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Audio & Video

45 tools in this category — all running 100% in your browser. No uploads, no tracking, no accounts.

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Audio Bitrate Calculator

Calculate audio bitrate, file size, duration, and quality metrics entirely in the browser. Supports PCM/WAV, FLAC, ALAC, MP3, AAC, OGG/Vorbis, and Opus. Compute bitrate from sample rate × bit depth × channels (PCM), estimate FLAC/ALAC compression (50–60% of PCM), map lossy quality presets (low/medium/high/voice/music) to typical bitrates, compute file size from bitrate × duration, calculate streaming bandwidth requirement, reverse-calculate required bitrate from target file size, and score quality 0–100. Includes 7 sample rates, 5 bit depths, 4 channel layouts, 7 formats, 5 quality presets, side-by-side format comparison, text/CSV exports, history (localStorage), shareable URL, summary stats. 100% client-side.

Audio Converter

Convert audio files between formats entirely in the browser. Decode with Web Audio API, re-encode to WAV (PCM 16-bit), WebM/OGG (via MediaRecorder), or MP3 (via MediaRecorder with WAV fallback). Multi-format output, 4 bitrate presets, 6 sample-rate presets, mono/stereo channel selection, pure-JS 44-byte RIFF WAV header builder, Float32 to 16-bit PCM converter, file-size estimator, quality score calculator (0-100), lossless-vs-lossy compatibility checker, smart filename generator, conversion history (localStorage), shareable URL, drag-and-drop, and summary stats. 100% client-side.

Audio Converter Reference

Reference for audio format conversion: MP3/WAV/AAC/OGG/FLAC/Opus with quality settings. 100% private. 100% private.

Audio Equalizer

Apply a 10-band graphic EQ to audio entirely in the browser. Drag-and-drop or pick a file, decode with Web Audio API, adjust the gain (-12 dB to +12 dB) on each ISO-standard band (31, 62, 125, 250, 500, 1k, 2k, 4k, 8k, 16k Hz), apply via a chain of peaking BiquadFilterNodes in an OfflineAudioContext for batch processing, and re-encode as a 16-bit PCM WAV (pure-JS encoder). 10+ preset library (flat, bass-boost, treble-boost, vocal-boost, loudness, rock, pop, jazz, classical, podcast), 3-band & 5-band simplified modes, 7 gain presets per band, default Q factor 1.41, gain validator, filter-chain config builder, file-size estimator, text + CSV report, history (localStorage), shareable URL, summary stats. 100% client-side.

Audio Equalizer Reference

Reference for EQ bands, frequencies, Q-factor, and common presets. 100% private. 100% private.

Audio Fade Generator

Apply professional fade in / fade out to audio files entirely in the browser. Drag-and-drop or pick a file, decode with Web Audio API, choose a fade curve (linear, logarithmic, exponential, or S-curve), set fade in / fade out durations (6 presets from 100 ms to 5 s), and re-encode as a 16-bit PCM WAV (pure-JS encoder — no library). Fade gain array generator, per-sample fade applier, fade duration validator, sample-range calculator, ASCII curve visualizer, audio preview before/after, history (localStorage), shareable URL, and summary stats. 100% client-side.

Audio Format Detector

Detect audio file format from magic bytes entirely in the browser. Drag-and-drop a file, we read the first 64 bytes and match against 15+ audio format signatures (MP3 ID3/frame-sync, WAV, FLAC, OGG, M4A/AAC, WMA, AIFF, ALAC, OPUS, APE, TTA, WavPack, Speex, AMR, 3GP). Extracts sample rate, channels, bit depth, duration from headers. Includes MIME lookup, file extension lookup, container info (lossless/lossy), bit-depth & channel-layout tables, format comparison table, closest-match suggestion for unknown formats, confidence score, text/CSV/JSON exports, history (localStorage), shareable URL, summary stats. 100% client-side.

Audio Format Reference

Reference for audio formats (MP3, AAC, FLAC, WAV, OGG, Opus). 100% private. 100% private.

