Convert Audio and Video Files to MP3
A WAV that is too big to email. An M4A voice memo a car stereo will not play. A video where you only want the sound. Upload the file here and download it as an MP3, the audio format every phone, player and podcast host takes.
Before you go further: downloading the MP3 is on paid plans. If the file is all you need, a free converter gets you there faster, and I name two below.
What ScreenApp adds is the transcript. The file stays in your library with every word written out, so you can search it, quote it or ask the AI about it before you download anything.
An MP3 of the audio
Downloaded with the Download Audio button on the file, with no watermark on any recording or export.
A transcript
In 100+ languages, exportable as PDF, DOCX, TXT, SRT and VTT.
Questions answered
AI chat with any recording, so you can check a long recording without playing it back.
Big files and batches
Up to 2 GB in the tool on this page, and bulk upload of multiple files in the app.
Why Convert to MP3 at All?
Size, mostly. CD-quality WAV runs at about 1,411 kbps, so an hour of it is roughly 635 MB. The same hour as a 128 kbps MP3 is about 58 MB. That is the difference between a file you can email and one you cannot.
The cost is detail. MP3 throws away sound it predicts you will not notice. On a voice, a podcast or a lecture you will not. On a master you plan to edit again, you might, so keep the original.
And it does not work backwards. Converting an MP3 to WAV makes a bigger file with exactly the same sound, because the detail is already gone.
Where These Files Come From
| Format | Where it usually comes from | Why people convert it |
|---|---|---|
| WAV and AIFF | Field recorders, audio interfaces, GarageBand and Logic exports | Far too big to share or upload |
| M4A | iPhone Voice Memos, Zoom audio-only recordings | Some players, car stereos and older apps skip it |
| FLAC | Lossless music downloads and CD rips | Phones and players without FLAC support |
| OPUS and OGG | WhatsApp and Telegram voice notes | Most editors and players do not open them |
| AMR | Older phone call and voice recorders | Many players and editors do not open it |
| WMA | Old Windows Media files | Macs and phones do not play it |
| MP4, MOV and other video | Phone videos, screen recordings, downloads | You only want the sound |
Audio uploads take MP3, M4A, MP4A, M4B, AAC, WAV, OGG, OPUS, FLAC, AIFF, WMA, WEBMA, MKA, AC3, EAC3, WV, AMR, DSF, DFF. Video uploads take MP4, M4V, MOV, AVI, WEBM, MKV, FLV, TS, MTS, M2TS, 3GP, 3GPP, 3G2, WMV, ASF, VOB, OGV, RM, RMVB, MPG, MPEG, M2V, F4V, MXF, and the MP3 is the video’s audio track.
Which Converter Should You Use?
You only need the MP3
A WAV for an email, a FLAC for an old player. Use CloudConvert or FreeConvert: free within their limits, and FreeConvert lets you pick the bitrate. Nothing stays behind afterwards.
You need the words too
An interview to quote, a lecture to search, a stack of voice memos you will come back to. You get the MP3 plus a transcript and AI chat on the same upload, kept in your library.
How to Convert a File to MP3
- Upload the file. Drop an audio or video file on the tool above, or pick one from your computer or phone. Sign in with a free account to save it.
- Let it process. ScreenApp stores the file and transcribes the audio. Both appear in your library when processing finishes.
- Download the MP3. Open the file and press Download Audio. Downloads are on paid plans, from $19 a month billed annually.
Got a YouTube link instead of a file? The link tab on this page imports the video, not an MP3. Use YouTube to MP3: it imports the link and gives you MP3 at about 190 kbps (VBR), and YouTube link imports do not count against the upload limit.
Keep the original until you are done
Edit the WAV
Cut, level and clean up in the lossless file.
Export MP3 last
Make the MP3 only when the audio is final.
Archive the WAV
Re-editing an MP3 and saving it again loses more detail each time.
MP3 is a delivery format. Treat it like a PDF of your audio, not the working file.
What It Can and Cannot Do
Good at
- Turning audio and video files into an MP3
- Several files in one upload
- A transcript and AI chat on every file
- Trimming the start or end before you download
Not built for
- Bitrate or sample rate settings: there are none to change
- Free MP3 downloads: Paid plans only
- Other output formats: no WAV, FLAC or M4A out, only MP3
- Links on this page: for YouTube audio, use the YouTube to MP3 page
MP3 Converter vs Other Tools
| Feature | ScreenApp | CloudConvert | FreeConvert |
|---|---|---|---|
| Max file size, free | 2 GB (free online tool) | 1 GB | 1 GB |
| Free allowance | 3 uploads, lifetime | 10 conversions a day | Not stated beyond the file size cap |
| MP3 download on the free plan | No | Yes | Yes |
| Bitrate and sample rate settings | No | Quality and file size options | Offers bitrate, sample rate and codec settings |
| Transcript of the audio | Yes | Not stated | Not stated |
| Paid plan | $19/month annual | Not stated (credit packs, priced by volume) | $12.99/month |
Sources, checked 2026-09-24: ScreenApp pricing, CloudConvert pricing, FreeConvert MP3 converter, FreeConvert pricing
- vs CloudConvert: 10 free conversions a day on files up to 1 GB, and you download the MP3 straight away. For a file and nothing else, start here.
- vs FreeConvert: free files up to 1 GB, with bitrate, sample rate and codec settings, and uploads deleted after 8 hours. The pick if you care which bitrate you get.
Single-Format Pages
WAV to MP3
Recorder and studio files. Open the WAV page
M4A to MP3
iPhone and Zoom audio. Open the M4A page
Voice memo to MP3
iPhone Voice Memos. Open the voice memo page
FLAC to MP3
Lossless music. Open the FLAC page
MP4 to MP3
Sound from a video. Open the MP4 to MP3 page
YouTube to MP3
Audio from a link. Open the YouTube page
Who Converts Files to MP3
Podcasters who record in WAV, edit in WAV, and need an MP3 for the guest and the host. The transcript gives them quotes for the show notes.
Students turning lecture recordings and voice memos into MP3s that play on any phone, then searching the transcript for the part about the exam.
Journalists and researchers archiving interviews, with the words kept next to the audio.
Anyone with a full phone, really. Voice memos add up.
