A speed changer that never
stamps your music

The exact policy: 0 sounds over your music

"No watermark" claims deserve suspicion, so here is this tool's policy stated precisely enough to be checked. From the first sample of your song to the last, nothing is mixed in, layered over, or stamped into the audio. Not quietly, not briefly, not on the free tier. The music in a free export is bit-for-bit the processed music and nothing else.

The honest exception, in full: a free export adds a short spoken note after the song has completely ended. It sits behind the final second like a trailer after the credits, and any trimmer — a phone editor, QuickTime, anything that can cut audio — removes it in one crop, leaving the music untouched because it never touched the music. That is the entire cost of the free export. There is no hidden second mark.

Why mid-track stamps exist elsewhere

Some converters place a voice tag or tone inside the track on free plans, usually repeating so it cannot be cropped out. The logic is commercial: a mark you cannot remove forces the upgrade. It also ruins the export as music. This tool takes the opposite bet — the free export should be genuinely usable, and the note after the song is disclosure, not sabotage. You can verify all of this in two minutes with the demo track before committing anything of your own.

The placement is also a promise about editing: because the note sits entirely outside the music, cropping it is lossless to the track. There is no fade to repair, no overlap to work around, and no judgment call about where the mark ends — the music ends, then the note begins.

What you are exporting, cleanly

The tool itself: speed from 50% to 200% with pitch linked at 12 semitones per doubling — slowed versions center around 85%, sped-up ones between 115% and 135% by long convention. Six reverb rooms with a mix control, loop, volume, waveform, and export to MP3 or WAV, free, for files up to 50 MB.

Because the processing happens in your browser tab rather than on a server, the clean-export policy is also structurally easy to keep: there is no upload step where a service could hold your file hostage, and no account whose tier decides how damaged your export will be.

A craft note on clean exports

A watermark is not the only thing that can spoil an export — clipping does it more often. Reverb adds level, so if you raise the mix, lower the volume slider slightly and check the loudest chorus before exporting. WAV is the safer format if the file is going into a video editor next; MP3 is fine for direct sharing.

Start to finish, including the crop

The full path from original file to clean posted audio.

1. Open the page and drop your song on the tool — up to 50 MB, or start with the demo track to verify the export policy first.
2. Set the speed: down for slowed, up for sped-up, by ear while it plays.
3. Optional: add a reverb room, keep the mix modest, and lower the volume slider a touch if you pushed it.
4. Export as MP3 or WAV. Play the file once — the music runs clean from start to finish, then the short spoken note follows the ending.
5. If you want the note gone, open the file in any trimmer, cut at the end of the music, save. One crop; the track itself was never touched.

Posting the edit cleanly

A clean export deserves a clean release. Two habits separate edits people enjoy from edits that annoy the artist and the audience.

The first is credit. A sped-up or slowed version is someone else's song at a different speed — say whose, in the caption or the description, every time. Beyond fairness, credit is how listeners find the original, and edit audiences actively search for source tracks; naming the artist costs one line and completes the loop. What you should not do is present an edit as an original work, or monetize someone else's song — a speed change does not create new rights, and platforms remove edits at rights holders' request regardless of how the file was made.

Format for the destination

If the edit goes under a video, hand your video editor the WAV: the render will encode the audio anyway, and starting from WAV keeps the final result one compression generation from your source instead of two. If the edit is shared as a file — a chat, a download link of your own — MP3 is the sensible choice at roughly a tenth of the size. Either way, play the export start to finish once before posting. You are listening for two things: that the ending is where you want it after cropping the spoken note, and that the loudest chorus is clean — clipping from an enthusiastic reverb mix ruins more edits than any watermark ever has.

Keep your own master

Keep the original file and name your exports with their speed — "song 90 hall.mp3" — so next month's you knows which version this is. An export cannot be un-edited back into the original: two speed changes and two encodes always leave a mark. The source is the master; everything you post is a copy of it.

The same principle, in the app

You love clean versions of your music? There is a player for that.

Y2K Player, a music player for iPhone and iPad, extends the same rule to video: exports at 1080p over visualizers carry a quiet visual mark on the free tier, and the audio is never watermarked — not free, not ever. In the app your songs keep their speed and effect settings permanently, playlists play your versions, the whole library works offline, and no account exists. Free to use. Pro is one payment — forever.