Free Online Audio Converter
A free online audio converter for MP3, WAV, M4A, AAC and more — fast, secure, watermark-free.
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An audio converter re-encodes sound files between formats — extracting MP3 from a video, turning WAV masters into shareable files, or rescuing old WMA libraries. Filevo handles 8 audio formats with bitrate control, entirely in your browser. Free, no signup, no watermarks. Everything below — format face-offs, size math, troubleshooting — comes from how the converter actually works, not generic advice.
Popular audio conversions
What is an audio converter?
Audio conversion decodes the sound waves stored in one format and re-encodes them in another. Lossless-to-lossless conversions are mathematically perfect; conversions involving lossy formats trade a controlled amount of inaudible detail for much smaller files — the bitrate setting controls that trade.
How to use this audio converter
- Drag your audio file into the converter above, or click "Browse Files" to pick one from your device (up to 200 MB on the free tier).
- Choose a target format in the picker — match it to the job using the format guide above: compatibility, quality, or size.
- Hit "Convert". The cloud engine processes the file automatically with live progress.
- Download the result. Your original is already deleted, and the output auto-deletes after 24 hours.
Which audio format should you use?
Every format has a home turf. Click a format to see every conversion it supports:
| MP3 | Lossy compression | music, podcasts, audiobooks, car stereos |
| WAV | Lossless compression | studio recording, audio editing, broadcast |
| M4A | Lossy compression | iPhone voice memos, Apple Music files |
| AAC | Lossy compression | streaming audio, YouTube, mobile devices |
| FLAC | Lossless compression | music archiving, hi-fi audio collections |
| OGG | Lossy compression | game audio assets, open-source projects |
| Opus | Lossy compression | voice messages, VoIP, low-bitrate streaming |
| WMA | Lossy compression | legacy Windows audio files |
Format face-offs
MP3 vs AAC (M4A) vs Opus
All three are lossy, and the difference is efficiency per kilobit. MP3 is the compatibility king — every device since the 90s plays it. AAC (usually in an M4A container) sounds noticeably better than MP3 at the same bitrate and is the Apple/YouTube standard. Opus beats both and shines at low bitrates, which is why voice apps use it — but car stereos and older players often refuse it. Pick MP3 to be safe, AAC for Apple-centric listening, Opus for voice and bandwidth-critical uses.
FLAC vs WAV
Both are lossless and sound identical. WAV is uncompressed raw PCM — the studio standard, instantly editable, but huge (about 10 MB per minute). FLAC compresses the same data to roughly half the size with bit-perfect reconstruction, and carries proper tags. Archive and listen in FLAC; deliver WAV when an editor, DAW, or broadcast workflow asks for it.
What bitrate can you actually hear?
Blind listening tests consistently show: speech is transparent at 128 kbps, and the vast majority of listeners cannot tell 192 kbps music from the original on normal equipment. 320 kbps is the format ceiling — choose it for archiving or critical listening on good headphones, not because everyday playback needs it.
OGG vs Opus — the open-source siblings
Both come from Xiph.Org and both are royalty-free, but they are a generation apart. OGG (Vorbis) is the 2000s codec that game engines standardized on; Opus is its 2012 successor that wins every quality-per-kilobit benchmark since. New projects should reach for Opus — unless a tool, engine, or pipeline specifically asks for OGG.
Common audio conversion tasks, solved
- →Extract the audio from a video
MP4 to MP3 pulls the soundtrack out of any video — podcasts, lectures, music sessions — into a small file you can listen to anywhere.
- →Share an iPhone voice memo
Voice memos are M4A. Convert to MP3 at 128 kbps and they play on any device, at half the size.
- →Archive your music losslessly
Convert WAV masters or rips to FLAC: bit-perfect quality at roughly half the storage, with proper tags.
- →Prepare audio for a game engine
Unity and Unreal load OGG natively with small footprints — convert your WAV assets before import.
- →Slim an audiobook or lecture
Speech stays perfectly clear at 128 kbps MP3 — hours of audio in a pocket-sized file.
What to expect: sizes & speed
Size math per minute of audio: uncompressed WAV runs about 10 MB; FLAC roughly halves that to ~5 MB; MP3 lands at 2.4 MB (320 kbps), 1.4 MB (192 kbps), or 0.96 MB (128 kbps); Opus voice can drop under 0.5 MB. A one-hour lecture is ~600 MB as WAV but under 60 MB as 128 kbps MP3 — same intelligibility.
One honest physics note: converting lossy to lossless (MP3 to FLAC) makes the file bigger without making it better — detail the MP3 discarded is gone. Convert lossy to lossless only when a tool insists on the format.
Audio converter settings explained
Bitrate is the one setting that matters: 128 kbps is transparent for speech, 192 kbps (the default) is the sweet spot for music, and 320 kbps is the ceiling for critical listening. Per minute of audio that is roughly 0.96 MB, 1.4 MB, and 2.4 MB respectively.
Going lossless? FLAC stores a bit-perfect copy at about half of WAV size. Going small? Opus beats every other codec per kilobit. And remember: converting lossy to lossless cannot restore detail that was already discarded.
Troubleshooting
The converted file has no sound
The source track may use an exotic codec our decoder flagged — the error message will say so. Try playing the original locally first; if it is silent there too, the recording itself is the problem.
Volume sounds lower than the original
Conversion never changes loudness — players do. Check the player’s replay-gain or normalization setting before suspecting the file.
Album art disappeared
Core tags (title, artist, album) carry over; embedded cover art depends on the target format and does not always survive. Keep the original if artwork matters.
A "lossless" FLAC from an MP3 sounds the same
Correct — and it always will. FLAC faithfully preserves what the MP3 contained, including what the MP3 already discarded. Lossless conversion protects quality; it cannot create it.
Audio converter FAQ
Is Filevo's audio converter free?
Yes — 10 free conversions a day with files up to 200 MB, no signup and no watermarks. A free account raises that to 20 a day and 500 MB.
Are my files safe?
Everything is TLS-encrypted, conversion is fully automated with no human access, originals are deleted right after conversion, and results auto-delete after 24 hours (or sooner if you delete them manually). Your files are never used for AI training or shared with anyone.
Do I need to install anything?
No. Everything runs in your browser and works the same on phones, tablets, and computers — even older devices stay fast, because the heavy lifting happens in the cloud.
How do I pick the right target format?
Match it to the job: maximum compatibility calls for the universal formats (JPG for images, MP3 for audio, MP4 for video); maximum quality calls for lossless (PNG, FLAC, WAV); minimum size calls for the modern codecs (WebP, AVIF, Opus). The table above summarizes what each format is for.
Are audio tags (title, artist) preserved?
Core tags — title, artist, album — carry over whenever the target format supports them; extras like embedded cover art vary by format.
Can I convert several files at once?
You can run multiple conversions in parallel — they process independently. Batch upload with zip download is coming soon.
Does quality degrade every time I convert?
Between lossless formats (WAV↔FLAC, PNG↔TIFF) — never. When lossy formats are involved, each re-encode adds a small generational loss. The right habit: keep your original and convert from it whenever you need a new format, instead of chaining conversions.
What happens if a conversion fails?
Failed conversions never count against your quota, and the error message explains the cause in plain language (corrupted file, unsupported codec, and so on). Your uploaded original is deleted immediately either way.