Supabus — Free Online Calculators, Converters & PDF Tools
Free online tools for everyday tasks - unit converters, calculators, PDF and image editing, text tools, and YouTube utilities. Fast, accurate, and no sign-up required.
Popular tools
The tools people reach for most.
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Common workflows
Chain two tools together to get a task done in one visit.
Shrink an image for the web
Resize a photo to the exact dimensions you need, then compress it further to shave off extra kilobytes before uploading.
Combine and shrink PDFs
Merge multiple PDFs into a single file, then compress the result so it's easier to email or upload.
Convert a price, then work out a loan
Convert an amount into your own currency, then estimate the monthly payments on a loan for it.
Your files aren't stored
Every file you upload is processed to produce your result and is not retained afterward - nothing sits around on a server once you've downloaded your output. Read the full Privacy Policy for the details.
Why Supabus
- • No account required - every tool works instantly.
- • Files are processed transiently and are never stored.
- • Available in English, Spanish, German, and French.
- • Runs entirely in your browser - nothing to install.
Recently updated guides
PDF Compression: What It Can (and Can't) Do Yet
How PDF compression actually reduces file size, why image-heavy PDFs are the hardest case, and an honest limitation in our own compressor today.
Published July 26, 2026
What Actually Happens When You Refinance a Mortgage
How mortgage refinance break-even and lifetime savings are actually calculated, and the costs a quick estimate usually leaves out.
Published July 26, 2026
Margin vs. Markup: The Difference That Trips Everyone Up
Margin and markup use the same profit but divide by different numbers - here's the actual formulas, a worked example, and why they're easy to mix up.
Published July 26, 2026
Questions or feedback?
Supabus is an independently run project. If something's broken or you have an idea for a new tool, we'd like to hear about it.