Guide5 min read
How to Change Audio Pitch (Free, No Upload)
Shift an audio file's pitch up or down by semitones while keeping its tempo exactly the same — free, in your browser, no upload. Works with MP3, WAV, M4A, OGG, and FLAC.
Audio compressor
Reduce audio file size — free, instant, and private. Nothing is uploaded.
Drop an audio file here, or click to browse
MP3, WAV, M4A, OGG, or FLAC — up to 2GB
✓Free forever
✓Runs locally
✓No account
✓No watermark
Everything you need to compress audio fast
Simple quality slider
Dial in exactly the right balance between file size and audio fidelity with a single slider mapped to a real MP3 bitrate, from 64kbps up to 320kbps.
Before and after size comparison
See the original and compressed file sizes side by side, with a clear percentage badge showing exactly how much space you saved.
Works with your existing format
Drop in MP3, WAV, M4A, OGG, or FLAC — no need to convert first. The compressed result is saved as a widely-compatible MP3.
Private by design
Your audio never leaves your device. PixelTools runs entirely in your browser using ffmpeg.wasm — zero server uploads, zero data stored.
Great for lossless recordings
Shrink a lossless WAV or FLAC recording down to a fraction of its size while keeping it easy to share and play anywhere.
No account, no watermark
Free to use with no sign-up, no file limits, and no watermark or audible artifact added to your compressed file.
Three steps to a smaller audio file
- 1
Upload your audio
Drag and drop an audio file onto the page, or click to browse. Supports MP3, WAV, M4A, OGG, and FLAC files up to 2GB.
- 2
Choose a quality level
Use the quality slider to balance file size against audio fidelity — higher settings keep more detail, lower settings produce a smaller file.
- 3
Download your compressed audio
Your file is re-encoded instantly in your browser. Download the result as MP3. Nothing is uploaded to any server — your file stays on your device.
Built for anyone who works with audio
Whether you are emailing a voice memo under a size limit, backing up a podcast master, or prepping a lecture recording for upload — PixelTools compresses it in your browser in seconds.
Email and messaging limits
Shrink a voice memo or recording below your email provider's or messaging app's attachment size cap without re-recording it.
Faster uploads and backups
Compress podcast masters and interview recordings before uploading to cloud storage or a shared drive, saving time and bandwidth.
Podcasters and musicians
Bring oversized WAV exports down to a manageable MP3 size before publishing, without giving up noticeable quality.
Students and professionals
Shrink lecture recordings and meeting audio to fit under upload limits for LMS platforms or file-sharing tools.
Frequently asked questions
Is PixelTools audio compressor free?
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Yes, completely free with no limits. Compress as many audio files as you want, as often as you want. No subscription, no trial, no account required.
Are my audio files uploaded to a server?
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No. PixelTools compresses audio entirely in your browser using ffmpeg.wasm. Your files never leave your device — there is no server upload, no cloud processing, and no data stored anywhere.
What audio formats can I compress?
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PixelTools accepts MP3, WAV, M4A, OGG, and FLAC as input. The compressed output is always saved as MP3 for the widest compatibility across phones, players, and platforms.
Will compressing reduce my audio's quality?
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Some quality loss is inherent to any lossy compression — that is how the file gets smaller. The quality slider lets you choose the tradeoff: higher settings keep more detail, lower settings produce a smaller file. The default balanced setting is a good middle ground for sharing and uploading.
How much smaller will my audio file get?
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It depends on the source: converting a lossless WAV or FLAC recording to a lower-bitrate MP3 can shrink the file 80-90%, while an already-compressed MP3 re-encoded at a similar bitrate will see a much smaller gain. Try a lower quality setting for a bigger reduction.
What is the maximum file size I can compress?
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PixelTools can handle audio files up to 2GB. Processing time depends on the file's length, the quality setting you choose, and your device's performance, since everything runs locally in your browser.
Why does this always output MP3, even if I upload a WAV or FLAC file?
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Compression means re-encoding to a smaller lossy format — MP3 is the most universally compatible choice, so every source format is re-encoded to MP3 at your chosen bitrate. If you need to keep the original format, use the Audio Format Converter instead.
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