Free browser tool · No sign-up · Local processing

Lofi Song Maker

Turn an existing recording into a softer, vintage-sounding version. Choose a file, adjust the effect and save MP3 or WAV. Free, without an account or audio upload.

Choose audioMP3, WAV, M4A, OGG, or FLAC · up to 50 MB · up to 15 minutesAudio stays on your device and is processed locally in this browser.

Lofi Song Maker: from original recording to finished version

Give a familiar recording a warmer sound

Start with a song, a loop or a performance whose melody and phrasing you enjoy. The converter works on that recording, softening high frequencies and blending gentle saturation with a short ambience effect. A separate vinyl layer adds background texture when you want it. Vocals and instruments remain part of the same performance, so a recognisable phrase makes a useful reference while you adjust the sound. Choose a passage where you can hear both a lead part and its accompaniment, then listen for how their balance changes.

A voice memo, a home-recorded guitar or a bright electronic demo gives you different things to work with. For a vocal take, listen for clear words and a comfortable range; for a loop, follow the kick and bass through a few repetitions. Work from a recording you are allowed to use, and keep a clean copy for later versions. This tool applies effects to existing audio rather than composing new music with an AI model. The practical aim is a version of your performance that suits a quieter listening mood.

Choose a source your browser can decode

Use the file chooser above or drop a local audio file into the selection area. The chooser accepts MP3, WAV, M4A, OGG and FLAC, but decoding depends on the browser and the codec inside the file. An extension is not a compatibility guarantee: two M4A files can contain different encodings. If a file cannot be read, export a fresh WAV or a conventional MP3 from your source application and try that copy instead of simply renaming the extension.

The input limit is 50 MiB and 15 minutes. Export capacity also depends on the decoded audio size and the memory available on your device. Decoded sound occupies much more memory than a compressed file, and slowing it down makes the rendered version longer. For a long podcast, dense mix or high-resolution recording, begin with a short excerpt. Listen to a quiet passage and a loud passage before applying the same settings to the material you actually need.

Set speed with the singer and groove in mind

The speed control runs from 0.70x to 1.10x, with 0.94x as the default. Lower values stretch the playback time and also lower pitch; this is not a pitch-preserving time-stretch tool. For a vocal song, start close to the original speed and listen for consonants becoming too heavy or words becoming difficult to understand. For an instrumental, pay attention to the bass line and whether the rhythm still feels intentional after the change.

For example, a 94-second recording at 0.94x lasts about 100 seconds before the short effect tail. That matters when you need a version for a video: the old edit points will no longer line up automatically. If timing is important, choose the speed before making the final video edit. A faster setting can also be useful for comparing the effect independently of the familiar slowed aesthetic. There is no single correct tempo for every source; choose a tempo that keeps the rhythm relaxed and the phrasing easy to follow.

Balance vintage texture against intelligibility

Vintage texture brings several sound-shaping changes together in one slider. Raising it brings the low-pass cutoff down and changes the saturation and subtle reverb contribution. At moderate values, this can soften sharp cymbals and bright synthesizers. At high values, it can also hide vocal detail or make already dark recordings feel crowded. Begin with the default 55%, then move in small steps while listening to the same passage.

Use each preset to hear a particular balance of speed, texture and noise. Warm Lo-fi uses the default settings; Soft & slow starts at 0.90x with 75% texture and 15% noise; Vinyl evening starts at 0.96x with 65% texture and 55% noise. A fragile acoustic performance may need less processing than a bright electronic loop. If the effect feels too heavy, reduce texture before changing several controls at once. This makes it easier to understand which adjustment actually helped the recording.

Add vinyl noise only when it serves the recording

Vinyl noise is independently adjustable from 0% to 100%, and zero turns the added noise off. The layer supplies a record-like background and occasional crackle that sit underneath your recording. Listen especially to introductions, pauses and endings, where noise becomes more noticeable. If the recording already contains room hiss or surface noise, an additional layer may distract from the performance instead of making it feel convincingly vintage.

Compare through headphones and ordinary speakers if both are available. A noise amount that disappears under a loud chorus can become dominant during a quiet verse. For spoken material, prioritise clarity and leave breathing room around words. You can also keep the softened tonal character while setting noise to zero. Keep quieter notes and vocal details easy to follow, with enough texture to support the atmosphere you want.

Compare fairly, then export the settings you chose

Switch between Original and Lo-fi to compare the unprocessed recording with your current effect. The comparison keeps the source position, although the two versions run at different speeds when a speed change is active. Use a recognisable phrase to judge the change rather than comparing unrelated parts of the song. Reset restores the default parameters. The Original switch affects preview only: downloading still renders the selected lo-fi settings, even if you last listened to the original.

Choose MP3 for a compact listening copy, with 128, 192 or 320 kbps available, or PCM WAV when you want an uncompressed output for another editing step. Saving a compressed source as WAV does not restore information that was already lost. The download uses a new filename ending in -lofi and leaves your source file untouched. Keep that source separately, and make later variations from it rather than repeatedly reprocessing the latest exported MP3.

Local processing, practical limits and the next editing step

Decoding, effect preview and export take place in your browser, and the selected recording stays on your device during processing. You can use the tool for free without an account or a credit balance. Keep the tab open until rendering and encoding finish, especially on a phone. When cancelling an export, wait for the cancellation state to clear before starting another. Save the completed download somewhere you can find again, alongside the original source and a note of any settings you want to repeat.

If the decoded-audio memory guard blocks an export, shorten the source or try a device with more available memory. A smaller excerpt also helps you evaluate a troublesome transition before processing the whole song. Use Audio cutter for precise start and end points, or Slowed and reverb when you want to focus on speed and a more prominent ambience. To work on an instrumental, separate its vocals first and bring the accompaniment back here. Check the source permissions again before sharing a finished version publicly.

How to use the lo-fi converter

How do I convert a song to lo-fi?

Choose a local audio file, start with a preset, then adjust speed, vintage texture and vinyl noise. Preview the result, select MP3 or WAV and download.

Do I need an account or credits?

No. This browser-based converter is free to use and does not require a login or a credit balance.

Can I keep the lo-fi effect without vinyl noise?

Yes. Set Vinyl noise to 0% and keep your chosen speed and vintage texture settings.

Does the speed control preserve pitch?

No. Lower speed also lowers pitch, while higher speed raises it. Start near 1.00x if you want a smaller pitch change.

Will Original mode export the unprocessed song?

No. Original is a preview comparison. Downloads always apply the current lo-fi settings.

Why can a small MP3 fail to export?

A compressed file may decode into a large audio buffer. The memory guard can block export; try a shorter source or a device with more available memory.