Trimr
Audio editor for macOS100% on deviceFree, including commercial use
Every audio tool. One window.
Trim, cut silence, normalize loudness, fade, change speed, join, split, make ringtones, convert. Drag in any audio file, or a video to pull the sound out of it, and Trimr handles it all on your Mac. Nothing is ever uploaded.
v1.4.3 · macOS 13+, including 27 Golden Gate · Apple Silicon & Intel · Signed & notarized by Apple · No account
01 How it works
Three steps, then you're done.
Drag in your audio
Drop any audio file onto the window, or a video, and Trimr pulls the sound out for you. The waveform appears instantly, ready to edit.
Shape it on the waveform
Drag to select (or press I and O), then trim, cut, remove silence, normalize, fade, or change speed. Space plays exactly what you'll export: playback skips your cuts, so you hear the final edit first.
Export
Pick M4A, MP3, WAV, FLAC, AIFF, OGG or OPUS, or an iPhone ringtone. Every export writes a new file: Trimr will not write over the file it is reading, or over any other original sitting in your queue.
02 Features
Everything Mac audio editing should be.
One focused, native window with every tool you reach for, without ever sending your audio to the cloud.
A real waveform editor
See your audio, drag to select, zoom to the millisecond, and play exactly what you'll export. Drop in a video and Trimr pulls its soundtrack out automatically.
Trim & cut anything
Keep only the selection, or cut out as many sections as you like. Cuts preview live (playback skips them so you hear the final edit before exporting) and every cut is one click to restore.
Non-destructive
Silence, gone
Find every quiet gap (you choose how quiet and for how long), see them highlighted on the waveform, and remove them all in one click. Or split the file into separate tracks at each silence.
Lossless trims
Trimming an MP3, M4A, AAC, OGG or Opus file and saving it back to the same format copies the encoded audio across byte for byte, no decoding, no re-compressing, no quality lost for a job that only removed the ends. It applies when nothing else about the audio changes, and Trimr tells you when an export qualifies and which setting is stopping it when it does not. A copy can only cut on an encoded frame boundary, so the trim point can land up to about a tenth of a second from where you put it.
New in 1.3.0
Split points
For a recording that never goes quiet (a DJ set, a side of a record, a lecture with no pauses), put the playhead where one track ends and mark it. Split the file into that many separate tracks in one go. A split that stumbles on track seven keeps the six it finished, and says how many it did not.
New in 1.3.0
Set once, apply to all
A queue is usually one session's recordings wanting the same treatment. Dial in the volume, speed and fades on one file and give them to every other file at once. Trims stay put: those belong to their own waveform.
New in 1.3.0
Every row has its own controls
Each file in the queue carries its own Export button. Start just that one; while it runs the same button becomes Stop and stops only that file; when it lands, Open and Reveal appear beside it. A queue of twenty where one file needs redoing no longer means redoing all twenty. Splits, joins and ringtones can be stopped the same way.
New in 1.3.0
Rows you can tell apart
Drop a folder and Trimr takes everything inside it, subfolders and all, so a queue of
New in 1.3.0
track01.wav rows used to be indistinguishable. Each row now shows the folder it came from, just the part that differs, and only when the queue spans more than one. A dropped folder also arrives in reading order now, which matters because Join concatenates in queue order.Loudness done right
Measure real loudness (LUFS + true peak), then normalize to −14 LUFS for streaming, −16 for podcasts, −23 for broadcast, or a −1 dB peak: a true two-pass EBU R128 pass, measured on the edited audio.
EBU R128
Fades you can see
Smooth or linear fade in and out, drawn right on the waveform, so you see exactly what you'll hear.
Speed, pitch intact
Slow down to 0.5× or speed up to 3× with pitch preserved: the preview plays at the new speed, so a 2× podcast still sounds like the host, not a chipmunk.
Join with crossfade
Combine files in any order into one seamless track, with an optional crossfade between them.
iPhone ringtones
Select up to 40 seconds and get an iPhone-ready .m4r with a gentle automatic fade-out. Any song, any recording, your ringtone.
.M4R
Convert anything
M4A, MP3, WAV, FLAC, AIFF, OGG and OPUS out, with bitrate, sample-rate and mono/stereo control. Almost any audio or video format in.
100% on your Mac
Nothing is uploaded, ever. No account, no cloud, no usage analytics. Your trims, cuts, fades and speed changes are applied on the way out, so every export is a new file and no original in your queue is ever written over. The Tags panel is the one deliberate exception: tagging means writing into the file itself, and it says so.
Privacy
Signed & notarized
Opens with a normal double-click, no "unidentified developer" warning, no Open Anyway, no Terminal. Notarized by Apple.
No warnings
Stays up to date
Trimr checks for a new version about once a week and offers it in a small update window, which installs it in one click and reopens Trimr. Every update is signature-checked before it installs, and you can turn the check off anytime.
New in 1.1.0
Matches your Mac
The whole window (and the Dock icon with it) follows your system's Light or Dark appearance automatically, or pin it to Light or Dark yourself from the appearance toggle.
Built for everyone
The whole editor is keyboard-driven (Space, arrows, I/O, Z/F) with VoiceOver labels throughout, and the UI meets WCAG 2.1 AA contrast in light and dark.
WCAG 2.1 AA
Speaks your language
Trimr's interface comes in 13 languages (German, English, Spanish, French, Italian, Japanese, Korean, Dutch, Polish, Brazilian Portuguese, Russian, Turkish and Simplified Chinese) and auto-detects your Mac's language on first launch. Switch anytime from the in-app flag picker; the whole window follows, sheets included.
