Free Audio Editor Online
A complete audio editor that runs entirely in your browser. Boost volume, shape EQ, remove silence, generate captions, and export — no software to install, no files uploaded to servers, no watermarks on your output.
Upload a file · Boost, EQ, export · 100% in your browser
Finding a genuinely free audio editor online that does not cripple your output with watermarks, degrade quality through server-side re-encoding, or demand a credit card after your "free trial" expires is surprisingly difficult. Most browser-based audio tools either limit export to 30 seconds, stamp an audio watermark over your file, or process everything on their servers — meaning your audio leaves your machine, passes through someone else's infrastructure, and comes back compressed. Hearably Studio takes a fundamentally different approach: every operation runs locally in your browser using the Web Audio API, your files never leave your device, and the output is completely clean — no watermarks, no quality degradation, no hidden limitations on file length or size.
The free audio editor online in Hearably Studio is not a stripped-down toy. The processing chain includes a volume boost up to 800% with a professional look-ahead limiter that prevents distortion at any gain level, a 10-band parametric EQ spanning 31 Hz to 16 kHz for precise tonal shaping, a 3-band multiband compressor with Linkwitz-Riley crossovers for dynamics control, and an AI-powered caption generator built on OpenAI Whisper that transcribes speech directly in the browser. Beyond basic enhancement, the Magic Cut feature automatically detects and removes silence and filler words — transforming raw recordings into tight, podcast-ready audio without manual editing. You can also export SRT subtitle files for any video content, making this a one-stop shop for creators who need both audio polish and accessibility features.
The technical foundation that makes this possible is the Web Audio API's OfflineAudioContext, which renders the entire DSP signal chain at CPU speed — far faster than real time. A 10-minute audio file processes in seconds on any modern laptop or desktop. Because the rendering happens locally in 32-bit floating-point precision (the same internal format used by professional DAWs like Logic Pro and Pro Tools), there is zero quality loss from server-side transcoding. Your MP3, WAV, FLAC, OGG, M4A, or AAC file is decoded to raw PCM samples, processed through the full chain, and re-encoded to your chosen output format entirely on your machine. The result is an audio file that sounds exactly as good as professional desktop software would produce — because it uses the same underlying math and precision.
For podcasters, this free audio editor online eliminates the need to install and learn Audacity or Adobe Audition just to clean up a recording. For content creators posting to YouTube, TikTok, or Instagram, the built-in AI caption generator and silence remover handle the most tedious parts of post-production. For musicians and voice-over artists, the parametric EQ and multiband compressor provide genuine studio-grade tonal control. And for anyone who simply needs to make a quiet file louder — a voice memo, a downloaded lecture, an old recording — the volume booster does it in seconds with zero distortion. All of this without installing software, without creating an account, and without spending a dollar. Free users get the full processing chain with WAV export. Pro users unlock MP3 export, batch processing, A/B preview comparison, and manual compressor parameter controls.
Privacy is not an afterthought — it is the architecture. Because Hearably Studio processes everything client-side, there is no server to hack, no database storing your audio files, and no third-party analytics running on your content. Your recordings of confidential meetings, unreleased music, private voice memos, and sensitive interviews never touch a network connection. You can verify this by disconnecting from the internet after the page loads — the entire tool continues to function perfectly offline. This makes Hearably Studio not just a free audio editor online, but arguably the most private audio editing tool available anywhere on the web.
Need the same fix elsewhere? See also Online Audio Equalizer, MP3 Volume Booster Online and Audio Mastering Online — Free Browser-Based Mastering Tool — all three use the same audio engine, tuned per platform.
How a Browser-Based Audio Editor Matches Desktop Software
The Web Audio API — supported natively in Chrome, Edge, Firefox, and Safari — provides the same fundamental audio processing primitives used in professional desktop audio software. At its core, the API works with 32-bit floating-point PCM samples, giving over 1,500 dB of theoretical dynamic headroom. This is identical to the internal bus precision of Logic Pro, Pro Tools, and Ableton Live. When you load a file into Hearably Studio, the browser's built-in decoders (which handle MP3, WAV, FLAC, OGG, AAC, and more) convert it to this float32 format, and all subsequent processing operates at this precision level.
The signal chain is constructed as a directed graph of AudioNode objects. The 10-band EQ uses BiquadFilterNode instances configured as peaking filters — second-order IIR filters computed using Robert Bristow-Johnson's Audio EQ Cookbook equations. These are mathematically identical to the filters in every major DAW. The multiband compressor splits the spectrum using cascaded Butterworth filters in a Linkwitz-Riley topology, guaranteeing flat magnitude response at the crossover points (250 Hz and 4 kHz). Each band receives independent dynamics processing, and the three bands sum back to a perfect reconstruction of the original signal plus the intentional gain changes.
