Privacy by Design
Local-first architecture means your data never leaves your browser.
Making file uploads effortless for everyone, everywhere.
FileThrough was born from a simple frustration: uploading files to different platforms shouldn't require a degree in file formats and compression settings.
Whether you're a developer pushing to GitHub, a designer sharing mockups on Figma, a marketer uploading assets to LinkedIn, or just someone trying to attach a photo to an email — you've probably hit file size limits, format restrictions, or dimension requirements that force you to open a separate tool, resize, convert, compress, and try again.
We built FileThrough to eliminate that friction entirely. It runs locally in your browser, detects upload constraints automatically, and prepares your files to meet them — all before you hit "Submit."
Your files never leave your device. FileThrough processes everything locally using WebAssembly and modern browser APIs. No uploads, no cloud processing, no data collection. What you upload stays yours.
We believe in transparency. FileThrough is open source under the MIT license. You can audit the code, contribute improvements, or self-host if you prefer.
Local-first architecture means your data never leaves your browser.
Works automatically — no settings to tweak, no rules to write.
WebAssembly-powered processing completes in milliseconds.
Open source development shaped by real user feedback.
Join thousands of users who never worry about file size limits again
Install FileThrough Free