Edit tags & album art
Title, artist, album, year, genre, comment, and album art: view and edit a file's built-in tags right in the app. Saved straight to the file, no export needed.
New in 1.1.9
Audition the selection
Play just the selected part: press ⇧Space or the play-selection button and playback starts at your in point and stops dead at your out point, so you can check a trim by ear.
New in 1.2.1
A real menu bar
Trimr answers about twenty keyboard shortcuts and had no way to discover one of them. There is a File menu (Add audio or video, Export, Join files, Clear all), a Help menu with the keyboard shortcuts and the release notes, and Settings and License where a Mac user looks for them.
New in 1.4.0
Right-click a file for its actions
Export or Stop, Open the export, Reveal it in Finder, and Remove, at the pointer, which is where a Mac user reaches for them. The same menu opens from the keyboard with ⇧F10 on the selected row.
New in 1.4.0
03 Reads & writes
M4A
MP3
WAV
FLAC
AIFF
OGG
OPUS
M4R ringtone
+ the audio from almost any video
06 Pricing
Free. For everyone.
Trimr is free for everyone, at home and at work. No license, no account, no nag screens, no watermarks, ever.
Personal
Free forever
For individuals and personal projects
- The full app, every feature
- No account, no nag screens
- Free updates forever
At work
Free commercial too
No license, no subscription
- Everything in Personal
- Use it commercially at work, free
- No license to buy, ever
- Free updates forever
Trimr is free for everyone, including commercial use at work. There is no license to buy and no subscription. The same app runs on the Mac and Windows builds.
07 Download & install
Get set up in seconds.
Download the app and drag it into Applications. That's it. No Terminal, no Homebrew, no sign-up.
Version 1.4.3 · Released September 28, 2026 · Free updates forever
macOS 13 Ventura or later, including macOS 27 Golden Gate · Apple Silicon or Intel
Everything Trimr needs (including the FFmpeg engine that powers the editing) is built right into the app. Nothing else to install.
Opens with a double-click
Trimr is signed with an Apple Developer ID and notarized by Apple, so it opens cleanly the first time, no
Open Anyway trip through System Settings, no Terminal. Open the DMG, drag Trimr into Applications, and launch it.Check the file you downloaded
Trimr is signed with an Apple Developer ID and notarized by Apple, and macOS checks that every time you open it. That is the check that catches a file altered on its way to you. To confirm it yourself, compare the SHA-256 of your copy with the one published for the
Trimr.dmg this page serves.SHA-256 checksum
Published checksum
Run this on your download and compare
shasum -a 256 ~/Downloads/Trimr.dmg
Or have your Mac compare them for you: save Trimr.dmg.sha256 beside the download and run shasum -a 256 -c Trimr.dmg.sha256.
08 FAQ
Common questions.
Is Trimr really free?
Personal use is free forever: every tool, no account, no trial timer, no watermarks. It is free for commercial use at work too, with no license to buy and no account.
Does Trimr upload my audio anywhere?
No. Every edit and export runs entirely on your Mac: nothing you open or export is ever uploaded, and there's no account and no usage analytics. The only time Trimr contacts our server is to check for updates (which sends the app version). Your audio is never involved.
Will it change my original files?
Editing doesn't. Your trims, cuts, fades, speed and loudness changes are applied when you export, and every export (including each track of a split, a join and a ringtone) writes a new file. Trimr will not write over the file it is reading, and it will not write over any other original sitting in your queue either, in any mode. Replace existing files replaces whatever is already at the name it wants in the destination folder, which is usually a leftover export from an earlier run; it cannot reach a file you added.
There is one deliberate exception, and it is the Tags panel. Editing a title, artist, album or cover art writes those tags into the original file itself (that is what tagging is, and there is no export step), so it is the one change Trimr makes that no later export can put right. The panel says so before you save, and offers an Undo on the confirmation afterwards, which puts the previous tags and cover art back for as long as Trimr stays open.
There is one deliberate exception, and it is the Tags panel. Editing a title, artist, album or cover art writes those tags into the original file itself (that is what tagging is, and there is no export step), so it is the one change Trimr makes that no later export can put right. The panel says so before you save, and offers an Undo on the confirmation afterwards, which puts the previous tags and cover art back for as long as Trimr stays open.
What formats can it read and write?
Out: M4A, MP3, WAV, FLAC, AIFF, OGG and OPUS, plus iPhone ringtones (.m4r), with bitrate, sample-rate and mono/stereo control. In: almost any audio format, or drop in a video and Trimr extracts its soundtrack.
How do I make an iPhone ringtone?
Open the file, select the part you want (up to the 40-second ringtone limit) and choose Ringtone. Trimr exports an iPhone-ready
.m4r with a gentle automatic fade-out, ready to sync to your iPhone.What do the loudness presets mean?
They're EBU R128 loudness targets: −14 LUFS is the standard for streaming platforms, −16 LUFS for podcasts, and −23 LUFS for broadcast. Trimr measures your edited audio and applies a true two-pass normalize so exports land on target, or you can normalize to a −1 dB peak instead.
Will macOS warn me about an unidentified developer?
No. Trimr is signed with an Apple Developer ID and notarized by Apple, so it opens with a normal double-click the first time. No Open Anyway dance, no Terminal.
How do I update Trimr?
Trimr updates itself. It checks about once a week and, when a new version is out, shows you what changed and offers to install it in place. The download is signature-checked, and one that doesn't verify is refused. You can also check on demand, turn the automatic check off in the update panel, or download the DMG from this page and drag it into Applications yourself. Your preferences carry over.
Is there a Windows version?
Yes, in beta. Trimr for Windows runs on Windows 10 (version 1809 or later) and Windows 11, 64-bit, and installs without admin rights.