// about

About MyFreeAudioTool

Hi — I'm Rob Sawant, an engineer and project manager, and I build this site (along with its four siblings) in my spare time. It started the way most side projects do: with mild irritation. I needed to trim one audio clip, and every "free" tool I tried wanted to upload my file to a server, stamp a watermark on the export, or hide the actual feature behind a signup wall. None of that is necessary. So I built the tool I wanted — and then thirty more.

The mission

The same promise holds across all five of my apps: genuinely free, no accounts, no watermarks, and privacy by architecture. That last part is the one I care about most. Your recordings, voice memos and music are processed entirely in your browser using the Web Audio API and WebAssembly — there is no upload step, no server that ever receives a file, nothing for me to see or store even if I wanted to. It's not a privacy policy, it's a privacy architecture: the data path to my servers simply doesn't exist. As a bonus, skipping the upload makes everything dramatically faster too.

What's here

MyFreeAudioTool is thirty-one focused audio utilities plus a full multitrack studio — editing (trim, merge, silence removal, tagging), conversion, effects (EQ, reverb, vocal removal, noise reduction, 8D and 3D spatial audio, slowed + reverb), generators (test tones, noise colors, metronome) and analysis (BPM/key, chromatic tuner, spectrogram, waveform art). Each page does one job well, on desktop and mobile, with nothing to install.

The suite

This site is one of five built on the same no-upload principle: MyFreePDFEdit for PDF work, MyFreeImageTool for image editing, conversion and OCR, MyFreeAudioTool (you're here), MyFreeVideoTool for video editing, and MyFreeInvoiceTool for invoices and billing documents. Different file types, identical deal: free, private, on-device.

The technology

The tools are built on the Web Audio API for decoding, editing, filtering and rendering; FFmpeg compiled to WebAssembly for format conversion, compression and extraction; the LAME encoder (also WebAssembly) for MP3 export; the MediaRecorder API for recording; and hand-rolled DSP (FFT, autocorrelation, granular synthesis) for analysis and pitch shifting. All of it runs in your browser tab and is gone when you close it.

Get in touch

Questions, bugs, ideas for tool number thirty-two? Email me at sawantrob [at] gmail [dot] com — I read everything, usually within a day or two. The contact page lists the details that help me fix problems fastest.