Audio LUFS Reference

Reference for LUFS levels, true peak, and loudness standards (EBU R128, ATSC A/85). 100% private. 100% private.

Audio Merger

Merge multiple audio files into one continuous file entirely in the browser. Drag-and-drop an ordered list, decode each via Web Audio API, auto-unify sample rate and channel count, then concatenate with optional silence gap (6 presets) or linear crossfade (6 presets). Re-encode as 16-bit PCM WAV (pure-JS RIFF encoder — no library). Sample-rate unifier, channel upmixer, linear resampler, silence gap generator, crossfade calculator + applier, buffer concatenator, total-duration calculator, file-size estimator, timestamped filename, history (localStorage), shareable URL, summary stats, drag-and-drop + segment reordering. 100% client-side.

Audio Metadata Editor

View and edit audio file metadata entirely in the browser — ID3v2 tags for MP3, Vorbis comments for OGG / FLAC, and RIFF INFO for WAV. Drag-and-drop a file, auto-detect the format by magic bytes, parse existing fields (title, artist, album, year, track, genre, comment, copyright), edit values, and write them back. ID3v2 (MP3) and RIFF INFO (WAV) support full read + write; OGG / FLAC Vorbis comments are read-only. Includes 126 ID3v1 genre presets (Blues, Classic Rock, …, Dance Hall), case-insensitive field normalization, field length validation, text + CSV report exporters, history (localStorage), shareable URL, and summary stats. 100% client-side — no upload, no library.

Audio Noise Floor Reference

Reference for noise floor levels, dBFS scales, and SNR calculations. 100% private. 100% private.

Audio Noise Reducer

Reduce background noise from audio in the browser using spectral subtraction and a noise gate. Drag-and-drop or pick a file, decode with Web Audio API, estimate the noise floor from a leading silent region, subtract the average noise spectrum from each FFT window, and silence samples below a dBFS threshold. Then re-encode as a 16-bit PCM WAV (pure-JS encoder). 4 strength presets (light/medium/strong/aggressive), 4 noise-gate presets (-30/-40/-50/-60 dBFS), 5 FFT sizes, hanning windowing, magnitude/phase separation, IFFT reconstruction, file-size estimator, text + CSV report, history (localStorage), shareable URL, summary stats (input level, noise level, output level, % noise reduced). 100% client-side.

Audio Recorder

Record audio from your microphone entirely in the browser with MediaRecorder. Multi-format support (webm/ogg/mp3), 4 bitrate presets, max-duration limit, pause/resume, live MM:SS.ms timer, file-size estimator, timestamped filename, in-page audio preview, recording history (localStorage), shareable URL settings, format support detection, permission error handler, and summary stats. 100% client-side.

Audio Reverb Reference

Reference for reverb types, decay times, pre-delay, and room sizes. 100% private. 100% private.

Audio Reverser

Reverse audio playback — flip the sample buffer end-to-start entirely in the browser. Drag-and-drop or pick a file, decode with Web Audio API, choose a reverse mode (full buffer / per-channel / segment-based / interleaved-stereo), apply click-preventing fade in/out at boundaries, and re-encode as a 16-bit PCM WAV. Pure-JS reverse + zero-crossing click detector, segment presets (1/2/4/8/16 segments), time & file-size estimator, audio preview before/after, history (localStorage), shareable URL, summary stats. 100% client-side.

Audio Spectrum Analyzer

Analyze audio frequency spectrum entirely in the browser. Drag-and-drop or pick an audio file, decode with Web Audio API, choose FFT size (6 presets: 256/512/1024/2048/4096/8192) and window function (4 presets: hanning/hamming/blackman/rectangular), render a real-time spectrum on Canvas, find peak frequencies, compute energy in 7 standard frequency bands (sub-bass, bass, low-mid, mid, high-mid, presence, brilliance), dBFS conversion, magnitude calculator, exponential smoothing, 4 color palette presets, text report, CSV export, history (localStorage), shareable URL, summary stats. 100% client-side.

