How to Convert Any Song to Lo-Fi
Five steps, about two minutes start to finish. Nothing to install, no account, and no upload — the file is read by your browser and stays there.
- Upload your audio file — Drag and drop, or click to browse. MP3, WAV, FLAC, OGG, AAC, M4A are accepted, up to 500 MB. The file is read by your browser and is not uploaded anywhere.
- Choose a lo-fi preset — Pick one of the 5 presets — Classic Lo-Fi, Dreamy Ambient, Vintage Radio, Chillhop, Jazz Lo-Fi. The track is re-rendered with the new settings straight away.
- Fine-tune the effects — Adjust speed (50–100%), pitch (-12 to +12 semitones), filter cutoff, reverb, bit crush, vinyl crackle, tape wobble and bass boost. Edits re-render automatically after a short pause.
- Preview the result — Play the converted track in the browser and seek through it to check the effect settings before committing to a download.
- Download the converted track — Export as MP3 (192 kbps) or lossless WAV. No watermark, no account, no usage limit.
The Five Lo-Fi Presets Compared
Each preset is a different combination of tempo, pitch, reverb, bit depth and filter cutoff. Every value below stays editable after you pick one.
| Preset | Speed | Pitch | Reverb | Bit crush | Filter cutoff | Best for |
|---|---|---|---|---|---|---|
| Classic Lo-Fi | 85% | −3 st | Medium | 12-bit | 4.0 kHz | General-purpose lo-fi remixes, study playlists |
| Dreamy Ambient | 75% | −4 st | Heavy | 16-bit | 3.5 kHz | Sleep and meditation edits, ambient video beds |
| Vintage Radio | 90% | −2 st | Light | 8-bit | 3.0 kHz | Retro or found-footage edits, radio-style intros |
| Chillhop | 80% | −3 st | Medium | Off | 5.0 kHz | Focus and homework beats, café-style background |
| Jazz Lo-Fi | 85% | −2 st | Light | Off | 4.5 kHz | Mellow vocal edits, podcast beds, late-night mixes |
What Does a Lo-Fi Converter Do?
A lo-fi converter takes a finished, clean recording and degrades it on purpose. It is not a compressor and not a format converter: the point is not a smaller file, it is a specific aesthetic — the muffled, crackling, slightly unsteady sound of music played back on worn equipment, which is what the lo-fi hip hop study streams popularised.
Doing it convincingly takes more than one effect. Slowing a track down alone just makes it slow; the character comes from stacking a filter, noise, reverb, quantisation and pitch drift so that no single one of them is obvious on its own.
The Five Effects, and What Each One Does
The converter renders these offline through the Web Audio API rather than recording playback, so a track is ready in seconds and the export is bit-identical to the preview.
Low-pass filter
Rolls off the high frequencies so the track sounds muffled and distant, the way a cassette or a stereo in the next room does.
Cutoff is adjustable from 1 kHz to 8 kHz. Lower is darker; around 3–4 kHz is the classic lo-fi range.
Vinyl crackle
Lays a bed of pops and surface noise under the music for the record-player feel, without needing a real turntable.
Generated procedurally at playback length rather than looped from a sample, so it never repeats audibly on long tracks.
Reverb
A convolution reverb that adds room and depth, which is what makes a lo-fi edit sound spacious rather than just dull.
Three decay lengths: Light 0.8 s, Medium 1.8 s, Heavy 3.5 s. The wet signal is mixed in at 35%, so the original stays present.
Bit crushing
Quantises the samples to a lower bit depth, adding the grit of early hardware samplers and game consoles.
16-bit, 12-bit, 8-bit, or off. 12-bit is the early-sampler sound; 8-bit is heavily degraded and obvious.
Tape wobble
A slow pitch modulation that imitates worn magnetic tape, giving the track a gentle woozy drift.
A 2 Hz LFO at a shallow depth — enough to feel unsteady, not enough to sound out of tune.
Lo-Fi Converter vs Slowed + Reverb vs Lo-Fi Maker
Three tools that sound similar and are not interchangeable. The short version: convert when you have a song and want the full treatment, use Slowed + Reverb when you only want it slower and more spacious, and use the Lo-Fi Maker when you need music you are allowed to publish.
| Aspect | Lo-Fi Converter | Slowed + Reverb | Lo-Fi Maker |
|---|---|---|---|
| Starting point | A song you already have | A song you already have | Nothing — the beat is generated |
| Effects applied | Filter, crackle, reverb, bit crush, wobble, speed, pitch | Speed and reverb only | Full lo-fi chain on synthesised parts |
| Sounds like | A worn tape or vinyl rip of the original | A dreamy, cavernous slow edit | An original lo-fi hip hop instrumental |
| Rights to the output | You need rights to the source track | You need rights to the source track | Royalty-free — generated, not sampled |
| Use it when | You want a full lo-fi treatment of a specific song | You only want it slower and more spacious | You need background music you can license freely |
Who Uses a Lo-Fi Converter?
