Audacity
- Post-production
- Win · Mac · Linux
- Free tier
Free forever, manual by design. Strong on steady hiss.
| Platforms | Windows, macOS, Linux |
|---|---|
| Price | Free — open source (GPL) |
| Free tier | Everything; no accounts, limits or watermarks |
| Direction | Recordings only — destructive edit on files |
| Mechanism | Spectral — two-pass noise-profile subtraction |
| Founded / status | 2000 · very active — 3.7.8 shipped Jun 29, 2026; v4 in beta |
| Data processing | Local — open-source code, offline processing; files never leave your disk |
| Best for | Anyone who wants free, private cleanup and doesn't mind doing the work by hand |
Every figure above was checked against vendor pages — pricing, help center, release notes — on the printed date. Tables are re-verified quarterly; a tool that dies between passes is removed from the index, not annotated.
In one paragraph
Audacity's noise reduction is the manual method: select a few seconds of room tone, build a noise profile, apply subtraction across the file. It costs nothing, runs offline on all three desktop OSes, and handles steady offenders — hiss, hum, fan, air-con — well. Changing noise defeats it, and over-cranking the sliders produces the underwater artifacts every podcaster gets to make exactly once. Development is brisk again under Muse Group. Keep reduction under ~12 dB and most artifacts never appear. Best at: free, private, fully-controlled cleanup.
Strengths
- Free, open source and offline — no account, ever
- Precise control over exactly how much reduction is applied
- One of only two Linux options in this entire index
Limitations
- The two-pass profile workflow is manual, every time
- Variable noise defeats it — voices, traffic, keyboard clatter
- Over-cranked sliders produce the classic underwater artifacts
Best alternative
Mini-FAQ
Is Audacity free?
Completely and permanently — Audacity is GPL open source with no account, no limit, no watermark and no premium tier hiding features behind a toggle. Verified Jul 29, 2026 against version 3.7.8, released June 29, 2026, with v4 in public beta.
Is Audacity safe to use?
As private as this category gets: open-source code, offline processing, files sitting on your own disk. Nothing uploads anywhere, and the noise reduction works with the network cable unplugged.