Browser-side encrypted file uploads
After developing a client-side encryption plugin for the Uppy uploader (https://github.com/0sumcode/uppy-encrypt), I created a proof of concept web app that encrypts files before upload (and decrypts them after download). There are other solutions like this, but I wanted one that was simple, fast, and open-source (https://github.com/0sumcode/0up) so others can adapt it for any projects that could benefit from it. I hope some folks find the service and/or code helpful!
Browser-side encrypted file uploads launched on January 11, 2024 with 5 votes and more than 50% of that year's launches. The site was still online in September 2026, 2 years on.
What it does
0up is a free, open-source, encrypted file sharing service.
No. The key required for decryption is never sent to 0up , meaning we have no ability to decrypt your uploads. Your file's meta data (file name, file type, etc) are also encrypted. Your files are encrypted by your web browser, with a key that is generated on your browser. The key is never sent to 0up , meaning only you and those you share the link with can download the decrypted files. Your keys are passed as an anchor component in the URL (#YOUR_KEY_HERE). The anchor data is not sent as part of the request to the server and isn't logged by the server. While that doesn't mean it's impossible for nefarious or bad code to leak the key, we're open source and encourage you to check our work! We…from 0up.io
Does a similar job
all alternatives →- EAEncrypt and upload files to IPFS from browser2023 · thirdcloud.org · ▲73
Hi HN, I'm building ThirdCloud with the goal to replace Google Drive for everyone: more private, cheaper & maybe better UI/UX. So far, I've successfully implemented the main feature, which involves uploading and downloading files. Files are encrypted before being sent to IPFS network. Would like to hear your thoughts on this proof of concept.
Send Files Encrypted2023 · sendfilesencrypted.com · ▲68Send encrypted files in your browser and share them securely
just f***ing send itJun 2026 · jfsendit.com · ▲155Send any file, any size, straight from browser to browser
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