UD5 Toolkit
Audio Bit Depth Converter - Online 16‑bit ↔ 24‑bit
Change the bit depth of a WAV file without leaving the browser. Dithering option included. For audio engineers.
Multimedia Tools - Audio & Video
99+ toolsSimple Audio Waveform Cutter - Online Trim & Loop
Load an audio file and visually trim it by dragging handles on the waveform. Export the trimmed clip. All local.
WASM Audio Decoder - Online Play FLAC/Opus Locally
Decode FLAC, Opus, or OGG audio files in the browser using compiled WASM libraries. Play instantly without server uploads. Keep audio private.
Online Video Resizer - Crop & Scale Locally
Resize a video by cropping to a new aspect ratio or scaling up/down. Apply and download the result. Browser‑based.
Video Subtitle Burner - Online Hardcode SRT into Video
Merge an SRT subtitle file onto a video directly in the browser. Preview and download the resulting video. All local.
Online Audio Recorder - Record Voice & Export WAV
Record audio from your microphone and export as a WAV file. Monitor levels. Processed entirely in your browser.
Audio/Video Snippet Recorder - Online Temporary Share
Record a short audio or video snippet and get a shareable link (stored locally in browser, no server). For quick feedback.
Online Audio Click & Pop Remover - Clean Vinyl Recordings
Remove clicks, pops, and crackle from audio recordings. Useful for digitizing vinyl. Threshold‑based local processing.
Video Audio Merger/Separator - Online Replace or Remove Soundtrack
Remove the original audio from a video and attach a new soundtrack. Or extract audio. All processed locally.
Online Video Reverser - Play & Save Backwards
Reverse any short video clip and download the backward version. Fun for creative effects. Browser‑based.
Webcam Recorder - Online Capture Video & Save
Use your webcam to record a video clip and download it as WebM. Adjust resolution. Works offline. Privacy‑friendly.
Browser Screen Recorder - Online Record Tab & Download WebM
Record your screen, window, or tab with audio directly in the browser. Download as WebM. No extension required.
Audio Format Converter - Online MP3 WAV FLAC OGG
Change audio files between MP3, WAV, FLAC, and OGG. Choose codec and bitrate. Works completely offline in the browser.
SRT to WebVTT Converter - Online Subtitle Format Changer
Convert .srt subtitles to .vtt format for web video players. Preserves all timestamps and formatting. Local.
Video to MP3 Extractor - Online Save Audio from Video
Extract the audio track from any video and save as MP3 or WAV. No re‑encoding; fast demux. Client‑side only.
Video Keyframe Extractor - Online Capture I‑Frames
Seek through a video and extract only keyframes as JPEGs. Perfect for generating thumbnails. Canvas‑based.
Adaptive Bitrate Streaming Simulator - Online HLS/DASH Demo
Simulate adaptive bitrate logic by switching between different quality video segments. See how ABR algorithms work.
Convolution Reverb Demo - Online Impulse Response Player
Apply realistic reverbs (cathedral, hall, room) to any audio using pre‑loaded impulse responses. Hear the difference instantly.
AudioContext State Visualizer - Online Debug Autoplay
See the current AudioContext state (suspended, running). Resume it with a button. Understand autoplay policies.
Speaker Frequency Sweep - Online Audio Test & Ear Check
Play a sweep from 20Hz to 20kHz. Test your speakers and your hearing. Simple and effective. Web Audio API.
Online Audio Recorder - Record Voice & Export WAV
Record audio from your microphone and export as a WAV file. Monitor levels. Processed entirely in your browser.
Online Audio Noise Reducer - Free Background Hum Remover
Remove constant background noise from a short audio clip using a real‑time noise gate and spectral subtraction. All processing stays in your browser.
Media Session API Demo - Online Now Playing Widget
Set media metadata and play/pause controls for the OS media widget. Test action handlers. Perfect for web audio apps.
Text to Speech Reader - Online Listen to Any Text
Paste or type text and have it read aloud with natural voices. Control speed and pitch. Uses browser's built‑in TTS.
Video to GIF Maker - Online Animated Clip Creator
Trim a video clip and convert it into an animated GIF. Adjust frame rate and size. All local. No watermark.
Online BPM Tapper - Tap to Find Beats Per Minute
Tap any key to the beat of a song and the tool calculates the BPM. Also shows average and millisecond delay for loops.
Audio Visualizer Bars - Online Live FFT Spectrum
Play an audio file or use mic to see real‑time frequency bars. Choose colors. Great for music videos. Canvas.
Web Audio Filter Chain - Online Biquad & Convolver
Apply lowpass, highpass, and reverb to an audio source. See frequency response. Create your own guitar pedal. All local.
Webcam Recorder - Online Capture Video & Save
Use your webcam to record a video clip and download it as WebM. Adjust resolution and see a preview. Works offline.
Video Metadata Viewer - Online Check Codec, Bitrate & Size
Drop a video file and instantly see its container format, codec(s), resolution, duration, and bitrate. Browser‑based, no upload.
