Is Sondra really free?

Yes. Every tool is completely free, with no subscription, no credits, no signup and no watermark.

What can I do with Sondra?

Sondra is a full toolkit for audio and video. You can convert between formats, compress files, remove background noise, boost the volume, trim and cut, merge clips, rotate and flip, crop and resize, change the speed, mute a video, and turn a clip into a GIF. New tools are added regularly.

Is my file uploaded to a server?

No. Every tool runs directly in your browser using WebAssembly, so your files never leave your device and nothing is uploaded.

What file formats are supported?

Video: MP4, MOV, MKV, WEBM and AVI. Audio: MP3, WAV, AAC, FLAC, M4A and OGG. You can also export an animated GIF from a video.

What is the maximum file size?

Up to 500MB on desktop and 100MB on mobile browsers.

Do I need to install anything?

No. Sondra runs entirely in your browser on desktop and mobile. There is nothing to download or install, and no account to create.

Free Online Audio & Video Tools, Right in Your Browser

Remove noise, compress, and convert audio and video. Free, instant, and completely private. Pick a tool below to start.

Convert & Extract

Video to AudioExtract the audio track from any video. MP4 to MP3 and more.Audio ConverterConvert between MP3, WAV, AAC and FLAC.Video ConverterConvert video between MP4, MOV and MKV.Video to GIFTurn a video clip into an animated GIF.GIF to MP4Turn an animated GIF into an MP4.Audio to VideoTurn audio into a video with a cover.

Compress & Clean Up

Compress VideoReduce video file size in your browser. Fast, free, private.Compress AudioShrink MP3, WAV, AAC files. Free, private, instant.Remove Video NoiseClean up background noise from video recordings.Remove Audio NoiseClean up hiss, hum, and fan noise from recordings.Volume BoosterMake a quiet video or audio louder.NewVocal RemoverRemove vocals to make a karaoke track.NewRemove SilenceCut silent gaps from audio.

Trim & Edit

Video TrimmerCut and trim video to the part you want.MP3 CutterCut MP3 and audio, and make ringtones.Rotate VideoRotate or flip a video.Crop VideoCrop and resize to any aspect ratio.Mute VideoRemove the audio track from any video.NewReverse VideoPlay a video clip backwards.

Merge & Speed

Merge VideoJoin several clips into one video.Merge AudioJoin several audio files into one.Add Audio to VideoAdd music or replace a video's audio.Video SpeedSlow down or speed up video.Audio SpeedSlow down or speed up audio.NewLoop VideoRepeat a clip into one seamless MP4.

No Signup RequiredStays on Your DeviceFree to Use

0Free tools

0+formats supported

0files leave your device

What creators say

“I record in my living room. Before Sondra, every episode had fan noise. Now it sounds like I have a studio.”

— Alex M., Podcast Host

“Compressed a 400MB iPhone video to 60MB in under a minute. Uploaded to YouTube immediately. No quality difference I could see.”

— Sophie T., YouTube Creator

“Cleaned up a 45-minute Zoom recording before sending to a client. They asked what mic I was using.”

— Marcus R., Freelance Consultant

100% Private

Your files never leave your device.

No Upload to Server

Everything runs in your browser.

Free to Start

No account needed to try.

Hear the difference

Press play to hear our noise remover at work. Every Sondra tool runs the same way: instantly in your browser, with nothing ever uploaded.

Before

Background noise: fan, room echo

After

Clean voice, no noise, ready to publish

How It Works

1. Pick a tool

Choose what you need from the tools above, then drop in your audio or video file. Up to 500MB.

2. Process in your browser

Sondra does the work right on your device. Nothing is uploaded to a server.

3. Download

Your file is ready in seconds. No account, no watermark, no waiting.

Why Sondra?

Browser-based processingServer-based tools

Files stay on your device Files uploaded to cloud

No waiting in queue Server processing time

Works offline after load Requires internet

Free to start, no signup required Free tier with limits

Whatever you make, the right tools keep your files clean, light, and in the format you need. Sondra is built for people who create, and everything runs free, right in your browser.

Podcasters

Record anywhere, clean it up here. Remove room noise and compress your episode before uploading to Spotify, Apple Podcasts, or your host. No studio required.

Clean my podcast →

Content Creators

Shooting on your phone means large files. Compress your videos before posting to YouTube, TikTok, or Instagram, without re-recording or losing quality.

Compress my video →

Musicians & producers

Convert tracks between MP3, WAV, AAC and FLAC so they play in any app, player or DAW. Keep it lossless when it matters, or make it small when it does not.

Convert my audio →

Video editors

Convert clips between MP4, MOV and MKV, or pull a clean audio track out of any video for a voiceover or transcript.

Convert my video →