16 free audio tools that run entirely in your browser

Most audio tools follow the same pattern. You search for something simple, like trimming a file or boosting the volume. You land on a site. You upload your file to their server, wait for it to process, and then hit a paywall, a signup form, or a 30-second ad before you can download. For a ten-second edit.

Orec has 16 audio tools. All of them are free. All of them run in your browser. Your files never leave your device. There is no account, no upload, no waiting, and no catch.

This is the full list, grouped by what they do.

Edit

These tools handle the basics: cutting, joining, cleaning up, and smoothing transitions.

Audio Trimmer

Drag handles on a waveform to select the exact section you want to keep. Sample-precise with millisecond accuracy. Good for cutting intros, making ringtones, or pulling a clip from a longer recording.

Fade In/Out

Add smooth fade-in and fade-out effects to any audio file. You pick the duration and curve type (linear, exponential, logarithmic, or S-curve). A two-second exponential fade on a podcast intro sounds more natural than an abrupt start.

Silence Remover

Detects and removes dead air from your audio. You control the threshold (how quiet counts as silence) and the minimum duration (how long a pause has to last before it gets cut). Podcast recordings typically lose 10-30% of their length this way. You preview the highlighted silent regions before anything gets removed.

Audio Joiner

Merge multiple audio files into one. Upload your files, drag them into order, set an optional crossfade between tracks, and download the combined result. You can mix formats too. An MP3 and a WAV merge into a single file without issues.

Transform

These tools change the fundamental character of your audio: volume, speed, direction, and dynamics.

Volume Booster

Make any audio file louder or quieter. The slider goes from -20 dB to +20 dB. A built-in hard limiter prevents clipping automatically, so you can push the volume up without worrying about distortion. A +6 dB boost doubles the perceived loudness.

Speed & Pitch Changer

Speed up or slow down audio from 0.25x to 4x. Pitch shifts naturally with speed, like a turntable. Musicians use 0.5x to learn difficult passages. Podcast listeners use 1.5x to get through episodes faster. The tool shows the pitch shift in semitones so you know exactly how far off you are.

Audio Reverser

Reverse any audio file. Drop your file, hear it backwards, download the result. Takes seconds. People use this for backmasking checks, sound design, creative effects, and the occasional "play it backwards" experiment.

Dynamic Compressor

Even out volume levels with dynamic range compression. Loud parts get quieter, quiet parts get louder. Presets for podcast, broadcast, heavy compression, and hard limiting. You can also fine-tune threshold, ratio, attack, release, and makeup gain manually. If your recording has volume jumps between a whisper and a shout, this fixes it.

Analyze

These tools measure and test your audio so you can make informed decisions.

BPM Detector

Find the tempo of any song or audio file. The tool uses onset detection and autocorrelation for automatic analysis. There is also a tap-to-beat mode where you tap along manually. DJs use it to match tempos. Runners use it to find songs at their target pace.

Mic Test

Test your microphone in seconds. You see real-time volume levels, device information, and can record a short test clip for playback. Useful before a podcast session, a video call, or any time you need to confirm your mic is actually working and picking up sound.

LUFS Normalizer

Measure your audio's loudness in LUFS and normalize it to platform standards. Presets for Spotify (-14 LUFS), YouTube (-14 LUFS), Apple Podcasts (-16 LUFS), and broadcast (-24 LUFS). If you are publishing to a streaming platform, normalizing before upload gives you more control over how your audio sounds on playback.

Create

These tools generate audio and visuals from scratch.

Tone Generator

Generate pure tones at any frequency from 20 Hz to 20,000 Hz. Four waveforms: sine, square, sawtooth, and triangle. Switch modes to create white, pink, or brown noise. Or use binaural beats mode with presets for delta, theta, alpha, and beta brainwave states (headphones required). Download everything as WAV. Good for hearing tests, tinnitus frequency matching, audio calibration, sleep, and focus.

Waveform Generator

Turn any audio file into waveform art. Six styles: bars, rounded, mirrored, lines, lines mirrored, and circular. Add gradient fills, text overlays, and background images. Export as PNG, SVG (true vector paths, editable in Figma or Illustrator), or animated MP4/WebM video with your audio synced to the visualization. Size presets for Instagram, TikTok, YouTube, and print.

Effects

These tools add creative effects and convert between channel formats.

Audio Equalizer

A 10-band graphic equalizer covering 31 Hz to 16 kHz. Adjust each band from -12 to +12 dB, or use presets for bass boost, treble boost, vocal boost, rock, jazz, and podcast. If your recording sounds muddy, cut the low-mids. If it sounds dull, boost the high end. The presets handle common scenarios with one click.

Slowed + Reverb

Create slowed + reverb, nightcore, daycore, and vaporwave versions of any song. Presets get you started. Then fine-tune speed (0.5x to 1.5x), reverb amount, and bass boost with individual sliders. Popular for TikTok, YouTube, and SoundCloud edits.

Stereo / Mono Converter

Convert between stereo and mono, or widen the stereo field. To Mono mode averages the left and right channels. To Stereo duplicates a mono signal to both channels. The stereo widener uses mid-side processing to make the sound field wider or narrower. Useful when your audio needs to play through a single speaker, or when you want a more spacious mix.

Why browser-based tools matter

Every tool on this list runs locally in your browser using the Web Audio API. Your audio files stay on your device the entire time. Nothing gets uploaded to a server.

This has real advantages beyond privacy.

No install. You open a URL and the tool works. No downloading an app, no managing updates, no storage space used. A Chromebook can do everything a desktop app can.

No file size limits. When a tool processes files on your device, the only limit is your device's memory. Server-based tools cap file sizes because bandwidth costs money. Local tools do not have that problem.

Works on any device. Phone, tablet, laptop, desktop. Chrome, Safari, Firefox, Edge. If your device has a browser built in the last few years, these tools work on it.

No waiting. There is no upload step and no server queue. Drop your file, change a setting, hear the result. Processing happens at the speed of your device, which for most audio operations is instant.

Record, then polish

Orec started as a browser-based recorder. You open the page, hit record, and get a file. No account, no upload, no limits.

These 16 tools are the natural next step. Record a podcast episode, then trim the dead air, compress the dynamics, normalize to -16 LUFS, and add a fade-in. All in the same browser, all on the same device, all without your audio touching a server.

One tab. Sixteen tools. Your files stay yours.