The look-ahead limiter is implemented as a custom AudioWorkletNode — a real-time processing module that runs on a dedicated high-priority thread separate from the main browser thread. It maintains a 5-millisecond circular buffer, allowing it to detect peaks before they arrive at the output and compute smooth gain reduction envelopes. The worklet is engineered with zero heap allocations in its process() loop to avoid garbage collection pauses that would cause audio dropouts. For final export, the OfflineAudioContext renders the entire graph at maximum CPU speed, producing a complete AudioBuffer that is then encoded to WAV (or MP3 for Pro users via a client-side LAME encoder). No data leaves the browser at any point.
The AI caption system runs a quantized version of OpenAI Whisper compiled to WebAssembly (WASM) with SIMD acceleration. This means speech-to-text transcription happens entirely on your CPU — no audio is sent to OpenAI, Google, or any cloud API. The model achieves near-parity with cloud-hosted Whisper for clean speech, with particularly strong performance on English, Spanish, French, German, Portuguese, and Japanese. The resulting transcription feeds both the on-screen caption overlay and the SRT export pipeline, as well as the filler word detection used by Magic Cut.
How to get the best audio on Free Audio Editor Online
Boost quiet recordings without distortion
The most common use for any audio editor is making files louder. Hearably Studio applies gain through a professional look-ahead limiter that catches peaks 5 milliseconds before they clip. Start at 200% for moderately quiet files and increase gradually. Even at 800%, the limiter ensures zero digital distortion — something simple gain tools cannot guarantee.
Shape tone with the 10-band EQ before boosting
Boosting volume amplifies everything, including problems. If a recording sounds muddy, cut 250-500 Hz by 2-3 dB. If voices sound thin, add 2 dB at 2 kHz. Fixing tonal issues with EQ first means you need less raw gain to achieve perceived loudness, and the final result sounds cleaner and more professional.
Remove silence and dead air automatically
Magic Cut scans the entire audio file and removes passages below the silence threshold — typically pauses longer than 500 milliseconds. For podcasts, interviews, and lecture recordings, this can cut total duration by 10-30% without losing any spoken content. The cuts are crossfaded to prevent audible jumps.
Generate captions for accessibility and engagement
The built-in AI caption generator transcribes speech using Whisper, running entirely in your browser. Use this to add subtitles to video content for social media (captions increase engagement by up to 80% on TikTok and Instagram), or export as SRT files for YouTube and podcast platforms that support subtitle uploads.
Strip filler words for polished audio
Magic Cut detects and removes common filler words — "um," "uh," "like," "you know," "basically," "sort of" — using the Whisper transcription. This transforms rough interview recordings into clean, professional-sounding audio without hours of manual editing in a traditional DAW.
Process any common audio or video format
Hearably Studio accepts MP3, WAV, FLAC, OGG, AAC, M4A, MP4, WebM, and MOV files. Video files are supported — the audio track is extracted, processed, and remuxed with the original video stream untouched. You do not need a separate format converter.
Use offline after the page loads
Because all processing runs client-side, Hearably Studio works without an internet connection once the page has loaded. Open the tool, disconnect your Wi-Fi, and process files in complete privacy. This is ideal for editing confidential recordings, unreleased music, or sensitive interviews.
Export clean files — no watermarks ever
Free tier exports full-length WAV files with every processing feature applied. There are no audio watermarks, no duration limits, no quality degradation, and no "upgrade to remove watermark" prompts. The Pro tier adds MP3 export and batch processing, but the free output is completely clean and unrestricted.
Built for this exact use case
Volume Boost Up to 800%
Amplify any audio file up to 8x with a look-ahead limiter that catches peaks 5ms before they clip. Zero distortion at any boost level — dramatically louder audio with no artifacts.
10-Band EQ + Multiband Compressor
Professional parametric EQ from 31 Hz to 16 kHz plus a 3-band multiband compressor with Linkwitz-Riley crossovers. Shape tone and dynamics with studio-grade precision.
AI Captions + Magic Cut
Whisper-powered speech recognition generates captions in-browser. Magic Cut removes silence and filler words automatically. Export SRT subtitles or download tightened audio.
100% Private — No Uploads
Every operation runs locally via the Web Audio API. Your files never leave your device. No server processing, no cloud storage, no third-party access. Works fully offline.
