Free tools. No sign-up. Nothing uploaded.
A growing collection of handy online tools that run entirely in your browser — PDF, calculators, developer utilities, images and more. Free, private and open source: your data never leaves your device.
Free tools, ready in a click
All the tools
No tools found. Try a different search or category.
Guides
Practical write-ups on the problems these tools solve — useful even if you never open the tool.
How to Compress a PDF Without Uploading It
Why your PDF is large, which compression strategy to pick, and how to keep a sensitive document off someone else's server.
Read the guide →Subnet Masks and CIDR, Explained
What a mask actually does, how to read CIDR notation, and how to work out a subnet by hand.
Read the guide →CMYK vs RGB: Why Print Looks Different
Why the screen and the press disagree, how rendering intents change the result, and a pre-export checklist.
Read the guide →Choosing an Image Format: JPEG, PNG, WebP or AVIF
The old JPEG-versus-PNG rule is out of date. What to reach for now, and one thing never to do.
Read the guide →Why ProjectBay?
Private by design
Every tool runs in your browser. Files and data are processed locally — nothing is uploaded, tracked or sold.
Dead simple
One obvious action per screen, no accounts, no paywalls. Open a tool and it just works.
Nothing leaves your device
Every tool processes your files locally in the browser — documents, images and data are never uploaded to a server.
Always growing
New tools are added regularly — check back often to see what's new.