The best free tools, honestly compared.
We tested every popular online tool so you do not have to. Side-by-side scores, real verdicts, no affiliate kickbacks.
Best free concrete calculators for DIY projects (2026)
Five concrete calculators tested on slabs, footings, and round columns. Only two get bag counts right.
Best free mortgage calculators in 2026 (Bankrate, NerdWallet, Zillow, ToolHub)
We ran a $400K mortgage through five popular calculators. Two left out taxes and insurance.
Best free BMI calculators compared (CDC, NIH, NHS, and more)
We checked six BMI calculators against the WHO formula. Some round differently and one is wrong.
Best free unit converters compared (2026)
Google's calculator, OnlineConversion, ConvertWorld, RapidTables, and ToolHub head-to-head.
Best Markdown to HTML converters compared (2026)
We tested six free Markdown converters. Here is which one to use, and why.
Best JWT decoders compared (privacy-safe vs upload-and-pray)
Most online JWT decoders upload your token to a server. We tested the alternatives.
Best free QR code generators (no watermark, no expiry)
Most free QR generators add tracking or expire your codes. These six do not.
Best free image compressors compared (2026)
We compressed the same images with 6 different tools. Here is what we found.
SmallPDF alternatives: 5 free PDF toolkits compared
SmallPDF is paywalled after a few uses per day. Here are five honest alternatives.
TinyPNG alternatives that respect your privacy
Six free image compressors compared. Most upload your files; only one does not.
Best free PDF mergers in 2026 (no signup, no upload)
We tested the top 6 free PDF mergers. Here is which one to use, and why.