23 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 23 audio tools. Every one of them is free, runs in your browser, and keeps your files on 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.

8D Audio Maker

Apply HRTF spatial processing to make sound appear to rotate around your head. Adjust the rotation speed from 0.1 Hz (one rotation every 10 seconds) to 2 Hz. Works with any audio file. Headphones required. Popular for creative remixes and TikTok edits.

LUFS Meter

Check the loudness of any audio file in LUFS. See the integrated loudness reading, the peak level in dBFS, and a comparison against Spotify, YouTube, Apple Podcasts, and broadcast targets. Use it before you upload to know whether a streaming platform will turn your track up or down.

Audio Censor & Redact

Bleep profanity or redact sensitive words from any recording. An AI model (Whisper tiny or Whisper base) transcribes your audio locally with word-level timestamps. You pick the words to bleep in Censor mode (auto-detects profanity) or Redact mode (click any word manually). The model downloads once and caches on your device.

Lyrics Video Maker

Turn any song into a lyrics video without installing software. Upload your audio, paste the lyrics, and the tool distributes each line evenly across the song duration. Customize fonts, colors, and animation style (fade, typewriter, slide up). Export as MP4 or WebM for YouTube, TikTok, or Instagram.

Rehearsal Timer

Practice presentations with real-time WPM tracking and filler word detection. Set a target time, hit record, and watch your live word count and pace. After the session, see how many times you said "um," "like," or "you know." The count drops each time you practice the same speech.

Audio A/B Tester

Compare two audio files with a blind A/B test. Files are volume-matched so loudness cannot bias your judgment, then labeled X and Y at random. Toggle between them while listening, pick your preference, and click Reveal to see which was which. Useful for comparing mixes, codecs, or processing chains.

Auto-Master

One-click audio enhancement. The tool detects whether your audio is speech or music, then applies a processing chain: high-pass filter, compression, EQ for clarity, a limiter, and loudness normalization. Three intensity levels: Subtle, Standard, and Strong. Preview before and after before downloading.

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.

Open a URL and start. There is nothing to install, no updates to manage, no storage space used. A Chromebook can do everything a desktop app can.

File size limits come from server costs. When processing happens on your device, the ceiling is your device's memory. Server-based tools cap uploads because bandwidth costs money. These 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.

Processing starts the moment you drop your file. There is no upload step and no server queue. Most audio operations finish in under a second.

Record, then polish

Orec started as a browser-based recorder. You open the page, hit record, and get a file. Nothing to sign up for, nothing to upload, nothing capping your recording length.

These 23 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. Twenty-three tools. Your files stay yours.