Audio tools

Guide to editing, converting, recording and transcribing audio on-device.

All guides

Getting started: What OpenFile is, how to use your first tool, install it as an app and work offline.
How OpenFile works: The zero-upload privacy architecture, the processing engines and first-use model downloads.
Keyboard shortcuts: Global, command palette, docs and Sketch board keyboard shortcuts.
PDF tools: Guide to every PDF tool: merge, split, compress, sign, protect, OCR and more.
Convert: Guide to converting between PDF, Word, Excel, PowerPoint, Markdown, HTML and images.
Image tools: Guide to compressing, resizing, converting, background removal, upscaling and editing images.
Video tools: Guide to trimming, compressing, converting, GIFs and recording video in the browser.
Audio tools: Guide to editing, converting, recording and transcribing audio on-device.
Developer tools: Guide to JSON, JWT, hashes, regex, QR codes, cURL conversion and other developer utilities.
Text & data tools: Guide to diffing, counting, case conversion, Markdown and text cleanup tools.
Design tools: Guide to colors, gradients, CSS, favicons, SVG and the Sketch whiteboard.
Workspace pipelines: Chain steps into reusable recipes and batch-process hundreds of images or PDFs.
Sketch board: The infinite whiteboard: tools, boards, sharing, presenting, exporting and shortcuts.
Favorites, history & settings: How favorites, recent tools, activity history and settings are stored locally in IndexedDB.
Self-hosting: Deploy OpenFile to Vercel, GitHub Pages, any static host or Docker with nginx.
API reference: The optional Vercel serverless routes: /api/health, /api/fetch-page and /api/meta.
Browser support: Which browsers and platform features each group of tools needs.
FAQ: Answers to common questions about privacy, limits, offline use and troubleshooting.
Contributing & adding a tool: Set up the project, follow the tool conventions and add a new tool to the registry.
Changelog: Release notes for every OpenFile version.
Install on every device: Install OpenFile as a web app, a desktop app for Windows, macOS and Linux, an Android APK or on iPhone.
Using tools: Drop zones, batches, page ranges, presets, history, undo and where your downloads go.
Themes and accessibility: Black, dark, light and system themes, accent colors, fonts, density, reduced motion and keyboard use.
Offline and PWA: How the service worker caches the app, engines and models, how updates work and how to clear data.
Open with and share target: Open files from your system with OpenFile and send files to it from the share sheet.
Local AI: Which AI models run on your device, their sizes, first-run downloads, WebGPU or CPU, cancelling and privacy.
Privacy and security: No uploads, how to verify it yourself in the DevTools network tab, headers and what is stored locally.
Formats supported: A searchable matrix of every input and output format, generated from the tool registry.
Full tools reference: Every tool with its description, formats and link, generated from the registry. Filter and search.
Troubleshooting: Large files, memory, browser support, Safari quirks, unsigned app warnings and quick fixes.
Developer guide: Architecture, adding a tool, batch files, tests, builds, Pages and Vercel base paths and releasing the apps.
Roadmap: What has shipped and what comes next, generated from the project roadmap.
Data: Guide to every Data tool: csv, excel, json, sqlite, parquet, maps and gps.
AI: Guide to every AI tool: on-device ai for images, text and documents.
3D: Guide to every 3D tool: view and convert glb, gltf, obj, stl, ply and more.
Archives: Guide to every Archives tool: open and create zip, 7z, tar, gz and rar.
eBooks: Guide to every eBooks tool: read and convert epub, mobi, fb2 and comics.
Fonts: Guide to every Fonts tool: convert, inspect and subset ttf, otf, woff.
CAD: Guide to every CAD tool: view and convert dxf and other drawings.
Subtitles: Guide to every Subtitles tool: convert, sync and edit srt, vtt, ass.
Security & Privacy: Guide to every Security & Privacy tool: scrub metadata, lock files, hide messages, redact personal data.
Maps & GPS: Guide to every Maps & GPS tool: gpx elevation, splits, heatmaps, privacy zones and location codes.
Office & Sheets: Guide to every Office & Sheets tool: merge, split, compare and pivot spreadsheets, clean word files.
Science & Education: Guide to every Science & Education tool: equations, graphs, chemistry, matrices, logic and primes.
Creator Studio: Guide to every Creator Studio tool: audiograms, vertical video, carousels, word clouds and chapters.

Tools

Audio Editor & Trimmer: Trim, fade in/out, change volume and export with a waveform.
Audio Converter: Convert MP3, WAV, OGG, AAC, FLAC and M4A.
Voice Recorder: Record your voice with live waveform and export.
Audio Transcriber: Transcribe speech with on-device Whisper AI and export SRT.
Text to Speech: Read text aloud with system voices or a private neural voice, then save it as WAV.
Audio Merger: Join multiple audio files into one track.
Audio Speed and Pitch: Change speed without changing pitch, or shift pitch by semitones without changing speed.
Volume Booster and Normalizer: Make quiet audio or video louder, or even out loudness to a standard level (EBU R128).
Noise Reduction: Remove hiss, fan noise, hum and rumble from voice recordings and video sound.
Audio Tag Editor: Edit title, artist, album, year, genre, lyrics and cover art in MP3, M4A, FLAC and OGG files.
Ringtone Maker: Cut the best part of a song, add fades and save an iPhone M4R or an Android MP3 ringtone.
Reverse Audio: Play any sound backwards. Videos are reversed too.
Equalizer and Bass Boost: 10-band equalizer with bass boost, vocal and treble presets and a live preview.
Remove Silence: Cut silent parts and long pauses from audio or video automatically (jump cuts).
Audio Mixer: Layer tracks with their own volume, start time, pan and fades, then export one mix.
Split Audio: Split audio into equal parts, fixed lengths, at chosen times, or wherever there is silence.
Waveform and Spectrogram Image: Turn audio into waveform art or a spectrogram, as PNG or SVG.
MIDI Player and Converter: Play MIDI files, see the notes, mute tracks and render them to MP3 or WAV.
Audio to Video Visualizer: Turn a song or podcast clip into an MP4 with cover art and a moving waveform or spectrum.
PDF to Speech: Read PDFs, Word files and e-books aloud with natural AI voices and save an audiobook file.
Vocal Remover (Karaoke): Make a karaoke version of a stereo song and get a rough vocal track, right in your browser.