Mp3kb: MP3 Compressor by Size

MP3 compressor by size: type the number of KB or MB you need, and Mp3kb makes an MP3 that fits under it, checked on disk before it is saved. Compress audio size in KB or MB for music, voice recordings or the sound of a video, to 1 MB, 16 MB or any size you type; the result is never bigger than your original. An audio compressor offline from the first launch, with nothing uploaded. TYPE THE SIZE, GET THE FILE Most compressors ask for a level and leave you guessing; Mp3kb asks for the size. Type 950 KB or 16 MB (1 KB = 1000 bytes), or tap a preset: 1 MB, 5 MB or 16 MB for chat apps. Mp3kb works out the bitrate from the length, encodes, then reads the real byte count of the saved file. Over? It encodes again a little lower. Room left? A little higher. Up to 4 passes, and it keeps the largest file that is still under your number. Compress audio size in KB without trial and error: the result shows the target, the size on disk and how many passes it took. NEVER BIGGER THAN THE ORIGINAL Apps that promise to reduce audio file size sometimes hand back a larger file. Mp3kb checks first. If your file already fits in the same format, you see "Already under" and the original is kept as is, never inflated. If a size is too small for the length, you see "Can't fit" with the smallest clear size this file can reach, and one tap to use it. MP3 THAT PLAYS EVERYWHERE MP3 is the default because it plays everywhere; M4A is there too. Choose Auto, or Voice for speech: mono and tuned to the speech band, so you can compress audio recordings of speech to 8 to 24 kbps and still hear every word. Advanced settings let you set the channels (auto, mono or stereo) and the sample rate yourself. HEAR IT BEFORE YOU SHARE A/B preview plays the same 10 seconds of the original and of the compressed file, so you hear the difference before you send anything. Then share it from the result. Every result is saved to Music/Mp3kb, so you can compress audio files today and find them later in any player. WORKS WITH YOUR OTHER APPS Compress audio recording files where they already are: share a voice memo, a lecture or an audio message into Mp3kb from your recorder, chat or file app. One file opens ready to compress; several open as a batch. Sending audio in chat apps such as WhatsApp or Telegram, or attaching it to an email, is why most people need to reduce audio file size, and the presets follow those limits. VIDEO IN, SMALL MP3 OUT Pick a video and Mp3kb keeps only the audio, as a small MP3 under your size. Handy for lectures and talks when only the sound matters. BATCH IS INCLUDED Pick many files and compress audio files in one run, each under the same size. Files that already fit are kept as is. The History tab lists everything you have compressed. OFFLINE AND PRIVATE Mp3kb is an audio compressor offline by design. Every file is processed on your phone, nothing is uploaded, no account is needed, and your originals are never changed: the compressed copy is always a new file. MP3KB PRO The MP3 compressor by size itself stays free, with MP3 and M4A, Voice mode, A/B preview, sharing and batch with one size each. Pro adds: - All presets: 500 KB, 10 MB, 25 MB for email, 50 MB and 100 MB. - Split to fit: a recording too long for the size becomes equal parts that each fit. - Trim silence: pauses longer than 1 second are removed first, so more quality fits. - Batch total: one size limit shared across all files, sent as a single ZIP. - OPUS output, the clearest speech per kilobyte. - Music HQ: stereo kept longer, with the most careful encoder search. - Podcast loudness, levelled to -16 LUFS. - No ads. You can try some of this first: the presets or Trim silence for 60 minutes, or one more Split or Batch total run, after a short video you choose to watch. Pro is monthly, yearly with a 3-day free trial, or a one-time Lifetime purchase. Subscriptions renew until canceled in Google Play. PRIVACY No sign-in and no uploads; ads and purchases use Google services.

Ad network update and stability improvements.