The ConvertProKit Blog
In-depth, practical guides on PDF tools, image conversion, compression, editing and productivity — all powered by free tools that run in your browser.
PDF Tools
Best Free PDF Tools in 2026, Compared for Privacy, Speed and Features
Most "best free PDF tools" lists compare features and skip the one question that actually matters: does the tool upload your file to a server first?
Productivity
JWT Decoder: How to Read and Debug a JSON Web Token
Decoding a JWT shows you exactly what it contains — but decoding is not the same as verifying it is genuine, and that distinction matters a lot.
Productivity
Free Hash Generator: What MD5, SHA-1 and SHA-256 Actually Do
A hash is a one-way fingerprint of data — the same input always produces the same hash, but the hash can never be reversed back into the original input.
Converters & QR
Binary, Hex and Decimal Numbers Explained (And How to Convert Between Them)
Binary, decimal and hexadecimal are all just different bases for counting the same quantities — hex exists mainly to make binary easier for humans to read.
Converters & QR
Base64 Encoding Explained: How to Encode and Decode Text or Data
Base64 is not encryption and does not compress anything — it exists purely to make binary data safe to carry in text-only formats.
Productivity
VAT Calculator: How to Add or Remove VAT From a Price
Adding VAT to a price and removing VAT from a price use two different formulas — dividing by the same percentage you multiplied by does not reverse it correctly.
Productivity
Tip Calculator: How Much to Tip and How to Split a Bill Fairly
Splitting a bill and tip between a group correctly involves more steps than dividing the total by the number of people.
Productivity
How to Calculate Percentage, Percentage Change and Percentage Difference
"Percentage of," "percentage change" and "percentage difference" are three different calculations that get mixed up constantly.
Productivity
How to Calculate a Discount and Final Sale Price Instantly
A 30% discount followed by another 20% off is not the same as 50% off — here is how discount math actually works.
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