Bandwidth-Delay Product: 5,000,000 bits
Optimal Window: 610.4 KB (625,000 bytes)
Window scaling required (>64 KB)
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100 calls/day, no card, no spam. Built by one person, in public.
About TCP Window
When you need developer and design work done in seconds, TCP Window delivers a clean, focused interface without the friction of a generic tool. The goal was to keep the path from "open the page" to "get the result" as short as possible. No mandatory account, no cookie wall, no upsell at every step. Like everything else in the developer collection, it is free, ad-light, and works on mobile as well as desktop.
When you'd reach for TCP Window
You're on a public or shared machine and don't want to leave traces of what you're working on.
Travelers, contractors, anyone working from a friend's computer.
Nothing is uploaded, nothing persists if you're not signed in.
You need to handle a one-off task right before a meeting and don't have time to install anything.
Anyone working remotely on a borrowed or restricted machine.
Open the page, get the result, paste it into your doc — under a minute.
You're hitting the daily limit of a paid SaaS and need a backup option for a single quick job.
Marketers and ops people whose primary tool is metered.
Stay productive without burning credits.
You're cleaning up a folder of files that accumulated over a project and need to standardize them.
Designers, writers, and developers wrapping up deliverables.
Drop each file in, copy the output, move on.
Frequently asked about TCP Window
- Is TCP Window really free?
- Yes — TCP Window is free for unlimited personal use, with no account required and no watermark on the output.
- Are my files uploaded to a server when I use TCP Window?
- TCP Window processes everything in your browser using local APIs. Your files never leave your device.
- Will TCP Window change my original file?
- Never. TCP Window only reads your input file and produces a new output file.
- Does TCP Window work on mobile?
- Yes, TCP Window is fully responsive and tested on iOS Safari and Android Chrome.
- Can I use TCP Window commercially?
- Yes. The output of TCP Window belongs entirely to you, with no licensing restrictions.