MP3 to MP4 route
MP3 to MP4 Converter
Turn audio-only uploads into an MP4-ready delivery format for tools and publishing flows that expect a video container.
Runs locally in your browser
Privacy-firstUp to 100 MB per file · 3-file batch limit
How it works
Three steps. No friction.
Upload
Drop or paste any file — Device mode keeps it on your machine.
Pick a target
Choose a format (or a compress preset). Per-file controls if you need them.
Download
Grab a single file or zip the whole batch in one click.
Built for
Common use cases
Prepare podcast audio for social schedulers that only accept MP4.
Wrap voiceover tracks for classroom portals that require video containers.
Queue multiple lesson files and keep per-file bitrate settings in one place.
Audio wrapped for video-first platforms
MP3 to MP4 Converter
Best for podcasts, ad managers, LMS uploads, and social workflows that reject raw audio files.
Default output starts at MP4, but each uploaded file can still target WAV, AAC, OGG, or another valid format.
MPEG-1 Audio Layer 3
About MP3 (source)
Lossy audio compressed by perceptual coding. The default for podcasts, voice memos, and music distribution — small files, universal playback.
MPEG-4 Part 14
About MP4 (target)
A widely supported container for video plus audio, captions, and metadata. Plays everywhere — phones, browsers, social uploads, smart TVs.
Premium
Bigger files. Faster encoders. Lossless presets.
Up to 500 MB/file, 15-file batches and Cloud GPU queue. Cancel any time.
Upgrade to PremiumFAQ
Frequently asked
Yes. Converting MP3 to MP4 is free. Device processing runs in your browser with no account needed; Cloud processing (better encoders, queue tracking) is also free with a quick signup. Shorty Premium unlocks larger file sizes and bigger batch limits for high-volume workflows.
Yes. Each uploaded file gets its own queue card with independent format, quality, and processing controls. You can convert the entire batch at once or start individual items in any order.
Available controls depend on the file type. Audio and video files expose bitrate and trim options. Image files include quality and resolution scaling. PDF conversions include page range and render quality settings where applicable.
Device processing runs conversions locally in your browser — ideal for quick jobs, privacy-sensitive files, and works without an account. Cloud processing queues the job on Shorty's servers and keeps outputs ready to download — free with a quick signup (no card). Premium lifts the file-size and batch caps on top of either mode.
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