Shelf Sag Calc
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100 calls/day, no card, no spam. Built by one person, in public.
About Shelf Sag
Shelf Sag was built for the moment you just need to handle this task and move on — no signup, no upload to a third-party server. Everything happens client-side, which means your files and data never leave your machine. The interface is intentionally minimal so you can focus on the task instead of learning the tool. 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 Shelf Sag
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 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 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 Shelf Sag
- Does Shelf Sag work on mobile?
- Yes, Shelf Sag is fully responsive and tested on iOS Safari and Android Chrome.
- Is Shelf Sag really free?
- Yes — Shelf Sag is free for unlimited personal use, with no account required and no watermark on the output.
- Can I use Shelf Sag commercially?
- Yes. The output of Shelf Sag belongs entirely to you, with no licensing restrictions.
- Will Shelf Sag change my original file?
- Never. Shelf Sag only reads your input file and produces a new output file.
- What browsers does Shelf Sag support?
- Every modern browser released in the last three years: Chrome, Firefox, Safari, Edge, Brave, Opera.