Audio Speed Changer

Change audio playback speed (0.25× to 4.0×) with optional pitch preservation. Drag-and-drop or pick a file, decode with Web Audio API, choose a speed preset (7 from 0.5× to 2.0×) or enter a custom factor, toggle pitch preservation (uses OfflineAudioContext resampling to keep pitch when speed changes), and re-encode as a 16-bit PCM WAV. Pure-JS linear-interpolation resampler, pitch-shift (semitone) calculator, duration & file-size estimator, click-preventing fade in/out, audio preview before/after, history (localStorage), shareable URL, summary stats. 100% client-side.

Audio Splitter

Split an audio file into multiple segments entirely in the browser. Drag-and-drop a file, decode with Web Audio API, and split using one of three modes: equal-count (split into N parts), equal-duration (parts of X seconds each), silence detection (auto-detect quiet regions using dB threshold + min-duration presets), or manual timestamps. Each segment is re-encoded as a 16-bit PCM WAV (pure-JS RIFF encoder) and bundled into a pure-JS ZIP archive (STORE method, no library). Per-segment download links plus a single ZIP download. History (localStorage), shareable URL, summary stats. 100% client-side.

Audio Trimmer

Trim audio files to a start/end range entirely in the browser. Drag-and-drop or pick a file, decode with Web Audio API, set start/end timestamps (MM:SS.ms, HH:MM:SS, or seconds), apply fade in/out (5 presets), and re-encode as a 16-bit PCM WAV (pure-JS encoder — no library). Multi-format time parser, sample-range calculator, 44-byte RIFF WAV header builder, file-size estimator, trim validation, crossfade calculator, audio preview before/after, history (localStorage), shareable URL, summary stats (original duration, trimmed duration, % removed, output size). 100% client-side.

Audio Trimmer Reference

Reference for audio trimming: time selection, fade in/out, format export. 100% private. 100% private.

Audio Volume Normalizer

Normalize audio volume to a target dBFS — boost quiet audio and reduce loud audio to a consistent level. Three normalization modes (peak, RMS, simplified loudness), 8 dBFS presets including EBU R128 standard (-23 LUFS), dBFS ↔ linear gain converter, peak detector, RMS calculator, clipping detector, auto clipping preventer, sample scaler, pure-JS WAV encoder, text report generator, conversion history (localStorage), shareable URL, drag-and-drop, and summary stats. 100% client-side.

Audio Waveform Viewer

Visualize audio waveforms entirely in the browser. Drag-and-drop or pick an audio file, decode with Web Audio API, render peak/RMS waveform on Canvas with zoom (6 presets: 1x/2x/5x/10x/50x/100x), select channel view (left/right/both/mono-mix), detect silence regions (5 threshold presets from -30dB to -80dB, 5 min-duration presets from 100ms to 2s), find top-N amplitude peaks, 5 color presets (blue/green/red/purple/mono), peak list renderer, text report, CSV export (peaks + silence), history (localStorage), shareable URL, summary stats (duration, sample rate, channels, peak count, silence count, % silence). 100% client-side.

Audiogram Podcast Clip Maker

Create audiogram waveforms for podcast clips with customization. 100% private. 100% private.

Bitrate Calculator

Calculate bitrate for audio/video encoding. 100% private. 100% private.

BPM Tempo Detector

Detect BPM by tapping or from audio analysis reference. 100% private. 100% private.

Codec Comparison Tool

Compare audio/video codecs by quality, size, compatibility. 100% private. 100% private.

Metronome

Online metronome with custom BPM, time signature, and accent patterns. 100% private. 100% private.

Sample Rate Reference

Reference for audio sample rates and their use cases. 100% private. 100% private.

Slow Motion Maker

Create slow motion videos with speed control and frame interpolation reference. 100% private. 100% private.

Subtitle Editor (SRT VTT)

Edit SRT/VTT subtitles with time adjustment, search, and format conversion. 100% private. 100% private.

