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Convert OPUS to MP3 Online Free

Exported a chat and got a pile of .opus files?

WhatsApp, Telegram and Discord record voice notes in Opus, a codec so efficient that a minute of speech takes about 100 KB. Most players, editors and transcription tools want MP3. Tick the notes you need; we'll convert them one by one or join them into a single file.

JMChat with Jo M.exported · 6 voice notesSelect all

check_circleplay_arrow0:42Mon 09:14

check_circleplay_arrow1:58Mon 09:20

radio_button_uncheckedplay_arrow0:15Mon 12:02

check_circleplay_arrow5:06Tue 18:45

radio_button_uncheckedplay_arrow1:07Tue 18:52

radio_button_uncheckedplay_arrow0:23Wed 08:03

3 voice notes · 7:46 total

library_musicSeparate MP3sone file per note, datedqueue_musicJoin into onein order, with chapters

MP3 bitrate

32small48clear64best for voice128music-grade

Opus932 KB1 MP33.7 MBgrowth×4

chapters in the MP3Mon 09:14 · Jo0:00Mon 09:20 · you0:42Tue 18:45 · Jo2:40

Mono 64 kbps: as clear as the voice note, and a size any service accepts.music_noteJoin 3 notes into one MP3

Open songs, voice memos or old archives and save them as MP3, AAC, FLAC, Opus, WMA, AC3, AMR or any of 19 more. Pick a quality preset or an exact bitrate, convert the whole batch in one pass, then download each file or one ZIP.

library_addAdd audio filesmusic_noteTry a sample track

lockFiles stay on your devicelibrary_music26 output formatsstacksBatch convert, one ZIPtunePresets or an exact bitrate

Your filesempty

upload_fileDrop audio files hereMP3, WAV, FLAC, M4A, OGG, OPUS, WMA, AIFF, AMR, AC3 and more. Add as many as you like; they convert one after another.

downloadclose

swap_horizConvert the sample to .mp3folder_zip

The FFmpeg engine (about 31 MB) downloads on your first conversion and runs on this device.

1Save as26 formats

.mp3.m4a.wav.flac.opus

searchAll 26 formatsexpand_more

. ·

.mp3MP3

MPEG-1 Audio Layer III, the universal standard. Best for music, podcasts and sharing.

Containermp3Encoderlibmp3lameMIME typeaudio/mpegFirst bytes49 44 33 or FF FBHerechecked when the engine loads

2Qualitylossy · smaller

Low96 kbps · 44.1 kHz · mono

Medium128 kbps · 44.1 kHz · stereo

High192 kbps · 48 kHz · stereo

Ultra320 kbps · 48 kHz · stereo

Customset it yourself

Bitrate

Bit depth

Sample rate

Channels

infoEach preset sets bitrate, sample rate and channels together. MP3 at 192 kbps is the usual choice for music.

3What you’ll getexample

a 3-minute stereo track3:00≈ 4.32 MB

The exact command each file goes throughffmpeg -i input.wav -vn -map_metadata 0 -ar 48000 -ac 2 -c:a libmp3lame -b:a 192k -f mp3 output.mp3

swap_horizConvert the sample to .mp3

~/why-the-mp3-is-bigger

MP3 needs about four times the bits to sound as clear.

Opus has a mode built for speech that works like a phone call, just much better. MP3 treats a voice like music and gets muddy when the bitrate is low. Slide the MP3 bitrate to see when it catches up with a 16 kbps voice note.

MP324 kbps

Opus voice note · 16 kbpsclear to 8 kHz

MP3 · 24 kbpsmuffled, smeared

0 Hz4 kHz8 kHz12 kHzBelow 48 kbps the MP3 cuts the high frequencies that make "s", "f" and "t" distinct, and adds a watery smear. Speech gets harder to follow.

~/filenames-tell-you

The filename says which app, and when.

Each app names and packages voice notes differently. We read the date from the name and write it into the MP3's tags, so notes sort correctly in any player. Some apps use .ogg for the very same Opus audio.

chatWhatsAppPTT-20260928-WA0014.opus

codecOpus 16 kbpschannelsmono · 16 kHz

PTT means push-to-talk. The date is in the name; the sequence number orders notes within a day.

sendTelegramaudio_2026-09-28_18-45-02.ogg

codecOpus 32 kbpschannelsmono · 48 kHz

Uses .ogg, but it’s the same Opus audio. The exact second of sending is in the name.

shieldSignalsignal-2026-09-28-184502.aac

codecAAC (not Opus)channelsmono · 44 kHz

Signal switched to AAC for voice notes. Upload these too; they convert the same way.

forumDiscord & othersvoice-message.ogg

codecOpus 64 kbpschannelsmono · 48 kHz

Higher bitrate than chat apps, so the MP3 can be a little larger for the same clarity.

~/what-people-do-next

Why someone needs the MP3.

Voice notes usually leave the chat for one of these reasons. Each needs slightly different settings, and we set them when you pick the use.

descriptionTranscription64 kbps · monoSpeech-to-text services accept MP3 almost universally. Mono at 64 kbps keeps every consonant and uploads fast.

podcastsPodcast or audio edit128 kbps · joinedJoined into one track with chapters, at a bitrate editors won’t complain about when you cut and re-export.

gavelEvidence or records64 kbps · separateOne MP3 per note, each keeping its original date and time in the tags. Nothing is merged or trimmed.

family_restroomKeepsake for family64 kbps · joinedA single file of a loved one’s messages in order, easy to play on any phone or burn to a CD.

~/other-routes

More for recorded voice.

Neighbouring tools, with a typical result for each.

graphic_eqAudio converterOther formats for the same notes: WAV for editing, M4A for Apple devices, FLAC for archiving.PTT-0014.opusarrow_forwardPTT-0014.wav compressAudio compressorLong notes joined into one? Shrink the MP3 to fit an email.chat.mp3 · 14 MBarrow_forward4 MB music_noteOGG to MP3Telegram and Discord .ogg files are handled there too, with music settings.audio.oggarrow_forwardaudio.mp3

Sources

[1]Opus codec (RFC 6716)Speech and music modes, bandwidths and bitrates.IETF ↗[2]Opus codec overviewHow Opus compares with MP3 and AAC.opus-codec.org ↗[3]MP3 ID3 tagsWhere dates and titles are stored in MP3 files.id3.org ↗

Frequently Asked Questions

Is converting OPUS to MP3 free?

Yes, OPUS to MP3 conversion is completely free with no signup, no watermark, and no usage limit. Convert as many files as you need.

Are my files uploaded to a server?

No. The OPUS to MP3 converter runs in your browser when your file is supported there, so the file stays on your device for that workflow, reducing server exposure for that workflow. If the file is sensitive, check the processing mode first.

How long does OPUS to MP3 conversion take?

Most OPUS to MP3 conversions finish in under a minute. Bigger files take longer, in proportion to their size. There is no queue to join and no account to make first.

Will the conversion reduce file quality?

Depends on what you are converting between. Go lossless to lossless and the picture or the audio comes out untouched. Go to a lossy format and you give up a little to get a smaller file.

Does this work on mobile devices?

Yes. The OPUS to MP3 converter works on phones, tablets, and desktops in any modern browser including Chrome, Safari, Firefox, and Edge.