UD5 Toolkit
SRT to WebVTT Converter - Online Subtitle Format Changer
Convert .srt subtitles to .vtt format for web video players. Preserves all timestamps and formatting. Local.
Multimedia Tools - Audio & Video
99+ toolsVideo 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.
Adaptive Bitrate Streaming Simulator - Online HLS/DASH Demo
Simulate adaptive bitrate logic by switching between different quality video segments. See how ABR algorithms work.
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.
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.
Audio Bit Depth Converter - Online 16ābit ā 24ābit
Change the bit depth of a WAV file without leaving the browser. Dithering option included. For audio engineers.
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 Video Resizer - Crop & Scale Locally
Resize a video by cropping to a new aspect ratio or scaling up/down. Apply and download the result. Browserābased.
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.
AudioContext State Visualizer - Online Debug Autoplay
See the current AudioContext state (suspended, running). Resume it with a button. Understand autoplay policies.
Simple 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.
Monophonic Synth - Online Play with Oscillator & Envelope
Play a simple monophonic synthesizer with your keyboard. Choose waveform, attack, decay, and filter. For music fun.
Online Audio Click & Pop Remover - Clean Vinyl Recordings
Remove clicks, pops, and crackle from audio recordings. Useful for digitizing vinyl. Thresholdābased local processing.
Online Video Reverser - Play & Save Backwards
Reverse any short video clip and download the backward version. Fun for creative effects. Browserābased.
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.
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.
WAV to MP3 Converter - Online Audio Compression
Convert WAV audio files to MP3 directly in your browser using a builtāin codec. Choose bitrate and quality. No upload.
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.
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.
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.
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.
Video Keyframe Extractor - Online Capture IāFrames
Seek through a video and extract only keyframes as JPEGs. Perfect for generating thumbnails. Canvasābased.
SSML Generator & TTS Demo - Online Speech Synthesis
Write SSML to control pitch, speed, and breaks. Play the generated speech with the browserās TTS engine. Learn SSML.
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 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 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. Clientāside.
Music Metadata Editor - Online ID3 Tag Viewer & Writer
View and edit ID3 tags of MP3 files, including title, artist, album, and artwork. All processing in your browser; no files uploaded.
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.
Audio Joiner - Online Concatenate Multiple Files
Upload multiple audio files and join them into a single continuous track. Add crossfade. All local.
Video to MP3 Extractor - Online Save Audio from Video
Extract the audio track from any video and save as MP3 or WAV. No reāencoding; fast demux. Clientāside only.
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 clientāside.
Subtitle File Converter - Online SRT ā VTT & Timestamp Shift
Convert subtitle files between SRT and WebVTT formats. Also shift all timestamps forward/backward. Works locally.
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 builtāin TTS.
Online Audio Noise Reducer - Free Background Hum Remover
Remove constant background noise from a short audio clip using a realātime noise gate and spectral subtraction. All processing stays in your browser.
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.
HTML Audio Visual Emphasis - Online Highlight Spoken Words
Combine TTS with text highlighting. See each word colored as it is spoken. For eālearning content creation. 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.
Text to Sound Wave GIF - Online Typed Audio Art
Type any word and generate a fake audio waveform GIF that looks like the word was spoken. Creative social posts. Canvas.
MP4 to MP3 Audio Extractor - Online Save Sound from Video
Upload an MP4 video and extract only its audio track as an MP3 file. Quick and without server upload. Local processing.
Binaural Beats Generator - Online Brainwave Focus & Relax
Create binaural beats by setting base frequency and beat frequency. Use headphones. For relaxation or focus. Web Audio API.
PictureāināPicture Tester - Online Float Video Anywhere
Open a test video in PictureāināPicture mode. Control entering and leaving PiP. Copy the code snippet for your own app.
Guitar Effect Chain Simulator - Online Virtual Pedalboard
Route your microphone input through a chain of virtual effects (distortion, reverb, delay) using Web Audio API.
Scale & Mode Explorer - Online All Keys Fretboard/Piano
Pick a scale (Major, Harmonic Minor, Dorianā¦) and a root note. Shows the notes and highlights them on piano & guitar fretboard.
Convolution Reverb Demo - Online Impulse Response Player
Apply realistic reverbs (cathedral, hall, room) to any audio using preāloaded impulse responses. Hear the difference instantly.
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.
Online Audio Reverb Tool - Add Room Ambience
Add artificial reverb to an audio recording. Choose from small room to large hall. Wet/dry mix. Convolutionābased.
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.
Text to SciāFi Sound Effect - Online Sonification
Type any word and hear a unique synthetic sciāfi sound effect generated from its letters. Fun audio experiment.
Webcam Recorder - Online Capture Video & Save
Use your webcam to record a video clip and download it as WebM. Adjust resolution. Works offline. Privacyāfriendly.
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 realātime with OfflineAudioContext. Apply filters and export the result. Dev tool.
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.
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.
Video to Animated WebP - Online Free Converter
Select a short video and convert it to an animated WebP image for faster web loading. Adjust quality and size. Local only.
Noise Generator - Online White Brown & Pink Noise Machine
Play white, pink, or brown noise to aid focus, sleep, or tinnitus relief. Infinite loop and volume control. Works in background; no downloads.
Audio Visualizer Bars - Online Live FFT Spectrum
Play an audio file or use mic to see realātime frequency bars. Choose colors. Great for music videos. Canvas.
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.