Our Story
About Us
What Is TRIMR?
TRIMR is a free, browser-based audio trimmer. It lets you load any audio file, select a region on a visual waveform, preview the result, and export the trimmed clip — all without uploading anything to a server, creating an account, or installing software.
The tool runs entirely in your browser using the Web Audio API. Your files stay on your device. Always.
Why We Built It
Most online audio tools have the same business model: get users to upload files, process them on a server, and use that infrastructure to collect data, serve ads, or upsell subscriptions. The result is slow tools with bloated interfaces, privacy risks, and unnecessary friction.
We wanted to build something different — a tool so fast and simple that the upload step genuinely doesn't exist, not because we claim not to store files, but because the architecture makes it technically impossible. Browser-based audio processing means there's nothing to upload.
TRIMR is also the audio companion to Reel-Cutter.com, our free browser-based video trimmer. Same philosophy: private, fast, no uploads, no accounts.
Our Values
Privacy First
Audio files are personal. They may contain conversations, unreleased music, or sensitive recordings. We built TRIMR so we're technically incapable of accessing your content.
Zero Friction
No sign-up, no email confirmation, no onboarding flow. You open the page and you're ready to trim. The best tools get out of your way.
Truly Free
No watermarks, no file size limits, no "free tier" with a paywall. TRIMR is supported by non-intrusive analytics — no ads in the tool itself.
Honest & Simple
We don't oversell what TRIMR is. It's a trimmer. It does one thing well. We'd rather have a tool that's genuinely useful than one that promises everything.
The Technology
TRIMR is built on the Web Audio API — a browser-native audio processing engine supported in every modern browser since 2014. When you load a file, it's decoded into raw sample data in your browser's memory. The waveform is rendered on an HTML5 Canvas. The trim region is processed using an OfflineAudioContext — a render-as-fast-as-possible audio pipeline that doesn't require playback.
MP3 export uses the open-source lamejs library loaded from Cloudflare CDN. WAV encoding is written directly in JavaScript with no external dependency. OGG and WebM export use the browser's native MediaRecorder API.
The entire application is a single HTML file plus a CSS stylesheet. No frameworks, no build tools, no dependencies beyond lamejs. Fast to load, easy to audit.
By the Numbers
Get in Touch
Have a question, found a bug, or want to suggest a feature? We read every message. Reach us via the contact form or email directly at hello@trimr.net. We aim to respond within 48 hours.