Remove noise & compress audio/video — 100% in your browser, no upload, free.

Sondra is a free, browser-based tool that lets you remove background

noise from audio and video files (fan hum, AC, room echo) and compress

them for sharing — without uploading anything to a server.

Most online media editors upload your file to a cloud, queue it for

processing, then return the result. Sondra does the entire pipeline

locally using FFmpeg compiled to WebAssembly. Your files never leave

your browser tab. There's no signup, no watermark, no time limit, no

account, no upsell.

I built this because every "free" online noise remover and video

compressor I tried either watermarked the output, made me wait in a

queue, or used my recordings to train their AI. As a podcaster/creator,

that's a non-starter — those recordings are often confidential client

calls, unreleased music, or personal moments.

Sondra is built for:

- Podcasters cleaning room noise from home recordings

- YouTubers/TikTokers compressing video before upload

- Remote workers cleaning Zoom recordings before sending to clients

- Freelancers shipping smaller video files to clients

- Anyone who needs to clean or compress without trusting a third-party server

The tool currently supports MP3, WAV, AAC, FLAC, OGG audio (up to 500MB

on desktop, 100MB mobile) and MP4, MOV, MKV, WebM, AVI video. Output

formats include modern codecs like Opus and H.265 for smaller file sizes

at the same quality.

Localized in 13 languages (EN, DE, FR, VI, ES, JA, PT, KO, IT, HI, TR,

AR, TH) so it works for creators worldwide, not just English speakers.

Currently 100% free. Long-term plan: a free desktop app (Tauri-based)

for users with files larger than 500MB, with a small Pro tier for batch

processing — but the browser version stays free forever.