I built a free audio cutter, joiner and voice recorder that never uploads your audio
Every audio tool I tried wanted the same three things: my file uploaded to their server, an account, and then a watermark or a paywall at export time. So I built the opposite. Loona Audio Tools is a small free site with
Every audio tool I tried wanted the same three things: my file uploaded to their server, an account, and then a watermark or a paywall at export time. So I built the opposite.
Loona Audio Tools is a small free site with three tools that run entirely in the visitor's browser:
- Audio Cutter — load an MP3, WAV, M4A or OGG file, see its waveform, drag the start/end handles (or type exact times) and download the trimmed clip as WAV.
- Audio Joiner — drop in several audio files, reorder them, and merge them into one file.
- Voice Recorder — record from the microphone with a live timer and level meter, play it back, and download the take.
No file ever leaves the device. Decoding uses AudioContext.decodeAudioData, rendering uses an OfflineAudioContext, and the recorder uses MediaRecorder — the export is a hand-written WAV encoder, so there are no server costs and nothing to sign up for.
Why WAV for export?
Decoding gives you raw PCM. Re-encoding to MP3 in the browser would need a heavy encoder library; WAV keeps the build tiny and fast, and the output plays everywhere. The honest trade-off (large files for long clips) is stated on the pages themselves.
The same gap-closing round added more tools
This launch was part of a bigger "close the gaps" round across the Loona tool sites, all free and client-side:
- Loona Calculators gained a scientific calculator, an equation solver with step-by-step working (linear and quadratic, including complex roots), logarithm and trigonometry calculators, plus 24 dedicated unit-conversion pages like cm to inches and kg to pounds.
- Loona PDF Tools gained Organize PDF — reorder, rotate and delete pages with drag and drop.
- Loona Text Tools gained a sentence counter, reading time calculator and speaking time calculator (25 tools now).
- Loona Image Compressor gained an image watermark tool, a meme generator and a face blur tool — all on-device, of course.
Every calculation in the new calculator pages was verified with automated tests before publishing (the equation solver's steps include a back-substitution check), because a tools site lives or dies on being right.
If you try any of them, I'd love to hear what felt missing — the next gap round starts from real requests.
Originally published by Dev.to WebDev. Aggregated on AIWithGhost for educational purposes — full credit and traffic to the original publisher.