Audio Equalizer
Ten bands from 32 Hz to 16 kHz, with presets and a spectrum view
100% In-Browser · Private & Instant · Free Forever
Your file is decoded, processed, and re-encoded in this browser tab. Nothing is uploaded to an OfflineTTS processing API.
Interactive Workspace
Audio Equalizer
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Adsterra privacyCarve a recording into shape with ten frequency bands spanning 32 Hz to 16 kHz. Each band cuts or boosts by up to 12 dB, and the spectrum display shows you where the energy in the file actually sits, so you can make a decision based on the material rather than on a guess.
What each region does:
- 32–64 Hz — sub weight, felt more than heard, often worth cutting on speech
- 125–250 Hz — body and warmth; too much here reads as boxy
- 500 Hz–1 kHz — the presence of the fundamental; small moves have large effects
- 2–4 kHz — intelligibility and attack; this is where a voice cuts through
- 8–16 kHz — air and sibilance; too much makes "s" sounds painful
How to work: make small moves. A 3 dB change across two or three bands is usually more effective than a 12 dB change on one, and it is far less likely to introduce a resonance. Use the preset as a starting point, then adjust by ear on a short excerpt.
Export: WAV for further work, MP3 for review. Decoding, processing, and encoding all run in this browser tab. The file you select is not uploaded, and the rendered audio is not stored on any server.
Supported Formats, File Limits & Local Privacy
Formats & Codecs
| Input formats | MP3, WAV, FLAC, OGG, Opus, M4A, AAC, plus MP4 & WebM audio tracks |
|---|---|
| Output formats | Uncompressed 16-bit PCM WAV; MP3 at 128, 192, or 320 kbps |
| Decoding path | Native browser AudioContext.decodeAudioData + offline Web Audio graph |
Size Limits & Privacy
- No server upload cap: files never leave your browser tab, so there is no remote file-size paywall.
- Memory ceiling: decoded audio is held in browser RAM as 32-bit float PCM (~10 MB per minute of 44.1 kHz stereo). Tracks under 30–45 minutes run reliably on standard laptops.
- Zero data retention: closing or refreshing the tab clears every audio buffer from memory immediately.
How This Compares to Cloud Audio Tools
Most browser-based audio utilities (such as 123apps or Clideo) upload your media to remote processing queues. Here is how OfflineTTS differs:
| Criterion | OfflineTTS (Audio Equalizer) | Typical Cloud Web Editors |
|---|---|---|
| File upload | None — decoded & rendered in your browser tab | Audio file uploaded to remote servers |
| Account / daily cap | No signup, no daily file quota, no watermarks | Often gated by daily file limits or paid tiers |
| Speed on large files | Instant start (no upload wait); bounded by device RAM | Upload + queue wait, then server-side CPU render |
| Works offline | Yes, once the page is loaded | Requires active network round trip |
How It Works
Load audio
Add the track or recording you want to shape.
Pick a preset
Start from Warm, Bright, Radio, or Lo-fi, or leave it flat.
Adjust the bands
Move individual bands by a few dB at a time and listen.
Render and export
Preview the curve, then download WAV or MP3.
Features
Ten Bands
Graphic EQ from 32 Hz to 16 kHz with ±12 dB on every band.
Spectrum View
See where the energy sits before deciding what to cut.
Five Presets
Flat, Warm, Bright, Radio, and Lo-fi starting points.
Output Trim
Compensate for level changes introduced by the curve.
Reading the Spectrum Before Touching a Band
The most common equalizer mistake is applying a corrective curve before listening to the problem. A track that sounds dull may actually have plenty of high-frequency content that is being masked by excessive low-mid energy; cutting the low-mids fixes it, while boosting the highs just adds hiss.
Use the spectrum view to check what is actually present. If there is energy below 60 Hz in a spoken-word recording, that is rumble and the high-pass end of the curve is the right place to deal with it. If the 300–500 Hz region is consistently the loudest part of the spectrum, that is the boxiness that makes a voice sound as if it were recorded in a wardrobe.
Small Moves, Repeated Listening, and Export
Ear fatigue sets in within a few minutes of focused listening, and it makes bright curves sound better than they are. A practical technique is to make a change, listen for thirty seconds, then switch back to the original. If the difference is not clearly an improvement, the change was too large or unnecessary.
Equalization also interacts with level. Boosting three bands by 4 dB raises the overall output, which the ear reads as "better" even when the tonal change is neutral. Match levels before comparing, or use the output trim to compensate, so you are judging tone rather than volume.
Every effect here is deterministic: the same file and the same control values produce the same output. That means you can reproduce a result later, but it also means the tool will not guess what you intended — check a short excerpt before rendering a long file, and keep the original.
Related Tools
Volume Booster
Make a quiet recording louder and normalise inconsistent levels
Add Reverb to Audio
Place a dry recording in a room, hall, plate, or cathedral
Bass Booster
Add low-end weight with a shelf and a mud cut, not a blunt volume bump
Audio Noise Remover
Learn the noise floor of a recording, then gate it out band by band
Audio Equalizer — FAQ
What is the difference between a graphic and a parametric EQ?
A graphic EQ gives you a fixed set of bands at set frequencies, which is fast and predictable. A parametric EQ lets you choose the frequency, gain, and bandwidth of each band, which is more flexible but slower. This tool is graphic with an adjustable curve — ten fixed frequencies, continuous gain.
How much should I boost or cut?
Start at 3 dB. Small broad changes sound natural; large narrow changes sound like a filter. If you need more than about 6 dB in one place, that usually means the problem is elsewhere — the recording may need a different microphone position rather than more EQ.
What does the 2–4 kHz region do?
That is where speech intelligibility lives. A gentle lift there makes a voice cut through a mix. Too much produces a harsh, fatiguing sound, and consonants become edgy. It is the most sensitive region of the range for vocal work.
Can EQ remove background noise?
Only if the noise is confined to a narrow band — a 50 Hz mains hum, for example, which the rumble filter can reduce. Broadband noise such as hiss or air conditioning covers the same frequencies as the content, so filtering it also removes part of what you want to keep. Use the noise remover for that.
Does the equalizer work on video files?
Yes. Video containers such as MP4 and WebM are decoded by the browser and processed as audio, so you can export the equalised audio track on its own.
Technical Standards & Upstream References
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