# Audio Loudness Normalizer Online Measure integrated loudness and normalize your tracks to -14, -16, or -23 LUFS. Runs entirely in your browser with no upload, no account. HTML: https://grepcut.com/en/tools/audio-normalizer ## How to Normalize Audio Loudness Online 1. **Upload your audio**: Drop an MP3, WAV, M4A, or OGG file into the upload card. 2. **Choose your LUFS target**: Pick Streaming at -14 LUFS, Podcast at -16 LUFS, or Broadcast at -23 LUFS. 3. **Normalize and export WAV**: Click Normalize to measure loudness, apply safe gain with peak limiting, and download a WAV copy. Your file is processed locally in your browser. Nothing is uploaded to GrepCut. ## Why Your Audio Needs LUFS, Not Just Peak Normalization If your clip peaks near 0 dB but still sounds quiet next to other audio, peak normalization will not solve the real problem. Peaks only show the loudest sample, while LUFS estimates how loud your track feels over time. GrepCut measures integrated loudness with K-weighting, then applies gain toward your selected target while respecting a -1 dBTP peak ceiling. That helps your audio land closer to a streaming, podcast, or broadcast loudness target without pushing peaks into clipping. ### Use this when you want consistent perceived loudness before sharing, publishing, or editing further. If your file is already very loud and has no headroom left, the peak ceiling may prevent the tool from reaching the exact LUFS target. In that case, the safer result is usually better than a clipped result. ## Which LUFS Target Should You Choose? | Target | Best for | What it does | | --- | --- | --- | | -14 LUFS | Streaming video or music previews | A common loudness target when you want audio to sit closer to major streaming playback levels. | | -16 LUFS | Podcasts and spoken-word clips | A practical target for voice-first content where clarity and consistency matter more than maximum loudness. | | -23 LUFS | Broadcast-style delivery | A quieter target aligned with EBU R128-style broadcast loudness workflows. | These presets are starting points. Your final delivery platform may apply its own playback normalization after you publish. ## What Happens Inside Your Browser When you add a file, your browser decodes the audio so GrepCut can analyze the waveform. The tool measures loudness across the full track, calculates the gain needed for your selected LUFS target, and limits the result so peaks stay under the ceiling. Because the processing is local, your audio stays on your device. Very long files can take longer because your browser has to decode and process the audio in memory. - **Private by design**: Your source audio is not uploaded to a server. - **LUFS-aware**: The tool targets perceived loudness, not only the highest sample peak. - **WAV export**: The normalized result downloads as a WAV file for editing, archiving, or conversion. ## When Loudness Normalization Helps Most Use LUFS normalization when your voice memo, podcast segment, screen recording, or music clip sounds much quieter or louder than the rest of your project. It is especially useful before you assemble several clips into one timeline. For voice, you may still want to clean noise, EQ, compress, or edit pauses before normalization. Loudness normalization is usually the final level-matching step, not a substitute for fixing a noisy recording or an uneven performance. ## Audio Normalizer Pros and Limits ### Advantages - You can normalize MP3, WAV, M4A, or OGG without uploading your file. - You can choose clear LUFS presets for streaming, podcast, or broadcast workflows. - Peak limiting reduces clipping risk when gain is added. ### Disadvantages - The export format is WAV, not MP3 or M4A. - A file with no remaining headroom may not reach the exact LUFS target without clipping. - Browser decoding support can vary by file codec and device. > Normalization adjusts every song to the same peak level, but that's not the same thing as adjusting them to the same loudness level. > > Reddit r/audioengineering ## Audio Normalizer FAQ ### Can you normalize audio to -14 LUFS online? Yes. Choose the Streaming preset to target -14 LUFS, then export the normalized result as WAV. Your browser does the processing locally, so your file is not uploaded. ### Should you use -14 LUFS or -16 LUFS? Use -14 LUFS when you want a common streaming-style target. Use -16 LUFS when you are preparing spoken-word audio such as a podcast segment. If you are unsure, choose the preset that matches where your audio will be used. ### Can you normalize audio for broadcast loudness? Yes. Choose the Broadcast preset to target -23 LUFS. This is useful when you want a quieter broadcast-style loudness target instead of a streaming or podcast target. ### Will your audio file be uploaded? No. GrepCut processes your audio in your browser. The source file stays on your device, and the normalized WAV is generated locally. ### Will loudness normalization distort your audio? The tool applies gain with a -1 dBTP peak ceiling to reduce clipping risk. If your source is already very loud, the limiter may prevent the exact LUFS target so the export stays safer. ### Why does your file still sound different after matching LUFS? LUFS is a strong loudness guide, but tone, bass, compression, background noise, and dynamic range still affect how loud your audio feels. Two files can share a LUFS value and still feel different. ### Can you export MP3 after normalization? This tool exports WAV. If you need another delivery format, normalize first, then convert the WAV with a separate converter. ## Sources & further reading - [Reddit discussion about podcast loudness normalization](https://www.reddit.com/r/podcasts/comments/f1fbew/editing_question_do_you_normalize_and_if_so_how/) - [Reddit discussion on peak normalization versus perceived loudness](https://www.reddit.com/r/audioengineering/comments/kctip9/normalising_the_volume_of_100_tracks_at_once/) - [Spotify guide to loudness normalization](https://support.spotify.com/us/artists/article/loudness-normalization/) - [ITU-R BS.1770-5 loudness and true-peak recommendation](https://www.itu.int/dms_pubrec/itu-r/rec/bs/R-REC-BS.1770-5-202311-I!!PDF-E.pdf) - [MDN Web Audio API overview](https://developer.mozilla.org/en-US/docs/Web/API/Web_Audio_API) - [MDN decodeAudioData browser audio decoding reference](https://developer.mozilla.org/en-US/docs/Web/API/BaseAudioContext/decodeAudioData) ## Normalize Your Audio Privately Open the Audio Normalizer, choose your LUFS target, and export a clean WAV without sending your file to a server. ## Related Tools - [Audio Noise Remover](https://grepcut.com/en/tools/audio-noise-remover) - clean background noise before normalizing loudness. - [Ringtone Maker](https://grepcut.com/en/tools/ringtone-maker) - cut a short clip and export an M4R or MP3 ringtone.