Choose your method
Different situations call for different tools. Hearably gives you both.
Chrome Extension
Enhance audio live while you stream. The extension intercepts your tab's audio and processes it in real-time — volume boost, EQ, presets — without downloading anything.
- Streaming on Free Audio Editor Online, Netflix, Spotify
- Video calls on Zoom, Meet, Teams
- Any website with audio
- When you want instant, always-on enhancement
Free Online Studio
Upload an audio or video file, apply volume boost + 10-band EQ, preview in real-time, then download the enhanced WAV. Your file never leaves your browser.
- Downloaded videos or music files
- Podcast episodes you want to boost before sharing
- Voice recordings, lectures, interviews
- When you need a permanently enhanced file
Pro tip: Use a YouTube-to-MP3 tool to download the audio, then enhance it in Hearably Studio with EQ + volume boost. Perfect for offline listening, DJ sets, or sharing on social media.
Three clicks to better audio
Install
Add Hearably from the Chrome Web Store. Under 300KB, installs in seconds.
Enhance
Click the Hearably icon and tap "Enhance." Boost kicks in instantly.
Enjoy
Adjust volume, EQ, and presets. Works on any website with audio.
Frequently asked questions
Is this free audio editor online really completely free?
Yes. The full signal chain — volume boost up to 800%, 10-band parametric EQ, multiband compressor, look-ahead limiter, AI captions, Magic Cut silence and filler word removal, and WAV export — is entirely free with no account required. There are no watermarks, no duration limits, and no quality restrictions. Pro adds MP3 export, batch processing, A/B preview, and manual compressor controls.
Do my files get uploaded to a server?
No. All processing runs entirely in your browser using the Web Audio API and WebAssembly. Your audio files are decoded, processed, and re-encoded locally on your device. Nothing is transmitted to any server — not even for the AI caption feature, which runs a local Whisper model. You can disconnect from the internet after loading the page and it works identically.
What audio and video formats are supported?
Hearably Studio accepts MP3, WAV, FLAC, OGG, AAC, M4A, MP4, WebM, and MOV files. Video files are fully supported — the audio track is extracted, enhanced through the full DSP chain, and remuxed with the original video stream. The video quality remains bit-for-bit identical to the source.
How does the free audio editor online handle large files?
Because processing runs locally via OfflineAudioContext, there are no server-imposed file size or duration limits. A 2-hour podcast or a full-length album processes just as reliably as a 30-second clip. The only constraint is your device memory. A typical 60-minute recording at 44.1 kHz stereo requires approximately 600 MB of RAM for the decoded audio buffer.
Will boosting volume cause distortion or clipping?
No. Hearably Studio uses a look-ahead limiter that analyzes audio peaks 5 milliseconds before they reach the output. If any sample would exceed the safe ceiling of 0.95 (-0.45 dBFS), the limiter smoothly reduces gain over the look-ahead window. This prevents hard clipping entirely — you get louder audio with zero distortion, even at 800% boost.
How accurate are the AI-generated captions?
The caption generator uses a quantized OpenAI Whisper model running locally via WebAssembly. For clean speech recordings in supported languages (English, Spanish, French, German, Portuguese, Japanese, and others), accuracy is typically 90-98%. Background noise, heavy accents, and overlapping speakers reduce accuracy. You can manually correct the transcript before exporting SRT files.
Can I remove filler words and silence from a podcast?
Yes. Magic Cut combines the Whisper transcription with amplitude analysis to identify and remove both silence (configurable threshold) and filler words ("um," "uh," "like," "you know," "basically"). The cuts are crossfaded to prevent audible jumps, and the result is a tighter, more professional recording.
How does this compare to Audacity?
Audacity is a powerful desktop editor with more granular editing features (multi-track mixing, spectral editing, extensive plugin support). Hearably Studio is purpose-built for the most common audio editing tasks — volume boost, EQ, compression, caption generation, and silence removal — with a streamlined interface that requires zero installation and zero learning curve. For quick enhancement and cleanup jobs, it is significantly faster than opening and configuring a full desktop DAW.
Is there a limit on how many files I can process?
Free users can process unlimited files one at a time with no daily or monthly caps. Pro users additionally get batch processing to handle multiple files with identical settings in a single session. There are no file count restrictions on either tier.
Does the editor work on mobile devices?
Hearably Studio works on any device with a modern browser that supports the Web Audio API, including tablets and high-end smartphones. However, the best experience is on desktop or laptop browsers (Chrome or Edge recommended) due to the larger screen and faster processing speeds. Very long files may exceed available memory on mobile devices.