitles |
| Discord / Web Embeds | WEBM | 16:9 or 1:1 | 720p @ 30fps (4 Mbps) | Trim IN/OUT + Split & Cut Middle + Fast WebM VP9 |
| GitHub README / Docs | GIF / APNG | Orig or 16:9 | 480p @ 12fps Loop | 1.5x Speed + Bayer Dithered GIF89a LZW Encoder |
Frequently Asked Questions
Everything you need to know about CriticStudio's Single-Video NLE Studio and Batch Converter.