Time-Lapse Maker

Create time-lapse from image sequence with frame rate control. 100% private. 100% private.

Tone Generator

Generate pure tones at custom frequencies (20Hz-20kHz) with volume and duration. 100% private. 100% private.

Video Aspect Ratio Changer

Change video aspect ratio with crop, pad, and blur background modes. 100% private. 100% private.

Video Bitrate Guide

Calculate recommended bitrate for streaming/recording by resolution and FPS. 100% private. 100% private.

Video Compression Guide

Guide for video compression: codec selection, CRF settings, resolution scaling. 100% private. 100% private.

Video Compressor

Compress video files entirely in the browser — reduce file size by lowering bitrate, resolution, and frame rate. Drag-and-drop or pick a video, play it through a hidden <video> + <canvas> + MediaRecorder pipeline at the chosen settings, and download the smaller output as WebM (or MP4 where supported). Bitrate presets (4: 500kbps to 5Mbps), resolution presets (5: 240p to 1080p), aspect-ratio-aware resolution calculator, frame-rate presets (3), compression ratio calculator, file-size estimator, quality score calculator (0-100), format support lookup (webm/mp4), codec support lookup (VP8/VP9/H.264/AV1), filename generator, history (localStorage), shareable URL, video preview before/after, and summary stats (input size, output size, % reduction, compression ratio, quality score). 100% client-side.

Video Format Reference

Reference for video formats (MP4, WebM, AVI, MKV, MOV). 100% private. 100% private.

Video FPS Reference

Reference for frame rates (24/25/30/50/60/120/240), use cases, and conversion. 100% private. 100% private.

Video Frame Extractor

Extract still frames from a video file entirely in the browser. Three modes: single frame at a timestamp, a sequence at multiple timestamps, or an interval (every N seconds). Output formats: PNG, JPEG, or WebP. JPEG quality presets (50/75/90/100%). Frame filename generator (frame-001.png), frame count calculator, resolution scaling (full/half/quarter), pure-JS ZIP archive builder for bundling multiple frames, text + CSV reports, history (localStorage), shareable URL, and summary stats. 100% client-side — uses HTML5 <video> seeked event and Canvas toBlob, with requestVideoFrameCallback when available.

Video Loop Maker

Loop video clips N times with seamless transitions. 100% private. 100% private.

Video Merger Reference

Reference for video merging: concatenation, transitions, format compatibility. 100% private. 100% private.

Video Metadata Viewer

Inspect video file metadata entirely in the browser. Drag-and-drop a video (mp4, webm, ogg, mov, avi, mkv, flv) and read container, codec, resolution, frame rate, duration, bitrate, audio tracks, and more. Pure-JS file-type detector (magic bytes + extension), MIME type lookup, codec name lookup (H.264, VP9, AV1, AAC, Opus, Vorbis), bitrate calculator + formatter (bps/kbps/Mbps/Gbps), file size formatter, duration formatter (HH:MM:SS.ms), aspect ratio calculator, resolution labeler (Full HD, 4K, 8K), 8 common resolution presets, 10 frame-rate presets, container/codec compatibility checker, text + CSV reports, history (localStorage), shareable URL, and summary stats. 100% client-side.

Video Trimmer

Trim video files to a start/end timestamp range entirely in the browser. Drag-and-drop or pick a video, play it through a hidden <video> + <canvas> + MediaRecorder pipeline, and download the trimmed portion as a WebM (or MP4 where supported). Multi-format time parser (4 formats), trim validation, output-format support lookup, file-size estimator (bitrate × duration), 4 bitrate presets, 4 frame-rate presets, 4 resolution presets, 5 fade in/out presets, filename generator, history (localStorage), shareable URL, video preview before/after, and summary stats (original duration, trimmed duration, % removed, output size). 100% client-side.

White Pink Noise Generator

Generate white, pink, and brown noise for focus, sleep, and testing. 100% private. 100% private.