Shifting by +2 semitone(s) at 100% speed.
People search “bpm changer” when a backing track is too fast to learn, and “audio speed and pitch changer” when they also need the key to sit under the voice. This page puts both controls on the Audio tab: playback speed from 50% to 150%, pitch by semitone or from-key / to-key, then a preview player before you save the MP3. Charts still transpose in the Text tab when paper has to match the new height.
The speed slider is a time-stretch control: below 100% slows the track for practice, above 100% pushes it forward—without the chipmunk effect you get from simply scrubbing rate on a phone player. Use it when you want a quieter learning pass, a tighter run-through, or a tempo check before the band commits.
Pitch and speed sit together on the right (semitones or key change, plus 50–150% playback). You can slow a demo without changing key, drop two semitones at 100% speed, or combine both—lower and slower for a singer who needs room. Convert once, listen in the page, download only when both feel right.
If the gig needs a printed grid, switch to Text file: paste ChordPro or import a text PDF and apply the same interval the singer heard on the MP3. Speed changes stay on the audio side; chord symbols care about pitch, not BPM. That split keeps rehearsal files and stand charts from fighting each other.
If you lead worship, sit in on a casual jam, or rehearse choir parts, you have probably opened a chart in one tab, a pitch tool in another, and still ended up guessing whether the new key actually fits. This tool is built around that workflow. Use it as a music transposer for chord symbols and note names, or switch to audio when you need to hear the shift. Charts stay formatted: chords above lyrics, ChordPro brackets, and plain text you can paste from anywhere. When you want to transpose sheet music you already have on disk, upload TXT, Markdown, DOCX, or a text-based PDF instead of retyping. Everything processes locally, which is what most people mean when they look to transpose online free without handing files to a server.
Plenty of sites will rewrite C–G–Am–F as D–A–Bm–G and call it done. Here the layout matters. Input and output scroll together so you can compare line by line. Toggle read view when you want chords highlighted like a performance chart, or stay in the editor when you are fixing typos from an import. Audio has its own path: upload, set semitones, preview in the page, and download only when it sounds right—no surprise MP3 on the first click. PDF import is included, with clear boundaries so you know what will work before you upload.
Open the Audio file tab and choose a track up to about five minutes and 20 MB. Set your semitone shift—or pick keys if that is how you think—and press Transpose audio. The tool decodes the file locally, applies the pitch change while keeping tempo steady, and loads a preview player. Listen for harsh artifacts on exposed vocals or solo instruments. If you change semitones after a run, hit Transpose again; the page will not silently overwrite a result you were still evaluating. Download the MP3 only when you are satisfied. Backing tracks for rehearsal and quick key checks are the most common use here.
On the Text file tab, upload a PDF exported from notation software or a chord site—something with real text you can highlight, not a phone photo saved as PDF. We read the text layer, pull chords and lyrics into the editor, and apply your chosen interval. Limits are intentional: one file up to 20 MB, and only the first 40 pages, which covers most single charts and short sets. Scanned books, image-only PDFs, and password-protected files are out of scope; you will get a clear error instead of garbage output. DOCX, TXT, and Markdown follow the same transpose rules once imported.
For a chart already on your clipboard, paste into the text box, choose semitones or a key change, and watch the lower panel update live. Slash chords, sevenths, and sus labels are left intact when recognized. Switch to read view to scan the chart as a singer would; switch back to edit when you need to fix a misaligned line from PDF import. Copy the result, or use the download menu for TXT, ChordPro, or PDF. Choir directors often paste one section at a time; gigging guitarists frequently drop the whole song and shift down two semitones to match a vocalist.
Short notes from people who needed a key change without rebuilding a chart from scratch.
I had a wedding set in Bb and the singer called it the morning of—down a whole step. I uploaded the PDF, shifted −2, skimmed read view for weird chords, and printed the export. Faster than typing it again.
Rachel T.
Wedding guitarist / used PDF import
"The MP3 preview sold me. I transposed a demo track up one semitone, heard the vocal strain, went back to zero, then tried −1. Downloaded once."
Marcus L.
Band vocalist / Rehearsal prep
"Our alto section charts come as ChordPro from a shared drive. Paste, key change, copy back—slashes and minors stay where they should."
Priya N.
Choir section leader / Weekly rehearsal
"I keep the interface on edit mode while fixing PDF imports, then flip to read view to check spacing. Less clutter than the old tools I bookmarked."
Jonah W.
Worship keyboard / Sunday planning
