Bit BridgeEvery file format.
One private app.
Bit Bridge converts images, video, audio, documents, and archives — entirely on your Mac. No cloud, no uploads, no account. Turn off Wi-Fi and it still works, because nothing is ever sent anywhere.
Formats
Five kinds of files. 150+ conversions.
Images, video, audio, documents, and archives — Bit Bridge speaks them all, using the same native engines as macOS itself.
Images
Plus WebP & HEIF import. Quality and resize controls built in.
Video
Plus AVI & WebM import, and extract the audio track to a file.
Audio
Plus MP3 import. Choose bitrate for compressed output.
Documents
Plus EPUB export. Markdown keeps headings, bold, italic & code.
Archives
Pack and unpack, with a pure-Swift engine and no dependencies.
…and counting
Over 150 source → target conversions, each verified to produce a correct, valid file. More formats are on the way.
Features
Fast, native, and entirely yours.
Built on Apple's own frameworks — ImageIO, AVFoundation, PDFKit, and WebKit — with zero third-party dependencies and zero network access.
100% on-device
Every conversion runs locally. Nothing is uploaded, nothing is logged — it works exactly the same with Wi-Fi off.
Convert hundreds at once
Drop in a whole batch of files at once. Bit Bridge converts them in parallel and tells you the moment it's done.
Native & fast
No Electron, no bundled binaries, no bloat — just a tiny, sandboxed Mac app using the system's own codecs.
Drop it anywhere
Drag files onto the window from anywhere on your Mac, pick a target format inline, and convert.
Light & dark
A clean, modern interface that follows your Mac's appearance — and looks great in both.
Private by design
Fully App-Sandboxed and listed as Data Not Collected. Bit Bridge has no account and no analytics.
How it works
Drop a file, pick a format, done.
Drop your files
Drag anything onto Bit Bridge, or browse by type. They're sorted into clean image, video, audio, document, and archive groups.
Pick a format
Each file shows its current format and an arrow to the target. Choose where it should go from a tidy menu of options.
Convert
Hit Convert All. Output lands in the folder you choose, ready to use — with a notification when the batch finishes.
Screenshots
Designed to feel at home on macOS.
A focused, single-window app that gets out of your way.
Nothing leaves your Mac.
Bit Bridge collects nothing and sends nothing. There's no account, no analytics, and no network connection at all — your files are converted on your own machine and stay there. Read the full privacy policy.
FAQ
Quick answers.
Is Bit Bridge really offline?
Yes. Bit Bridge makes no network requests whatsoever. You can turn off Wi-Fi, unplug ethernet, and every conversion still works — because all of it happens on your Mac using Apple's built-in frameworks.
What can it convert?
Images (PNG, JPEG, TIFF, BMP, HEIC, AVIF, ICO, GIF), video (MP4, MOV, M4V), audio (AAC, M4A, ALAC, WAV, AIFF), documents (TXT, Markdown, HTML, RTF, DOCX, PDF) and archives (ZIP, TAR, GZIP) — over 150 conversions in total.
Why are some formats import-only?
macOS can read certain formats but has no built-in encoder for them, so Bit Bridge accepts WebP, HEIF, AVI, WebM and MP3 as inputs and converts them to a fully supported format. EPUB is export-only. The in-app conversions guide spells out exactly what goes where.
How much does it cost?
Bit Bridge is free.
Which Macs does it run on?
Any Mac running macOS 14 Sonoma or later, on both Apple silicon and Intel.
What data does Bit Bridge collect about me?
None. There is no account, no tracking and no analytics. Its App Store privacy label is Data Not Collected.
Support
We're happy to help.
Contact
Questions, a bug, or a format you'd love to see?
Email jadbader7@gmail.com — we usually reply within a few days.