Students building study playlists, streamers and YouTubers who need a background bed that does not fight with speech, editors matching music to vintage or nostalgic footage, and musicians auditioning how a mix holds up once the top end is gone — a surprisingly good test of whether an arrangement works. It is also the fastest way to make a track sit behind a voiceover without reaching for an EQ.
Technical Specifications
| Input formats | MP3, WAV, FLAC, OGG, AAC, M4A |
|---|---|
| Maximum file size | 500 MB |
| Presets | 5 — Classic Lo-Fi, Dreamy Ambient, Vintage Radio, Chillhop, Jazz Lo-Fi |
| Speed range | 50% to 100% of original tempo |
| Pitch range | -12 to +12 semitones |
| Filter cutoff | 1 kHz to 8 kHz, 100 Hz steps |
| Reverb decay | Light 0.8 s, Medium 1.8 s, Heavy 3.5 s |
| Bit crush depths | 16-bit, 12-bit, 8-bit, or off |
| Tape wobble | 2 Hz pitch modulation |
| Export formats | MP3 (192 kbps) or WAV (16-bit, lossless) |
| Processing location | Entirely in your browser, via the Web Audio API |
| Account required | No — free, no signup, no watermark |
Frequently Asked Questions
Can I convert MP3 to lo-fi online for free?
Yes. SonicLab's lo-fi converter is completely free with no account required. Upload any MP3 file, apply the lo-fi effects, and download your converted track instantly with no watermarks or usage limits.
What audio file formats are supported?
The converter accepts MP3, WAV, FLAC, OGG, AAC, M4A files up to 500 MB. You can export your lo-fi track as MP3 (192 kbps) or lossless WAV.
Is my audio uploaded to a server?
No. All processing happens locally in your browser using the Web Audio API. Your audio file never leaves your device, so there are no privacy concerns and no upload wait.
How do I make a song sound lo-fi?
Slow it down slightly, drop the pitch a couple of semitones, cut the high frequencies with a low-pass filter around 3–4 kHz, then add reverb, vinyl crackle and a little bit crushing. The Classic Lo-Fi preset applies exactly that combination, and you can adjust any part of it afterwards.
Does this lo-fi converter work on mobile?
Yes. The tool is responsive and runs on iOS Safari and Android Chrome using the Web Audio API. No app download is required. Because processing happens on the device, use files under about 100 MB on a phone for comfortable performance.
Will converting to lo-fi reduce audio quality?
Yes, deliberately — reducing fidelity is the point of the format. For the highest output quality, export as WAV rather than MP3. If you want the aesthetic with minimal degradation, use the 16-bit bit crush setting and a higher filter cutoff of 6–8 kHz.
Can I download the converted file?
Yes. Once processing completes, download the track as MP3 or WAV — free, no watermark, no account needed. The download button activates as soon as the render finishes.
How long does conversion take?
It depends on the file length and your device. A typical 3–4 minute track takes roughly 5–15 seconds on a modern desktop, and longer on an older phone. Because everything runs locally, your internet speed has no effect on it.
Which browsers are supported?
All current browsers: Chrome 80+, Firefox 75+, Safari 14+ and Edge 80+. The tool needs JavaScript and the Web Audio API, both enabled by default everywhere.
What is the difference between lo-fi and slowed + reverb?
Slowed + reverb changes only two things: tempo and reverb. A lo-fi conversion also applies low-pass filtering, bit crushing, vinyl crackle and tape wobble, which is what produces the worn, vintage character rather than just a dreamy one. Both are available as separate tools on SonicLab.
Can I use the converted track commercially?
That depends entirely on the source. Converting a track to lo-fi does not grant you any rights to it, so you need to already own the original or have it under a licence that permits derivative works. SonicLab adds no restrictions of its own to the output.
Can I convert a YouTube video to lo-fi?
Not directly — the converter works on audio files you already have on your device. You would need the audio as an MP3, WAV, FLAC, OGG or AAC file first, and you should only do that with content you have the rights to.