Picture‑in‑Picture Tester - Online Float Video Anywhere
Open a test video in Picture‑in‑Picture mode. Control entering and leaving PiP. Copy the code snippet for your own app.
Monophonic Synth - Online Play with Oscillator & Envelope
Play a simple monophonic synthesizer with your keyboard. Choose waveform, attack, decay, and filter. For music fun.
Audio Joiner - Online Concatenate Multiple Files
Upload multiple audio files and join them into a single continuous track. Add crossfade. All local.
Browser Screen Recorder - Online Record Tab & Download WebM
Record your screen, window, or tab with audio directly in the browser. Download the recording as a WebM file. No upload.
Audio Loudness Meter - Online LUFS & RMS Analyzer
Measure the integrated loudness of an audio file in LUFS and RMS. Check if your music meets streaming platform standards. Client‑side.
SSML Marker Demo - Online TTS Events & Highlights
Use SSML <mark> tags to fire events during TTS. See text highlighted as it is spoken. Understand speech synthesis timing. local.
Web MIDI Keyboard Tester - Online Visual Note Display
Connect your MIDI keyboard and see pressed notes visually on a piano roll. Check velocity, channel, and aftertouch. No DAW needed.
Online Audio Reverb Tool - Add Room Ambience
Add artificial reverb to an audio recording. Choose from small room to large hall. Wet/dry mix. Convolution‑based.
Analyser Node Playground - Online Real‑Time Frequency & Waveform
Connect an audio source to an Analyzer Node and display frequency and time‑domain data. Learn Web Audio visualization.
Online Video Trimmer - Cut & Save Clips Locally
Set start and end times for a video and trim it without re-encoding. Download the clip. Pure browser.
Online Video Format Converter - MP4, WebM, AVI in Browser
Convert video files between common formats using FFmpeg WASM. No upload required; all processing stays in your browser.
HTML Audio Visual Emphasis - Online Highlight Spoken Words
Combine TTS with text highlighting. See each word colored as it is spoken. For e‑learning content creation. Local.
Vocal Pitch Monitor & Tuner - Online Real‑Time Frequency
Sing or play an instrument into the mic and see the detected pitch on a real‑time chromatic tuner. Use for practice or ear training.
WebCodecs Video Frame Reader - Online Decode & Display
Decode individual video frames from a local file using the VideoDecoder API. Step through frames. Cutting‑edge browser feature.
Audio Duration Viewer - Online Get Length Without Player
Drop an audio file and instantly see its duration in seconds and formatted time. Read metadata without full playback.
WAV Header Viewer - Online Inspect Audio Format
Drop a WAV file and see its full header: sample rate, bit depth, channels, and chunk structure. Raw bytes explained.
Video Speed Controller - Online Slow Motion & Timelapse
Play any video at 0.25x to 4x speed. Save the modified speed as a new file. Perfect for analysis or fun.
OfflineAudioContext Demo - Online Render Audio Fast
Process audio faster than real‑time with OfflineAudioContext. Apply filters and export the result. Dev tool.
Stereo to Mono Audio Converter - Online Merge Channels
Convert a stereo audio file to mono. Also swap or extract left/right channels. Quick podcast preparation. Browser-based.
Online Audio Compressor - Reduce Dynamic Range
Apply compression and limiting to an audio file with threshold, ratio, attack, and release controls. Improve loudness. All local.
High Quality Video to GIF - Online Optimized Converter
Convert short video clips to GIFs with adjustable resolution, frame rate, and dithering. Preview before download. All local.
Advanced Ambient Noise Mixer - Online Rain, Wind & Cafe
Mix white noise, pink noise, rain, thunder, wind, and cafe sounds. Individual volume, save presets. Relax or focus. All client‑side.
ImageDecoder API Demo - Online Progressive Decode
Decode an image progressively using the ImageDecoder API. See partial results and metadata. Modern alternative to <img>.
SSML Generator & TTS Demo - Online Speech Synthesis
Write SSML to control pitch, speed, and breaks. Play the generated speech with the browser’s TTS engine. Learn SSML.
Random Animal Soundboard - Online Hear Real Calls
Click buttons to play real animal sounds: lion roar, bird tweet, dolphin click. Studio recorded. No load.
Advanced Tap Tempo - Online BPM Averaging & Rhythm
Tap any key multiple times. Shows average BPM, standard deviation, and a visual metronome beat. More accurate than simple tap.
Audio Sample Rate Converter - Online Resample WAV/MP3
Change the sample rate of an audio file (e.g., 48kHz to 44.1kHz) without leaving the browser. Ideal for podcast prep.
WAV to MP3 Converter - Online Audio Compression
Convert WAV audio files to MP3 directly in your browser using a built‑in codec. Choose bitrate and quality. No upload.
Audio Volume Normalizer - Online Loudness Equalizer
Adjust an audio file's volume to a target loudness level (e.g., -14 LUFS). Prevent clipping. Works in the browser.
Video to Audio Extractor - Online Save MP3 from MP4
Extract the audio track from any video file and download it as MP3 or WAV. Works offline; no server upload.