ToolStudio.es
14 tools

Online audio tools

ToolStudio’s audio tools trim and merge MP3 and WAV files, change the speed or pitch, equalize and boost the bass, create 8D, slowed + reverb, nightcore or 432 Hz versions, record your voice and transcribe audio to text with AI. Everything works in your browser, without uploading the files.

All tools

Audio

Audio Trimmer

Trim MP3, WAV, M4A and more right on the waveform, with fade in and fade out. Everything runs in your browser, no upload needed.

MP3WAVM4ACut
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Audio

Audio Speed Changer

Change the speed of an MP3 or WAV from 0.25× to 3×, keeping the pitch or changing it along with the tempo. Processed in your browser.

MP3TempoBPM
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Audio

Audio Pitch Shifter

Transpose any audio up to 12 semitones up or down, with fine-tuning in cents. The length stays the same. Everything runs in your browser.

MP3PitchKey
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Audio

Audio Equalizer

EQ any audio online with 10 bands and presets (vocal, podcast, rock, pop, electronic). No clipping, and no file upload.

EQMP3WAV
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Audio

Bass Booster

Boost the bass of an MP3 or WAV by up to +18 dB and choose the cutoff frequency. The volume adjusts automatically so it never clips.

BassMP3
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Audio

8D Audio Converter

Convert any song to 8D audio: the sound moves from one ear to the other with room ambience. Choose how fast it rotates. Best with headphones.

8DMP3Stereo
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Audio

Slowed + Reverb

Make a slowed + reverb version of any song: slower, deeper and wrapped in lush echo. Adjust the speed, reverb and room size.

SlowedReverbMP3
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Audio

Nightcore Maker

Turn a song into nightcore by raising the speed and pitch together, with optional bass boost. Download as MP3 or WAV.

NightcoreMP3
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Audio

432 Hz Converter

Convert music tuned to 440 Hz to 432 Hz by lowering the pitch 31.8 cents, without changing the length or tempo. Processed in your browser.

432 Hz440 HzMP3
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Audio

Reverse Audio

Reverse an MP3, WAV or voice memo so it plays backwards. Download the reversed audio as MP3 or WAV.

ReverseMP3WAV
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Audio

Audio Merger

Merge MP3, WAV, M4A and other audio files in any order, with silence or a crossfade between them. Download a single file.

MP3WAVJoin
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Audio

Voice Recorder

Online voice recorder: record from your microphone with pause and a level meter, play back the take and download it as MP3 or WAV. Nothing to install.

MicMP3WAV
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Audio

Audio Transcriber

Transcribe audio, voice notes, interviews and videos to text with Whisper. Detects the language and adds punctuation and timestamps. No upload needed.

MP3TXTAIWhisper
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Video

Video Converter

Convert videos between MP4, MOV, WebM and MKV, or extract the audio as MP3, M4A, WAV or OGG. Lossless when the codec is compatible, with no upload.

MP4MOVWebMMKV
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Which audio tool to choose

To edit a recording, Trim audio removes the start, the end or a section, and Merge audio joins several files into one with fades. To make a voice or a podcast sound better, use the equalizer and its presets.

For song versions there are ready-made effects: 8D, slowed + reverb, nightcore, bass booster or 432 Hz. And if you need the text of an interview or a voice note, Transcribe audio produces it with timestamps.

What each tool does

ToolWhat it is forFormats
Audio TrimmerCut the start, the end or any section of a song or recording.MP3 → MP3
Audio Speed ChangerSpeed up or slow down audio without changing how the voice sounds.MP3, Tempo, BPM
Audio Pitch ShifterRaise or lower the key of a song by semitones without changing its length.MP3, Pitch, Key
Audio EqualizerAdjust bass, mids and treble with a 10-band equalizer.EQ, MP3, WAV
Bass BoosterMore bass and more punch for any song, without distortion.Bass, MP3
8D Audio ConverterMake music spin around your head.8D, MP3, Stereo
Slowed + ReverbSlowed-down, echo-drenched versions of any song in one click.Slowed, Reverb, MP3
Nightcore MakerFaster and higher: the nightcore version of any song.Nightcore, MP3
432 Hz ConverterRetune any song from 440 Hz to 432 Hz.440 Hz → 432 Hz
Reverse AudioPlay any audio backwards and download it.Reverse, MP3, WAV
Audio MergerCombine several songs or recordings into a single file.MP3 + MP3 → MP3
Voice RecorderRecord your voice in the browser and download it as MP3 or WAV.Mic → MP3
Audio TranscriberTurn audio and video into text with AI.MP3 → TXT
Video ConverterChange the format of your videos or extract the audio.MOV → MP4

Frequently Asked Questions

Which audio formats are supported?

The tools accept the most common audio formats, such as MP3, WAV and M4A, and download the result as MP3 or WAV.

Are my audio files uploaded to a server?

No. The effects, trimming, merging and transcription are processed in your browser, so the file never leaves your device.

Does changing the speed change the pitch of the voice?

Not with Change speed: it speeds up or slows down from 0.25× to 3× while keeping the pitch. If you want to change the pitch without changing the speed, use Change pitch.

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