String Tension
Get a free API key + new tools as they ship
100 calls/day, no card, no spam. Built by one person, in public.
About Str Tension
Working with this task no longer requires installing heavy desktop software — Str Tension runs entirely in your browser, instantly. Processing runs locally in your browser using modern Web APIs. Nothing is uploaded, nothing is logged, and there is no quota to worry about for casual use. If you find yourself doing this regularly, the rest of the utility suite covers most adjacent tasks with the same approach.
When you'd reach for Str Tension
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'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.
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.
Frequently asked about Str Tension
- Will Str Tension change my original file?
- Never. Str Tension only reads your input file and produces a new output file.
- Is Str Tension really free?
- Yes — Str Tension is free for unlimited personal use, with no account required and no watermark on the output.
- Does Str Tension work on mobile?
- Yes, Str Tension is fully responsive and tested on iOS Safari and Android Chrome.
- Do I need to create an account to use Str Tension?
- No. Str Tension works without any signup. We only ask for an email if you decide to subscribe to a paid plan.
- What browsers does Str Tension support?
- Every modern browser released in the last three years: Chrome, Firefox, Safari, Edge, Brave, Opera.
