Video to Animated GIF & MP3 Converter
Convert video clips into lightweight animated GIFs or extract audio tracks into MP3s.
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Media Hub · 100% In-Browser Web Audio & WASM Engine
Audio & Video Tools Hub
Comprehensive suite of private, client-side multimedia utilities powered by Web Audio API and WebAssembly. Demux sound from video files, slice audio waveforms, record screen and microphone streams without plugins, eliminate dead air silences, and inspect audio acoustics completely in your browser memory without server uploads.
Tools Grouped by User Purpose & Intent
Showing all tools in this category (28)
1. Video Trimming, Cropping & Transformation
Trim start/end times, crop dimensions, rotate phone clips, adjust playback speed, and merge video segments.
Browser Video Trimmer & Cutter
Interactive video player with timeline markers, live scrub preview, and frame-accurate cutting/export.
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Video Aspect Ratio & Area Cropper
Visual crop overlay (16:9, 9:16 vertical TikTok/Reels, 1:1 square, 4:5) to re-frame and crop video bounds.
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Video Rotate & Flip
Rotate video 90°, 180°, 270° clockwise/counter-clockwise, or mirror horizontal/vertical without sending bytes to a server.
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Video Speed Controller
Accelerate or decelerate video playback from 0.25x (slow-motion) up to 4x (timelapse) with pitch correction preservation.
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Video Concatenator & Joiner
Sequentially combine matching resolution video clips into a single continuous MP4 file.
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Reels & TikTok Safe Zone Preview
Inspect Instagram Reels, Stories and TikTok UI overlays, framing, fit, and safe zones with client-side clean export
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2. Audio Extraction, Trimming & Merging
Extract MP3 from video tracks, slice audio waveforms, combine multiple tracks, and eliminate dead air silences.
Video to Audio (MP4 to MP3/WAV) Converter
Fast client-side demuxing of video tracks; extracts pure audio buffer and encodes it into MP3 or WAV directly in-browser.
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Audio Cutter, Fade & Reverse Studio
Visual waveform audio trimmer with precision time markers, linear/exponential fade envelopes, and one-click audio reversal.
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Audio Track Joiner & Concatenator
Append multiple audio files sequentially into one cohesive audio track with optional crossfade smoothing.
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Audio Noise & Low-Frequency Hum Reducer
Filter background hiss, electrical hums, and low-frequency rumble from voice recordings.
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Audio Silence Detector & Trimmer
Detect quiet regions below a user-selected dB threshold and automatically slice them out to compact podcasts and voiceovers.
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3. Screen Recording, Voice & Subtitles
Capture desktop screen and audio without software, record microphone memos, run TTS, and parse subtitles.
Unlimited In-Browser Screen & Webcam Recorder
Record your desktop screen, browser tabs, and microphone without watermarks or limits.
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Browser Voice & Audio Recorder
Capture microphone audio in high-fidelity 16-bit PCM WAV & WebM with live visualizer waveform and pause/resume.
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Text to Speech (TTS) Voice Reader
Read text aloud with browser Web Speech synthesis. Local system voices run on-device; optional remote voices connect to speech providers.
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Client-Side Video Subtitle Editor & SRT Generator
Transcribe and edit timed subtitle captions with real-time video playback and SRT export.
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Speech to Text
Transcribe spoken audio and video to text, SRT, and VTT with OpenAI Whisper directly in your browser. 100% private, client-side speech recognition.
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Vocal Pitch & Formant Shifter
Web Audio SoundTouch/PitchShift processor altering pitch semitones (-12 to +12) without changing speed (Robot, Chipmunk, Deep Bass presets).
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YouTube Chapter Generator & Timestamp Checker
Generate and validate YouTube chapter timestamps, check formatting rules, calculate durations, and copy ready-to-paste descriptions.
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YouTube Description Builder & Publishing Checklist
Build complete YouTube descriptions with title alternatives, chapter timestamps, safe links, sponsorship disclosure, and a publishing checklist.
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4. Studio Acoustics, BPM & Metadata
Detect musical tempo, keep time with accurate metronomes, verify stereo channels, and edit ID3 tags.
Audio BPM & Tempo Tap Detector
Calculate audio track tempo using an offline peak-filter algorithm or tap manually in real-time with sub-millisecond precision.
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Online Pro Metronome
Sub-millisecond precision metronome with visual beat pulse, accents, time signatures, and tap tempo.
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Left/Right Stereo Channel & Phase Tester
Interactive spatial stereo panner, independent left/right voice prompts, 20Hz-20kHz frequency sweep, and polarity phase verification.
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ID3 Metadata & Album Art Editor
Inspect and edit Title, Artist, Album, Year, Genre, Track Number, and embedded cover art for MP3 files entirely in-browser.
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Media Analysis & Stream Inspector Studio
Inspect video and audio codecs, containers, bitrates, CFR/VFR, and audio/video/text streams 100% locally with side-by-side comparison.
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Additional Category Tools
Additional specialized tools and utilities available in this category.
AI Image Upscaler
Upscale and sharpen images 2× and 4× locally in your browser using ESRGAN deep neural networks; prevent pixelation while preserving details.
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YouTube Thumbnail Previewer
Compare up to 3 thumbnail candidates with custom titles across YouTube desktop, mobile, and sidebar layouts before publishing.
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ZIP Workspace & Archive Manager
Inspect, selectively extract, preview, and create ZIP archives with stream encryption and zip bomb defense.
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Quick Selection Guide: Which Tool Do You Need?
Extract the audio track from a video as an MP3 file
High-speed client-side WASM demuxer without re-encoding quality loss.
Video to MP3 →Trim an audio file or make a custom smartphone ringtone
Visual waveform selector with millisecond-accurate start/end markers.
Audio Trimmer →Record presentation or meeting screen without software
Native browser MediaStream API with system and mic audio capture.
Screen Recorder →Automatically strip dead air pauses from speech/podcast
RMS volume threshold analysis that truncates silent gaps automatically.
Silence Remover →Fix sideways or upside-down mobile phone video recording
Fast 90°/180° rotation matrix adjustment.
Video Rotate →Detect the tempo (BPM) of a music track or beat
Real-time spectral onset detection and peak frequency analysis.
BPM Detector →Real Technical Limitations & Browser Constraints
Client-Side WASM Transcoding Speed
Video re-encoding operates on local CPU threads via WebAssembly; 4K and heavy codecs take longer than dedicated GPU server farms.
Browser Container & Codec Constraints
Supported media depends on browser decoding capabilities; DRM-protected streams and proprietary codecs cannot be opened.
Web Audio Memory Buffer Limits
Processing continuous audio recordings exceeding 2 hours in a single tab can saturate device RAM; break large files into segments.
Related Practical Guides
All Related Practical Guides →
Audio & Video Tools Hub
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~4 min read
How to Shift SRT Subtitle Timestamps and Convert to WebVTT (VTT)
Millisecond-precise subtitle synchronization and WebVTT conversion tutorial using GoToolstack subtitles editor. Explains overlap diagnostics and browser HTML5 video playback.
Read Guide →Explore Other Category Hubs
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